linux/drivers/gpu/drm/drm_fb_helper.c
Hugh Dickins d68752cf7b drm: avoid switching to text console if there is no panic timeout
Add a check for panic_timeout in the drm_fb_helper_panic() notifier: if
we're going to reboot immediately, the user will not be able to see the
messages anyway, and messing with the video mode may display artifacts,
and certainly get into several layers of complexity (including mutexes and
memory allocations) which we shall be much safer to avoid.

Signed-off-by: Hugh Dickins <hughd@google.com>
[ Edited commit message and modified to short-circuit panic_timeout < 0
  instead of testing panic_timeout >= 0.  -Mandeep ]
Signed-off-by: Mandeep Singh Baines <msb@chromium.org>
Acked-by: David Rientjes <rientjes@google.com>
Acked-by: Stéphane Marchesin <marcheu@chromium.org>
Signed-off-by: Dave Airlie <airlied@redhat.com>
2011-11-10 21:27:34 +00:00

1465 lines
39 KiB
C

/*
* Copyright (c) 2006-2009 Red Hat Inc.
* Copyright (c) 2006-2008 Intel Corporation
* Copyright (c) 2007 Dave Airlie <airlied@linux.ie>
*
* DRM framebuffer helper functions
*
* Permission to use, copy, modify, distribute, and sell this software and its
* documentation for any purpose is hereby granted without fee, provided that
* the above copyright notice appear in all copies and that both that copyright
* notice and this permission notice appear in supporting documentation, and
* that the name of the copyright holders not be used in advertising or
* publicity pertaining to distribution of the software without specific,
* written prior permission. The copyright holders make no representations
* about the suitability of this software for any purpose. It is provided "as
* is" without express or implied warranty.
*
* THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
* INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
* EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY SPECIAL, INDIRECT OR
* CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
* DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
* TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
* OF THIS SOFTWARE.
*
* Authors:
* Dave Airlie <airlied@linux.ie>
* Jesse Barnes <jesse.barnes@intel.com>
*/
#include <linux/kernel.h>
#include <linux/sysrq.h>
#include <linux/slab.h>
#include <linux/fb.h>
#include <linux/module.h>
#include "drmP.h"
#include "drm_crtc.h"
#include "drm_fb_helper.h"
#include "drm_crtc_helper.h"
MODULE_AUTHOR("David Airlie, Jesse Barnes");
MODULE_DESCRIPTION("DRM KMS helper");
MODULE_LICENSE("GPL and additional rights");
static LIST_HEAD(kernel_fb_helper_list);
/* simple single crtc case helper function */
int drm_fb_helper_single_add_all_connectors(struct drm_fb_helper *fb_helper)
{
struct drm_device *dev = fb_helper->dev;
struct drm_connector *connector;
int i;
list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
struct drm_fb_helper_connector *fb_helper_connector;
fb_helper_connector = kzalloc(sizeof(struct drm_fb_helper_connector), GFP_KERNEL);
if (!fb_helper_connector)
goto fail;
fb_helper_connector->connector = connector;
fb_helper->connector_info[fb_helper->connector_count++] = fb_helper_connector;
}
return 0;
fail:
for (i = 0; i < fb_helper->connector_count; i++) {
kfree(fb_helper->connector_info[i]);
fb_helper->connector_info[i] = NULL;
}
fb_helper->connector_count = 0;
return -ENOMEM;
}
EXPORT_SYMBOL(drm_fb_helper_single_add_all_connectors);
static int drm_fb_helper_parse_command_line(struct drm_fb_helper *fb_helper)
{
struct drm_fb_helper_connector *fb_helper_conn;
int i;
for (i = 0; i < fb_helper->connector_count; i++) {
struct drm_cmdline_mode *mode;
struct drm_connector *connector;
char *option = NULL;
fb_helper_conn = fb_helper->connector_info[i];
connector = fb_helper_conn->connector;
mode = &fb_helper_conn->cmdline_mode;
/* do something on return - turn off connector maybe */
if (fb_get_options(drm_get_connector_name(connector), &option))
continue;
if (drm_mode_parse_command_line_for_connector(option,
connector,
mode)) {
if (mode->force) {
const char *s;
switch (mode->force) {
case DRM_FORCE_OFF: s = "OFF"; break;
case DRM_FORCE_ON_DIGITAL: s = "ON - dig"; break;
default:
case DRM_FORCE_ON: s = "ON"; break;
}
DRM_INFO("forcing %s connector %s\n",
drm_get_connector_name(connector), s);
connector->force = mode->force;
}
DRM_DEBUG_KMS("cmdline mode for connector %s %dx%d@%dHz%s%s%s\n",
drm_get_connector_name(connector),
mode->xres, mode->yres,
mode->refresh_specified ? mode->refresh : 60,
mode->rb ? " reduced blanking" : "",
mode->margins ? " with margins" : "",
mode->interlace ? " interlaced" : "");
}
}
return 0;
}
static void drm_fb_helper_save_lut_atomic(struct drm_crtc *crtc, struct drm_fb_helper *helper)
{
uint16_t *r_base, *g_base, *b_base;
int i;
r_base = crtc->gamma_store;
g_base = r_base + crtc->gamma_size;
b_base = g_base + crtc->gamma_size;
for (i = 0; i < crtc->gamma_size; i++)
helper->funcs->gamma_get(crtc, &r_base[i], &g_base[i], &b_base[i], i);
}
static void drm_fb_helper_restore_lut_atomic(struct drm_crtc *crtc)
{
uint16_t *r_base, *g_base, *b_base;
r_base = crtc->gamma_store;
g_base = r_base + crtc->gamma_size;
b_base = g_base + crtc->gamma_size;
crtc->funcs->gamma_set(crtc, r_base, g_base, b_base, 0, crtc->gamma_size);
}
int drm_fb_helper_debug_enter(struct fb_info *info)
{
struct drm_fb_helper *helper = info->par;
struct drm_crtc_helper_funcs *funcs;
int i;
if (list_empty(&kernel_fb_helper_list))
return false;
list_for_each_entry(helper, &kernel_fb_helper_list, kernel_fb_list) {
for (i = 0; i < helper->crtc_count; i++) {
struct drm_mode_set *mode_set =
&helper->crtc_info[i].mode_set;
if (!mode_set->crtc->enabled)
continue;
funcs = mode_set->crtc->helper_private;
drm_fb_helper_save_lut_atomic(mode_set->crtc, helper);
funcs->mode_set_base_atomic(mode_set->crtc,
mode_set->fb,
mode_set->x,
mode_set->y,
ENTER_ATOMIC_MODE_SET);
}
}
return 0;
}
EXPORT_SYMBOL(drm_fb_helper_debug_enter);
/* Find the real fb for a given fb helper CRTC */
static struct drm_framebuffer *drm_mode_config_fb(struct drm_crtc *crtc)
{
struct drm_device *dev = crtc->dev;
struct drm_crtc *c;
list_for_each_entry(c, &dev->mode_config.crtc_list, head) {
if (crtc->base.id == c->base.id)
return c->fb;
}
return NULL;
}
int drm_fb_helper_debug_leave(struct fb_info *info)
{
struct drm_fb_helper *helper = info->par;
struct drm_crtc *crtc;
struct drm_crtc_helper_funcs *funcs;
struct drm_framebuffer *fb;
int i;
for (i = 0; i < helper->crtc_count; i++) {
struct drm_mode_set *mode_set = &helper->crtc_info[i].mode_set;
crtc = mode_set->crtc;
funcs = crtc->helper_private;
fb = drm_mode_config_fb(crtc);
if (!crtc->enabled)
continue;
if (!fb) {
DRM_ERROR("no fb to restore??\n");
continue;
}
drm_fb_helper_restore_lut_atomic(mode_set->crtc);
funcs->mode_set_base_atomic(mode_set->crtc, fb, crtc->x,
crtc->y, LEAVE_ATOMIC_MODE_SET);
}
return 0;
}
EXPORT_SYMBOL(drm_fb_helper_debug_leave);
bool drm_fb_helper_restore_fbdev_mode(struct drm_fb_helper *fb_helper)
{
bool error = false;
int i, ret;
for (i = 0; i < fb_helper->crtc_count; i++) {
struct drm_mode_set *mode_set = &fb_helper->crtc_info[i].mode_set;
ret = drm_crtc_helper_set_config(mode_set);
if (ret)
error = true;
}
return error;
}
EXPORT_SYMBOL(drm_fb_helper_restore_fbdev_mode);
bool drm_fb_helper_force_kernel_mode(void)
{
bool ret, error = false;
struct drm_fb_helper *helper;
if (list_empty(&kernel_fb_helper_list))
return false;
list_for_each_entry(helper, &kernel_fb_helper_list, kernel_fb_list) {
if (helper->dev->switch_power_state == DRM_SWITCH_POWER_OFF)
continue;
ret = drm_fb_helper_restore_fbdev_mode(helper);
if (ret)
error = true;
}
return error;
}
int drm_fb_helper_panic(struct notifier_block *n, unsigned long ununsed,
void *panic_str)
{
/*
* It's a waste of time and effort to switch back to text console
* if the kernel should reboot before panic messages can be seen.
*/
if (panic_timeout < 0)
return 0;
printk(KERN_ERR "panic occurred, switching back to text console\n");
return drm_fb_helper_force_kernel_mode();
}
EXPORT_SYMBOL(drm_fb_helper_panic);
static struct notifier_block paniced = {
.notifier_call = drm_fb_helper_panic,
};
/**
* drm_fb_helper_restore - restore the framebuffer console (kernel) config
*
* Restore's the kernel's fbcon mode, used for lastclose & panic paths.
*/
void drm_fb_helper_restore(void)
{
bool ret;
ret = drm_fb_helper_force_kernel_mode();
if (ret == true)
DRM_ERROR("Failed to restore crtc configuration\n");
}
EXPORT_SYMBOL(drm_fb_helper_restore);
#ifdef CONFIG_MAGIC_SYSRQ
static void drm_fb_helper_restore_work_fn(struct work_struct *ignored)
{
drm_fb_helper_restore();
}
static DECLARE_WORK(drm_fb_helper_restore_work, drm_fb_helper_restore_work_fn);
static void drm_fb_helper_sysrq(int dummy1)
{
schedule_work(&drm_fb_helper_restore_work);
}
static struct sysrq_key_op sysrq_drm_fb_helper_restore_op = {
.handler = drm_fb_helper_sysrq,
.help_msg = "force-fb(V)",
.action_msg = "Restore framebuffer console",
};
#else
static struct sysrq_key_op sysrq_drm_fb_helper_restore_op = { };
#endif
static void drm_fb_helper_on(struct fb_info *info)
{
struct drm_fb_helper *fb_helper = info->par;
struct drm_device *dev = fb_helper->dev;
struct drm_crtc *crtc;
struct drm_crtc_helper_funcs *crtc_funcs;
struct drm_connector *connector;
struct drm_encoder *encoder;
int i, j;
/*
* For each CRTC in this fb, turn the crtc on then,
* find all associated encoders and turn them on.
*/
mutex_lock(&dev->mode_config.mutex);
for (i = 0; i < fb_helper->crtc_count; i++) {
crtc = fb_helper->crtc_info[i].mode_set.crtc;
crtc_funcs = crtc->helper_private;
if (!crtc->enabled)
continue;
crtc_funcs->dpms(crtc, DRM_MODE_DPMS_ON);
/* Walk the connectors & encoders on this fb turning them on */
for (j = 0; j < fb_helper->connector_count; j++) {
connector = fb_helper->connector_info[j]->connector;
connector->dpms = DRM_MODE_DPMS_ON;
drm_connector_property_set_value(connector,
dev->mode_config.dpms_property,
DRM_MODE_DPMS_ON);
}
/* Found a CRTC on this fb, now find encoders */
list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
if (encoder->crtc == crtc) {
struct drm_encoder_helper_funcs *encoder_funcs;
encoder_funcs = encoder->helper_private;
encoder_funcs->dpms(encoder, DRM_MODE_DPMS_ON);
}
}
}
mutex_unlock(&dev->mode_config.mutex);
}
static void drm_fb_helper_off(struct fb_info *info, int dpms_mode)
{
struct drm_fb_helper *fb_helper = info->par;
struct drm_device *dev = fb_helper->dev;
struct drm_crtc *crtc;
struct drm_crtc_helper_funcs *crtc_funcs;
struct drm_connector *connector;
struct drm_encoder *encoder;
int i, j;
/*
* For each CRTC in this fb, find all associated encoders
* and turn them off, then turn off the CRTC.
*/
mutex_lock(&dev->mode_config.mutex);
for (i = 0; i < fb_helper->crtc_count; i++) {
crtc = fb_helper->crtc_info[i].mode_set.crtc;
crtc_funcs = crtc->helper_private;
if (!crtc->enabled)
continue;
/* Walk the connectors on this fb and mark them off */
for (j = 0; j < fb_helper->connector_count; j++) {
connector = fb_helper->connector_info[j]->connector;
connector->dpms = dpms_mode;
drm_connector_property_set_value(connector,
dev->mode_config.dpms_property,
dpms_mode);
}
/* Found a CRTC on this fb, now find encoders */
list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
if (encoder->crtc == crtc) {
struct drm_encoder_helper_funcs *encoder_funcs;
encoder_funcs = encoder->helper_private;
encoder_funcs->dpms(encoder, dpms_mode);
}
}
crtc_funcs->dpms(crtc, DRM_MODE_DPMS_OFF);
}
mutex_unlock(&dev->mode_config.mutex);
}
int drm_fb_helper_blank(int blank, struct fb_info *info)
{
switch (blank) {
/* Display: On; HSync: On, VSync: On */
case FB_BLANK_UNBLANK:
drm_fb_helper_on(info);
break;
/* Display: Off; HSync: On, VSync: On */
case FB_BLANK_NORMAL:
drm_fb_helper_off(info, DRM_MODE_DPMS_STANDBY);
break;
/* Display: Off; HSync: Off, VSync: On */
case FB_BLANK_HSYNC_SUSPEND:
drm_fb_helper_off(info, DRM_MODE_DPMS_STANDBY);
break;
/* Display: Off; HSync: On, VSync: Off */
case FB_BLANK_VSYNC_SUSPEND:
drm_fb_helper_off(info, DRM_MODE_DPMS_SUSPEND);
break;
/* Display: Off; HSync: Off, VSync: Off */
case FB_BLANK_POWERDOWN:
drm_fb_helper_off(info, DRM_MODE_DPMS_OFF);
break;
}
return 0;
}
EXPORT_SYMBOL(drm_fb_helper_blank);
static void drm_fb_helper_crtc_free(struct drm_fb_helper *helper)
{
int i;
for (i = 0; i < helper->connector_count; i++)
kfree(helper->connector_info[i]);
kfree(helper->connector_info);
for (i = 0; i < helper->crtc_count; i++)
kfree(helper->crtc_info[i].mode_set.connectors);
kfree(helper->crtc_info);
}
int drm_fb_helper_init(struct drm_device *dev,
struct drm_fb_helper *fb_helper,
int crtc_count, int max_conn_count)
{
struct drm_crtc *crtc;
int ret = 0;
int i;
fb_helper->dev = dev;
INIT_LIST_HEAD(&fb_helper->kernel_fb_list);
fb_helper->crtc_info = kcalloc(crtc_count, sizeof(struct drm_fb_helper_crtc), GFP_KERNEL);
if (!fb_helper->crtc_info)
return -ENOMEM;
fb_helper->crtc_count = crtc_count;
fb_helper->connector_info = kcalloc(dev->mode_config.num_connector, sizeof(struct drm_fb_helper_connector *), GFP_KERNEL);
if (!fb_helper->connector_info) {
kfree(fb_helper->crtc_info);
return -ENOMEM;
}
fb_helper->connector_count = 0;
for (i = 0; i < crtc_count; i++) {
fb_helper->crtc_info[i].mode_set.connectors =
kcalloc(max_conn_count,
sizeof(struct drm_connector *),
GFP_KERNEL);
if (!fb_helper->crtc_info[i].mode_set.connectors) {
ret = -ENOMEM;
goto out_free;
}
fb_helper->crtc_info[i].mode_set.num_connectors = 0;
}
i = 0;
list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
fb_helper->crtc_info[i].crtc_id = crtc->base.id;
fb_helper->crtc_info[i].mode_set.crtc = crtc;
i++;
}
fb_helper->conn_limit = max_conn_count;
return 0;
out_free:
drm_fb_helper_crtc_free(fb_helper);
return -ENOMEM;
}
EXPORT_SYMBOL(drm_fb_helper_init);
void drm_fb_helper_fini(struct drm_fb_helper *fb_helper)
{
if (!list_empty(&fb_helper->kernel_fb_list)) {
list_del(&fb_helper->kernel_fb_list);
if (list_empty(&kernel_fb_helper_list)) {
printk(KERN_INFO "drm: unregistered panic notifier\n");
atomic_notifier_chain_unregister(&panic_notifier_list,
&paniced);
unregister_sysrq_key('v', &sysrq_drm_fb_helper_restore_op);
}
}
drm_fb_helper_crtc_free(fb_helper);
}
EXPORT_SYMBOL(drm_fb_helper_fini);
static int setcolreg(struct drm_crtc *crtc, u16 red, u16 green,
u16 blue, u16 regno, struct fb_info *info)
{
struct drm_fb_helper *fb_helper = info->par;
struct drm_framebuffer *fb = fb_helper->fb;
int pindex;
if (info->fix.visual == FB_VISUAL_TRUECOLOR) {
u32 *palette;
u32 value;
/* place color in psuedopalette */
if (regno > 16)
return -EINVAL;
palette = (u32 *)info->pseudo_palette;
red >>= (16 - info->var.red.length);
green >>= (16 - info->var.green.length);
blue >>= (16 - info->var.blue.length);
value = (red << info->var.red.offset) |
(green << info->var.green.offset) |
(blue << info->var.blue.offset);
if (info->var.transp.length > 0) {
u32 mask = (1 << info->var.transp.length) - 1;
mask <<= info->var.transp.offset;
value |= mask;
}
palette[regno] = value;
return 0;
}
pindex = regno;
if (fb->bits_per_pixel == 16) {
pindex = regno << 3;
if (fb->depth == 16 && regno > 63)
return -EINVAL;
if (fb->depth == 15 && regno > 31)
return -EINVAL;
if (fb->depth == 16) {
u16 r, g, b;
int i;
if (regno < 32) {
for (i = 0; i < 8; i++)
fb_helper->funcs->gamma_set(crtc, red,
green, blue, pindex + i);
}
fb_helper->funcs->gamma_get(crtc, &r,
&g, &b,
pindex >> 1);
for (i = 0; i < 4; i++)
fb_helper->funcs->gamma_set(crtc, r,
green, b,
(pindex >> 1) + i);
}
}
if (fb->depth != 16)
fb_helper->funcs->gamma_set(crtc, red, green, blue, pindex);
return 0;
}
int drm_fb_helper_setcmap(struct fb_cmap *cmap, struct fb_info *info)
{
struct drm_fb_helper *fb_helper = info->par;
struct drm_crtc_helper_funcs *crtc_funcs;
u16 *red, *green, *blue, *transp;
struct drm_crtc *crtc;
int i, j, rc = 0;
int start;
for (i = 0; i < fb_helper->crtc_count; i++) {
crtc = fb_helper->crtc_info[i].mode_set.crtc;
crtc_funcs = crtc->helper_private;
red = cmap->red;
green = cmap->green;
blue = cmap->blue;
transp = cmap->transp;
start = cmap->start;
for (j = 0; j < cmap->len; j++) {
u16 hred, hgreen, hblue, htransp = 0xffff;
hred = *red++;
hgreen = *green++;
hblue = *blue++;
if (transp)
htransp = *transp++;
rc = setcolreg(crtc, hred, hgreen, hblue, start++, info);
if (rc)
return rc;
}
crtc_funcs->load_lut(crtc);
}
return rc;
}
EXPORT_SYMBOL(drm_fb_helper_setcmap);
int drm_fb_helper_check_var(struct fb_var_screeninfo *var,
struct fb_info *info)
{
struct drm_fb_helper *fb_helper = info->par;
struct drm_framebuffer *fb = fb_helper->fb;
int depth;
if (var->pixclock != 0 || in_dbg_master())
return -EINVAL;
/* Need to resize the fb object !!! */
if (var->bits_per_pixel > fb->bits_per_pixel || var->xres > fb->width || var->yres > fb->height) {
DRM_DEBUG("fb userspace requested width/height/bpp is greater than current fb "
"object %dx%d-%d > %dx%d-%d\n", var->xres, var->yres, var->bits_per_pixel,
fb->width, fb->height, fb->bits_per_pixel);
return -EINVAL;
}
switch (var->bits_per_pixel) {
case 16:
depth = (var->green.length == 6) ? 16 : 15;
break;
case 32:
depth = (var->transp.length > 0) ? 32 : 24;
break;
default:
depth = var->bits_per_pixel;
break;
}
switch (depth) {
case 8:
var->red.offset = 0;
var->green.offset = 0;
var->blue.offset = 0;
var->red.length = 8;
var->green.length = 8;
var->blue.length = 8;
var->transp.length = 0;
var->transp.offset = 0;
break;
case 15:
var->red.offset = 10;
var->green.offset = 5;
var->blue.offset = 0;
var->red.length = 5;
var->green.length = 5;
var->blue.length = 5;
var->transp.length = 1;
var->transp.offset = 15;
break;
case 16:
var->red.offset = 11;
var->green.offset = 5;
var->blue.offset = 0;
var->red.length = 5;
var->green.length = 6;
var->blue.length = 5;
var->transp.length = 0;
var->transp.offset = 0;
break;
case 24:
var->red.offset = 16;
var->green.offset = 8;
var->blue.offset = 0;
var->red.length = 8;
var->green.length = 8;
var->blue.length = 8;
var->transp.length = 0;
var->transp.offset = 0;
break;
case 32:
var->red.offset = 16;
var->green.offset = 8;
var->blue.offset = 0;
var->red.length = 8;
var->green.length = 8;
var->blue.length = 8;
var->transp.length = 8;
var->transp.offset = 24;
break;
default:
return -EINVAL;
}
return 0;
}
EXPORT_SYMBOL(drm_fb_helper_check_var);
/* this will let fbcon do the mode init */
int drm_fb_helper_set_par(struct fb_info *info)
{
struct drm_fb_helper *fb_helper = info->par;
struct drm_device *dev = fb_helper->dev;
struct fb_var_screeninfo *var = &info->var;
struct drm_crtc *crtc;
int ret;
int i;
if (var->pixclock != 0) {
DRM_ERROR("PIXEL CLOCK SET\n");
return -EINVAL;
}
mutex_lock(&dev->mode_config.mutex);
for (i = 0; i < fb_helper->crtc_count; i++) {
crtc = fb_helper->crtc_info[i].mode_set.crtc;
ret = crtc->funcs->set_config(&fb_helper->crtc_info[i].mode_set);
if (ret) {
mutex_unlock(&dev->mode_config.mutex);
return ret;
}
}
mutex_unlock(&dev->mode_config.mutex);
if (fb_helper->delayed_hotplug) {
fb_helper->delayed_hotplug = false;
drm_fb_helper_hotplug_event(fb_helper);
}
return 0;
}
EXPORT_SYMBOL(drm_fb_helper_set_par);
int drm_fb_helper_pan_display(struct fb_var_screeninfo *var,
struct fb_info *info)
{
struct drm_fb_helper *fb_helper = info->par;
struct drm_device *dev = fb_helper->dev;
struct drm_mode_set *modeset;
struct drm_crtc *crtc;
int ret = 0;
int i;
mutex_lock(&dev->mode_config.mutex);
for (i = 0; i < fb_helper->crtc_count; i++) {
crtc = fb_helper->crtc_info[i].mode_set.crtc;
modeset = &fb_helper->crtc_info[i].mode_set;
modeset->x = var->xoffset;
modeset->y = var->yoffset;
if (modeset->num_connectors) {
ret = crtc->funcs->set_config(modeset);
if (!ret) {
info->var.xoffset = var->xoffset;
info->var.yoffset = var->yoffset;
}
}
}
mutex_unlock(&dev->mode_config.mutex);
return ret;
}
EXPORT_SYMBOL(drm_fb_helper_pan_display);
int drm_fb_helper_single_fb_probe(struct drm_fb_helper *fb_helper,
int preferred_bpp)
{
int new_fb = 0;
int crtc_count = 0;
int i;
struct fb_info *info;
struct drm_fb_helper_surface_size sizes;
int gamma_size = 0;
memset(&sizes, 0, sizeof(struct drm_fb_helper_surface_size));
sizes.surface_depth = 24;
sizes.surface_bpp = 32;
sizes.fb_width = (unsigned)-1;
sizes.fb_height = (unsigned)-1;
/* if driver picks 8 or 16 by default use that
for both depth/bpp */
if (preferred_bpp != sizes.surface_bpp) {
sizes.surface_depth = sizes.surface_bpp = preferred_bpp;
}
/* first up get a count of crtcs now in use and new min/maxes width/heights */
for (i = 0; i < fb_helper->connector_count; i++) {
struct drm_fb_helper_connector *fb_helper_conn = fb_helper->connector_info[i];
struct drm_cmdline_mode *cmdline_mode;
cmdline_mode = &fb_helper_conn->cmdline_mode;
if (cmdline_mode->bpp_specified) {
switch (cmdline_mode->bpp) {
case 8:
sizes.surface_depth = sizes.surface_bpp = 8;
break;
case 15:
sizes.surface_depth = 15;
sizes.surface_bpp = 16;
break;
case 16:
sizes.surface_depth = sizes.surface_bpp = 16;
break;
case 24:
sizes.surface_depth = sizes.surface_bpp = 24;
break;
case 32:
sizes.surface_depth = 24;
sizes.surface_bpp = 32;
break;
}
break;
}
}
crtc_count = 0;
for (i = 0; i < fb_helper->crtc_count; i++) {
struct drm_display_mode *desired_mode;
desired_mode = fb_helper->crtc_info[i].desired_mode;
if (desired_mode) {
if (gamma_size == 0)
gamma_size = fb_helper->crtc_info[i].mode_set.crtc->gamma_size;
if (desired_mode->hdisplay < sizes.fb_width)
sizes.fb_width = desired_mode->hdisplay;
if (desired_mode->vdisplay < sizes.fb_height)
sizes.fb_height = desired_mode->vdisplay;
if (desired_mode->hdisplay > sizes.surface_width)
sizes.surface_width = desired_mode->hdisplay;
if (desired_mode->vdisplay > sizes.surface_height)
sizes.surface_height = desired_mode->vdisplay;
crtc_count++;
}
}
if (crtc_count == 0 || sizes.fb_width == -1 || sizes.fb_height == -1) {
/* hmm everyone went away - assume VGA cable just fell out
and will come back later. */
DRM_INFO("Cannot find any crtc or sizes - going 1024x768\n");
sizes.fb_width = sizes.surface_width = 1024;
sizes.fb_height = sizes.surface_height = 768;
}
/* push down into drivers */
new_fb = (*fb_helper->funcs->fb_probe)(fb_helper, &sizes);
if (new_fb < 0)
return new_fb;
info = fb_helper->fbdev;
/* set the fb pointer */
for (i = 0; i < fb_helper->crtc_count; i++) {
fb_helper->crtc_info[i].mode_set.fb = fb_helper->fb;
}
if (new_fb) {
info->var.pixclock = 0;
if (register_framebuffer(info) < 0) {
return -EINVAL;
}
printk(KERN_INFO "fb%d: %s frame buffer device\n", info->node,
info->fix.id);
} else {
drm_fb_helper_set_par(info);
}
/* Switch back to kernel console on panic */
/* multi card linked list maybe */
if (list_empty(&kernel_fb_helper_list)) {
printk(KERN_INFO "drm: registered panic notifier\n");
atomic_notifier_chain_register(&panic_notifier_list,
&paniced);
register_sysrq_key('v', &sysrq_drm_fb_helper_restore_op);
}
if (new_fb)
list_add(&fb_helper->kernel_fb_list, &kernel_fb_helper_list);
return 0;
}
EXPORT_SYMBOL(drm_fb_helper_single_fb_probe);
void drm_fb_helper_fill_fix(struct fb_info *info, uint32_t pitch,
uint32_t depth)
{
info->fix.type = FB_TYPE_PACKED_PIXELS;
info->fix.visual = depth == 8 ? FB_VISUAL_PSEUDOCOLOR :
FB_VISUAL_TRUECOLOR;
info->fix.mmio_start = 0;
info->fix.mmio_len = 0;
info->fix.type_aux = 0;
info->fix.xpanstep = 1; /* doing it in hw */
info->fix.ypanstep = 1; /* doing it in hw */
info->fix.ywrapstep = 0;
info->fix.accel = FB_ACCEL_NONE;
info->fix.type_aux = 0;
info->fix.line_length = pitch;
return;
}
EXPORT_SYMBOL(drm_fb_helper_fill_fix);
void drm_fb_helper_fill_var(struct fb_info *info, struct drm_fb_helper *fb_helper,
uint32_t fb_width, uint32_t fb_height)
{
struct drm_framebuffer *fb = fb_helper->fb;
info->pseudo_palette = fb_helper->pseudo_palette;
info->var.xres_virtual = fb->width;
info->var.yres_virtual = fb->height;
info->var.bits_per_pixel = fb->bits_per_pixel;
info->var.accel_flags = FB_ACCELF_TEXT;
info->var.xoffset = 0;
info->var.yoffset = 0;
info->var.activate = FB_ACTIVATE_NOW;
info->var.height = -1;
info->var.width = -1;
switch (fb->depth) {
case 8:
info->var.red.offset = 0;
info->var.green.offset = 0;
info->var.blue.offset = 0;
info->var.red.length = 8; /* 8bit DAC */
info->var.green.length = 8;
info->var.blue.length = 8;
info->var.transp.offset = 0;
info->var.transp.length = 0;
break;
case 15:
info->var.red.offset = 10;
info->var.green.offset = 5;
info->var.blue.offset = 0;
info->var.red.length = 5;
info->var.green.length = 5;
info->var.blue.length = 5;
info->var.transp.offset = 15;
info->var.transp.length = 1;
break;
case 16:
info->var.red.offset = 11;
info->var.green.offset = 5;
info->var.blue.offset = 0;
info->var.red.length = 5;
info->var.green.length = 6;
info->var.blue.length = 5;
info->var.transp.offset = 0;
break;
case 24:
info->var.red.offset = 16;
info->var.green.offset = 8;
info->var.blue.offset = 0;
info->var.red.length = 8;
info->var.green.length = 8;
info->var.blue.length = 8;
info->var.transp.offset = 0;
info->var.transp.length = 0;
break;
case 32:
info->var.red.offset = 16;
info->var.green.offset = 8;
info->var.blue.offset = 0;
info->var.red.length = 8;
info->var.green.length = 8;
info->var.blue.length = 8;
info->var.transp.offset = 24;
info->var.transp.length = 8;
break;
default:
break;
}
info->var.xres = fb_width;
info->var.yres = fb_height;
}
EXPORT_SYMBOL(drm_fb_helper_fill_var);
static int drm_fb_helper_probe_connector_modes(struct drm_fb_helper *fb_helper,
uint32_t maxX,
uint32_t maxY)
{
struct drm_connector *connector;
int count = 0;
int i;
for (i = 0; i < fb_helper->connector_count; i++) {
connector = fb_helper->connector_info[i]->connector;
count += connector->funcs->fill_modes(connector, maxX, maxY);
}
return count;
}
static struct drm_display_mode *drm_has_preferred_mode(struct drm_fb_helper_connector *fb_connector, int width, int height)
{
struct drm_display_mode *mode;
list_for_each_entry(mode, &fb_connector->connector->modes, head) {
if (drm_mode_width(mode) > width ||
drm_mode_height(mode) > height)
continue;
if (mode->type & DRM_MODE_TYPE_PREFERRED)
return mode;
}
return NULL;
}
static bool drm_has_cmdline_mode(struct drm_fb_helper_connector *fb_connector)
{
struct drm_cmdline_mode *cmdline_mode;
cmdline_mode = &fb_connector->cmdline_mode;
return cmdline_mode->specified;
}
static struct drm_display_mode *drm_pick_cmdline_mode(struct drm_fb_helper_connector *fb_helper_conn,
int width, int height)
{
struct drm_cmdline_mode *cmdline_mode;
struct drm_display_mode *mode = NULL;
cmdline_mode = &fb_helper_conn->cmdline_mode;
if (cmdline_mode->specified == false)
return mode;
/* attempt to find a matching mode in the list of modes
* we have gotten so far, if not add a CVT mode that conforms
*/
if (cmdline_mode->rb || cmdline_mode->margins)
goto create_mode;
list_for_each_entry(mode, &fb_helper_conn->connector->modes, head) {
/* check width/height */
if (mode->hdisplay != cmdline_mode->xres ||
mode->vdisplay != cmdline_mode->yres)
continue;
if (cmdline_mode->refresh_specified) {
if (mode->vrefresh != cmdline_mode->refresh)
continue;
}
if (cmdline_mode->interlace) {
if (!(mode->flags & DRM_MODE_FLAG_INTERLACE))
continue;
}
return mode;
}
create_mode:
mode = drm_mode_create_from_cmdline_mode(fb_helper_conn->connector->dev,
cmdline_mode);
list_add(&mode->head, &fb_helper_conn->connector->modes);
return mode;
}
static bool drm_connector_enabled(struct drm_connector *connector, bool strict)
{
bool enable;
if (strict) {
enable = connector->status == connector_status_connected;
} else {
enable = connector->status != connector_status_disconnected;
}
return enable;
}
static void drm_enable_connectors(struct drm_fb_helper *fb_helper,
bool *enabled)
{
bool any_enabled = false;
struct drm_connector *connector;
int i = 0;
for (i = 0; i < fb_helper->connector_count; i++) {
connector = fb_helper->connector_info[i]->connector;
enabled[i] = drm_connector_enabled(connector, true);
DRM_DEBUG_KMS("connector %d enabled? %s\n", connector->base.id,
enabled[i] ? "yes" : "no");
any_enabled |= enabled[i];
}
if (any_enabled)
return;
for (i = 0; i < fb_helper->connector_count; i++) {
connector = fb_helper->connector_info[i]->connector;
enabled[i] = drm_connector_enabled(connector, false);
}
}
static bool drm_target_cloned(struct drm_fb_helper *fb_helper,
struct drm_display_mode **modes,
bool *enabled, int width, int height)
{
int count, i, j;
bool can_clone = false;
struct drm_fb_helper_connector *fb_helper_conn;
struct drm_display_mode *dmt_mode, *mode;
/* only contemplate cloning in the single crtc case */
if (fb_helper->crtc_count > 1)
return false;
count = 0;
for (i = 0; i < fb_helper->connector_count; i++) {
if (enabled[i])
count++;
}
/* only contemplate cloning if more than one connector is enabled */
if (count <= 1)
return false;
/* check the command line or if nothing common pick 1024x768 */
can_clone = true;
for (i = 0; i < fb_helper->connector_count; i++) {
if (!enabled[i])
continue;
fb_helper_conn = fb_helper->connector_info[i];
modes[i] = drm_pick_cmdline_mode(fb_helper_conn, width, height);
if (!modes[i]) {
can_clone = false;
break;
}
for (j = 0; j < i; j++) {
if (!enabled[j])
continue;
if (!drm_mode_equal(modes[j], modes[i]))
can_clone = false;
}
}
if (can_clone) {
DRM_DEBUG_KMS("can clone using command line\n");
return true;
}
/* try and find a 1024x768 mode on each connector */
can_clone = true;
dmt_mode = drm_mode_find_dmt(fb_helper->dev, 1024, 768, 60);
for (i = 0; i < fb_helper->connector_count; i++) {
if (!enabled[i])
continue;
fb_helper_conn = fb_helper->connector_info[i];
list_for_each_entry(mode, &fb_helper_conn->connector->modes, head) {
if (drm_mode_equal(mode, dmt_mode))
modes[i] = mode;
}
if (!modes[i])
can_clone = false;
}
if (can_clone) {
DRM_DEBUG_KMS("can clone using 1024x768\n");
return true;
}
DRM_INFO("kms: can't enable cloning when we probably wanted to.\n");
return false;
}
static bool drm_target_preferred(struct drm_fb_helper *fb_helper,
struct drm_display_mode **modes,
bool *enabled, int width, int height)
{
struct drm_fb_helper_connector *fb_helper_conn;
int i;
for (i = 0; i < fb_helper->connector_count; i++) {
fb_helper_conn = fb_helper->connector_info[i];
if (enabled[i] == false)
continue;
DRM_DEBUG_KMS("looking for cmdline mode on connector %d\n",
fb_helper_conn->connector->base.id);
/* got for command line mode first */
modes[i] = drm_pick_cmdline_mode(fb_helper_conn, width, height);
if (!modes[i]) {
DRM_DEBUG_KMS("looking for preferred mode on connector %d\n",
fb_helper_conn->connector->base.id);
modes[i] = drm_has_preferred_mode(fb_helper_conn, width, height);
}
/* No preferred modes, pick one off the list */
if (!modes[i] && !list_empty(&fb_helper_conn->connector->modes)) {
list_for_each_entry(modes[i], &fb_helper_conn->connector->modes, head)
break;
}
DRM_DEBUG_KMS("found mode %s\n", modes[i] ? modes[i]->name :
"none");
}
return true;
}
static int drm_pick_crtcs(struct drm_fb_helper *fb_helper,
struct drm_fb_helper_crtc **best_crtcs,
struct drm_display_mode **modes,
int n, int width, int height)
{
int c, o;
struct drm_device *dev = fb_helper->dev;
struct drm_connector *connector;
struct drm_connector_helper_funcs *connector_funcs;
struct drm_encoder *encoder;
struct drm_fb_helper_crtc *best_crtc;
int my_score, best_score, score;
struct drm_fb_helper_crtc **crtcs, *crtc;
struct drm_fb_helper_connector *fb_helper_conn;
if (n == fb_helper->connector_count)
return 0;
fb_helper_conn = fb_helper->connector_info[n];
connector = fb_helper_conn->connector;
best_crtcs[n] = NULL;
best_crtc = NULL;
best_score = drm_pick_crtcs(fb_helper, best_crtcs, modes, n+1, width, height);
if (modes[n] == NULL)
return best_score;
crtcs = kzalloc(dev->mode_config.num_connector *
sizeof(struct drm_fb_helper_crtc *), GFP_KERNEL);
if (!crtcs)
return best_score;
my_score = 1;
if (connector->status == connector_status_connected)
my_score++;
if (drm_has_cmdline_mode(fb_helper_conn))
my_score++;
if (drm_has_preferred_mode(fb_helper_conn, width, height))
my_score++;
connector_funcs = connector->helper_private;
encoder = connector_funcs->best_encoder(connector);
if (!encoder)
goto out;
/* select a crtc for this connector and then attempt to configure
remaining connectors */
for (c = 0; c < fb_helper->crtc_count; c++) {
crtc = &fb_helper->crtc_info[c];
if ((encoder->possible_crtcs & (1 << c)) == 0) {
continue;
}
for (o = 0; o < n; o++)
if (best_crtcs[o] == crtc)
break;
if (o < n) {
/* ignore cloning unless only a single crtc */
if (fb_helper->crtc_count > 1)
continue;
if (!drm_mode_equal(modes[o], modes[n]))
continue;
}
crtcs[n] = crtc;
memcpy(crtcs, best_crtcs, n * sizeof(struct drm_fb_helper_crtc *));
score = my_score + drm_pick_crtcs(fb_helper, crtcs, modes, n + 1,
width, height);
if (score > best_score) {
best_crtc = crtc;
best_score = score;
memcpy(best_crtcs, crtcs,
dev->mode_config.num_connector *
sizeof(struct drm_fb_helper_crtc *));
}
}
out:
kfree(crtcs);
return best_score;
}
static void drm_setup_crtcs(struct drm_fb_helper *fb_helper)
{
struct drm_device *dev = fb_helper->dev;
struct drm_fb_helper_crtc **crtcs;
struct drm_display_mode **modes;
struct drm_encoder *encoder;
struct drm_mode_set *modeset;
bool *enabled;
int width, height;
int i, ret;
DRM_DEBUG_KMS("\n");
width = dev->mode_config.max_width;
height = dev->mode_config.max_height;
/* clean out all the encoder/crtc combos */
list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
encoder->crtc = NULL;
}
crtcs = kcalloc(dev->mode_config.num_connector,
sizeof(struct drm_fb_helper_crtc *), GFP_KERNEL);
modes = kcalloc(dev->mode_config.num_connector,
sizeof(struct drm_display_mode *), GFP_KERNEL);
enabled = kcalloc(dev->mode_config.num_connector,
sizeof(bool), GFP_KERNEL);
drm_enable_connectors(fb_helper, enabled);
ret = drm_target_cloned(fb_helper, modes, enabled, width, height);
if (!ret) {
ret = drm_target_preferred(fb_helper, modes, enabled, width, height);
if (!ret)
DRM_ERROR("Unable to find initial modes\n");
}
DRM_DEBUG_KMS("picking CRTCs for %dx%d config\n", width, height);
drm_pick_crtcs(fb_helper, crtcs, modes, 0, width, height);
/* need to set the modesets up here for use later */
/* fill out the connector<->crtc mappings into the modesets */
for (i = 0; i < fb_helper->crtc_count; i++) {
modeset = &fb_helper->crtc_info[i].mode_set;
modeset->num_connectors = 0;
}
for (i = 0; i < fb_helper->connector_count; i++) {
struct drm_display_mode *mode = modes[i];
struct drm_fb_helper_crtc *fb_crtc = crtcs[i];
modeset = &fb_crtc->mode_set;
if (mode && fb_crtc) {
DRM_DEBUG_KMS("desired mode %s set on crtc %d\n",
mode->name, fb_crtc->mode_set.crtc->base.id);
fb_crtc->desired_mode = mode;
if (modeset->mode)
drm_mode_destroy(dev, modeset->mode);
modeset->mode = drm_mode_duplicate(dev,
fb_crtc->desired_mode);
modeset->connectors[modeset->num_connectors++] = fb_helper->connector_info[i]->connector;
}
}
kfree(crtcs);
kfree(modes);
kfree(enabled);
}
/**
* drm_helper_initial_config - setup a sane initial connector configuration
* @dev: DRM device
*
* LOCKING:
* Called at init time, must take mode config lock.
*
* Scan the CRTCs and connectors and try to put together an initial setup.
* At the moment, this is a cloned configuration across all heads with
* a new framebuffer object as the backing store.
*
* RETURNS:
* Zero if everything went ok, nonzero otherwise.
*/
bool drm_fb_helper_initial_config(struct drm_fb_helper *fb_helper, int bpp_sel)
{
struct drm_device *dev = fb_helper->dev;
int count = 0;
/* disable all the possible outputs/crtcs before entering KMS mode */
drm_helper_disable_unused_functions(fb_helper->dev);
drm_fb_helper_parse_command_line(fb_helper);
count = drm_fb_helper_probe_connector_modes(fb_helper,
dev->mode_config.max_width,
dev->mode_config.max_height);
/*
* we shouldn't end up with no modes here.
*/
if (count == 0) {
printk(KERN_INFO "No connectors reported connected with modes\n");
}
drm_setup_crtcs(fb_helper);
return drm_fb_helper_single_fb_probe(fb_helper, bpp_sel);
}
EXPORT_SYMBOL(drm_fb_helper_initial_config);
/**
* drm_fb_helper_hotplug_event - respond to a hotplug notification by
* probing all the outputs attached to the fb.
* @fb_helper: the drm_fb_helper
*
* LOCKING:
* Called at runtime, must take mode config lock.
*
* Scan the connectors attached to the fb_helper and try to put together a
* setup after *notification of a change in output configuration.
*
* RETURNS:
* 0 on success and a non-zero error code otherwise.
*/
int drm_fb_helper_hotplug_event(struct drm_fb_helper *fb_helper)
{
struct drm_device *dev = fb_helper->dev;
int count = 0;
u32 max_width, max_height, bpp_sel;
bool bound = false, crtcs_bound = false;
struct drm_crtc *crtc;
if (!fb_helper->fb)
return 0;
mutex_lock(&dev->mode_config.mutex);
list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
if (crtc->fb)
crtcs_bound = true;
if (crtc->fb == fb_helper->fb)
bound = true;
}
if (!bound && crtcs_bound) {
fb_helper->delayed_hotplug = true;
mutex_unlock(&dev->mode_config.mutex);
return 0;
}
DRM_DEBUG_KMS("\n");
max_width = fb_helper->fb->width;
max_height = fb_helper->fb->height;
bpp_sel = fb_helper->fb->bits_per_pixel;
count = drm_fb_helper_probe_connector_modes(fb_helper, max_width,
max_height);
drm_setup_crtcs(fb_helper);
mutex_unlock(&dev->mode_config.mutex);
return drm_fb_helper_single_fb_probe(fb_helper, bpp_sel);
}
EXPORT_SYMBOL(drm_fb_helper_hotplug_event);
/* The Kconfig DRM_KMS_HELPER selects FRAMEBUFFER_CONSOLE (if !EXPERT)
* but the module doesn't depend on any fb console symbols. At least
* attempt to load fbcon to avoid leaving the system without a usable console.
*/
#if defined(CONFIG_FRAMEBUFFER_CONSOLE_MODULE) && !defined(CONFIG_EXPERT)
static int __init drm_fb_helper_modinit(void)
{
const char *name = "fbcon";
struct module *fbcon;
mutex_lock(&module_mutex);
fbcon = find_module(name);
mutex_unlock(&module_mutex);
if (!fbcon)
request_module_nowait(name);
return 0;
}
module_init(drm_fb_helper_modinit);
#endif