linux/drivers/gpu/ipu-v3/ipu-dmfc.c
Liu Ying 448ae8ea39 gpu: ipu-v3: Do not wait for DMFC FIFO to clear when disabling DMFC channel
According to basic tests, it looks there is no issue if we don't wait for
DMFC FIFO to clear when disabling DMFC channel.  NXP BSP doesn't do that,
either.  This patch is needed to avoid the annoying warning caused by a
timeout on waiting for the FIFO to clear after we add the new
DRM_PLANE_COMMIT_NO_DISABLE_AFTER_MODESET flag to the imx-drm driver
which changes the procedure to disable display channel slightly.

Cc: Philipp Zabel <p.zabel@pengutronix.de>
Cc: David Airlie <airlied@linux.ie>
Cc: Russell King <linux@armlinux.org.uk>
Cc: Peter Senna Tschudin <peter.senna@gmail.com>
Cc: Lucas Stach <l.stach@pengutronix.de>
Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: Liu Ying <gnuiyl@gmail.com>
Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de>
2016-08-29 12:45:05 +02:00

224 lines
5.3 KiB
C

/*
* Copyright (c) 2010 Sascha Hauer <s.hauer@pengutronix.de>
* Copyright (C) 2005-2009 Freescale Semiconductor, Inc.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2 of the License, or (at your
* option) any later version.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* for more details.
*/
#include <linux/export.h>
#include <linux/types.h>
#include <linux/errno.h>
#include <linux/io.h>
#include <video/imx-ipu-v3.h>
#include "ipu-prv.h"
#define DMFC_RD_CHAN 0x0000
#define DMFC_WR_CHAN 0x0004
#define DMFC_WR_CHAN_DEF 0x0008
#define DMFC_DP_CHAN 0x000c
#define DMFC_DP_CHAN_DEF 0x0010
#define DMFC_GENERAL1 0x0014
#define DMFC_GENERAL2 0x0018
#define DMFC_IC_CTRL 0x001c
#define DMFC_WR_CHAN_ALT 0x0020
#define DMFC_WR_CHAN_DEF_ALT 0x0024
#define DMFC_DP_CHAN_ALT 0x0028
#define DMFC_DP_CHAN_DEF_ALT 0x002c
#define DMFC_GENERAL1_ALT 0x0030
#define DMFC_STAT 0x0034
#define DMFC_WR_CHAN_1_28 0
#define DMFC_WR_CHAN_2_41 8
#define DMFC_WR_CHAN_1C_42 16
#define DMFC_WR_CHAN_2C_43 24
#define DMFC_DP_CHAN_5B_23 0
#define DMFC_DP_CHAN_5F_27 8
#define DMFC_DP_CHAN_6B_24 16
#define DMFC_DP_CHAN_6F_29 24
struct dmfc_channel_data {
int ipu_channel;
unsigned long channel_reg;
unsigned long shift;
unsigned eot_shift;
unsigned max_fifo_lines;
};
static const struct dmfc_channel_data dmfcdata[] = {
{
.ipu_channel = IPUV3_CHANNEL_MEM_BG_SYNC,
.channel_reg = DMFC_DP_CHAN,
.shift = DMFC_DP_CHAN_5B_23,
.eot_shift = 20,
.max_fifo_lines = 3,
}, {
.ipu_channel = 24,
.channel_reg = DMFC_DP_CHAN,
.shift = DMFC_DP_CHAN_6B_24,
.eot_shift = 22,
.max_fifo_lines = 1,
}, {
.ipu_channel = IPUV3_CHANNEL_MEM_FG_SYNC,
.channel_reg = DMFC_DP_CHAN,
.shift = DMFC_DP_CHAN_5F_27,
.eot_shift = 21,
.max_fifo_lines = 2,
}, {
.ipu_channel = IPUV3_CHANNEL_MEM_DC_SYNC,
.channel_reg = DMFC_WR_CHAN,
.shift = DMFC_WR_CHAN_1_28,
.eot_shift = 16,
.max_fifo_lines = 2,
}, {
.ipu_channel = 29,
.channel_reg = DMFC_DP_CHAN,
.shift = DMFC_DP_CHAN_6F_29,
.eot_shift = 23,
.max_fifo_lines = 1,
},
};
#define DMFC_NUM_CHANNELS ARRAY_SIZE(dmfcdata)
struct ipu_dmfc_priv;
struct dmfc_channel {
unsigned slots;
struct ipu_soc *ipu;
struct ipu_dmfc_priv *priv;
const struct dmfc_channel_data *data;
};
struct ipu_dmfc_priv {
struct ipu_soc *ipu;
struct device *dev;
struct dmfc_channel channels[DMFC_NUM_CHANNELS];
struct mutex mutex;
void __iomem *base;
int use_count;
};
int ipu_dmfc_enable_channel(struct dmfc_channel *dmfc)
{
struct ipu_dmfc_priv *priv = dmfc->priv;
mutex_lock(&priv->mutex);
if (!priv->use_count)
ipu_module_enable(priv->ipu, IPU_CONF_DMFC_EN);
priv->use_count++;
mutex_unlock(&priv->mutex);
return 0;
}
EXPORT_SYMBOL_GPL(ipu_dmfc_enable_channel);
void ipu_dmfc_disable_channel(struct dmfc_channel *dmfc)
{
struct ipu_dmfc_priv *priv = dmfc->priv;
mutex_lock(&priv->mutex);
priv->use_count--;
if (!priv->use_count)
ipu_module_disable(priv->ipu, IPU_CONF_DMFC_EN);
if (priv->use_count < 0)
priv->use_count = 0;
mutex_unlock(&priv->mutex);
}
EXPORT_SYMBOL_GPL(ipu_dmfc_disable_channel);
void ipu_dmfc_config_wait4eot(struct dmfc_channel *dmfc, int width)
{
struct ipu_dmfc_priv *priv = dmfc->priv;
u32 dmfc_gen1;
mutex_lock(&priv->mutex);
dmfc_gen1 = readl(priv->base + DMFC_GENERAL1);
if ((dmfc->slots * 64 * 4) / width > dmfc->data->max_fifo_lines)
dmfc_gen1 |= 1 << dmfc->data->eot_shift;
else
dmfc_gen1 &= ~(1 << dmfc->data->eot_shift);
writel(dmfc_gen1, priv->base + DMFC_GENERAL1);
mutex_unlock(&priv->mutex);
}
EXPORT_SYMBOL_GPL(ipu_dmfc_config_wait4eot);
struct dmfc_channel *ipu_dmfc_get(struct ipu_soc *ipu, int ipu_channel)
{
struct ipu_dmfc_priv *priv = ipu->dmfc_priv;
int i;
for (i = 0; i < DMFC_NUM_CHANNELS; i++)
if (dmfcdata[i].ipu_channel == ipu_channel)
return &priv->channels[i];
return ERR_PTR(-ENODEV);
}
EXPORT_SYMBOL_GPL(ipu_dmfc_get);
void ipu_dmfc_put(struct dmfc_channel *dmfc)
{
}
EXPORT_SYMBOL_GPL(ipu_dmfc_put);
int ipu_dmfc_init(struct ipu_soc *ipu, struct device *dev, unsigned long base,
struct clk *ipu_clk)
{
struct ipu_dmfc_priv *priv;
int i;
priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
if (!priv)
return -ENOMEM;
priv->base = devm_ioremap(dev, base, PAGE_SIZE);
if (!priv->base)
return -ENOMEM;
priv->dev = dev;
priv->ipu = ipu;
mutex_init(&priv->mutex);
ipu->dmfc_priv = priv;
for (i = 0; i < DMFC_NUM_CHANNELS; i++) {
priv->channels[i].priv = priv;
priv->channels[i].ipu = ipu;
priv->channels[i].data = &dmfcdata[i];
if (dmfcdata[i].ipu_channel == IPUV3_CHANNEL_MEM_BG_SYNC ||
dmfcdata[i].ipu_channel == IPUV3_CHANNEL_MEM_FG_SYNC ||
dmfcdata[i].ipu_channel == IPUV3_CHANNEL_MEM_DC_SYNC)
priv->channels[i].slots = 2;
}
writel(0x00000050, priv->base + DMFC_WR_CHAN);
writel(0x00005654, priv->base + DMFC_DP_CHAN);
writel(0x202020f6, priv->base + DMFC_WR_CHAN_DEF);
writel(0x2020f6f6, priv->base + DMFC_DP_CHAN_DEF);
writel(0x00000003, priv->base + DMFC_GENERAL1);
return 0;
}
void ipu_dmfc_exit(struct ipu_soc *ipu)
{
}