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media: bttv: refactor bttv_set_dma()

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Break bttv_set_dma() into several smaller, separate functions so it is
easier to read the risc and dma code. Replace numeric values with
descriptive macros. Also remove the unused field btv->cap_ctl.

Signed-off-by: Deborah Brouwer <deborah.brouwer@collabora.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
This commit is contained in:
Deborah Brouwer 2023-07-14 19:16:07 -07:00 committed by Mauro Carvalho Chehab
parent c9c0df318a
commit 7df8d5cffa
2 changed files with 71 additions and 41 deletions
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111
drivers/media/pci/bt8xx/bttv-risc.c
View file

@ -360,21 +360,80 @@ bttv_apply_geo(struct bttv *btv, struct bttv_geometry *geo, int odd)
/* ---------------------------------------------------------- */
/* risc group / risc main loop / dma management */
void
bttv_set_dma(struct bttv *btv, int override)
static void bttv_set_risc_status(struct bttv *btv)
{
unsigned long cmd;
int capctl;
unsigned long cmd = BT848_RISC_JUMP;
/*
* The value of btv->loop_irq sets or resets the RISC_STATUS for video
* and/or vbi by setting the value of bits [23:16] in the first dword
* of the JUMP instruction:
* video risc: set (1) and reset (~1)
* vbi risc: set(4) and reset (~4)
*/
if (btv->loop_irq) {
cmd |= BT848_RISC_IRQ;
cmd |= (btv->loop_irq & 0x0f) << 16;
cmd |= (~btv->loop_irq & 0x0f) << 20;
}
btv->main.cpu[RISC_SLOT_LOOP] = cpu_to_le32(cmd);
}
btv->cap_ctl = 0;
if (NULL != btv->curr.top) btv->cap_ctl |= 0x02;
if (NULL != btv->curr.bottom) btv->cap_ctl |= 0x01;
if (NULL != btv->cvbi) btv->cap_ctl |= 0x0c;
static void bttv_set_irq_timer(struct bttv *btv)
{
if (btv->curr.frame_irq || btv->loop_irq || btv->cvbi)
mod_timer(&btv->timeout, jiffies + BTTV_TIMEOUT);
else
del_timer(&btv->timeout);
}
capctl = 0;
capctl |= (btv->cap_ctl & 0x03) ? 0x03 : 0x00; /* capture */
capctl |= (btv->cap_ctl & 0x0c) ? 0x0c : 0x00; /* vbi data */
capctl |= override;
static int bttv_set_capture_control(struct bttv *btv, int start_capture)
{
int capctl = 0;
if (btv->curr.top || btv->curr.bottom)
capctl = BT848_CAP_CTL_CAPTURE_ODD |
BT848_CAP_CTL_CAPTURE_EVEN;
if (btv->cvbi)
capctl |= BT848_CAP_CTL_CAPTURE_VBI_ODD |
BT848_CAP_CTL_CAPTURE_VBI_EVEN;
capctl |= start_capture;
btaor(capctl, ~0x0f, BT848_CAP_CTL);
return capctl;
}
static void bttv_start_dma(struct bttv *btv)
{
if (btv->dma_on)
return;
btwrite(btv->main.dma, BT848_RISC_STRT_ADD);
btor(0x3, BT848_GPIO_DMA_CTL);
btv->dma_on = 1;
}
static void bttv_stop_dma(struct bttv *btv)
{
if (!btv->dma_on)
return;
btand(~0x3, BT848_GPIO_DMA_CTL);
btv->dma_on = 0;
}
void bttv_set_dma(struct bttv *btv, int start_capture)
{
int capctl = 0;
bttv_set_risc_status(btv);
bttv_set_irq_timer(btv);
capctl = bttv_set_capture_control(btv, start_capture);
if (capctl)
bttv_start_dma(btv);
else
bttv_stop_dma(btv);
d2printk("%d: capctl=%x lirq=%d top=%08llx/%08llx even=%08llx/%08llx\n",
btv->c.nr,capctl,btv->loop_irq,
@ -382,34 +441,6 @@ bttv_set_dma(struct bttv *btv, int override)
btv->curr.top ? (unsigned long long)btv->curr.top->top.dma : 0,
btv->cvbi ? (unsigned long long)btv->cvbi->bottom.dma : 0,
btv->curr.bottom ? (unsigned long long)btv->curr.bottom->bottom.dma : 0);
cmd = BT848_RISC_JUMP;
if (btv->loop_irq) {
cmd |= BT848_RISC_IRQ;
cmd |= (btv->loop_irq & 0x0f) << 16;
cmd |= (~btv->loop_irq & 0x0f) << 20;
}
if (btv->curr.frame_irq || btv->loop_irq || btv->cvbi) {
mod_timer(&btv->timeout, jiffies+BTTV_TIMEOUT);
} else {
del_timer(&btv->timeout);
}
btv->main.cpu[RISC_SLOT_LOOP] = cpu_to_le32(cmd);
btaor(capctl, ~0x0f, BT848_CAP_CTL);
if (capctl) {
if (btv->dma_on)
return;
btwrite(btv->main.dma, BT848_RISC_STRT_ADD);
btor(3, BT848_GPIO_DMA_CTL);
btv->dma_on = 1;
} else {
if (!btv->dma_on)
return;
btand(~3, BT848_GPIO_DMA_CTL);
btv->dma_on = 0;
}
return;
}
int

1
drivers/media/pci/bt8xx/bttvp.h
View file

@ -430,7 +430,6 @@ struct bttv {
int loop_irq;
int new_input;
unsigned long cap_ctl;
unsigned long dma_on;
struct timer_list timeout;
struct bttv_suspend_state state;