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Subject: media: bttv: refactor bttv_set_dma()
Author: Deborah Brouwer <deborah.brou...@collabora.com>
Date: Fri Jul 14 19:16:07 2023 -0700
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.brou...@collabora.com>
Signed-off-by: Hans Verkuil <hverkuil-ci...@xs4all.nl>
drivers/media/pci/bt8xx/bttv-risc.c | 111 +++++++++++++++++++++++-------------
drivers/media/pci/bt8xx/bttvp.h | 1 -
2 files changed, 71 insertions(+), 41 deletions(-)
---
diff --git a/drivers/media/pci/bt8xx/bttv-risc.c
b/drivers/media/pci/bt8xx/bttv-risc.c
index 97248e340a28..3e0dac56de54 100644
--- a/drivers/media/pci/bt8xx/bttv-risc.c
+++ b/drivers/media/pci/bt8xx/bttv-risc.c
@@ -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);
+}
+
+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);
+}
+
+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;
- 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;
+ bttv_set_risc_status(btv);
+ bttv_set_irq_timer(btv);
+ capctl = bttv_set_capture_control(btv, start_capture);
- capctl = 0;
- capctl |= (btv->cap_ctl & 0x03) ? 0x03 : 0x00; /* capture */
- capctl |= (btv->cap_ctl & 0x0c) ? 0x0c : 0x00; /* vbi data */
- capctl |= override;
+ 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
diff --git a/drivers/media/pci/bt8xx/bttvp.h b/drivers/media/pci/bt8xx/bttvp.h
index bce2401de9bd..b750dfbc75cc 100644
--- a/drivers/media/pci/bt8xx/bttvp.h
+++ b/drivers/media/pci/bt8xx/bttvp.h
@@ -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;
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