media: ti-vpe: cal: Simplify the context API

Rework the context API exposed to cal-video.c to simplify it. The
configuration and enable steps are all grouped in a single
cal_ctx_start() function, and the DMA stop and IRQ disable are similarly
groupd in cal_ctx_stop(). The cal_ctx_wr_dma_addr() function is renamed
to cal_ctx_set_dma_addr() for consistency with the cal_ctx_ prefix of
the start and stop functions.
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Benoit Parrot <bparrot@ti.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>

drivers/media/platform/ti-vpe/cal-video.c

@@ -518,16 +518,11 @@ static int cal_start_streaming(struct vb2_queue *vq, unsigned int count)
 	spin_unlock_irq(&ctx->dma.lock);
 
 	addr = vb2_dma_contig_plane_dma_addr(&buf->vb.vb2_buf, 0);
-	ctx->sequence = 0;
-	ctx->dma.state = CAL_DMA_RUNNING;
 
 	pm_runtime_get_sync(ctx->cal->dev);
 
-	cal_ctx_csi2_config(ctx);
-	cal_ctx_pix_proc_config(ctx);
-	cal_ctx_wr_dma_config(ctx);
-	cal_ctx_wr_dma_addr(ctx, addr);
-	cal_ctx_enable_irqs(ctx);
+	cal_ctx_set_dma_addr(ctx, addr);
+	cal_ctx_start(ctx);
 
 	ret = v4l2_subdev_call(&ctx->phy->subdev, video, s_stream, 1);
 	if (ret)
@@ -539,9 +534,8 @@ static int cal_start_streaming(struct vb2_queue *vq, unsigned int count)
 	return 0;
 
 err:
-	cal_ctx_wr_dma_disable(ctx);
-	cal_ctx_disable_irqs(ctx);
-	ctx->dma.state = CAL_DMA_STOPPED;
+	cal_ctx_stop(ctx);
+	pm_runtime_put_sync(ctx->cal->dev);
 
 	cal_release_buffers(ctx, VB2_BUF_STATE_QUEUED);
 	return ret;
@@ -551,14 +545,13 @@ static void cal_stop_streaming(struct vb2_queue *vq)
 {
 	struct cal_ctx *ctx = vb2_get_drv_priv(vq);
 
-	cal_ctx_wr_dma_stop(ctx);
-	cal_ctx_disable_irqs(ctx);
+	cal_ctx_stop(ctx);
 
 	v4l2_subdev_call(&ctx->phy->subdev, video, s_stream, 0);
 
-	cal_release_buffers(ctx, VB2_BUF_STATE_ERROR);
-
 	pm_runtime_put_sync(ctx->cal->dev);
+
+	cal_release_buffers(ctx, VB2_BUF_STATE_ERROR);
 }
 
 static const struct vb2_ops cal_video_qops = {

drivers/media/platform/ti-vpe/cal.c

@@ -280,7 +280,7 @@ void cal_quickdump_regs(struct cal_dev *cal)
  * ------------------------------------------------------------------
  */
 
-void cal_ctx_csi2_config(struct cal_ctx *ctx)
+static void cal_ctx_csi2_config(struct cal_ctx *ctx)
 {
 	u32 val;
 
@@ -305,7 +305,7 @@ void cal_ctx_csi2_config(struct cal_ctx *ctx)
 		cal_read(ctx->cal, CAL_CSI2_CTX0(ctx->index)));
 }
 
-void cal_ctx_pix_proc_config(struct cal_ctx *ctx)
+static void cal_ctx_pix_proc_config(struct cal_ctx *ctx)
 {
 	u32 val, extract, pack;
 
@@ -356,7 +356,7 @@ void cal_ctx_pix_proc_config(struct cal_ctx *ctx)
 		cal_read(ctx->cal, CAL_PIX_PROC(ctx->index)));
 }
 
-void cal_ctx_wr_dma_config(struct cal_ctx *ctx)
+static void cal_ctx_wr_dma_config(struct cal_ctx *ctx)
 {
 	unsigned int stride = ctx->v_fmt.fmt.pix.bytesperline;
 	u32 val;
@@ -406,12 +406,12 @@ void cal_ctx_wr_dma_config(struct cal_ctx *ctx)
 	ctx_dbg(3, ctx, "CAL_CTRL = 0x%08x\n", cal_read(ctx->cal, CAL_CTRL));
 }
 
-void cal_ctx_wr_dma_addr(struct cal_ctx *ctx, dma_addr_t addr)
+void cal_ctx_set_dma_addr(struct cal_ctx *ctx, dma_addr_t addr)
 {
 	cal_write(ctx->cal, CAL_WR_DMA_ADDR(ctx->index), addr);
 }
 
-void cal_ctx_wr_dma_disable(struct cal_ctx *ctx)
+static void cal_ctx_wr_dma_disable(struct cal_ctx *ctx)
 {
 	u32 val = cal_read(ctx->cal, CAL_WR_DMA_CTRL(ctx->index));
 
@@ -431,11 +431,31 @@ static bool cal_ctx_wr_dma_stopped(struct cal_ctx *ctx)
 	return stopped;
 }
 
-int cal_ctx_wr_dma_stop(struct cal_ctx *ctx)
+void cal_ctx_start(struct cal_ctx *ctx)
+{
+	ctx->sequence = 0;
+	ctx->dma.state = CAL_DMA_RUNNING;
+
+	/* Configure the CSI-2, pixel processing and write DMA contexts. */
+	cal_ctx_csi2_config(ctx);
+	cal_ctx_pix_proc_config(ctx);
+	cal_ctx_wr_dma_config(ctx);
+
+	/* Enable IRQ_WDMA_END and IRQ_WDMA_START. */
+	cal_write(ctx->cal, CAL_HL_IRQENABLE_SET(1),
+		  CAL_HL_IRQ_MASK(ctx->index));
+	cal_write(ctx->cal, CAL_HL_IRQENABLE_SET(2),
+		  CAL_HL_IRQ_MASK(ctx->index));
+}
+
+void cal_ctx_stop(struct cal_ctx *ctx)
 {
 	long timeout;
 
-	/* Request DMA stop and wait until it completes. */
+	/*
+	 * Request DMA stop and wait until it completes. If completion times
+	 * out, forcefully disable the DMA.
+	 */
 	spin_lock_irq(&ctx->dma.lock);
 	ctx->dma.state = CAL_DMA_STOP_REQUESTED;
 	spin_unlock_irq(&ctx->dma.lock);
@@ -444,28 +464,16 @@ int cal_ctx_wr_dma_stop(struct cal_ctx *ctx)
 				     msecs_to_jiffies(500));
 	if (!timeout) {
 		ctx_err(ctx, "failed to disable dma cleanly\n");
-		return -ETIMEDOUT;
+		cal_ctx_wr_dma_disable(ctx);
 	}
 
-	return 0;
-}
-
-void cal_ctx_enable_irqs(struct cal_ctx *ctx)
-{
-	/* Enable IRQ_WDMA_END and IRQ_WDMA_START. */
-	cal_write(ctx->cal, CAL_HL_IRQENABLE_SET(1),
-		  CAL_HL_IRQ_MASK(ctx->index));
-	cal_write(ctx->cal, CAL_HL_IRQENABLE_SET(2),
-		  CAL_HL_IRQ_MASK(ctx->index));
-}
-
-void cal_ctx_disable_irqs(struct cal_ctx *ctx)
-{
 	/* Disable IRQ_WDMA_END and IRQ_WDMA_START. */
 	cal_write(ctx->cal, CAL_HL_IRQENABLE_CLR(1),
 		  CAL_HL_IRQ_MASK(ctx->index));
 	cal_write(ctx->cal, CAL_HL_IRQENABLE_CLR(2),
 		  CAL_HL_IRQ_MASK(ctx->index));
+
+	ctx->dma.state = CAL_DMA_STOPPED;
 }
 
 /* ------------------------------------------------------------------
@@ -496,7 +504,7 @@ static inline void cal_irq_wdma_start(struct cal_ctx *ctx)
 		buf = list_first_entry(&ctx->dma.queue, struct cal_buffer,
 				       list);
 		addr = vb2_dma_contig_plane_dma_addr(&buf->vb.vb2_buf, 0);
-		cal_ctx_wr_dma_addr(ctx, addr);
+		cal_ctx_set_dma_addr(ctx, addr);
 
 		ctx->dma.pending = buf;
 		list_del(&buf->list);

drivers/media/platform/ti-vpe/cal.h

@@ -296,14 +296,9 @@ struct cal_camerarx *cal_camerarx_create(struct cal_dev *cal,
 					 unsigned int instance);
 void cal_camerarx_destroy(struct cal_camerarx *phy);
 
-void cal_ctx_csi2_config(struct cal_ctx *ctx);
-void cal_ctx_pix_proc_config(struct cal_ctx *ctx);
-void cal_ctx_wr_dma_config(struct cal_ctx *ctx);
-void cal_ctx_wr_dma_addr(struct cal_ctx *ctx, dma_addr_t addr);
-void cal_ctx_wr_dma_disable(struct cal_ctx *ctx);
-int cal_ctx_wr_dma_stop(struct cal_ctx *ctx);
-void cal_ctx_enable_irqs(struct cal_ctx *ctx);
-void cal_ctx_disable_irqs(struct cal_ctx *ctx);
+void cal_ctx_set_dma_addr(struct cal_ctx *ctx, dma_addr_t addr);
+void cal_ctx_start(struct cal_ctx *ctx);
+void cal_ctx_stop(struct cal_ctx *ctx);
 
 int cal_ctx_v4l2_register(struct cal_ctx *ctx);
 void cal_ctx_v4l2_unregister(struct cal_ctx *ctx);