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[v2,19/35] media: ti-vpe: cal: add cal_ctx_wr_dma_enable and fix a race

Message ID 20210420120433.902394-20-tomi.valkeinen@ideasonboard.com (mailing list archive)
State New, archived
Headers show
Series media: ti-vpe: cal: prepare for multistream support | expand

Commit Message

Tomi Valkeinen April 20, 2021, 12:04 p.m. UTC 
I have not noticed any errors due to this, but the DMA configuration
looks racy. Setting the DMA mode bitfield in CAL_WR_DMA_CTRL supposedly
enables the DMA. However, the driver currently a) continues configuring
the DMA after setting the mode, and b) enables the DMA interrupts only
after setting the mode.

This probably doesn't cause any issues as there should be no data coming
in to the DMA yet, but it's still better to fix this.

Add a new function, cal_ctx_wr_dma_enable(), to set the DMA mode field,
and call that function only after the DMA config and the irq enabling
has been done.

Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ideasonboard.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
---
 drivers/media/platform/ti-vpe/cal.c | 13 +++++++++++--
 1 file changed, 11 insertions(+), 2 deletions(-)
diff mbox series

Patch

diff --git a/drivers/media/platform/ti-vpe/cal.c b/drivers/media/platform/ti-vpe/cal.c
index c1a6e23ff713..778bef9bbdc4 100644
--- a/drivers/media/platform/ti-vpe/cal.c
+++ b/drivers/media/platform/ti-vpe/cal.c
@@ -409,8 +409,6 @@  static void cal_ctx_wr_dma_config(struct cal_ctx *ctx)
 		      CAL_WR_DMA_CTRL_YSIZE_MASK);
 	cal_set_field(&val, CAL_WR_DMA_CTRL_DTAG_PIX_DAT,
 		      CAL_WR_DMA_CTRL_DTAG_MASK);
-	cal_set_field(&val, CAL_WR_DMA_CTRL_MODE_CONST,
-		      CAL_WR_DMA_CTRL_MODE_MASK);
 	cal_set_field(&val, CAL_WR_DMA_CTRL_PATTERN_LINEAR,
 		      CAL_WR_DMA_CTRL_PATTERN_MASK);
 	cal_set_field(&val, 1, CAL_WR_DMA_CTRL_STALL_RD_MASK);
@@ -442,6 +440,15 @@  void cal_ctx_set_dma_addr(struct cal_ctx *ctx, dma_addr_t addr)
 	cal_write(ctx->cal, CAL_WR_DMA_ADDR(ctx->dma_ctx), addr);
 }
 
+static void cal_ctx_wr_dma_enable(struct cal_ctx *ctx)
+{
+	u32 val = cal_read(ctx->cal, CAL_WR_DMA_CTRL(ctx->dma_ctx));
+
+	cal_set_field(&val, CAL_WR_DMA_CTRL_MODE_CONST,
+		      CAL_WR_DMA_CTRL_MODE_MASK);
+	cal_write(ctx->cal, CAL_WR_DMA_CTRL(ctx->dma_ctx), val);
+}
+
 static void cal_ctx_wr_dma_disable(struct cal_ctx *ctx)
 {
 	u32 val = cal_read(ctx->cal, CAL_WR_DMA_CTRL(ctx->dma_ctx));
@@ -500,6 +507,8 @@  void cal_ctx_start(struct cal_ctx *ctx)
 		  CAL_HL_IRQ_WDMA_END_MASK(ctx->dma_ctx));
 	cal_write(ctx->cal, CAL_HL_IRQENABLE_SET(2),
 		  CAL_HL_IRQ_WDMA_START_MASK(ctx->dma_ctx));
+
+	cal_ctx_wr_dma_enable(ctx);
 }
 
 void cal_ctx_stop(struct cal_ctx *ctx)