[PATCH 1/2] media: iris: avoid bit depth validation for capture formats

[Vishnu Reddy]

When validating a capture format, check_format() compares the requested
pixel format against inst->fw_caps[BIT_DEPTH]. However, the bit depth
capability is not available at this stage and it contains the default
value of BIT_DEPTH_8. The actual bit depth is updated later after the
firmware reports stream capabilities through read_input_subcr_params().
Because of this, a valid QC10C format request is rejected during the
initial format negotiation. The driver then falls back to the default
capture format (NV12) and stores it as capture format.

Later, when the firmware reports that the stream is 10-bit, the driver
sees NV12 as the selected capture format and switches to the default
10-bit format (P010). As a result, the original QC10C format requested
by userspace is lost and QC10C decoding cannot work correctly.

The bit depth information is not reliable during the initial format
setup, so it should not be used to validate capture formats. Remove
the bit-depth checks from check_format() and only verify that the
requested pixel format is supported. This allows the format requested
by userspace is handled correctly.

Fixes: 20c3ef4c7cae ("media: qcom: iris: vdec: update find_format to handle 8bit and 10bit formats")
Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: Vishnu Reddy <busanna.reddy@xxxxxxxxxxxxxxxx>
---
 drivers/media/platform/qcom/iris/iris_vdec.c | 10 ----------
 1 file changed, 10 deletions(-)

diff --git a/drivers/media/platform/qcom/iris/iris_vdec.c b/drivers/media/platform/qcom/iris/iris_vdec.c
index 9e228b70420e..7f89e745a4b1 100644
--- a/drivers/media/platform/qcom/iris/iris_vdec.c
+++ b/drivers/media/platform/qcom/iris/iris_vdec.c
@@ -95,16 +95,6 @@ static bool check_format(struct iris_inst *inst, u32 pixfmt, u32 type)
 	if (i == size)
 		return false;
 
-	if (type == V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE) {
-		if (iris_fmt_is_8bit(pixfmt) &&
-		    inst->fw_caps[BIT_DEPTH].value == BIT_DEPTH_10)
-			return false;
-
-		if (iris_fmt_is_10bit(pixfmt) &&
-		    inst->fw_caps[BIT_DEPTH].value != BIT_DEPTH_10)
-			return false;
-	}
-
 	return true;
 }
 

-- 
2.34.1