drm/msm/dp: fix msm_dp_utils_pack_sdp_header interface

The msm_dp_utils_pack_sdp_header() accepts an unlimited-size u32 pointer
for the header output, while it expects a two-element array. It performs
a sizeof check which is always true on 64-bit platforms (since
sizeof(u32*) is 8) and is always false on 32-bit platforms. It returns
an error code which nobody actually checks.

Fix the function interface to accept u32[2] and return void, skipping
all the checks.

Fixes: 55fb8ffc1802 ("drm/msm/dp: add VSC SDP support for YUV420 over DP")
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Reviewed-by: Abhinav Kumar <quic_abhinavk@quicinc.com>
Patchwork: https://patchwork.freedesktop.org/patch/626806/
Link: https://lore.kernel.org/r/20241202-fd-dp-audio-fixup-v2-2-d9187ea96dad@linaro.org
[quic_abhinavk@quicinc.com: minor fix in the commit message]
Signed-off-by: Abhinav Kumar <quic_abhinavk@quicinc.com>

diff --git a/drivers/gpu/drm/msm/dp/dp_utils.c b/drivers/gpu/drm/msm/dp/dp_utils.c
index 2a40f07fe2d5e20114a7692d1269bb8fd5bddbbd..4a5ebb0c33b85e3d55eb974d74c1f54591301b35 100644 (file)
--- a/drivers/gpu/drm/msm/dp/dp_utils.c
+++ b/drivers/gpu/drm/msm/dp/dp_utils.c
@@ -74,14 +74,8 @@ u8 msm_dp_utils_calculate_parity(u32 data)
        return parity_byte;
 }
 
-ssize_t msm_dp_utils_pack_sdp_header(struct dp_sdp_header *sdp_header, u32 *header_buff)
+void msm_dp_utils_pack_sdp_header(struct dp_sdp_header *sdp_header, u32 header_buff[2])
 {
-       size_t length;
-
-       length = sizeof(header_buff);
-       if (length < DP_SDP_HEADER_SIZE)
-               return -ENOSPC;
-
        header_buff[0] = FIELD_PREP(HEADER_0_MASK, sdp_header->HB0) |
                FIELD_PREP(PARITY_0_MASK, msm_dp_utils_calculate_parity(sdp_header->HB0)) |
                FIELD_PREP(HEADER_1_MASK, sdp_header->HB1) |
@@ -91,6 +85,4 @@ ssize_t msm_dp_utils_pack_sdp_header(struct dp_sdp_header *sdp_header, u32 *head
                FIELD_PREP(PARITY_2_MASK, msm_dp_utils_calculate_parity(sdp_header->HB2)) |
                FIELD_PREP(HEADER_3_MASK, sdp_header->HB3) |
                FIELD_PREP(PARITY_3_MASK, msm_dp_utils_calculate_parity(sdp_header->HB3));
-
-       return length;
 }

diff --git a/drivers/gpu/drm/msm/dp/dp_utils.h b/drivers/gpu/drm/msm/dp/dp_utils.h
index 88d53157f5b59e352a29075e4e8deb044a6de3bd..2e4f98a863c4cb971e621ac24b8b58f035236e73 100644 (file)
--- a/drivers/gpu/drm/msm/dp/dp_utils.h
+++ b/drivers/gpu/drm/msm/dp/dp_utils.h
@@ -31,6 +31,6 @@
 u8 msm_dp_utils_get_g0_value(u8 data);
 u8 msm_dp_utils_get_g1_value(u8 data);
 u8 msm_dp_utils_calculate_parity(u32 data);
-ssize_t msm_dp_utils_pack_sdp_header(struct dp_sdp_header *sdp_header, u32 *header_buff);
+void msm_dp_utils_pack_sdp_header(struct dp_sdp_header *sdp_header, u32 header_buff[2]);
 
 #endif /* _DP_UTILS_H_ */