[PATCH v2 04/20] drm/msm/dp: Accept a const SDP header when packing

[Xilin Wu]

The SDP header packing helper only reads the header. Mark its input const
so callers can pack headers from read-only SDP packets without discarding
the qualifier. This prepares for the generic SDP writer accepting const
packets without changing the packed header bytes.

Assisted-by: LLM
Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@xxxxxxxxxxxxxxxx>
Signed-off-by: Xilin Wu <sophon@xxxxxxxxx>
---
 drivers/gpu/drm/msm/dp/dp_utils.c | 3 ++-
 drivers/gpu/drm/msm/dp/dp_utils.h | 3 ++-
 2 files changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/msm/dp/dp_utils.c b/drivers/gpu/drm/msm/dp/dp_utils.c
index 4a5ebb0c33b8..226b370ce8fe 100644
--- a/drivers/gpu/drm/msm/dp/dp_utils.c
+++ b/drivers/gpu/drm/msm/dp/dp_utils.c
@@ -74,7 +74,8 @@ u8 msm_dp_utils_calculate_parity(u32 data)
 	return parity_byte;
 }
 
-void msm_dp_utils_pack_sdp_header(struct dp_sdp_header *sdp_header, u32 header_buff[2])
+void msm_dp_utils_pack_sdp_header(const struct dp_sdp_header *sdp_header,
+				  u32 header_buff[2])
 {
 	header_buff[0] = FIELD_PREP(HEADER_0_MASK, sdp_header->HB0) |
 		FIELD_PREP(PARITY_0_MASK, msm_dp_utils_calculate_parity(sdp_header->HB0)) |
diff --git a/drivers/gpu/drm/msm/dp/dp_utils.h b/drivers/gpu/drm/msm/dp/dp_utils.h
index 2e4f98a863c4..2fdb89efc57c 100644
--- a/drivers/gpu/drm/msm/dp/dp_utils.h
+++ b/drivers/gpu/drm/msm/dp/dp_utils.h
@@ -31,6 +31,7 @@
 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);
-void msm_dp_utils_pack_sdp_header(struct dp_sdp_header *sdp_header, u32 header_buff[2]);
+void msm_dp_utils_pack_sdp_header(const struct dp_sdp_header *sdp_header,
+				  u32 header_buff[2]);
 
 #endif /* _DP_UTILS_H_ */

-- 
2.56.0