drm/dp: drop the size parameter from drm_dp_vsc_sdp_pack()

Currently the size parameter of drm_dp_vsc_sdp_pack() is always
the size of struct dp_sdp. Hence lets drop this parameter and
use sizeof() directly.

Suggested-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Signed-off-by: Abhinav Kumar <quic_abhinavk@quicinc.com>
Acked-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Acked-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Reviewed-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20240220195348.1270854-2-quic_abhinavk@quicinc.com

drivers/gpu/drm/display/drm_dp_helper.c

@@ -2918,19 +2918,15 @@ EXPORT_SYMBOL(drm_dp_vsc_sdp_log);
  * @vsc: vsc sdp initialized according to its purpose as defined in
  *       table 2-118 - table 2-120 in DP 1.4a specification
  * @sdp: valid handle to the generic dp_sdp which will be packed
- * @size: valid size of the passed sdp handle
  *
  * Returns length of sdp on success and error code on failure
  */
 ssize_t drm_dp_vsc_sdp_pack(const struct drm_dp_vsc_sdp *vsc,
-			    struct dp_sdp *sdp, size_t size)
+			    struct dp_sdp *sdp)
 {
 	size_t length = sizeof(struct dp_sdp);
 
-	if (size < length)
-		return -ENOSPC;
-
-	memset(sdp, 0, size);
+	memset(sdp, 0, sizeof(struct dp_sdp));
 
 	/*
 	 * Prepare VSC Header for SU as per DP 1.4a spec, Table 2-119

drivers/gpu/drm/i915/display/intel_dp.c

@@ -4202,8 +4202,7 @@ static void intel_write_dp_sdp(struct intel_encoder *encoder,
 
 	switch (type) {
 	case DP_SDP_VSC:
-		len = drm_dp_vsc_sdp_pack(&crtc_state->infoframes.vsc, &sdp,
-					  sizeof(sdp));
+		len = drm_dp_vsc_sdp_pack(&crtc_state->infoframes.vsc, &sdp);
 		break;
 	case HDMI_PACKET_TYPE_GAMUT_METADATA:
 		len = intel_dp_hdr_metadata_infoframe_sdp_pack(dev_priv,

include/drm/display/drm_dp_helper.h

@@ -812,7 +812,6 @@ int drm_dp_bw_overhead(int lane_count, int hactive,
 		       int bpp_x16, unsigned long flags);
 int drm_dp_bw_channel_coding_efficiency(bool is_uhbr);
 
-ssize_t drm_dp_vsc_sdp_pack(const struct drm_dp_vsc_sdp *vsc,
-			    struct dp_sdp *sdp, size_t size);
+ssize_t drm_dp_vsc_sdp_pack(const struct drm_dp_vsc_sdp *vsc, struct dp_sdp *sdp);
 
 #endif /* _DRM_DP_HELPER_H_ */