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Commit fee5038e authored by Govinda Rajulu Chenna's avatar Govinda Rajulu Chenna
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drm/msm/dp: check dpcd version before dsc dpcd read 



Read DSC DPCD registers only if dsc-feature-enable is enabled
and sink DPCD version is 1.4 or above.

CRs-Fixed: 2325207
Change-Id: Ie2ae34a1d720d7fbbf21dbc48ed3ea57c3d5de0c
Signed-off-by: default avatarGovinda Rajulu Chenna <gchenna@codeaurora.org>
parent 116f80db

drivers/gpu/drm/msm/dp/dp_panel.c

+4 −1
Original line number Diff line number Diff line
@@ -1816,6 +1816,7 @@ static void dp_panel_read_sink_dsc_caps(struct dp_panel *dp_panel) 
	int rlen;

	struct dp_panel_private *panel;

	const int fec_cap = 0x90;

	int dpcd_rev;



	if (!dp_panel) {

		pr_err("invalid input\n");
@@ -1825,10 +1826,12 @@ static void dp_panel_read_sink_dsc_caps(struct dp_panel *dp_panel) 
	dp_panel->dsc_en = false;

	dp_panel->fec_en = false;



	dpcd_rev = dp_panel->dpcd[DP_DPCD_REV];



	panel = container_of(dp_panel, struct dp_panel_private, dp_panel);



	dp_panel->fec_overhead_fp = 0;

	if (panel->parser->dsc_feature_enable) {

	if (panel->parser->dsc_feature_enable && dpcd_rev >= 0x14) {

		rlen = drm_dp_dpcd_read(panel->aux->drm_aux, DP_DSC_SUPPORT,

			dp_panel->dsc_dpcd, (DP_RECEIVER_DSC_CAP_SIZE + 1));

		if (rlen < (DP_RECEIVER_DSC_CAP_SIZE + 1)) {