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drm/msm/dp: Fix support of LTTPR initialization

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Initialize LTTPR before msm_dp_panel_read_sink_caps, as DPTX shall
(re)read DPRX caps after LTTPR detection, as required by DP 2.1a,
Section 3.6.7.6.1.

Fixes: 72d0af4acc ("drm/msm/dp: Add support for LTTPR handling")
Reviewed-by: Abhinav Kumar <quic_abhinavk@quicinc.com>
Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>
Signed-off-by: Aleksandrs Vinarskis <alex.vinarskis@gmail.com>
Tested-by: Jessica Zhang <quic_jesszhan@quicinc.com> # SA8775P
Tested-by: Johan Hovold <johan+linaro@kernel.org>
Tested-by: Rob Clark <robdclark@gmail.com>
Patchwork: https://patchwork.freedesktop.org/patch/652301/
Link: https://lore.kernel.org/r/20250507230113.14270-2-alex.vinarskis@gmail.com
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>
This commit is contained in:
Aleksandrs Vinarskis 2025-05-08 00:58:59 +02:00 committed by Dmitry Baryshkov
parent de01fc9fa1
commit 9351d3d302
1 changed files with 9 additions and 4 deletions
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13
drivers/gpu/drm/msm/dp/dp_display.c
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@ -360,12 +360,12 @@ static int msm_dp_display_send_hpd_notification(struct msm_dp_display_private *d
return 0;
}
static void msm_dp_display_lttpr_init(struct msm_dp_display_private *dp)
static void msm_dp_display_lttpr_init(struct msm_dp_display_private *dp, u8 *dpcd)
{
u8 lttpr_caps[DP_LTTPR_COMMON_CAP_SIZE];
int rc;
if (drm_dp_read_lttpr_common_caps(dp->aux, dp->panel->dpcd, lttpr_caps))
if (drm_dp_read_lttpr_common_caps(dp->aux, dpcd, lttpr_caps))
return;
rc = drm_dp_lttpr_init(dp->aux, drm_dp_lttpr_count(lttpr_caps));
@ -378,13 +378,18 @@ static int msm_dp_display_process_hpd_high(struct msm_dp_display_private *dp)
struct drm_connector *connector = dp->msm_dp_display.connector;
const struct drm_display_info *info = &connector->display_info;
int rc = 0;
u8 dpcd[DP_RECEIVER_CAP_SIZE];
rc = drm_dp_read_dpcd_caps(dp->aux, dpcd);
if (rc)
goto end;
msm_dp_display_lttpr_init(dp, dpcd);
rc = msm_dp_panel_read_sink_caps(dp->panel, connector);
if (rc)
goto end;
msm_dp_display_lttpr_init(dp);
msm_dp_link_process_request(dp->link);
if (!dp->msm_dp_display.is_edp)