diff options
| author | Aleksandrs Vinarskis <alex.vinarskis@gmail.com> | 2025-05-08 00:59:01 +0200 |
|---|---|---|
| committer | Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com> | 2025-05-12 19:18:49 +0300 |
| commit | 7513ccb8840b54e35579f3c2cce08c3443a6e2d4 (patch) | |
| tree | 34a9ae2196cfc2c5ae97b24f815b6d16470d020c | |
| parent | c156fe2dd46774321c8eaaff9a6f04b64e6b9742 (diff) | |
drm/msm/dp: Prepare for link training per-segment for LTTPRs
Per-segment link training requires knowing the number of LTTPRs
(if any) present. Store the count during LTTPRs' initialization.
Fixes: 72d0af4accd9 ("drm/msm/dp: Add support for LTTPR handling")
Reviewed-by: Abel Vesa <abel.vesa@linaro.org>
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/652306/
Link: https://lore.kernel.org/r/20250507230113.14270-4-alex.vinarskis@gmail.com
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>
| -rw-r--r-- | drivers/gpu/drm/msm/dp/dp_display.c | 17 | ||||
| -rw-r--r-- | drivers/gpu/drm/msm/dp/dp_link.h | 1 |
2 files changed, 12 insertions, 6 deletions
diff --git a/drivers/gpu/drm/msm/dp/dp_display.c b/drivers/gpu/drm/msm/dp/dp_display.c index ba08350cd9c5..386c4669c831 100644 --- a/drivers/gpu/drm/msm/dp/dp_display.c +++ b/drivers/gpu/drm/msm/dp/dp_display.c @@ -360,16 +360,21 @@ 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, u8 *dpcd) +static int msm_dp_display_lttpr_init(struct msm_dp_display_private *dp, u8 *dpcd) { - int rc; + int rc, lttpr_count; if (drm_dp_read_lttpr_common_caps(dp->aux, dpcd, dp->link->lttpr_common_caps)) - return; + return 0; - rc = drm_dp_lttpr_init(dp->aux, drm_dp_lttpr_count(dp->link->lttpr_common_caps)); - if (rc) + lttpr_count = drm_dp_lttpr_count(dp->link->lttpr_common_caps); + rc = drm_dp_lttpr_init(dp->aux, lttpr_count); + if (rc) { DRM_ERROR("failed to set LTTPRs transparency mode, rc=%d\n", rc); + return 0; + } + + return lttpr_count; } static int msm_dp_display_process_hpd_high(struct msm_dp_display_private *dp) @@ -383,7 +388,7 @@ static int msm_dp_display_process_hpd_high(struct msm_dp_display_private *dp) if (rc) goto end; - msm_dp_display_lttpr_init(dp, dpcd); + dp->link->lttpr_count = msm_dp_display_lttpr_init(dp, dpcd); rc = msm_dp_panel_read_sink_caps(dp->panel, connector); if (rc) diff --git a/drivers/gpu/drm/msm/dp/dp_link.h b/drivers/gpu/drm/msm/dp/dp_link.h index c47d75cfc720..ba47c6d19fbf 100644 --- a/drivers/gpu/drm/msm/dp/dp_link.h +++ b/drivers/gpu/drm/msm/dp/dp_link.h @@ -62,6 +62,7 @@ struct msm_dp_link_phy_params { struct msm_dp_link { u8 lttpr_common_caps[DP_LTTPR_COMMON_CAP_SIZE]; + int lttpr_count; u32 sink_request; u32 test_response; |