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drm/msm/dp: Prepare for link training per-segment for LTTPRs

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Per-segment link training requires knowing the number of LTTPRs
(if any) present. Store the count during LTTPRs' initialization.

Fixes: 72d0af4acc ("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>
This commit is contained in:
Aleksandrs Vinarskis 2025-05-08 00:59:01 +02:00 committed by Dmitry Baryshkov
parent c156fe2dd4
commit 7513ccb884
2 changed files with 12 additions and 6 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

17
drivers/gpu/drm/msm/dp/dp_display.c
View File

@ -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)

1
drivers/gpu/drm/msm/dp/dp_link.h
View File

@ -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;