Commit 7513ccb8 authored by Aleksandrs Vinarskis's avatar Aleksandrs Vinarskis Committed by Dmitry Baryshkov
Browse files

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: 72d0af4a ("drm/msm/dp: Add support for LTTPR handling")
Reviewed-by: default avatarAbel Vesa <abel.vesa@linaro.org>
Reviewed-by: default avatarAbhinav Kumar <quic_abhinavk@quicinc.com>
Reviewed-by: default avatarDmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>
Signed-off-by: default avatarAleksandrs Vinarskis <alex.vinarskis@gmail.com>
Tested-by: Jessica Zhang <quic_jesszhan@quicinc.com> # SA8775P
Tested-by: default avatarJohan Hovold <johan+linaro@kernel.org>
Tested-by: default avatarRob 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: default avatarDmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>
parent c156fe2d

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

+11 −6
Original line number Diff line number Diff line
@@ -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)

drivers/gpu/drm/msm/dp/dp_link.h

+1 −0
Original line number Diff line number Diff line
@@ -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;