github-mirror/linux
1
0
Fork 0
mirror of https://github.com/torvalds/linux.git synced 2026-05-23 22:52:19 +02:00
Code Issues Actions Packages Projects Releases Wiki Activity Graph

drm/msm/dp: Account for LTTPRs capabilities

Browse Source 
Take into account LTTPR capabilities when selecting maximum allowed
link rate, number of data lines.

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/652302/
Link: https://lore.kernel.org/r/20250507230113.14270-3-alex.vinarskis@gmail.com
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>
This commit is contained in:
Aleksandrs Vinarskis 2025-05-08 00:59:00 +02:00 committed by Dmitry Baryshkov
parent 9351d3d302
commit c156fe2dd4
3 changed files with 16 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

5
drivers/gpu/drm/msm/dp/dp_display.c
View File

@ -362,13 +362,12 @@ static int msm_dp_display_send_hpd_notification(struct msm_dp_display_private *d
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, dpcd, lttpr_caps))
if (drm_dp_read_lttpr_common_caps(dp->aux, dpcd, dp->link->lttpr_common_caps))
return;
rc = drm_dp_lttpr_init(dp->aux, drm_dp_lttpr_count(lttpr_caps));
rc = drm_dp_lttpr_init(dp->aux, drm_dp_lttpr_count(dp->link->lttpr_common_caps));
if (rc)
DRM_ERROR("failed to set LTTPRs transparency mode, rc=%d\n", rc);
}

3
drivers/gpu/drm/msm/dp/dp_link.h
View File

@ -7,6 +7,7 @@
#define _DP_LINK_H_
#include "dp_aux.h"
#include <drm/display/drm_dp_helper.h>
#define DS_PORT_STATUS_CHANGED 0x200
#define DP_TEST_BIT_DEPTH_UNKNOWN 0xFFFFFFFF
@ -60,6 +61,8 @@ struct msm_dp_link_phy_params {
};
struct msm_dp_link {
u8 lttpr_common_caps[DP_LTTPR_COMMON_CAP_SIZE];
u32 sink_request;
u32 test_response;

12
drivers/gpu/drm/msm/dp/dp_panel.c
View File

@ -47,7 +47,7 @@ static void msm_dp_panel_read_psr_cap(struct msm_dp_panel_private *panel)
static int msm_dp_panel_read_dpcd(struct msm_dp_panel *msm_dp_panel)
{
int rc;
int rc, max_lttpr_lanes, max_lttpr_rate;
struct msm_dp_panel_private *panel;
struct msm_dp_link_info *link_info;
u8 *dpcd, major, minor;
@ -75,6 +75,16 @@ static int msm_dp_panel_read_dpcd(struct msm_dp_panel *msm_dp_panel)
if (link_info->rate > msm_dp_panel->max_dp_link_rate)
link_info->rate = msm_dp_panel->max_dp_link_rate;
/* Limit data lanes from LTTPR capabilities, if any */
max_lttpr_lanes = drm_dp_lttpr_max_lane_count(panel->link->lttpr_common_caps);
if (max_lttpr_lanes && max_lttpr_lanes < link_info->num_lanes)
link_info->num_lanes = max_lttpr_lanes;
/* Limit link rate from LTTPR capabilities, if any */
max_lttpr_rate = drm_dp_lttpr_max_link_rate(panel->link->lttpr_common_caps);
if (max_lttpr_rate && max_lttpr_rate < link_info->rate)
link_info->rate = max_lttpr_rate;
drm_dbg_dp(panel->drm_dev, "version: %d.%d\n", major, minor);
drm_dbg_dp(panel->drm_dev, "link_rate=%d\n", link_info->rate);
drm_dbg_dp(panel->drm_dev, "lane_count=%d\n", link_info->num_lanes);