lkml.org 
[lkml]   [2022]   [Nov]   [30]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH v6 4/4] drm/msm/dp: add support of max dp link rate
Date
By default, HBR2 (5.4G) is the max link link be supported. This patch add
the capability to support max link rate at HBR3 (8.1G).

Changes in v2:
-- add max link rate from dtsi

Changes in v3:
-- parser max_data_lanes and max_dp_link_rate from dp_out endpoint

Changes in v4:
-- delete unnecessary pr_err

Changes in v5:
-- split parser function into different patch

Signed-off-by: Kuogee Hsieh <quic_khsieh@quicinc.com>
Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
---
drivers/gpu/drm/msm/dp/dp_display.c | 4 ++++
drivers/gpu/drm/msm/dp/dp_panel.c | 7 ++++---
drivers/gpu/drm/msm/dp/dp_panel.h | 1 +
3 files changed, 9 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/msm/dp/dp_display.c b/drivers/gpu/drm/msm/dp/dp_display.c
index 29c9845..4fe2092 100644
--- a/drivers/gpu/drm/msm/dp/dp_display.c
+++ b/drivers/gpu/drm/msm/dp/dp_display.c
@@ -390,6 +390,10 @@ static int dp_display_process_hpd_high(struct dp_display_private *dp)
struct edid *edid;

dp->panel->max_dp_lanes = dp->parser->max_dp_lanes;
+ dp->panel->max_dp_link_rate = dp->parser->max_dp_link_rate;
+
+ drm_dbg_dp(dp->drm_dev, "max_lanes=%d max_link_rate=%d\n",
+ dp->panel->max_dp_lanes, dp->panel->max_dp_link_rate);

rc = dp_panel_read_sink_caps(dp->panel, dp->dp_display.connector);
if (rc)
diff --git a/drivers/gpu/drm/msm/dp/dp_panel.c b/drivers/gpu/drm/msm/dp/dp_panel.c
index 5149ceb..933fa9c 100644
--- a/drivers/gpu/drm/msm/dp/dp_panel.c
+++ b/drivers/gpu/drm/msm/dp/dp_panel.c
@@ -75,12 +75,13 @@ static int dp_panel_read_dpcd(struct dp_panel *dp_panel)
link_info->rate = drm_dp_bw_code_to_link_rate(dpcd[DP_MAX_LINK_RATE]);
link_info->num_lanes = dpcd[DP_MAX_LANE_COUNT] & DP_MAX_LANE_COUNT_MASK;

+ /* Limit data lanes from data-lanes of endpoint properity of dtsi */
if (link_info->num_lanes > dp_panel->max_dp_lanes)
link_info->num_lanes = dp_panel->max_dp_lanes;

- /* Limit support upto HBR2 until HBR3 support is added */
- if (link_info->rate >= (drm_dp_bw_code_to_link_rate(DP_LINK_BW_5_4)))
- link_info->rate = drm_dp_bw_code_to_link_rate(DP_LINK_BW_5_4);
+ /* Limit link rate from link-frequencies of endpoint properity of dtsi */
+ if (link_info->rate > dp_panel->max_dp_link_rate)
+ link_info->rate = dp_panel->max_dp_link_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);
diff --git a/drivers/gpu/drm/msm/dp/dp_panel.h b/drivers/gpu/drm/msm/dp/dp_panel.h
index d861197a..f04d021 100644
--- a/drivers/gpu/drm/msm/dp/dp_panel.h
+++ b/drivers/gpu/drm/msm/dp/dp_panel.h
@@ -50,6 +50,7 @@ struct dp_panel {

u32 vic;
u32 max_dp_lanes;
+ u32 max_dp_link_rate;

u32 max_bw_code;
};
--
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
a Linux Foundation Collaborative Project
\
 
 \ /
  Last update: 2022-12-01 00:53    [W:0.072 / U:1.512 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site