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Message-ID: <1669933404-13766-1-git-send-email-quic_khsieh@quicinc.com>
Date: Thu, 1 Dec 2022 14:23:24 -0800
From: Kuogee Hsieh <quic_khsieh@...cinc.com>
To: <robdclark@...il.com>, <sean@...rly.run>, <swboyd@...omium.org>,
<dianders@...omium.org>, <vkoul@...nel.org>, <daniel@...ll.ch>,
<airlied@...ux.ie>, <agross@...nel.org>,
<dmitry.baryshkov@...aro.org>, <bjorn.andersson@...aro.org>
CC: <quic_abhinavk@...cinc.com>, <quic_khsieh@...cinc.com>,
<quic_sbillaka@...cinc.com>, <freedreno@...ts.freedesktop.org>,
<dri-devel@...ts.freedesktop.org>, <linux-arm-msm@...r.kernel.org>,
<linux-kernel@...r.kernel.org>
Subject: [PATCH v7 4/5] drm/msm/dp: parser link-frequencies as property of dp_out endpoint
Add capability to parser and retrieve max DP link supported rate from
link-frequencies property of dp_out endpoint.
Changes in v6:
-- second patch after split parser patch into two patches
Changes in v7:
-- without checking cnt against DP_MAX_NUM_DP_LANES to retrieve link rate
Signed-off-by: Kuogee Hsieh <quic_khsieh@...cinc.com>
---
drivers/gpu/drm/msm/dp/dp_parser.c | 19 +++++++++++++++++--
drivers/gpu/drm/msm/dp/dp_parser.h | 2 ++
2 files changed, 19 insertions(+), 2 deletions(-)
diff --git a/drivers/gpu/drm/msm/dp/dp_parser.c b/drivers/gpu/drm/msm/dp/dp_parser.c
index b5f7e70..037dad8 100644
--- a/drivers/gpu/drm/msm/dp/dp_parser.c
+++ b/drivers/gpu/drm/msm/dp/dp_parser.c
@@ -94,15 +94,28 @@ static int dp_parser_ctrl_res(struct dp_parser *parser)
static int dp_parser_misc(struct dp_parser *parser)
{
struct device_node *of_node = parser->pdev->dev.of_node;
+ struct device_node *endpoint;
+ u64 frequency;
int cnt;
/*
* data-lanes is the property of dp_out endpoint
*/
cnt = drm_of_get_data_lanes_count_ep(of_node, 1, 0, 1, DP_MAX_NUM_DP_LANES);
- if (cnt > 0)
+ if (cnt > 0) {
parser->max_dp_lanes = cnt;
- else {
+
+ endpoint = of_graph_get_endpoint_by_regs(of_node, 1, 0); /* port@1 */
+ cnt = of_property_count_u64_elems(endpoint, "link-frequencies");
+ if (cnt > 0) {
+ of_property_read_u64_index(endpoint, "link-frequencies",
+ cnt - 1, &frequency);
+ frequency /= 10; /* from symbol rate to link rate */
+ parser->max_dp_link_rate = (frequency / 1000); /* kbits */
+ } else {
+ parser->max_dp_link_rate = DP_LINK_RATE_HBR2; /* 540000 khz */
+ }
+ } else {
/*
* legacy code, data-lanes is the property of mdss_dp node
*/
@@ -111,6 +124,8 @@ static int dp_parser_misc(struct dp_parser *parser)
parser->max_dp_lanes = cnt;
else
parser->max_dp_lanes = DP_MAX_NUM_DP_LANES; /* 4 lanes */
+
+ parser->max_dp_link_rate = DP_LINK_RATE_HBR2; /* 540000 khz */
}
return 0;
diff --git a/drivers/gpu/drm/msm/dp/dp_parser.h b/drivers/gpu/drm/msm/dp/dp_parser.h
index 866c1a8..3ddf639 100644
--- a/drivers/gpu/drm/msm/dp/dp_parser.h
+++ b/drivers/gpu/drm/msm/dp/dp_parser.h
@@ -15,6 +15,7 @@
#define DP_LABEL "MDSS DP DISPLAY"
#define DP_MAX_PIXEL_CLK_KHZ 675000
#define DP_MAX_NUM_DP_LANES 4
+#define DP_LINK_RATE_HBR2 540000
enum dp_pm_type {
DP_CORE_PM,
@@ -119,6 +120,7 @@ struct dp_parser {
struct dp_io io;
struct dp_display_data disp_data;
u32 max_dp_lanes;
+ u32 max_dp_link_rate;
struct drm_bridge *next_bridge;
int (*parse)(struct dp_parser *parser);
--
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