[PATCH v15 0/5] Add data-lanes and link-frequencies to dp_out endpoint

[PATCH v15 0/5] Add data-lanes and link-frequencies to dp_out endpoint

[Kuogee Hsieh]

Add DP both data-lanes and link-frequencies property to dp_out endpoint and support
functions to DP driver.

Kuogee Hsieh (5):
  arm64: dts: qcom: add data-lanes and link-freuencies into dp_out
    endpoint
  dt-bindings: msm/dp: add data-lanes and link-frequencies property
  drm/msm/dp: parse data-lanes 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.
  drm/msm/dp: add support of max dp link rate

 .../bindings/display/msm/dp-controller.yaml        | 25 ++++++++++-
 arch/arm64/boot/dts/qcom/sc7180-trogdor.dtsi       |  4 ++
 arch/arm64/boot/dts/qcom/sc7280-herobrine.dtsi     |  4 ++
 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 +
 drivers/gpu/drm/msm/dp/dp_parser.c                 | 50 ++++++++++++++++++----
 drivers/gpu/drm/msm/dp/dp_parser.h                 |  2 +
 8 files changed, 85 insertions(+), 12 deletions(-)

-- 
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
a Linux Foundation Collaborative Project

[PATCH v15 1/5] arm64: dts: qcom: add data-lanes and link-freuencies into dp_out endpoint

[Kuogee Hsieh]

Move data-lanes property from mdss_dp node to dp_out endpoint. Also
add link-frequencies property into dp_out endpoint as well. The last
frequency specified at link-frequencies will be the max link rate
supported by DP.

Changes in v5:
-- revert changes at sc7180.dtsi and sc7280.dtsi
-- add &dp_out to sc7180-trogdor.dtsi and sc7280-herobrine.dtsi

Changes in v6:
-- add data-lanes and link-frequencies to yaml

Changes in v7:
-- change 160000000 to 1620000000
-- separate yaml to different patch

Changes in v8:
-- correct Bjorn mail address to kernel.org

Changes in v9:
-- use symbol rate (hz) for link-frequencies at dp_out at sc7180_trogdor.dtsi

Changes in v13:
-- delete an extra space at data-lanes

Changes in v15:
-- replace space with tab at sc7180-trogdor.dtsi

Signed-off-by: Kuogee Hsieh <quic_khsieh@quicinc.com>
---
 arch/arm64/boot/dts/qcom/sc7180-trogdor.dtsi   | 4 ++++
 arch/arm64/boot/dts/qcom/sc7280-herobrine.dtsi | 4 ++++
 2 files changed, 8 insertions(+)

diff --git a/arch/arm64/boot/dts/qcom/sc7180-trogdor.dtsi b/arch/arm64/boot/dts/qcom/sc7180-trogdor.dtsi
index eae22e6..ad98a87 100644
--- a/arch/arm64/boot/dts/qcom/sc7180-trogdor.dtsi
+++ b/arch/arm64/boot/dts/qcom/sc7180-trogdor.dtsi
@@ -814,7 +814,11 @@ hp_i2c: &i2c9 {
 	status = "okay";
 	pinctrl-names = "default";
 	pinctrl-0 = <&dp_hot_plug_det>;
+};
+
+&dp_out {
 	data-lanes = <0 1>;
+	link-frequencies = /bits/ 64 <1620000000 2700000000 5400000000>;
 };
 
 &pm6150_adc {
diff --git a/arch/arm64/boot/dts/qcom/sc7280-herobrine.dtsi b/arch/arm64/boot/dts/qcom/sc7280-herobrine.dtsi
index c11e371..3f363f8 100644
--- a/arch/arm64/boot/dts/qcom/sc7280-herobrine.dtsi
+++ b/arch/arm64/boot/dts/qcom/sc7280-herobrine.dtsi
@@ -442,7 +442,11 @@ ap_i2c_tpm: &i2c14 {
 	status = "okay";
 	pinctrl-names = "default";
 	pinctrl-0 = <&dp_hot_plug_det>;
+};
+
+&dp_out {
 	data-lanes = <0 1>;
+	link-frequencies = /bits/ 64 <1620000000 2700000000 5400000000 8100000000>;
 };
 
 &mdss_mdp {
-- 
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
a Linux Foundation Collaborative Project

[PATCH v15 2/5] dt-bindings: msm/dp: add data-lanes and link-frequencies property

[Kuogee Hsieh]

To increase the flexibility of supporting different DP main link configuration
at different platform, add both data-lanes and link-frequencies property
into endpoint so that different platform can specify its own main link
combination of both data lanes and max supported link rate.

Changes in v7:
-- split yaml out of dtsi patch
-- link-frequencies from link rate to symbol rate
-- deprecation of old data-lanes property

Changes in v8:
-- correct Bjorn mail address to kernel.org

Changes in v10:
-- add menu item to data-lanes and link-frequecnis

Changes in v11:
-- add endpoint property at port@1

Changes in v12:
-- use enum for item at data-lanes and link-frequencies

Changes in v13:
-- revised changes at port@0
-- use correct ref schemas for both port@0 and port@1
-- mark both port@0 and port@1 are required
-- add line between data-lanes and link-frequencies properties

Changes in v14:
-- add "unevaluatedProperties: false: to endpoint at port@1
-- remove unnecessary quote to $ref
-- re store "$ref: /schemas/graph.yaml#/properties/port" to port@0

Changes in v15:
-- re store desciption of port@0

Signed-off-by: Kuogee Hsieh <quic_khsieh@quicinc.com>
---
 .../bindings/display/msm/dp-controller.yaml        | 25 +++++++++++++++++++++-
 1 file changed, 24 insertions(+), 1 deletion(-)

diff --git a/Documentation/devicetree/bindings/display/msm/dp-controller.yaml b/Documentation/devicetree/bindings/display/msm/dp-controller.yaml
index f2515af..774ccb5 100644
--- a/Documentation/devicetree/bindings/display/msm/dp-controller.yaml
+++ b/Documentation/devicetree/bindings/display/msm/dp-controller.yaml
@@ -81,6 +81,7 @@ properties:
 
   data-lanes:
     $ref: /schemas/types.yaml#/definitions/uint32-array
+    deprecated: true
     minItems: 1
     maxItems: 4
     items:
@@ -102,8 +103,28 @@ properties:
         description: Input endpoint of the controller
 
       port@1:
-        $ref: /schemas/graph.yaml#/properties/port
+        $ref: /schemas/graph.yaml#/$defs/port-base
         description: Output endpoint of the controller
+        properties:
+          endpoint:
+            $ref: /schemas/media/video-interfaces.yaml#
+            unevaluatedProperties: false
+            properties:
+              data-lanes:
+                minItems: 1
+                maxItems: 4
+                items:
+                  enum: [ 0, 1, 2, 3 ]
+
+              link-frequencies:
+                minItems: 1
+                maxItems: 4
+                items:
+                  enum: [ 1620000000, 2700000000, 5400000000, 8100000000 ]
+
+    required:
+      - port@0
+      - port@1
 
 required:
   - compatible
@@ -193,6 +214,8 @@ examples:
                 reg = <1>;
                 endpoint {
                     remote-endpoint = <&typec>;
+                    data-lanes = <0 1>;
+                    link-frequencies = /bits/ 64 <1620000000 2700000000 5400000000 8100000000>;
                 };
             };
         };
-- 
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
a Linux Foundation Collaborative Project

[PATCH v15 3/5] drm/msm/dp: parse data-lanes as property of dp_out endpoint

[Kuogee Hsieh]

Add capability to parser data-lanes as property of dp_out endpoint.
Also retain the original capability to parser data-lanes as property
of mdss_dp node to handle legacy case.

Changes in v6:
-- first patch after split parser patch into two

Changes in v7:
-- check "data-lanes" from endpoint first

Changes in v14:
-- replace "parser" with "parse" at commit subject
-- add matching brackets at dp_parser_misc()

Changes in v15:
-- concise dp_parser_misc()

Signed-off-by: Kuogee Hsieh <quic_khsieh@quicinc.com>
Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
---
 drivers/gpu/drm/msm/dp/dp_parser.c | 22 ++++++++++++++--------
 1 file changed, 14 insertions(+), 8 deletions(-)

diff --git a/drivers/gpu/drm/msm/dp/dp_parser.c b/drivers/gpu/drm/msm/dp/dp_parser.c
index dd73221..e3ba322 100644
--- a/drivers/gpu/drm/msm/dp/dp_parser.c
+++ b/drivers/gpu/drm/msm/dp/dp_parser.c
@@ -94,16 +94,22 @@ 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;
-	int len;
-
-	len = drm_of_get_data_lanes_count(of_node, 1, DP_MAX_NUM_DP_LANES);
-	if (len < 0) {
-		DRM_WARN("Invalid property \"data-lanes\", default max DP lanes = %d\n",
-			 DP_MAX_NUM_DP_LANES);
-		len = DP_MAX_NUM_DP_LANES;
+	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) {
+		/* legacy code, data-lanes is the property of mdss_dp node */
+		cnt = drm_of_get_data_lanes_count(of_node, 1, DP_MAX_NUM_DP_LANES);
 	}
 
-	parser->max_dp_lanes = len;
+	if (cnt > 0)
+		parser->max_dp_lanes = cnt;
+	else
+		parser->max_dp_lanes = DP_MAX_NUM_DP_LANES; /* 4 lanes */
+
 	return 0;
 }
 
-- 
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
a Linux Foundation Collaborative Project

[PATCH v15 4/5] Add capability to parser and retrieve max DP link supported rate from link-frequencies property of dp_out endpoint.

[Kuogee Hsieh]

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

Changes in v9:
-- separate parser link-frequencies out of data-lanes

Changes in v10:
-- add dp_parser_link_frequencies()

Changes in v11:
-- return 0 if(!endpoint)

Changes in v12:
-- replace khz with kbytes at dp_parser.h

Changes in v14:
-- replace "parser" with "parse" at commit subject
-- use do_div() for 64 bits division

Signed-off-by: Kuogee Hsieh <quic_khsieh@quicinc.com>
Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
---
 drivers/gpu/drm/msm/dp/dp_parser.c | 28 ++++++++++++++++++++++++++++
 drivers/gpu/drm/msm/dp/dp_parser.h |  2 ++
 2 files changed, 30 insertions(+)

diff --git a/drivers/gpu/drm/msm/dp/dp_parser.c b/drivers/gpu/drm/msm/dp/dp_parser.c
index e3ba322..42c0793 100644
--- a/drivers/gpu/drm/msm/dp/dp_parser.c
+++ b/drivers/gpu/drm/msm/dp/dp_parser.c
@@ -91,6 +91,30 @@ static int dp_parser_ctrl_res(struct dp_parser *parser)
 	return 0;
 }
 
+static u32 dp_parser_link_frequencies(struct device_node *of_node)
+{
+	struct device_node *endpoint;
+	u64 frequency = 0;
+	int cnt;
+
+	endpoint = of_graph_get_endpoint_by_regs(of_node, 1, 0); /* port@1 */
+	if (!endpoint)
+		return 0;
+
+	cnt = of_property_count_u64_elems(endpoint, "link-frequencies");
+
+	if (cnt > 0)
+		of_property_read_u64_index(endpoint, "link-frequencies",
+						cnt - 1, &frequency);
+	of_node_put(endpoint);
+
+	do_div(frequency,
+		10 * /* from symbol rate to link rate */
+		1000); /* kbytes */
+
+	return frequency;
+}
+
 static int dp_parser_misc(struct dp_parser *parser)
 {
 	struct device_node *of_node = parser->pdev->dev.of_node;
@@ -110,6 +134,10 @@ static int dp_parser_misc(struct dp_parser *parser)
 	else
 		parser->max_dp_lanes = DP_MAX_NUM_DP_LANES; /* 4 lanes */
 
+	parser->max_dp_link_rate = dp_parser_link_frequencies(of_node);
+	if (!parser->max_dp_link_rate)
+		parser->max_dp_link_rate = DP_LINK_RATE_HBR2;
+
 	return 0;
 }
 
diff --git a/drivers/gpu/drm/msm/dp/dp_parser.h b/drivers/gpu/drm/msm/dp/dp_parser.h
index 866c1a8..526131ee 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 /* kbytes */
 
 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);
-- 
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
a Linux Foundation Collaborative Project

[PATCH v15 5/5] drm/msm/dp: add support of max dp link rate

[Kuogee Hsieh]

By default, HBR2 (5.4G) is the max link rate be supported. This patch
uses the actual limit specified by DT and removes the artificial
limitation to 5.4 Gbps. Supporting HBR3 is a consequence of that.

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

Changes in v9:
-- revised commit test

Changes in v13:
-- repalced "properity" with "property"

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 bfd0aef..edee550 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..1800d89 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 property 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 property 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

Re: [PATCH v15 2/5] dt-bindings: msm/dp: add data-lanes and link-frequencies property

[Rob Herring]

On Fri, 16 Dec 2022 13:44:59 -0800, Kuogee Hsieh wrote:
> To increase the flexibility of supporting different DP main link configuration
> at different platform, add both data-lanes and link-frequencies property
> into endpoint so that different platform can specify its own main link
> combination of both data lanes and max supported link rate.
> 
> Changes in v7:
> -- split yaml out of dtsi patch
> -- link-frequencies from link rate to symbol rate
> -- deprecation of old data-lanes property
> 
> Changes in v8:
> -- correct Bjorn mail address to kernel.org
> 
> Changes in v10:
> -- add menu item to data-lanes and link-frequecnis
> 
> Changes in v11:
> -- add endpoint property at port@1
> 
> Changes in v12:
> -- use enum for item at data-lanes and link-frequencies
> 
> Changes in v13:
> -- revised changes at port@0
> -- use correct ref schemas for both port@0 and port@1
> -- mark both port@0 and port@1 are required
> -- add line between data-lanes and link-frequencies properties
> 
> Changes in v14:
> -- add "unevaluatedProperties: false: to endpoint at port@1
> -- remove unnecessary quote to $ref
> -- re store "$ref: /schemas/graph.yaml#/properties/port" to port@0
> 
> Changes in v15:
> -- re store desciption of port@0
> 
> Signed-off-by: Kuogee Hsieh <quic_khsieh@quicinc.com>
> ---
>  .../bindings/display/msm/dp-controller.yaml        | 25 +++++++++++++++++++++-
>  1 file changed, 24 insertions(+), 1 deletion(-)
> 

Reviewed-by: Rob Herring <robh@kernel.org>

Re: [PATCH v15 1/5] arm64: dts: qcom: add data-lanes and link-freuencies into dp_out endpoint

[Krzysztof Kozlowski]

On 16/12/2022 22:44, Kuogee Hsieh wrote:
> Move data-lanes property from mdss_dp node to dp_out endpoint. Also
> add link-frequencies property into dp_out endpoint as well. The last
> frequency specified at link-frequencies will be the max link rate
> supported by DP.
> 
> Changes in v5:
> -- revert changes at sc7180.dtsi and sc7280.dtsi
> -- add &dp_out to sc7180-trogdor.dtsi and sc7280-herobrine.dtsi
> 
> Changes in v6:
> -- add data-lanes and link-frequencies to yaml
> 
> Changes in v7:
> -- change 160000000 to 1620000000
> -- separate yaml to different patch
> 
> Changes in v8:
> -- correct Bjorn mail address to kernel.org
> 
> Changes in v9:
> -- use symbol rate (hz) for link-frequencies at dp_out at sc7180_trogdor.dtsi
> 
> Changes in v13:
> -- delete an extra space at data-lanes
> 
> Changes in v15:
> -- replace space with tab at sc7180-trogdor.dtsi
> 
> Signed-off-by: Kuogee Hsieh <quic_khsieh@quicinc.com>
> ---
>  arch/arm64/boot/dts/qcom/sc7180-trogdor.dtsi   | 4 ++++
>  arch/arm64/boot/dts/qcom/sc7280-herobrine.dtsi | 4 ++++
>  2 files changed, 8 insertions(+)
> 
> diff --git a/arch/arm64/boot/dts/qcom/sc7180-trogdor.dtsi b/arch/arm64/boot/dts/qcom/sc7180-trogdor.dtsi
> index eae22e6..ad98a87 100644
> --- a/arch/arm64/boot/dts/qcom/sc7180-trogdor.dtsi
> +++ b/arch/arm64/boot/dts/qcom/sc7180-trogdor.dtsi
> @@ -814,7 +814,11 @@ hp_i2c: &i2c9 {
>  	status = "okay";
>  	pinctrl-names = "default";
>  	pinctrl-0 = <&dp_hot_plug_det>;
> +};
> +
> +&dp_out {

Still wrong order, I think.


Best regards,
Krzysztof