[PATCH v13 0/7] drm/sun4i: Allwinner A64 MIPI-DSI support

[PATCH v13 0/7] drm/sun4i: Allwinner A64 MIPI-DSI support

[Jagan Teki]

This is v13 version for Allwinner A64 MIPI-DSI support
and here is the previous version set[1]

Changes for v13:
- update dt-bindings for A64
- drop has_mod_clk variant
- use regmap bus clock properly
Changes for v12:
- use enum insted of oneOf+const
- handle bus clock using regmap attach clk
- tested on A64, A33 boards.
Changes for v11:
- fix dt-bindings for dphy
- fix dt-bindings for dsi controller
- add bus clock handling code
- tested on A64, A33 boards.
Changes for v10:
- updated dt-bindings as per .yaml format
- rebased on drm-misc/for-linux-next
Changes for v9:
- moved dsi fixes in separate series on top of A33
- rebase on linux-next
Changes for v8:
- rebased on drm-misc change along with linux-next
- reworked video start delay patch
- tested on 4 different dsi panels
- reworked commit messages
Changes for v7:
- moved vcc-dsi binding to required filed.
- drop quotes on fallback dphy bindings.
- drop min_rate clock pll-mipi patches.
- introduce dclk divider computation as like A64 BSP.
- add A64 DSI quark patches.
- fixed A64 DSI pipeline.
- add proper commit messages.
- collect Merlijn Wajer Tested-by credits.
Changes for v6:
- dropped unneeded changes, patches
- fixed all burst mode patches as per previous version comments
- rebase on master
- update proper commit message
- dropped unneeded comments
- order the patches that make review easy
Changes for v5:
- collect Rob, Acked-by
- droped "Fix VBP size calculation" patch
- updated vblk timing calculation.
- droped techstar, bananapi dsi panel drivers which may require
  bridge or other setup. it's under discussion.
Changes for v4:
- droppoed untested CCU_FEATURE_FIXED_POSTDIV check code in
  nkm min, max rate patches
- create two patches for "Add Allwinner A64 MIPI DSI support"
  one for has_mod_clk quirk and other one for A64 support
- use existing driver code construct for hblk computation
- dropped "Increase hfp packet overhead" patch [2], though BSP added
  this but we have no issues as of now.
  (no issues on panel side w/o this change)
- create separate function for vblk computation 
- enable vcc-dsi regulator in dsi_runtime_resume
- collect Rob, Acked-by
- update MAINTAINERS file for panel drivers
- cleanup commit messages
- fixed checkpatch warnings/errors

[1] https://patchwork.freedesktop.org/series/70361/

Any inputs?
Jagan.

Jagan Teki (7):
  dt-bindings: sun6i-dsi: Document A64 MIPI-DSI controller
  dt-bindings: sun6i-dsi: Add A64 DPHY compatible (w/ A31 fallback)
  drm/sun4i: dsi: Get the mod clock for A31
  drm/sun4i: dsi: Handle bus clock via regmap_mmio_attach_clk
  drm/sun4i: dsi: Add Allwinner A64 MIPI DSI support
  arm64: dts: allwinner: a64: Add MIPI DSI pipeline
  [DO NOT MERGE] arm64: dts: allwinner: bananapi-m64: Enable Bananapi S070WV20-CT16 DSI
    panel

 .../display/allwinner,sun6i-a31-mipi-dsi.yaml | 33 ++++++++++-
 .../phy/allwinner,sun6i-a31-mipi-dphy.yaml    |  6 +-
 .../dts/allwinner/sun50i-a64-bananapi-m64.dts | 31 +++++++++++
 arch/arm64/boot/dts/allwinner/sun50i-a64.dtsi | 37 +++++++++++++
 drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c        | 55 +++++++++++++++----
 5 files changed, 148 insertions(+), 14 deletions(-)

-- 
2.18.0.321.gffc6fa0e3

[PATCH v13 1/7] dt-bindings: sun6i-dsi: Document A64 MIPI-DSI controller

[Jagan Teki]

The MIPI DSI controller in Allwinner A64 is similar to A33.

But unlike A33, A64 doesn't have DSI_SCLK gating so it is valid
to have separate compatible for A64 on the same driver.

DSI_SCLK uses mod clock-names on dt-bindings, so the same
is not required for A64.

On that note
- A64 require minimum of 1 clock like the bus clock
- A33 require minimum of 2 clocks like both bus, mod clocks

So, update dt-bindings so-that it can document both A33,
A64 bindings requirements.

Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: Jagan Teki <jagan@amarulasolutions.com>
---
Changes for v13:
- Add if statement for A64 with single clock

 .../display/allwinner,sun6i-a31-mipi-dsi.yaml | 33 +++++++++++++++++--
 1 file changed, 31 insertions(+), 2 deletions(-)

diff --git a/Documentation/devicetree/bindings/display/allwinner,sun6i-a31-mipi-dsi.yaml b/Documentation/devicetree/bindings/display/allwinner,sun6i-a31-mipi-dsi.yaml
index dafc0980c4fa..d41ecb5e7f7c 100644
--- a/Documentation/devicetree/bindings/display/allwinner,sun6i-a31-mipi-dsi.yaml
+++ b/Documentation/devicetree/bindings/display/allwinner,sun6i-a31-mipi-dsi.yaml
@@ -15,7 +15,9 @@ properties:
   "#size-cells": true
 
   compatible:
-    const: allwinner,sun6i-a31-mipi-dsi
+    enum:
+      - allwinner,sun6i-a31-mipi-dsi
+      - allwinner,sun50i-a64-mipi-dsi
 
   reg:
     maxItems: 1
@@ -24,6 +26,8 @@ properties:
     maxItems: 1
 
   clocks:
+    minItems: 1
+    maxItems: 2
     items:
       - description: Bus Clock
       - description: Module Clock
@@ -63,13 +67,38 @@ required:
   - reg
   - interrupts
   - clocks
-  - clock-names
   - phys
   - phy-names
   - resets
   - vcc-dsi-supply
   - port
 
+allOf:
+  - if:
+      properties:
+         compatible:
+           contains:
+             const: allwinner,sun6i-a31-mipi-dsi
+
+    then:
+        properties:
+          clocks:
+            minItems: 2
+
+        required:
+          - clock-names
+
+  - if:
+      properties:
+         compatible:
+           contains:
+             const: allwinner,sun50i-a64-mipi-dsi
+
+    then:
+        properties:
+          clocks:
+            minItems: 1
+
 additionalProperties: false
 
 examples:
-- 
2.18.0.321.gffc6fa0e3

[PATCH v13 2/7] dt-bindings: sun6i-dsi: Add A64 DPHY compatible (w/ A31 fallback)

[Jagan Teki]

The MIPI DSI PHY controller on Allwinner A64 is similar
on the one on A31.

Add A64 compatible and append A31 compatible as fallback.

Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: Jagan Teki <jagan@amarulasolutions.com>
---
Changes for v13:
- collect Rob review tag

 .../bindings/phy/allwinner,sun6i-a31-mipi-dphy.yaml         | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/Documentation/devicetree/bindings/phy/allwinner,sun6i-a31-mipi-dphy.yaml b/Documentation/devicetree/bindings/phy/allwinner,sun6i-a31-mipi-dphy.yaml
index fa46670de299..8841938050b2 100644
--- a/Documentation/devicetree/bindings/phy/allwinner,sun6i-a31-mipi-dphy.yaml
+++ b/Documentation/devicetree/bindings/phy/allwinner,sun6i-a31-mipi-dphy.yaml
@@ -15,7 +15,11 @@ properties:
     const: 0
 
   compatible:
-    const: allwinner,sun6i-a31-mipi-dphy
+    oneOf:
+      - const: allwinner,sun6i-a31-mipi-dphy
+      - items:
+          - const: allwinner,sun50i-a64-mipi-dphy
+          - const: allwinner,sun6i-a31-mipi-dphy
 
   reg:
     maxItems: 1
-- 
2.18.0.321.gffc6fa0e3

[PATCH v13 3/7] drm/sun4i: dsi: Get the mod clock for A31

[Jagan Teki]

As per the user manual, look like mod clock is not mandatory
for all Allwinner MIPI DSI controllers, it is connected to
CLK_DSI_SCLK for A31 and not available in A64.

So, add compatible check for A31 and get mod clock accordingly.

Tested-by: Merlijn Wajer <merlijn@wizzup.org>
Signed-off-by: Jagan Teki <jagan@amarulasolutions.com>
---
Changes for v13:
- Drop has_mod_clk quirk as commented by Chen-Yu

 drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c | 11 +++++++----
 1 file changed, 7 insertions(+), 4 deletions(-)

diff --git a/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c b/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c
index c958ca9bae63..68b88a3dc4c5 100644
--- a/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c
+++ b/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c
@@ -1120,10 +1120,13 @@ static int sun6i_dsi_probe(struct platform_device *pdev)
 		return PTR_ERR(dsi->reset);
 	}
 
-	dsi->mod_clk = devm_clk_get(dev, "mod");
-	if (IS_ERR(dsi->mod_clk)) {
-		dev_err(dev, "Couldn't get the DSI mod clock\n");
-		return PTR_ERR(dsi->mod_clk);
+	if (of_device_is_compatible(dev->of_node,
+				    "allwinner,sun6i-a31-mipi-dsi")) {
+		dsi->mod_clk = devm_clk_get(dev, "mod");
+		if (IS_ERR(dsi->mod_clk)) {
+			dev_err(dev, "Couldn't get the DSI mod clock\n");
+			return PTR_ERR(dsi->mod_clk);
+		}
 	}
 
 	/*
-- 
2.18.0.321.gffc6fa0e3

[PATCH v13 4/7] drm/sun4i: dsi: Handle bus clock via regmap_mmio_attach_clk

[Jagan Teki]

regmap has special API to enable the controller bus clock while
initializing register space, and current driver is using
devm_regmap_init_mmio_clk which require to specify bus
clk_id argument as "bus"

But, the usage of clocks are varies between different Allwinner
DSI controllers. Clocking in A33 would need bus and mod clocks
where as A64 would need only bus clock.

Since A64 support only single bus clock, it is optional to
specify the clock-names on the controller device tree node.
So using NULL on clk_id would get the attached clock.

To support clk_id as "bus" and "NULL" during clock enablement
between controllers, this patch add generic code to handle
the bus clock using regmap_mmio_attach_clk with associated
regmap APIs.

Signed-off-by: Jagan Teki <jagan@amarulasolutions.com>
---
Changes for v13:
- update the changes since has_mod_clk is dropped in previous patch

 drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c | 45 +++++++++++++++++++++-----
 1 file changed, 37 insertions(+), 8 deletions(-)

diff --git a/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c b/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c
index 68b88a3dc4c5..de8955fbeb00 100644
--- a/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c
+++ b/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c
@@ -1081,6 +1081,7 @@ static const struct component_ops sun6i_dsi_ops = {
 static int sun6i_dsi_probe(struct platform_device *pdev)
 {
 	struct device *dev = &pdev->dev;
+	const char *bus_clk_name = NULL;
 	struct sun6i_dsi *dsi;
 	struct resource *res;
 	void __iomem *base;
@@ -1094,6 +1095,10 @@ static int sun6i_dsi_probe(struct platform_device *pdev)
 	dsi->host.ops = &sun6i_dsi_host_ops;
 	dsi->host.dev = dev;
 
+	if (of_device_is_compatible(dev->of_node,
+				    "allwinner,sun6i-a31-mipi-dsi"))
+		bus_clk_name = "bus";
+
 	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 	base = devm_ioremap_resource(dev, res);
 	if (IS_ERR(base)) {
@@ -1107,25 +1112,36 @@ static int sun6i_dsi_probe(struct platform_device *pdev)
 		return PTR_ERR(dsi->regulator);
 	}
 
-	dsi->regs = devm_regmap_init_mmio_clk(dev, "bus", base,
-					      &sun6i_dsi_regmap_config);
-	if (IS_ERR(dsi->regs)) {
-		dev_err(dev, "Couldn't create the DSI encoder regmap\n");
-		return PTR_ERR(dsi->regs);
-	}
-
 	dsi->reset = devm_reset_control_get_shared(dev, NULL);
 	if (IS_ERR(dsi->reset)) {
 		dev_err(dev, "Couldn't get our reset line\n");
 		return PTR_ERR(dsi->reset);
 	}
 
+	dsi->regs = devm_regmap_init_mmio(dev, base, &sun6i_dsi_regmap_config);
+	if (IS_ERR(dsi->regs)) {
+		dev_err(dev, "Couldn't init regmap\n");
+		return PTR_ERR(dsi->regs);
+	}
+
+	dsi->bus_clk = devm_clk_get(dev, bus_clk_name);
+	if (IS_ERR(dsi->bus_clk)) {
+		dev_err(dev, "Couldn't get the DSI bus clock\n");
+		ret = PTR_ERR(dsi->bus_clk);
+		goto err_regmap;
+	} else {
+		ret = regmap_mmio_attach_clk(dsi->regs, dsi->bus_clk);
+		if (ret)
+			goto err_bus_clk;
+	}
+
 	if (of_device_is_compatible(dev->of_node,
 				    "allwinner,sun6i-a31-mipi-dsi")) {
 		dsi->mod_clk = devm_clk_get(dev, "mod");
 		if (IS_ERR(dsi->mod_clk)) {
 			dev_err(dev, "Couldn't get the DSI mod clock\n");
-			return PTR_ERR(dsi->mod_clk);
+			ret = PTR_ERR(dsi->mod_clk);
+			goto err_attach_clk;
 		}
 	}
 
@@ -1164,6 +1180,14 @@ static int sun6i_dsi_probe(struct platform_device *pdev)
 	pm_runtime_disable(dev);
 err_unprotect_clk:
 	clk_rate_exclusive_put(dsi->mod_clk);
+err_attach_clk:
+	if (!IS_ERR(dsi->bus_clk))
+		regmap_mmio_detach_clk(dsi->regs);
+err_bus_clk:
+	if (!IS_ERR(dsi->bus_clk))
+		clk_put(dsi->bus_clk);
+err_regmap:
+	regmap_exit(dsi->regs);
 	return ret;
 }
 
@@ -1177,6 +1201,11 @@ static int sun6i_dsi_remove(struct platform_device *pdev)
 	pm_runtime_disable(dev);
 	clk_rate_exclusive_put(dsi->mod_clk);
 
+	if (!IS_ERR(dsi->bus_clk))
+		regmap_mmio_detach_clk(dsi->regs);
+
+	regmap_exit(dsi->regs);
+
 	return 0;
 }
 
-- 
2.18.0.321.gffc6fa0e3

[PATCH v13 5/7] drm/sun4i: dsi: Add Allwinner A64 MIPI DSI support

[Jagan Teki]

The MIPI DSI controller in Allwinner A64 is similar to A33.

But unlike A33, A64 doesn't have DSI_SCLK gating so add compatible
for Allwinner A64 with uninitialized has_mod_clk driver.

Signed-off-by: Jagan Teki <jagan@amarulasolutions.com>
Tested-by: Merlijn Wajer <merlijn@wizzup.org>
---
Changes for v13:
- update the changes since has_mod_clk is dropped in previous patch

 drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c b/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c
index de8955fbeb00..8669d5f0e744 100644
--- a/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c
+++ b/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c
@@ -1264,6 +1264,7 @@ static const struct dev_pm_ops sun6i_dsi_pm_ops = {
 
 static const struct of_device_id sun6i_dsi_of_table[] = {
 	{ .compatible = "allwinner,sun6i-a31-mipi-dsi" },
+	{ .compatible = "allwinner,sun50i-a64-mipi-dsi" },
 	{ }
 };
 MODULE_DEVICE_TABLE(of, sun6i_dsi_of_table);
-- 
2.18.0.321.gffc6fa0e3

[PATCH v13 6/7] arm64: dts: allwinner: a64: Add MIPI DSI pipeline

[Jagan Teki]

Add MIPI DSI pipeline for Allwinner A64.

- dsi node, with A64 compatible since it doesn't support
  DSI_SCLK gating unlike A33
- dphy node, with A64 compatible with A33 fallback since
  DPHY on A64 and A33 is similar
- finally, attach the dsi_in to tcon0 for complete MIPI DSI

Signed-off-by: Jagan Teki <jagan@amarulasolutions.com>
Tested-by: Merlijn Wajer <merlijn@wizzup.org>
---
Changes for v13:
- none 

 arch/arm64/boot/dts/allwinner/sun50i-a64.dtsi | 37 +++++++++++++++++++
 1 file changed, 37 insertions(+)

diff --git a/arch/arm64/boot/dts/allwinner/sun50i-a64.dtsi b/arch/arm64/boot/dts/allwinner/sun50i-a64.dtsi
index 27e48234f1c2..1db8378f59a4 100644
--- a/arch/arm64/boot/dts/allwinner/sun50i-a64.dtsi
+++ b/arch/arm64/boot/dts/allwinner/sun50i-a64.dtsi
@@ -382,6 +382,12 @@
 					#address-cells = <1>;
 					#size-cells = <0>;
 					reg = <1>;
+
+					tcon0_out_dsi: endpoint@1 {
+						reg = <1>;
+						remote-endpoint = <&dsi_in_tcon0>;
+						allwinner,tcon-channel = <1>;
+					};
 				};
 			};
 		};
@@ -1014,6 +1020,37 @@
 			status = "disabled";
 		};
 
+		dsi: dsi@1ca0000 {
+			compatible = "allwinner,sun50i-a64-mipi-dsi";
+			reg = <0x01ca0000 0x1000>;
+			interrupts = <GIC_SPI 89 IRQ_TYPE_LEVEL_HIGH>;
+			clocks = <&ccu CLK_BUS_MIPI_DSI>;
+			resets = <&ccu RST_BUS_MIPI_DSI>;
+			phys = <&dphy>;
+			phy-names = "dphy";
+			status = "disabled";
+			#address-cells = <1>;
+			#size-cells = <0>;
+
+			port {
+				dsi_in_tcon0: endpoint {
+					remote-endpoint = <&tcon0_out_dsi>;
+				};
+			};
+		};
+
+		dphy: d-phy@1ca1000 {
+			compatible = "allwinner,sun50i-a64-mipi-dphy",
+				     "allwinner,sun6i-a31-mipi-dphy";
+			reg = <0x01ca1000 0x1000>;
+			clocks = <&ccu CLK_BUS_MIPI_DSI>,
+				 <&ccu CLK_DSI_DPHY>;
+			clock-names = "bus", "mod";
+			resets = <&ccu RST_BUS_MIPI_DSI>;
+			status = "disabled";
+			#phy-cells = <0>;
+		};
+
 		hdmi: hdmi@1ee0000 {
 			compatible = "allwinner,sun50i-a64-dw-hdmi",
 				     "allwinner,sun8i-a83t-dw-hdmi";
-- 
2.18.0.321.gffc6fa0e3

[DO NOT MERGE] [PATCH v13 7/7] arm64: dts: allwinner: bananapi-m64: Enable Bananapi S070WV20-CT16 DSI panel

[Jagan Teki]

This patch add support for Bananapi S070WV20-CT16 DSI panel to
BPI-M64 board.

DSI panel connected via board DSI port with,
- DLDO1 as VCC-DSI supply
- DCDC1 as VDD supply
- PD7 gpio for lcd enable pin
- PD6 gpio for lcd reset pin
- PD5 gpio for backlight enable pin

Signed-off-by: Jagan Teki <jagan@amarulasolutions.com>
---
 .../dts/allwinner/sun50i-a64-bananapi-m64.dts | 31 +++++++++++++++++++
 1 file changed, 31 insertions(+)

diff --git a/arch/arm64/boot/dts/allwinner/sun50i-a64-bananapi-m64.dts b/arch/arm64/boot/dts/allwinner/sun50i-a64-bananapi-m64.dts
index 208373efee49..6beaecdd802a 100644
--- a/arch/arm64/boot/dts/allwinner/sun50i-a64-bananapi-m64.dts
+++ b/arch/arm64/boot/dts/allwinner/sun50i-a64-bananapi-m64.dts
@@ -45,6 +45,7 @@
 #include "sun50i-a64.dtsi"
 
 #include <dt-bindings/gpio/gpio.h>
+#include <dt-bindings/pwm/pwm.h>
 
 / {
 	model = "BananaPi-M64";
@@ -56,6 +57,14 @@
 		serial1 = &uart1;
 	};
 
+	backlight: backlight {
+		compatible = "pwm-backlight";
+		pwms = <&r_pwm 0 50000 PWM_POLARITY_INVERTED>;
+		brightness-levels = <1 2 4 8 16 32 64 128 255>;
+		default-brightness-level = <2>;
+		enable-gpios = <&pio 3 5 GPIO_ACTIVE_HIGH>; /* LCD-BL-EN: PD5 */
+	};
+
 	chosen {
 		stdout-path = "serial0:115200n8";
 	};
@@ -116,6 +125,24 @@
 	status = "okay";
 };
 
+&dphy {
+	status = "okay";
+};
+
+&dsi {
+	vcc-dsi-supply = <&reg_dldo1>;		/* VCC3V3-DSI */
+	status = "okay";
+
+	panel@0 {
+		compatible = "bananapi,s070wv20-ct16-icn6211";
+		reg = <0>;
+		enable-gpios = <&pio 3 7 GPIO_ACTIVE_HIGH>; /* LCD-PWR-EN: PD7 */
+		reset-gpios = <&pio 3 6 GPIO_ACTIVE_HIGH>; /* LCD-RST: PD6 */
+		vdd-supply = <&reg_dcdc1>;
+		backlight = <&backlight>;
+	};
+};
+
 &ehci0 {
 	status = "okay";
 };
@@ -206,6 +233,10 @@
 	status = "okay";
 };
 
+&r_pwm {
+	status = "okay";
+};
+
 &r_rsb {
 	status = "okay";
 
-- 
2.18.0.321.gffc6fa0e3

Re: [PATCH v13 4/7] drm/sun4i: dsi: Handle bus clock via regmap_mmio_attach_clk

[Maxime Ripard]

[-- Attachment #1: Type: text/plain, Size: 4191 bytes --]

On Thu, Dec 19, 2019 at 12:40:14AM +0530, Jagan Teki wrote:
> regmap has special API to enable the controller bus clock while
> initializing register space, and current driver is using
> devm_regmap_init_mmio_clk which require to specify bus
> clk_id argument as "bus"
>
> But, the usage of clocks are varies between different Allwinner
> DSI controllers. Clocking in A33 would need bus and mod clocks
> where as A64 would need only bus clock.
>
> Since A64 support only single bus clock, it is optional to
> specify the clock-names on the controller device tree node.
> So using NULL on clk_id would get the attached clock.
>
> To support clk_id as "bus" and "NULL" during clock enablement
> between controllers, this patch add generic code to handle
> the bus clock using regmap_mmio_attach_clk with associated
> regmap APIs.
>
> Signed-off-by: Jagan Teki <jagan@amarulasolutions.com>
> ---
> Changes for v13:
> - update the changes since has_mod_clk is dropped in previous patch
>
>  drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c | 45 +++++++++++++++++++++-----
>  1 file changed, 37 insertions(+), 8 deletions(-)
>
> diff --git a/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c b/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c
> index 68b88a3dc4c5..de8955fbeb00 100644
> --- a/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c
> +++ b/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c
> @@ -1081,6 +1081,7 @@ static const struct component_ops sun6i_dsi_ops = {
>  static int sun6i_dsi_probe(struct platform_device *pdev)
>  {
>  	struct device *dev = &pdev->dev;
> +	const char *bus_clk_name = NULL;
>  	struct sun6i_dsi *dsi;
>  	struct resource *res;
>  	void __iomem *base;
> @@ -1094,6 +1095,10 @@ static int sun6i_dsi_probe(struct platform_device *pdev)
>  	dsi->host.ops = &sun6i_dsi_host_ops;
>  	dsi->host.dev = dev;
>
> +	if (of_device_is_compatible(dev->of_node,
> +				    "allwinner,sun6i-a31-mipi-dsi"))
> +		bus_clk_name = "bus";
> +
>  	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
>  	base = devm_ioremap_resource(dev, res);
>  	if (IS_ERR(base)) {
> @@ -1107,25 +1112,36 @@ static int sun6i_dsi_probe(struct platform_device *pdev)
>  		return PTR_ERR(dsi->regulator);
>  	}
>
> -	dsi->regs = devm_regmap_init_mmio_clk(dev, "bus", base,
> -					      &sun6i_dsi_regmap_config);
> -	if (IS_ERR(dsi->regs)) {
> -		dev_err(dev, "Couldn't create the DSI encoder regmap\n");
> -		return PTR_ERR(dsi->regs);
> -	}
> -
>  	dsi->reset = devm_reset_control_get_shared(dev, NULL);
>  	if (IS_ERR(dsi->reset)) {
>  		dev_err(dev, "Couldn't get our reset line\n");
>  		return PTR_ERR(dsi->reset);
>  	}
>
> +	dsi->regs = devm_regmap_init_mmio(dev, base, &sun6i_dsi_regmap_config);
> +	if (IS_ERR(dsi->regs)) {
> +		dev_err(dev, "Couldn't init regmap\n");
> +		return PTR_ERR(dsi->regs);
> +	}
> +
> +	dsi->bus_clk = devm_clk_get(dev, bus_clk_name);
> +	if (IS_ERR(dsi->bus_clk)) {
> +		dev_err(dev, "Couldn't get the DSI bus clock\n");
> +		ret = PTR_ERR(dsi->bus_clk);
> +		goto err_regmap;
> +	} else {
> +		ret = regmap_mmio_attach_clk(dsi->regs, dsi->bus_clk);
> +		if (ret)
> +			goto err_bus_clk;
> +	}
> +
>  	if (of_device_is_compatible(dev->of_node,
>  				    "allwinner,sun6i-a31-mipi-dsi")) {
>  		dsi->mod_clk = devm_clk_get(dev, "mod");
>  		if (IS_ERR(dsi->mod_clk)) {
>  			dev_err(dev, "Couldn't get the DSI mod clock\n");
> -			return PTR_ERR(dsi->mod_clk);
> +			ret = PTR_ERR(dsi->mod_clk);
> +			goto err_attach_clk;
>  		}
>  	}
>
> @@ -1164,6 +1180,14 @@ static int sun6i_dsi_probe(struct platform_device *pdev)
>  	pm_runtime_disable(dev);
>  err_unprotect_clk:
>  	clk_rate_exclusive_put(dsi->mod_clk);
> +err_attach_clk:
> +	if (!IS_ERR(dsi->bus_clk))
> +		regmap_mmio_detach_clk(dsi->regs);
> +err_bus_clk:
> +	if (!IS_ERR(dsi->bus_clk))
> +		clk_put(dsi->bus_clk);

You still have an unbalanced clk_get / clk_put here

> +err_regmap:
> +	regmap_exit(dsi->regs);

That's not needed.

>  	return ret;
>  }
>
> @@ -1177,6 +1201,11 @@ static int sun6i_dsi_remove(struct platform_device *pdev)
>  	pm_runtime_disable(dev);
>  	clk_rate_exclusive_put(dsi->mod_clk);
>
> +	if (!IS_ERR(dsi->bus_clk))
> +		regmap_mmio_detach_clk(dsi->regs);
> +
> +	regmap_exit(dsi->regs);

Same thing here.

Maxime

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Re: [PATCH v13 4/7] drm/sun4i: dsi: Handle bus clock via regmap_mmio_attach_clk

[Jagan Teki]

On Thu, Dec 19, 2019 at 3:35 AM Maxime Ripard <mripard@kernel.org> wrote:
>
> On Thu, Dec 19, 2019 at 12:40:14AM +0530, Jagan Teki wrote:
> > regmap has special API to enable the controller bus clock while
> > initializing register space, and current driver is using
> > devm_regmap_init_mmio_clk which require to specify bus
> > clk_id argument as "bus"
> >
> > But, the usage of clocks are varies between different Allwinner
> > DSI controllers. Clocking in A33 would need bus and mod clocks
> > where as A64 would need only bus clock.
> >
> > Since A64 support only single bus clock, it is optional to
> > specify the clock-names on the controller device tree node.
> > So using NULL on clk_id would get the attached clock.
> >
> > To support clk_id as "bus" and "NULL" during clock enablement
> > between controllers, this patch add generic code to handle
> > the bus clock using regmap_mmio_attach_clk with associated
> > regmap APIs.
> >
> > Signed-off-by: Jagan Teki <jagan@amarulasolutions.com>
> > ---
> > Changes for v13:
> > - update the changes since has_mod_clk is dropped in previous patch
> >
> >  drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c | 45 +++++++++++++++++++++-----
> >  1 file changed, 37 insertions(+), 8 deletions(-)
> >
> > diff --git a/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c b/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c
> > index 68b88a3dc4c5..de8955fbeb00 100644
> > --- a/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c
> > +++ b/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c
> > @@ -1081,6 +1081,7 @@ static const struct component_ops sun6i_dsi_ops = {
> >  static int sun6i_dsi_probe(struct platform_device *pdev)
> >  {
> >       struct device *dev = &pdev->dev;
> > +     const char *bus_clk_name = NULL;
> >       struct sun6i_dsi *dsi;
> >       struct resource *res;
> >       void __iomem *base;
> > @@ -1094,6 +1095,10 @@ static int sun6i_dsi_probe(struct platform_device *pdev)
> >       dsi->host.ops = &sun6i_dsi_host_ops;
> >       dsi->host.dev = dev;
> >
> > +     if (of_device_is_compatible(dev->of_node,
> > +                                 "allwinner,sun6i-a31-mipi-dsi"))
> > +             bus_clk_name = "bus";
> > +
> >       res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> >       base = devm_ioremap_resource(dev, res);
> >       if (IS_ERR(base)) {
> > @@ -1107,25 +1112,36 @@ static int sun6i_dsi_probe(struct platform_device *pdev)
> >               return PTR_ERR(dsi->regulator);
> >       }
> >
> > -     dsi->regs = devm_regmap_init_mmio_clk(dev, "bus", base,
> > -                                           &sun6i_dsi_regmap_config);
> > -     if (IS_ERR(dsi->regs)) {
> > -             dev_err(dev, "Couldn't create the DSI encoder regmap\n");
> > -             return PTR_ERR(dsi->regs);
> > -     }
> > -
> >       dsi->reset = devm_reset_control_get_shared(dev, NULL);
> >       if (IS_ERR(dsi->reset)) {
> >               dev_err(dev, "Couldn't get our reset line\n");
> >               return PTR_ERR(dsi->reset);
> >       }
> >
> > +     dsi->regs = devm_regmap_init_mmio(dev, base, &sun6i_dsi_regmap_config);
> > +     if (IS_ERR(dsi->regs)) {
> > +             dev_err(dev, "Couldn't init regmap\n");
> > +             return PTR_ERR(dsi->regs);
> > +     }
> > +
> > +     dsi->bus_clk = devm_clk_get(dev, bus_clk_name);
> > +     if (IS_ERR(dsi->bus_clk)) {
> > +             dev_err(dev, "Couldn't get the DSI bus clock\n");
> > +             ret = PTR_ERR(dsi->bus_clk);
> > +             goto err_regmap;
> > +     } else {
> > +             ret = regmap_mmio_attach_clk(dsi->regs, dsi->bus_clk);
> > +             if (ret)
> > +                     goto err_bus_clk;
> > +     }
> > +
> >       if (of_device_is_compatible(dev->of_node,
> >                                   "allwinner,sun6i-a31-mipi-dsi")) {
> >               dsi->mod_clk = devm_clk_get(dev, "mod");
> >               if (IS_ERR(dsi->mod_clk)) {
> >                       dev_err(dev, "Couldn't get the DSI mod clock\n");
> > -                     return PTR_ERR(dsi->mod_clk);
> > +                     ret = PTR_ERR(dsi->mod_clk);
> > +                     goto err_attach_clk;
> >               }
> >       }
> >
> > @@ -1164,6 +1180,14 @@ static int sun6i_dsi_probe(struct platform_device *pdev)
> >       pm_runtime_disable(dev);
> >  err_unprotect_clk:
> >       clk_rate_exclusive_put(dsi->mod_clk);
> > +err_attach_clk:
> > +     if (!IS_ERR(dsi->bus_clk))
> > +             regmap_mmio_detach_clk(dsi->regs);
> > +err_bus_clk:
> > +     if (!IS_ERR(dsi->bus_clk))
> > +             clk_put(dsi->bus_clk);
>
> You still have an unbalanced clk_get / clk_put here

You mean it is not needed right since devm_clk_get has release call
via devres_alloc? or the wrong position for clk_put?

>
> > +err_regmap:
> > +     regmap_exit(dsi->regs);
>
> That's not needed.

Yes. look like __devm_regmap_init has release call with regmap_exit.

Thanks for the comments, I will update these and send next version.
Let me know if you have any more comments?

Re: [PATCH v13 4/7] drm/sun4i: dsi: Handle bus clock via regmap_mmio_attach_clk

[Maxime Ripard]

[-- Attachment #1: Type: text/plain, Size: 4976 bytes --]

On Sat, Dec 21, 2019 at 05:11:00PM +0530, Jagan Teki wrote:
> On Thu, Dec 19, 2019 at 3:35 AM Maxime Ripard <mripard@kernel.org> wrote:
> >
> > On Thu, Dec 19, 2019 at 12:40:14AM +0530, Jagan Teki wrote:
> > > regmap has special API to enable the controller bus clock while
> > > initializing register space, and current driver is using
> > > devm_regmap_init_mmio_clk which require to specify bus
> > > clk_id argument as "bus"
> > >
> > > But, the usage of clocks are varies between different Allwinner
> > > DSI controllers. Clocking in A33 would need bus and mod clocks
> > > where as A64 would need only bus clock.
> > >
> > > Since A64 support only single bus clock, it is optional to
> > > specify the clock-names on the controller device tree node.
> > > So using NULL on clk_id would get the attached clock.
> > >
> > > To support clk_id as "bus" and "NULL" during clock enablement
> > > between controllers, this patch add generic code to handle
> > > the bus clock using regmap_mmio_attach_clk with associated
> > > regmap APIs.
> > >
> > > Signed-off-by: Jagan Teki <jagan@amarulasolutions.com>
> > > ---
> > > Changes for v13:
> > > - update the changes since has_mod_clk is dropped in previous patch
> > >
> > >  drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c | 45 +++++++++++++++++++++-----
> > >  1 file changed, 37 insertions(+), 8 deletions(-)
> > >
> > > diff --git a/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c b/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c
> > > index 68b88a3dc4c5..de8955fbeb00 100644
> > > --- a/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c
> > > +++ b/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c
> > > @@ -1081,6 +1081,7 @@ static const struct component_ops sun6i_dsi_ops = {
> > >  static int sun6i_dsi_probe(struct platform_device *pdev)
> > >  {
> > >       struct device *dev = &pdev->dev;
> > > +     const char *bus_clk_name = NULL;
> > >       struct sun6i_dsi *dsi;
> > >       struct resource *res;
> > >       void __iomem *base;
> > > @@ -1094,6 +1095,10 @@ static int sun6i_dsi_probe(struct platform_device *pdev)
> > >       dsi->host.ops = &sun6i_dsi_host_ops;
> > >       dsi->host.dev = dev;
> > >
> > > +     if (of_device_is_compatible(dev->of_node,
> > > +                                 "allwinner,sun6i-a31-mipi-dsi"))
> > > +             bus_clk_name = "bus";
> > > +
> > >       res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> > >       base = devm_ioremap_resource(dev, res);
> > >       if (IS_ERR(base)) {
> > > @@ -1107,25 +1112,36 @@ static int sun6i_dsi_probe(struct platform_device *pdev)
> > >               return PTR_ERR(dsi->regulator);
> > >       }
> > >
> > > -     dsi->regs = devm_regmap_init_mmio_clk(dev, "bus", base,
> > > -                                           &sun6i_dsi_regmap_config);
> > > -     if (IS_ERR(dsi->regs)) {
> > > -             dev_err(dev, "Couldn't create the DSI encoder regmap\n");
> > > -             return PTR_ERR(dsi->regs);
> > > -     }
> > > -
> > >       dsi->reset = devm_reset_control_get_shared(dev, NULL);
> > >       if (IS_ERR(dsi->reset)) {
> > >               dev_err(dev, "Couldn't get our reset line\n");
> > >               return PTR_ERR(dsi->reset);
> > >       }
> > >
> > > +     dsi->regs = devm_regmap_init_mmio(dev, base, &sun6i_dsi_regmap_config);
> > > +     if (IS_ERR(dsi->regs)) {
> > > +             dev_err(dev, "Couldn't init regmap\n");
> > > +             return PTR_ERR(dsi->regs);
> > > +     }
> > > +
> > > +     dsi->bus_clk = devm_clk_get(dev, bus_clk_name);
> > > +     if (IS_ERR(dsi->bus_clk)) {
> > > +             dev_err(dev, "Couldn't get the DSI bus clock\n");
> > > +             ret = PTR_ERR(dsi->bus_clk);
> > > +             goto err_regmap;
> > > +     } else {
> > > +             ret = regmap_mmio_attach_clk(dsi->regs, dsi->bus_clk);
> > > +             if (ret)
> > > +                     goto err_bus_clk;
> > > +     }
> > > +
> > >       if (of_device_is_compatible(dev->of_node,
> > >                                   "allwinner,sun6i-a31-mipi-dsi")) {
> > >               dsi->mod_clk = devm_clk_get(dev, "mod");
> > >               if (IS_ERR(dsi->mod_clk)) {
> > >                       dev_err(dev, "Couldn't get the DSI mod clock\n");
> > > -                     return PTR_ERR(dsi->mod_clk);
> > > +                     ret = PTR_ERR(dsi->mod_clk);
> > > +                     goto err_attach_clk;
> > >               }
> > >       }
> > >
> > > @@ -1164,6 +1180,14 @@ static int sun6i_dsi_probe(struct platform_device *pdev)
> > >       pm_runtime_disable(dev);
> > >  err_unprotect_clk:
> > >       clk_rate_exclusive_put(dsi->mod_clk);
> > > +err_attach_clk:
> > > +     if (!IS_ERR(dsi->bus_clk))
> > > +             regmap_mmio_detach_clk(dsi->regs);
> > > +err_bus_clk:
> > > +     if (!IS_ERR(dsi->bus_clk))
> > > +             clk_put(dsi->bus_clk);
> >
> > You still have an unbalanced clk_get / clk_put here
>
> You mean it is not needed right since devm_clk_get has release call
> via devres_alloc?

Yes

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