[PATCH v3 0/3] DRM driver for Sitronix ST7735R display panels

[PATCH v3 0/3] DRM driver for Sitronix ST7735R display panels

[David Lechner]

This series adds a new DRM/TinyDRM driver for Sitronix ST7735R, specifically
the Adafruit 1.8" TFT.

Nothing fancy here. Just mostly TinyDRM boilerplate with the init sequence
from the fbtft driver for the same panel.

v3 changes:
* New patch for jianda vendor prefix
* Change compatible string in DT bindings (dropped ACK because of this)
* Use SPDX license ID

David Lechner (3):
  dt-bindings: add jianda vendor prefix
  dt-bindings: Add binding for Sitronix ST7735R display panels
  drm/tinydrm: add driver for ST7735R panels

 .../bindings/display/sitronix,st7735r.txt          |  35 ++++
 .../devicetree/bindings/vendor-prefixes.txt        |   1 +
 MAINTAINERS                                        |   6 +
 drivers/gpu/drm/tinydrm/Kconfig                    |  10 +
 drivers/gpu/drm/tinydrm/Makefile                   |   1 +
 drivers/gpu/drm/tinydrm/st7735r.c                  | 215 +++++++++++++++++++++
 6 files changed, 268 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/display/sitronix,st7735r.txt
 create mode 100644 drivers/gpu/drm/tinydrm/st7735r.c

-- 
2.7.4

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[PATCH v3 1/3] dt-bindings: add jianda vendor prefix

[David Lechner]

This adds a vendor prefix "jianda" for Jiandangjing Technology Co., Ltd.

Signed-off-by: David Lechner <david@lechnology.com>
---

v3 changes:
* new patch in v3

 Documentation/devicetree/bindings/vendor-prefixes.txt | 1 +
 1 file changed, 1 insertion(+)

diff --git a/Documentation/devicetree/bindings/vendor-prefixes.txt b/Documentation/devicetree/bindings/vendor-prefixes.txt
index 41cb1ff0..fea7903 100644
--- a/Documentation/devicetree/bindings/vendor-prefixes.txt
+++ b/Documentation/devicetree/bindings/vendor-prefixes.txt
@@ -172,6 +172,7 @@ issi	Integrated Silicon Solutions Inc.
 itead	ITEAD Intelligent Systems Co.Ltd
 iwave  iWave Systems Technologies Pvt. Ltd.
 jdi	Japan Display Inc.
+jianda	Jiandangjing Technology Co., Ltd.
 jedec	JEDEC Solid State Technology Association
 karo	Ka-Ro electronics GmbH
 keithkoep	Keith & Koep GmbH
-- 
2.7.4

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Re: [PATCH v3 1/3] dt-bindings: add jianda vendor prefix

[Rob Herring]

On Thu, Dec 21, 2017 at 01:23:51PM -0600, David Lechner wrote:
> This adds a vendor prefix "jianda" for Jiandangjing Technology Co., Ltd.
> 
> Signed-off-by: David Lechner <david-nq/r/kbU++upp/zk7JDF2g@public.gmane.org>
> ---
> 
> v3 changes:
> * new patch in v3
> 
>  Documentation/devicetree/bindings/vendor-prefixes.txt | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/Documentation/devicetree/bindings/vendor-prefixes.txt b/Documentation/devicetree/bindings/vendor-prefixes.txt
> index 41cb1ff0..fea7903 100644
> --- a/Documentation/devicetree/bindings/vendor-prefixes.txt
> +++ b/Documentation/devicetree/bindings/vendor-prefixes.txt
> @@ -172,6 +172,7 @@ issi	Integrated Silicon Solutions Inc.
>  itead	ITEAD Intelligent Systems Co.Ltd
>  iwave  iWave Systems Technologies Pvt. Ltd.
>  jdi	Japan Display Inc.
> +jianda	Jiandangjing Technology Co., Ltd.
>  jedec	JEDEC Solid State Technology Association

Err, not alphabetical order.

With that fixed,

Reviewed-by: Rob Herring <robh-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>

>  karo	Ka-Ro electronics GmbH
>  keithkoep	Keith & Koep GmbH
> -- 
> 2.7.4
> 
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[PATCH v3 2/3] dt-bindings: Add binding for Sitronix ST7735R display panels

[David Lechner]

This adds a new device tree binding for Sitronix ST7735R display panels,
such as the Adafruit 1.8" TFT.

Signed-off-by: David Lechner <david@lechnology.com>
---

v3 changes:
* compatible string is changed from "sitronix,st7735r-jd-t18003-t01" to
"jianda,jd-t18003-t01", "sitronix,st7735r"

v2 changes:
* none

 .../bindings/display/sitronix,st7735r.txt          | 35 ++++++++++++++++++++++
 1 file changed, 35 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/display/sitronix,st7735r.txt

diff --git a/Documentation/devicetree/bindings/display/sitronix,st7735r.txt b/Documentation/devicetree/bindings/display/sitronix,st7735r.txt
new file mode 100644
index 0000000..f0a5090
--- /dev/null
+++ b/Documentation/devicetree/bindings/display/sitronix,st7735r.txt
@@ -0,0 +1,35 @@
+Sitronix ST7735R display panels
+
+This binding is for display panels using a Sitronix ST7735R controller in SPI
+mode.
+
+Required properties:
+- compatible:	"jianda,jd-t18003-t01", "sitronix,st7735r"
+- dc-gpios:	Display data/command selection (D/CX)
+- reset-gpios:	Reset signal (RSTX)
+
+The node for this driver must be a child node of a SPI controller, hence
+all mandatory properties described in ../spi/spi-bus.txt must be specified.
+
+Optional properties:
+- rotation:	panel rotation in degrees counter clockwise (0,90,180,270)
+- backlight:	phandle of the backlight device attached to the panel
+
+Example:
+
+	backlight: backlight {
+		compatible = "gpio-backlight";
+		gpios = <&gpio 44 GPIO_ACTIVE_HIGH>;
+	}
+
+	...
+
+	display@0{
+		compatible = "jianda,jd-t18003-t01", "sitronix,st7735r";
+		reg = <0>;
+		spi-max-frequency = <32000000>;
+		dc-gpios = <&gpio 43 GPIO_ACTIVE_HIGH>;
+		reset-gpios = <&gpio 80 GPIO_ACTIVE_HIGH>;
+		rotation = <270>;
+		backlight = &backlight;
+	};
-- 
2.7.4

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Re: [PATCH v3 2/3] dt-bindings: Add binding for Sitronix ST7735R display panels

[Rob Herring]

On Thu, Dec 21, 2017 at 1:23 PM, David Lechner <david@lechnology.com> wrote:
> This adds a new device tree binding for Sitronix ST7735R display panels,
> such as the Adafruit 1.8" TFT.
>
> Signed-off-by: David Lechner <david@lechnology.com>
> ---
>
> v3 changes:
> * compatible string is changed from "sitronix,st7735r-jd-t18003-t01" to
> "jianda,jd-t18003-t01", "sitronix,st7735r"
>
> v2 changes:
> * none
>
>  .../bindings/display/sitronix,st7735r.txt          | 35 ++++++++++++++++++++++
>  1 file changed, 35 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/display/sitronix,st7735r.txt

Reviewed-by: Rob Herring <robh@kernel.org>
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[PATCH v3 3/3] drm/tinydrm: add driver for ST7735R panels

[David Lechner]

This adds a new driver for Sitronix ST7735R display panels.

This has been tested using an Adafruit 1.8" TFT.

Signed-off-by: David Lechner <david@lechnology.com>
---

v3 changes:
* Changed compatible string
* use SPDX license header
* Renamed mode struct to use panel name instead of controller name

v2 changes:
* Change delay from 10ms to 20ms to avoid checkpatch warning
* Use mipi_dbi_pipe_enable()/mipi_dbi_pipe_disable() to reduce duplicated code
* Rebase on drm-misc-next (tinydrm_lastclose => drm_fb_helper_lastclose)
* Use mipi_dbi_debugfs_init
* Add mipi->read_commands = NULL; since this display is write-only


 MAINTAINERS                       |   6 ++
 drivers/gpu/drm/tinydrm/Kconfig   |  10 ++
 drivers/gpu/drm/tinydrm/Makefile  |   1 +
 drivers/gpu/drm/tinydrm/st7735r.c | 215 ++++++++++++++++++++++++++++++++++++++
 4 files changed, 232 insertions(+)
 create mode 100644 drivers/gpu/drm/tinydrm/st7735r.c

diff --git a/MAINTAINERS b/MAINTAINERS
index 91268cb..95e98e2 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -4556,6 +4556,12 @@ S:	Maintained
 F:	drivers/gpu/drm/tinydrm/st7586.c
 F:	Documentation/devicetree/bindings/display/st7586.txt
 
+DRM DRIVER FOR SITRONIX ST7735R PANELS
+M:	David Lechner <david@lechnology.com>
+S:	Maintained
+F:	drivers/gpu/drm/tinydrm/st7735r.c
+F:	Documentation/devicetree/bindings/display/st7735r.txt
+
 DRM DRIVER FOR TDFX VIDEO CARDS
 S:	Orphan / Obsolete
 F:	drivers/gpu/drm/tdfx/
diff --git a/drivers/gpu/drm/tinydrm/Kconfig b/drivers/gpu/drm/tinydrm/Kconfig
index 90c5bd5..b0e567d 100644
--- a/drivers/gpu/drm/tinydrm/Kconfig
+++ b/drivers/gpu/drm/tinydrm/Kconfig
@@ -52,3 +52,13 @@ config TINYDRM_ST7586
 	  * LEGO MINDSTORMS EV3
 
 	  If M is selected the module will be called st7586.
+
+config TINYDRM_ST7735R
+	tristate "DRM support for Sitronix ST7735R display panels"
+	depends on DRM_TINYDRM && SPI
+	select TINYDRM_MIPI_DBI
+	help
+	  DRM driver Sitronix ST7735R with one of the following LCDs:
+	  * JD-T18003-T01 1.8" 128x160 TFT
+
+	  If M is selected the module will be called st7735r.
diff --git a/drivers/gpu/drm/tinydrm/Makefile b/drivers/gpu/drm/tinydrm/Makefile
index 8aeee53..49a1119 100644
--- a/drivers/gpu/drm/tinydrm/Makefile
+++ b/drivers/gpu/drm/tinydrm/Makefile
@@ -8,3 +8,4 @@ obj-$(CONFIG_TINYDRM_ILI9225)		+= ili9225.o
 obj-$(CONFIG_TINYDRM_MI0283QT)		+= mi0283qt.o
 obj-$(CONFIG_TINYDRM_REPAPER)		+= repaper.o
 obj-$(CONFIG_TINYDRM_ST7586)		+= st7586.o
+obj-$(CONFIG_TINYDRM_ST7735R)		+= st7735r.o
diff --git a/drivers/gpu/drm/tinydrm/st7735r.c b/drivers/gpu/drm/tinydrm/st7735r.c
new file mode 100644
index 0000000..0b05b2c
--- /dev/null
+++ b/drivers/gpu/drm/tinydrm/st7735r.c
@@ -0,0 +1,215 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * DRM driver for Sitronix ST7735R panels
+ *
+ * Copyright 2017 David Lechner <david@lechnology.com>
+ */
+
+#include <linux/delay.h>
+#include <linux/dma-buf.h>
+#include <linux/gpio/consumer.h>
+#include <linux/module.h>
+#include <linux/property.h>
+#include <linux/spi/spi.h>
+#include <video/mipi_display.h>
+
+#include <drm/drm_fb_helper.h>
+#include <drm/drm_gem_framebuffer_helper.h>
+#include <drm/tinydrm/mipi-dbi.h>
+#include <drm/tinydrm/tinydrm-helpers.h>
+
+#define ST7735R_FRMCTR1		0xb1
+#define ST7735R_FRMCTR2		0xb2
+#define ST7735R_FRMCTR3		0xb3
+#define ST7735R_INVCTR		0xb4
+#define ST7735R_PWCTR1		0xc0
+#define ST7735R_PWCTR2		0xc1
+#define ST7735R_PWCTR3		0xc2
+#define ST7735R_PWCTR4		0xc3
+#define ST7735R_PWCTR5		0xc4
+#define ST7735R_VMCTR1		0xc5
+#define ST7735R_GAMCTRP1	0xe0
+#define ST7735R_GAMCTRN1	0xe1
+
+#define ST7735R_MY	BIT(7)
+#define ST7735R_MX	BIT(6)
+#define ST7735R_MV	BIT(5)
+
+static void st7735r_pipe_enable(struct drm_simple_display_pipe *pipe,
+				struct drm_crtc_state *crtc_state)
+{
+	struct tinydrm_device *tdev = pipe_to_tinydrm(pipe);
+	struct mipi_dbi *mipi = mipi_dbi_from_tinydrm(tdev);
+	struct device *dev = tdev->drm->dev;
+	int ret;
+	u8 addr_mode;
+
+	DRM_DEBUG_KMS("\n");
+
+	mipi_dbi_hw_reset(mipi);
+
+	ret = mipi_dbi_command(mipi, MIPI_DCS_SOFT_RESET);
+	if (ret) {
+		DRM_DEV_ERROR(dev, "Error sending command %d\n", ret);
+		return;
+	}
+
+	msleep(150);
+
+	mipi_dbi_command(mipi, MIPI_DCS_EXIT_SLEEP_MODE);
+	msleep(500);
+
+	mipi_dbi_command(mipi, ST7735R_FRMCTR1, 0x01, 0x2c, 0x2d);
+	mipi_dbi_command(mipi, ST7735R_FRMCTR2, 0x01, 0x2c, 0x2d);
+	mipi_dbi_command(mipi, ST7735R_FRMCTR3, 0x01, 0x2c, 0x2d, 0x01, 0x2c,
+			 0x2d);
+	mipi_dbi_command(mipi, ST7735R_INVCTR, 0x07);
+	mipi_dbi_command(mipi, ST7735R_PWCTR1, 0xa2, 0x02, 0x84);
+	mipi_dbi_command(mipi, ST7735R_PWCTR2, 0xc5);
+	mipi_dbi_command(mipi, ST7735R_PWCTR3, 0x0a, 0x00);
+	mipi_dbi_command(mipi, ST7735R_PWCTR4, 0x8a, 0x2a);
+	mipi_dbi_command(mipi, ST7735R_PWCTR5, 0x8a, 0xee);
+	mipi_dbi_command(mipi, ST7735R_VMCTR1, 0x0e);
+	mipi_dbi_command(mipi, MIPI_DCS_EXIT_INVERT_MODE);
+	switch (mipi->rotation) {
+	default:
+		addr_mode = ST7735R_MX | ST7735R_MY;
+		break;
+	case 90:
+		addr_mode = ST7735R_MX | ST7735R_MV;
+		break;
+	case 180:
+		addr_mode = 0;
+		break;
+	case 270:
+		addr_mode = ST7735R_MY | ST7735R_MV;
+		break;
+	}
+	mipi_dbi_command(mipi, MIPI_DCS_SET_ADDRESS_MODE, addr_mode);
+	mipi_dbi_command(mipi, MIPI_DCS_SET_PIXEL_FORMAT,
+			 MIPI_DCS_PIXEL_FMT_16BIT);
+	mipi_dbi_command(mipi, ST7735R_GAMCTRP1, 0x0f, 0x1a, 0x0f, 0x18, 0x2f,
+			 0x28, 0x20, 0x22, 0x1f, 0x1b, 0x23, 0x37, 0x00, 0x07,
+			 0x02, 0x10);
+	mipi_dbi_command(mipi, ST7735R_GAMCTRN1, 0x0f, 0x1b, 0x0f, 0x17, 0x33,
+			 0x2c, 0x29, 0x2e, 0x30, 0x30, 0x39, 0x3f, 0x00, 0x07,
+			 0x03, 0x10);
+	mipi_dbi_command(mipi, MIPI_DCS_SET_DISPLAY_ON);
+
+	msleep(100);
+
+	mipi_dbi_command(mipi, MIPI_DCS_ENTER_NORMAL_MODE);
+
+	msleep(20);
+
+	mipi_dbi_pipe_enable(pipe, crtc_state);
+}
+
+static const struct drm_simple_display_pipe_funcs st7735r_pipe_funcs = {
+	.enable		= st7735r_pipe_enable,
+	.disable	= mipi_dbi_pipe_disable,
+	.update		= tinydrm_display_pipe_update,
+	.prepare_fb	= tinydrm_display_pipe_prepare_fb,
+};
+
+static const struct drm_display_mode jd_t18003_t01_mode = {
+	TINYDRM_MODE(128, 160, 28, 35),
+};
+
+DEFINE_DRM_GEM_CMA_FOPS(st7735r_fops);
+
+static struct drm_driver st7735r_driver = {
+	.driver_features	= DRIVER_GEM | DRIVER_MODESET | DRIVER_PRIME |
+				  DRIVER_ATOMIC,
+	.fops			= &st7735r_fops,
+	TINYDRM_GEM_DRIVER_OPS,
+	.lastclose		= drm_fb_helper_lastclose,
+	.debugfs_init		= mipi_dbi_debugfs_init,
+	.name			= "st7735r",
+	.desc			= "Sitronix ST7735R",
+	.date			= "20171128",
+	.major			= 1,
+	.minor			= 0,
+};
+
+static const struct of_device_id st7735r_of_match[] = {
+	{ .compatible = "jianda,jd-t18003-t01" },
+	{},
+};
+MODULE_DEVICE_TABLE(of, st7735r_of_match);
+
+static const struct spi_device_id st7735r_id[] = {
+	{ "jd-t18003-t01", 0 },
+	{ },
+};
+MODULE_DEVICE_TABLE(spi, st7735r_id);
+
+static int st7735r_probe(struct spi_device *spi)
+{
+	struct device *dev = &spi->dev;
+	struct mipi_dbi *mipi;
+	struct gpio_desc *dc;
+	u32 rotation = 0;
+	int ret;
+
+	mipi = devm_kzalloc(dev, sizeof(*mipi), GFP_KERNEL);
+	if (!mipi)
+		return -ENOMEM;
+
+	mipi->reset = devm_gpiod_get(dev, "reset", GPIOD_OUT_HIGH);
+	if (IS_ERR(mipi->reset)) {
+		DRM_DEV_ERROR(dev, "Failed to get gpio 'reset'\n");
+		return PTR_ERR(mipi->reset);
+	}
+
+	dc = devm_gpiod_get(dev, "dc", GPIOD_OUT_LOW);
+	if (IS_ERR(dc)) {
+		DRM_DEV_ERROR(dev, "Failed to get gpio 'dc'\n");
+		return PTR_ERR(dc);
+	}
+
+	mipi->backlight = tinydrm_of_find_backlight(dev);
+	if (IS_ERR(mipi->backlight))
+		return PTR_ERR(mipi->backlight);
+
+	device_property_read_u32(dev, "rotation", &rotation);
+
+	ret = mipi_dbi_spi_init(spi, mipi, dc);
+	if (ret)
+		return ret;
+
+	/* Cannot read from Adafruit 1.8" display via SPI */
+	mipi->read_commands = NULL;
+
+	ret = mipi_dbi_init(&spi->dev, mipi, &st7735r_pipe_funcs,
+			    &st7735r_driver, &jd_t18003_t01_mode, rotation);
+	if (ret)
+		return ret;
+
+	spi_set_drvdata(spi, mipi);
+
+	return devm_tinydrm_register(&mipi->tinydrm);
+}
+
+static void st7735r_shutdown(struct spi_device *spi)
+{
+	struct mipi_dbi *mipi = spi_get_drvdata(spi);
+
+	tinydrm_shutdown(&mipi->tinydrm);
+}
+
+static struct spi_driver st7735r_spi_driver = {
+	.driver = {
+		.name = "st7735r",
+		.owner = THIS_MODULE,
+		.of_match_table = st7735r_of_match,
+	},
+	.id_table = st7735r_id,
+	.probe = st7735r_probe,
+	.shutdown = st7735r_shutdown,
+};
+module_spi_driver(st7735r_spi_driver);
+
+MODULE_DESCRIPTION("Sitronix ST7735R DRM driver");
+MODULE_AUTHOR("David Lechner <david@lechnology.com>");
+MODULE_LICENSE("GPL");
-- 
2.7.4

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Re: [PATCH v3 3/3] drm/tinydrm: add driver for ST7735R panels

[David Lechner]

On 12/21/2017 01:23 PM, David Lechner wrote:
> This adds a new driver for Sitronix ST7735R display panels.
> 
> This has been tested using an Adafruit 1.8" TFT.
> 
> Signed-off-by: David Lechner <david-nq/r/kbU++upp/zk7JDF2g@public.gmane.org>
> ---

<snip>

> +	mipi_dbi_command(mipi, ST7735R_GAMCTRP1, 0x0f, 0x1a, 0x0f, 0x18, 0x2f,
> +			 0x28, 0x20, 0x22, 0x1f, 0x1b, 0x23, 0x37, 0x00, 0x07,
> +			 0x02, 0x10);
> +	mipi_dbi_command(mipi, ST7735R_GAMCTRN1, 0x0f, 0x1b, 0x0f, 0x17, 0x33,
> +			 0x2c, 0x29, 0x2e, 0x30, 0x30, 0x39, 0x3f, 0x00, 0x07,
> +			 0x03, 0x10);
By the way, how do you know what is the "right" gamma curve? I think I 
copied this from the generic st7735r driver in fbtft, but I noticed that 
there is also a different curve for the Adafruit 1.8" display in fbtft. 
I'm wondering if I should have used that one instead. I can't really 
tell a difference looking at the display.
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Re: [PATCH v3 3/3] drm/tinydrm: add driver for ST7735R panels

[Noralf Trønnes]

Den 21.12.2017 20.35, skrev David Lechner:
> On 12/21/2017 01:23 PM, David Lechner wrote:
>> This adds a new driver for Sitronix ST7735R display panels.
>>
>> This has been tested using an Adafruit 1.8" TFT.
>>
>> Signed-off-by: David Lechner <david@lechnology.com>
>> ---
>
> <snip>
>
>> +    mipi_dbi_command(mipi, ST7735R_GAMCTRP1, 0x0f, 0x1a, 0x0f, 0x18, 
>> 0x2f,
>> +             0x28, 0x20, 0x22, 0x1f, 0x1b, 0x23, 0x37, 0x00, 0x07,
>> +             0x02, 0x10);
>> +    mipi_dbi_command(mipi, ST7735R_GAMCTRN1, 0x0f, 0x1b, 0x0f, 0x17, 
>> 0x33,
>> +             0x2c, 0x29, 0x2e, 0x30, 0x30, 0x39, 0x3f, 0x00, 0x07,
>> +             0x03, 0x10);
> By the way, how do you know what is the "right" gamma curve? I think I 
> copied this from the generic st7735r driver in fbtft, but I noticed 
> that there is also a different curve for the Adafruit 1.8" display in 
> fbtft. I'm wondering if I should have used that one instead. I can't 
> really tell a difference looking at the display.

 From what I can tell this is the curve used by the Arduino library:

https://github.com/adafruit/Adafruit-ST7735-Library/blob/master/Adafruit_ST7735.cpp

static const uint8_t PROGMEM
   Rcmd3[] = {                 // Init for 7735R, part 3 (red or green tab)
     4,                        //  4 commands in list:
     ST7735_GMCTRP1, 16      , //  1: Magical unicorn dust, 16 args, no 
delay:
       0x02, 0x1c, 0x07, 0x12,
       0x37, 0x32, 0x29, 0x2d,
       0x29, 0x25, 0x2B, 0x39,
       0x00, 0x01, 0x03, 0x10,
     ST7735_GMCTRN1, 16      , //  2: Sparkles and rainbows, 16 args, no 
delay:
       0x03, 0x1d, 0x07, 0x06,
       0x2E, 0x2C, 0x29, 0x2D,
       0x2E, 0x2E, 0x37, 0x3F,
       0x00, 0x00, 0x02, 0x10,

void Adafruit_ST7735::initR(uint8_t options) {
   commonInit(Rcmd1);
...
   commandList(Rcmd3);


Noralf.

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Re: [PATCH v3 3/3] drm/tinydrm: add driver for ST7735R panels

[Noralf Trønnes]

Den 21.12.2017 20.23, skrev David Lechner:
> This adds a new driver for Sitronix ST7735R display panels.
>
> This has been tested using an Adafruit 1.8" TFT.
>
> Signed-off-by: David Lechner <david@lechnology.com>
> ---
>
> v3 changes:
> * Changed compatible string
> * use SPDX license header
> * Renamed mode struct to use panel name instead of controller name
>
> v2 changes:
> * Change delay from 10ms to 20ms to avoid checkpatch warning
> * Use mipi_dbi_pipe_enable()/mipi_dbi_pipe_disable() to reduce duplicated code
> * Rebase on drm-misc-next (tinydrm_lastclose => drm_fb_helper_lastclose)
> * Use mipi_dbi_debugfs_init
> * Add mipi->read_commands = NULL; since this display is write-only
<snip>
> diff --git a/drivers/gpu/drm/tinydrm/st7735r.c b/drivers/gpu/drm/tinydrm/st7735r.c
> new file mode 100644
> index 0000000..0b05b2c
> --- /dev/null
> +++ b/drivers/gpu/drm/tinydrm/st7735r.c
> @@ -0,0 +1,215 @@
> +// SPDX-License-Identifier: GPL-2.0+
> +/*
> + * DRM driver for Sitronix ST7735R panels
> + *
> + * Copyright 2017 David Lechner <david@lechnology.com>
> + */
> +
> +#include <linux/delay.h>
> +#include <linux/dma-buf.h>
> +#include <linux/gpio/consumer.h>
> +#include <linux/module.h>
> +#include <linux/property.h>
> +#include <linux/spi/spi.h>
> +#include <video/mipi_display.h>
> +
> +#include <drm/drm_fb_helper.h>
> +#include <drm/drm_gem_framebuffer_helper.h>
> +#include <drm/tinydrm/mipi-dbi.h>
> +#include <drm/tinydrm/tinydrm-helpers.h>
> +
> +#define ST7735R_FRMCTR1		0xb1
> +#define ST7735R_FRMCTR2		0xb2
> +#define ST7735R_FRMCTR3		0xb3
> +#define ST7735R_INVCTR		0xb4
> +#define ST7735R_PWCTR1		0xc0
> +#define ST7735R_PWCTR2		0xc1
> +#define ST7735R_PWCTR3		0xc2
> +#define ST7735R_PWCTR4		0xc3
> +#define ST7735R_PWCTR5		0xc4
> +#define ST7735R_VMCTR1		0xc5
> +#define ST7735R_GAMCTRP1	0xe0
> +#define ST7735R_GAMCTRN1	0xe1
> +
> +#define ST7735R_MY	BIT(7)
> +#define ST7735R_MX	BIT(6)
> +#define ST7735R_MV	BIT(5)
> +
> +static void st7735r_pipe_enable(struct drm_simple_display_pipe *pipe,
> +				struct drm_crtc_state *crtc_state)

This is confusing, you name the mode after the panel, but not the enable
function which has an initialization sequence that is also panel specific.

With .enable function named after the panel (and *_pipe_funcs):

Reviewed-by: Noralf Trønnes <noralf@tronnes.org>

> +{
> +	struct tinydrm_device *tdev = pipe_to_tinydrm(pipe);
> +	struct mipi_dbi *mipi = mipi_dbi_from_tinydrm(tdev);
> +	struct device *dev = tdev->drm->dev;
> +	int ret;
> +	u8 addr_mode;
> +
> +	DRM_DEBUG_KMS("\n");
> +
> +	mipi_dbi_hw_reset(mipi);
> +
> +	ret = mipi_dbi_command(mipi, MIPI_DCS_SOFT_RESET);
> +	if (ret) {
> +		DRM_DEV_ERROR(dev, "Error sending command %d\n", ret);
> +		return;
> +	}
> +
> +	msleep(150);
> +
> +	mipi_dbi_command(mipi, MIPI_DCS_EXIT_SLEEP_MODE);
> +	msleep(500);
> +
> +	mipi_dbi_command(mipi, ST7735R_FRMCTR1, 0x01, 0x2c, 0x2d);
> +	mipi_dbi_command(mipi, ST7735R_FRMCTR2, 0x01, 0x2c, 0x2d);
> +	mipi_dbi_command(mipi, ST7735R_FRMCTR3, 0x01, 0x2c, 0x2d, 0x01, 0x2c,
> +			 0x2d);
> +	mipi_dbi_command(mipi, ST7735R_INVCTR, 0x07);
> +	mipi_dbi_command(mipi, ST7735R_PWCTR1, 0xa2, 0x02, 0x84);
> +	mipi_dbi_command(mipi, ST7735R_PWCTR2, 0xc5);
> +	mipi_dbi_command(mipi, ST7735R_PWCTR3, 0x0a, 0x00);
> +	mipi_dbi_command(mipi, ST7735R_PWCTR4, 0x8a, 0x2a);
> +	mipi_dbi_command(mipi, ST7735R_PWCTR5, 0x8a, 0xee);
> +	mipi_dbi_command(mipi, ST7735R_VMCTR1, 0x0e);
> +	mipi_dbi_command(mipi, MIPI_DCS_EXIT_INVERT_MODE);
> +	switch (mipi->rotation) {
> +	default:
> +		addr_mode = ST7735R_MX | ST7735R_MY;
> +		break;
> +	case 90:
> +		addr_mode = ST7735R_MX | ST7735R_MV;
> +		break;
> +	case 180:
> +		addr_mode = 0;
> +		break;
> +	case 270:
> +		addr_mode = ST7735R_MY | ST7735R_MV;
> +		break;
> +	}
> +	mipi_dbi_command(mipi, MIPI_DCS_SET_ADDRESS_MODE, addr_mode);
> +	mipi_dbi_command(mipi, MIPI_DCS_SET_PIXEL_FORMAT,
> +			 MIPI_DCS_PIXEL_FMT_16BIT);
> +	mipi_dbi_command(mipi, ST7735R_GAMCTRP1, 0x0f, 0x1a, 0x0f, 0x18, 0x2f,
> +			 0x28, 0x20, 0x22, 0x1f, 0x1b, 0x23, 0x37, 0x00, 0x07,
> +			 0x02, 0x10);
> +	mipi_dbi_command(mipi, ST7735R_GAMCTRN1, 0x0f, 0x1b, 0x0f, 0x17, 0x33,
> +			 0x2c, 0x29, 0x2e, 0x30, 0x30, 0x39, 0x3f, 0x00, 0x07,
> +			 0x03, 0x10);
> +	mipi_dbi_command(mipi, MIPI_DCS_SET_DISPLAY_ON);
> +
> +	msleep(100);
> +
> +	mipi_dbi_command(mipi, MIPI_DCS_ENTER_NORMAL_MODE);
> +
> +	msleep(20);
> +
> +	mipi_dbi_pipe_enable(pipe, crtc_state);
> +}
> +
> +static const struct drm_simple_display_pipe_funcs st7735r_pipe_funcs = {
> +	.enable		= st7735r_pipe_enable,
> +	.disable	= mipi_dbi_pipe_disable,
> +	.update		= tinydrm_display_pipe_update,
> +	.prepare_fb	= tinydrm_display_pipe_prepare_fb,
> +};
> +
> +static const struct drm_display_mode jd_t18003_t01_mode = {
> +	TINYDRM_MODE(128, 160, 28, 35),
> +};
> +
> +DEFINE_DRM_GEM_CMA_FOPS(st7735r_fops);
> +
> +static struct drm_driver st7735r_driver = {
> +	.driver_features	= DRIVER_GEM | DRIVER_MODESET | DRIVER_PRIME |
> +				  DRIVER_ATOMIC,
> +	.fops			= &st7735r_fops,
> +	TINYDRM_GEM_DRIVER_OPS,
> +	.lastclose		= drm_fb_helper_lastclose,
> +	.debugfs_init		= mipi_dbi_debugfs_init,
> +	.name			= "st7735r",
> +	.desc			= "Sitronix ST7735R",
> +	.date			= "20171128",
> +	.major			= 1,
> +	.minor			= 0,
> +};
> +
> +static const struct of_device_id st7735r_of_match[] = {
> +	{ .compatible = "jianda,jd-t18003-t01" },
> +	{},
> +};
> +MODULE_DEVICE_TABLE(of, st7735r_of_match);
> +
> +static const struct spi_device_id st7735r_id[] = {
> +	{ "jd-t18003-t01", 0 },
> +	{ },
> +};
> +MODULE_DEVICE_TABLE(spi, st7735r_id);
> +
> +static int st7735r_probe(struct spi_device *spi)
> +{
> +	struct device *dev = &spi->dev;
> +	struct mipi_dbi *mipi;
> +	struct gpio_desc *dc;
> +	u32 rotation = 0;
> +	int ret;
> +
> +	mipi = devm_kzalloc(dev, sizeof(*mipi), GFP_KERNEL);
> +	if (!mipi)
> +		return -ENOMEM;
> +
> +	mipi->reset = devm_gpiod_get(dev, "reset", GPIOD_OUT_HIGH);
> +	if (IS_ERR(mipi->reset)) {
> +		DRM_DEV_ERROR(dev, "Failed to get gpio 'reset'\n");
> +		return PTR_ERR(mipi->reset);
> +	}
> +
> +	dc = devm_gpiod_get(dev, "dc", GPIOD_OUT_LOW);
> +	if (IS_ERR(dc)) {
> +		DRM_DEV_ERROR(dev, "Failed to get gpio 'dc'\n");
> +		return PTR_ERR(dc);
> +	}
> +
> +	mipi->backlight = tinydrm_of_find_backlight(dev);
> +	if (IS_ERR(mipi->backlight))
> +		return PTR_ERR(mipi->backlight);
> +
> +	device_property_read_u32(dev, "rotation", &rotation);
> +
> +	ret = mipi_dbi_spi_init(spi, mipi, dc);
> +	if (ret)
> +		return ret;
> +
> +	/* Cannot read from Adafruit 1.8" display via SPI */
> +	mipi->read_commands = NULL;
> +
> +	ret = mipi_dbi_init(&spi->dev, mipi, &st7735r_pipe_funcs,
> +			    &st7735r_driver, &jd_t18003_t01_mode, rotation);
> +	if (ret)
> +		return ret;
> +
> +	spi_set_drvdata(spi, mipi);
> +
> +	return devm_tinydrm_register(&mipi->tinydrm);
> +}
> +
> +static void st7735r_shutdown(struct spi_device *spi)
> +{
> +	struct mipi_dbi *mipi = spi_get_drvdata(spi);
> +
> +	tinydrm_shutdown(&mipi->tinydrm);
> +}
> +
> +static struct spi_driver st7735r_spi_driver = {
> +	.driver = {
> +		.name = "st7735r",
> +		.owner = THIS_MODULE,
> +		.of_match_table = st7735r_of_match,
> +	},
> +	.id_table = st7735r_id,
> +	.probe = st7735r_probe,
> +	.shutdown = st7735r_shutdown,
> +};
> +module_spi_driver(st7735r_spi_driver);
> +
> +MODULE_DESCRIPTION("Sitronix ST7735R DRM driver");
> +MODULE_AUTHOR("David Lechner <david@lechnology.com>");
> +MODULE_LICENSE("GPL");