Re: [PATCH v3 4/7] drm/tinydrm/mipi-dbi: Add poweron-reset functions

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On 01/10/2018 12:59 PM, Noralf Trønnes wrote:
Split out common poweron-reset functionality.

Signed-off-by: Noralf Trønnes <noralf@xxxxxxxxxxx>
---
  drivers/gpu/drm/tinydrm/mi0283qt.c | 22 ++----------
  drivers/gpu/drm/tinydrm/mipi-dbi.c | 73 ++++++++++++++++++++++++++++++++++++++
  drivers/gpu/drm/tinydrm/st7586.c   |  9 ++---
  drivers/gpu/drm/tinydrm/st7735r.c  |  8 ++---
  include/drm/tinydrm/mipi-dbi.h     |  2 ++
  5 files changed, 83 insertions(+), 31 deletions(-)

diff --git a/drivers/gpu/drm/tinydrm/mi0283qt.c b/drivers/gpu/drm/tinydrm/mi0283qt.c
index c69a4d958f24..1617405faed4 100644
--- a/drivers/gpu/drm/tinydrm/mi0283qt.c
+++ b/drivers/gpu/drm/tinydrm/mi0283qt.c
@@ -49,33 +49,17 @@
static int mi0283qt_init(struct mipi_dbi *mipi)
  {
-	struct tinydrm_device *tdev = &mipi->tinydrm;
-	struct device *dev = tdev->drm->dev;
  	u8 addr_mode;
  	int ret;
DRM_DEBUG_KMS("\n"); - ret = regulator_enable(mipi->regulator);
-	if (ret) {
-		DRM_DEV_ERROR(dev, "Failed to enable regulator %d\n", ret);
+	ret = mipi_dbi_poweron_conditional_reset(mipi);
+	if (ret < 0)
  		return ret;
-	}
-
-	/* Avoid flicker by skipping setup if the bootloader has done it */

It could be helpful to keep this comment.

-	if (mipi_dbi_display_is_on(mipi))
+	if (ret == 1)
  		return 0;
- 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);
-		regulator_disable(mipi->regulator);
-		return ret;
-	}
-
-	msleep(20);
-
  	mipi_dbi_command(mipi, MIPI_DCS_SET_DISPLAY_OFF);
mipi_dbi_command(mipi, ILI9341_PWCTRLB, 0x00, 0x83, 0x30);
diff --git a/drivers/gpu/drm/tinydrm/mipi-dbi.c b/drivers/gpu/drm/tinydrm/mipi-dbi.c
index 1c8ef0c4d6d4..3e879d605ed3 100644
--- a/drivers/gpu/drm/tinydrm/mipi-dbi.c
+++ b/drivers/gpu/drm/tinydrm/mipi-dbi.c
@@ -463,6 +463,7 @@ bool mipi_dbi_display_is_on(struct mipi_dbi *mipi)
val &= ~DCS_POWER_MODE_RESERVED_MASK; + /* The poweron/reset value is 08h DCS_POWER_MODE_DISPLAY_NORMAL_MODE */
  	if (val != (DCS_POWER_MODE_DISPLAY |
  	    DCS_POWER_MODE_DISPLAY_NORMAL_MODE | DCS_POWER_MODE_SLEEP_MODE))
  		return false;
@@ -473,6 +474,78 @@ bool mipi_dbi_display_is_on(struct mipi_dbi *mipi)
  }
  EXPORT_SYMBOL(mipi_dbi_display_is_on);
+static int mipi_dbi_poweron_reset_conditional(struct mipi_dbi *mipi, bool cond)
+{
+	struct device *dev = mipi->tinydrm.drm->dev;
+	int ret;
+
+	if (mipi->regulator) {
+		ret = regulator_enable(mipi->regulator);
+		if (ret) {
+			DRM_DEV_ERROR(dev, "Failed to enable regulator (%d)\n", ret);
+			return ret;
+		}
+	}
+
+	if (cond && mipi_dbi_display_is_on(mipi))
+		return 1;
+
+	mipi_dbi_hw_reset(mipi);
+	ret = mipi_dbi_command(mipi, MIPI_DCS_SOFT_RESET);
+	if (ret) {
+		DRM_DEV_ERROR(dev, "Failed to send reset command (%d)\n", ret);
+		if (mipi->regulator)
+			regulator_disable(mipi->regulator);
+		return ret;
+	}
+
+	/*
+	 * If we did a hw reset, we know the controller is in Sleep mode and
+	 * per MIPI DSC spec should wait 5ms after soft reset. If we didn't,
+	 * we assume worst case and wait 120ms.
+	 */
+	if (mipi->reset)
+		usleep_range(5000, 20000);
+	else
+		msleep(120);
+
+	return 0;
+}
+
+/**
+ * mipi_dbi_poweron_reset - MIPI DBI poweron and reset
+ * @mipi: MIPI DBI structure
+ *
+ * This function enables the regulator if used and does a hardware and software
+ * reset.
+ *
+ * Returns:
+ * Zero on success, or a negative error code.
+ */
+int mipi_dbi_poweron_reset(struct mipi_dbi *mipi)
+{
+	return mipi_dbi_poweron_reset_conditional(mipi, false);
+}
+EXPORT_SYMBOL(mipi_dbi_poweron_reset);
+
+/**
+ * mipi_dbi_poweron_conditional_reset - MIPI DBI poweron and conditional reset
+ * @mipi: MIPI DBI structure
+ *
+ * This function enables the regulator if used and if the display is off, it
+ * does a hardware and software reset. If mipi_dbi_display_is_on() determines
+ * that the display is on, no reset is performed.
+ *
+ * Returns:
+ * Zero if the controller was reset, 1 if the display was already on, or a
+ * negative error code.
+ */
+int mipi_dbi_poweron_conditional_reset(struct mipi_dbi *mipi)
+{
+	return mipi_dbi_poweron_reset_conditional(mipi, true);
+}
+EXPORT_SYMBOL(mipi_dbi_poweron_conditional_reset);
+
  #if IS_ENABLED(CONFIG_SPI)
/**
diff --git a/drivers/gpu/drm/tinydrm/st7586.c b/drivers/gpu/drm/tinydrm/st7586.c
index 9fd4423c8e70..a6396ef9cc4a 100644
--- a/drivers/gpu/drm/tinydrm/st7586.c
+++ b/drivers/gpu/drm/tinydrm/st7586.c
@@ -179,19 +179,16 @@ static void st7586_pipe_enable(struct drm_simple_display_pipe *pipe,
  {
  	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, ST7586_AUTO_READ_CTRL, 0x9f);
-	if (ret) {
-		DRM_DEV_ERROR(dev, "Error sending command %d\n", ret);
+	ret = mipi_dbi_poweron_reset(mipi);
+	if (ret)
  		return;
-	}
+ mipi_dbi_command(mipi, ST7586_AUTO_READ_CTRL, 0x9f);
  	mipi_dbi_command(mipi, ST7586_OTP_RW_CTRL, 0x00);
msleep(10);
diff --git a/drivers/gpu/drm/tinydrm/st7735r.c b/drivers/gpu/drm/tinydrm/st7735r.c
index 1f38e15da676..650257ad0193 100644
--- a/drivers/gpu/drm/tinydrm/st7735r.c
+++ b/drivers/gpu/drm/tinydrm/st7735r.c

Also need:

@@ -40,7 +40,6 @@ static void jd_t18003_t01_pipe_enable(struct drm_simple_display_pipe *pipe,
 {
 	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;
to prevent compiler warning.

@@ -46,13 +46,9 @@ static void jd_t18003_t01_pipe_enable(struct drm_simple_display_pipe *pipe,
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);
+	ret = mipi_dbi_poweron_reset(mipi);
+	if (ret)
  		return;
-	}
msleep(150); diff --git a/include/drm/tinydrm/mipi-dbi.h b/include/drm/tinydrm/mipi-dbi.h
index 6441d9a9161a..795a4a2205bb 100644
--- a/include/drm/tinydrm/mipi-dbi.h
+++ b/include/drm/tinydrm/mipi-dbi.h
@@ -73,6 +73,8 @@ void mipi_dbi_pipe_enable(struct drm_simple_display_pipe *pipe,
  void mipi_dbi_pipe_disable(struct drm_simple_display_pipe *pipe);
  void mipi_dbi_hw_reset(struct mipi_dbi *mipi);
  bool mipi_dbi_display_is_on(struct mipi_dbi *mipi);
+int mipi_dbi_poweron_reset(struct mipi_dbi *mipi);
+int mipi_dbi_poweron_conditional_reset(struct mipi_dbi *mipi);
  u32 mipi_dbi_spi_cmd_max_speed(struct spi_device *spi, size_t len);
int mipi_dbi_command_read(struct mipi_dbi *mipi, u8 cmd, u8 *val);


With the compiler warning fixed:

Reviewed-by: David Lechner <david@xxxxxxxxxxxxxx>

Also, the whole series:

Tested-by: David Lechner <david@xxxxxxxxxxxxxx>

using st7735r which has a hardware reset and backlight, but no regulator.
And it is write-only, so cannot detect that the display is already on.
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