Re: [PATCH 10/10] drm/tinydrm: Move tinydrm_display_pipe_init() to mipi-dbi

[Sam Ravnborg <sam@ravnborg.org>]

On Wed, Jul 17, 2019 at 01:58:17PM +0200, Noralf Trønnes wrote:
> tinydrm_display_pipe_init() has only one user now, so move it to mipi-dbi.
> 
> Changes:
> - Remove drm_connector_helper_funcs.detect, it's always connected.
> - Store the connector and mode in mipi_dbi instead of it's own struct.
> 
> Otherwise remove some leftover tinydrm-helpers.h inclusions.

For review purposes it would have been easier had this been split in a
few more patches.
But anyway, I think I managed to follow all changes.
So it has my:
Reviewed-by: Sam Ravnborg <sam@ravnborg.org>

> 
> Cc: Eric Anholt <eric@anholt.net>
> Cc: David Lechner <david@lechnology.com>
> Signed-off-by: Noralf Trønnes <noralf@tronnes.org>
> ---
>  Documentation/gpu/tinydrm.rst               |   9 -
>  drivers/gpu/drm/tinydrm/Makefile            |   1 -
>  drivers/gpu/drm/tinydrm/core/Makefile       |   4 -
>  drivers/gpu/drm/tinydrm/core/tinydrm-pipe.c | 183 --------------------
>  drivers/gpu/drm/tinydrm/hx8357d.c           |   1 -
>  drivers/gpu/drm/tinydrm/ili9341.c           |   1 -
>  drivers/gpu/drm/tinydrm/mi0283qt.c          |   1 -
>  drivers/gpu/drm/tinydrm/mipi-dbi.c          |  87 +++++++++-
>  drivers/gpu/drm/tinydrm/st7735r.c           |   1 -
>  include/drm/tinydrm/mipi-dbi.h              |  10 ++
>  include/drm/tinydrm/tinydrm-helpers.h       |  27 ---
>  11 files changed, 91 insertions(+), 234 deletions(-)
>  delete mode 100644 drivers/gpu/drm/tinydrm/core/Makefile
>  delete mode 100644 drivers/gpu/drm/tinydrm/core/tinydrm-pipe.c
>  delete mode 100644 include/drm/tinydrm/tinydrm-helpers.h
> 
> diff --git a/Documentation/gpu/tinydrm.rst b/Documentation/gpu/tinydrm.rst
> index 2c2860fa1510..64bdf6356024 100644
> --- a/Documentation/gpu/tinydrm.rst
> +++ b/Documentation/gpu/tinydrm.rst
> @@ -5,15 +5,6 @@ drm/tinydrm Tiny DRM drivers
>  tinydrm is a collection of DRM drivers that are so small they can fit in a
>  single source file.
>  
> -Helpers
> -=======
> -
> -.. kernel-doc:: include/drm/tinydrm/tinydrm-helpers.h
> -   :internal:
> -
> -.. kernel-doc:: drivers/gpu/drm/tinydrm/core/tinydrm-pipe.c
> -   :export:
> -
>  MIPI DBI Compatible Controllers
>  ===============================
>  
> diff --git a/drivers/gpu/drm/tinydrm/Makefile b/drivers/gpu/drm/tinydrm/Makefile
> index 48ec8ed9dc16..ab6b9bebf321 100644
> --- a/drivers/gpu/drm/tinydrm/Makefile
> +++ b/drivers/gpu/drm/tinydrm/Makefile
> @@ -1,5 +1,4 @@
>  # SPDX-License-Identifier: GPL-2.0-only
> -obj-$(CONFIG_DRM_TINYDRM)		+= core/
>  
>  # Controllers
>  obj-$(CONFIG_TINYDRM_MIPI_DBI)		+= mipi-dbi.o
> diff --git a/drivers/gpu/drm/tinydrm/core/Makefile b/drivers/gpu/drm/tinydrm/core/Makefile
> deleted file mode 100644
> index 78e179127e55..000000000000
> --- a/drivers/gpu/drm/tinydrm/core/Makefile
> +++ /dev/null
> @@ -1,4 +0,0 @@
> -# SPDX-License-Identifier: GPL-2.0-only
> -tinydrm-y := tinydrm-pipe.o
> -
> -obj-$(CONFIG_DRM_TINYDRM) += tinydrm.o
> diff --git a/drivers/gpu/drm/tinydrm/core/tinydrm-pipe.c b/drivers/gpu/drm/tinydrm/core/tinydrm-pipe.c
> deleted file mode 100644
> index a62d1dfe87f8..000000000000
> --- a/drivers/gpu/drm/tinydrm/core/tinydrm-pipe.c
> +++ /dev/null
> @@ -1,183 +0,0 @@
> -// SPDX-License-Identifier: GPL-2.0-or-later
> -/*
> - * Copyright (C) 2016 Noralf Trønnes
> - */
> -
> -#include <linux/module.h>
> -
> -#include <drm/drm_atomic_helper.h>
> -#include <drm/drm_drv.h>
> -#include <drm/drm_gem_framebuffer_helper.h>
> -#include <drm/drm_modes.h>
> -#include <drm/drm_probe_helper.h>
> -#include <drm/drm_print.h>
> -#include <drm/drm_simple_kms_helper.h>
> -
> -struct tinydrm_connector {
> -	struct drm_connector base;
> -	struct drm_display_mode mode;
> -};
> -
> -static inline struct tinydrm_connector *
> -to_tinydrm_connector(struct drm_connector *connector)
> -{
> -	return container_of(connector, struct tinydrm_connector, base);
> -}
> -
> -static int tinydrm_connector_get_modes(struct drm_connector *connector)
> -{
> -	struct tinydrm_connector *tconn = to_tinydrm_connector(connector);
> -	struct drm_display_mode *mode;
> -
> -	mode = drm_mode_duplicate(connector->dev, &tconn->mode);
> -	if (!mode) {
> -		DRM_ERROR("Failed to duplicate mode\n");
> -		return 0;
> -	}
> -
> -	if (mode->name[0] == '\0')
> -		drm_mode_set_name(mode);
> -
> -	mode->type |= DRM_MODE_TYPE_PREFERRED;
> -	drm_mode_probed_add(connector, mode);
> -
> -	if (mode->width_mm) {
> -		connector->display_info.width_mm = mode->width_mm;
> -		connector->display_info.height_mm = mode->height_mm;
> -	}
> -
> -	return 1;
> -}
> -
> -static const struct drm_connector_helper_funcs tinydrm_connector_hfuncs = {
> -	.get_modes = tinydrm_connector_get_modes,
> -};
> -
> -static enum drm_connector_status
> -tinydrm_connector_detect(struct drm_connector *connector, bool force)
> -{
> -	if (drm_dev_is_unplugged(connector->dev))
> -		return connector_status_disconnected;
> -
> -	return connector->status;
> -}
> -
> -static void tinydrm_connector_destroy(struct drm_connector *connector)
> -{
> -	struct tinydrm_connector *tconn = to_tinydrm_connector(connector);
> -
> -	drm_connector_cleanup(connector);
> -	kfree(tconn);
> -}
> -
> -static const struct drm_connector_funcs tinydrm_connector_funcs = {
> -	.reset = drm_atomic_helper_connector_reset,
> -	.detect = tinydrm_connector_detect,
> -	.fill_modes = drm_helper_probe_single_connector_modes,
> -	.destroy = tinydrm_connector_destroy,
> -	.atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
> -	.atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
> -};
> -
> -struct drm_connector *
> -tinydrm_connector_create(struct drm_device *drm,
> -			 const struct drm_display_mode *mode,
> -			 int connector_type)
> -{
> -	struct tinydrm_connector *tconn;
> -	struct drm_connector *connector;
> -	int ret;
> -
> -	tconn = kzalloc(sizeof(*tconn), GFP_KERNEL);
> -	if (!tconn)
> -		return ERR_PTR(-ENOMEM);
> -
> -	drm_mode_copy(&tconn->mode, mode);
> -	connector = &tconn->base;
> -
> -	drm_connector_helper_add(connector, &tinydrm_connector_hfuncs);
> -	ret = drm_connector_init(drm, connector, &tinydrm_connector_funcs,
> -				 connector_type);
> -	if (ret) {
> -		kfree(tconn);
> -		return ERR_PTR(ret);
> -	}
> -
> -	connector->status = connector_status_connected;
> -
> -	return connector;
> -}
> -
> -static int tinydrm_rotate_mode(struct drm_display_mode *mode,
> -			       unsigned int rotation)
> -{
> -	if (rotation == 0 || rotation == 180) {
> -		return 0;
> -	} else if (rotation == 90 || rotation == 270) {
> -		swap(mode->hdisplay, mode->vdisplay);
> -		swap(mode->hsync_start, mode->vsync_start);
> -		swap(mode->hsync_end, mode->vsync_end);
> -		swap(mode->htotal, mode->vtotal);
> -		swap(mode->width_mm, mode->height_mm);
> -		return 0;
> -	} else {
> -		return -EINVAL;
> -	}
> -}
> -
> -/**
> - * tinydrm_display_pipe_init - Initialize display pipe
> - * @drm: DRM device
> - * @pipe: Display pipe
> - * @funcs: Display pipe functions
> - * @connector_type: Connector type
> - * @formats: Array of supported formats (DRM_FORMAT\_\*)
> - * @format_count: Number of elements in @formats
> - * @mode: Supported mode
> - * @rotation: Initial @mode rotation in degrees Counter Clock Wise
> - *
> - * This function sets up a &drm_simple_display_pipe with a &drm_connector that
> - * has one fixed &drm_display_mode which is rotated according to @rotation.
> - *
> - * Returns:
> - * Zero on success, negative error code on failure.
> - */
> -int tinydrm_display_pipe_init(struct drm_device *drm,
> -			      struct drm_simple_display_pipe *pipe,
> -			      const struct drm_simple_display_pipe_funcs *funcs,
> -			      int connector_type,
> -			      const uint32_t *formats,
> -			      unsigned int format_count,
> -			      const struct drm_display_mode *mode,
> -			      unsigned int rotation)
> -{
> -	struct drm_display_mode mode_copy;
> -	struct drm_connector *connector;
> -	int ret;
> -	static const uint64_t modifiers[] = {
> -		DRM_FORMAT_MOD_LINEAR,
> -		DRM_FORMAT_MOD_INVALID
> -	};
> -
> -	drm_mode_copy(&mode_copy, mode);
> -	ret = tinydrm_rotate_mode(&mode_copy, rotation);
> -	if (ret) {
> -		DRM_ERROR("Illegal rotation value %u\n", rotation);
> -		return -EINVAL;
> -	}
> -
> -	drm->mode_config.min_width = mode_copy.hdisplay;
> -	drm->mode_config.max_width = mode_copy.hdisplay;
> -	drm->mode_config.min_height = mode_copy.vdisplay;
> -	drm->mode_config.max_height = mode_copy.vdisplay;
> -
> -	connector = tinydrm_connector_create(drm, &mode_copy, connector_type);
> -	if (IS_ERR(connector))
> -		return PTR_ERR(connector);
> -
> -	return drm_simple_display_pipe_init(drm, pipe, funcs, formats,
> -					    format_count, modifiers, connector);
> -}
> -EXPORT_SYMBOL(tinydrm_display_pipe_init);
> -
> -MODULE_LICENSE("GPL");
> diff --git a/drivers/gpu/drm/tinydrm/hx8357d.c b/drivers/gpu/drm/tinydrm/hx8357d.c
> index be197c5c3211..7d2dfa92b661 100644
> --- a/drivers/gpu/drm/tinydrm/hx8357d.c
> +++ b/drivers/gpu/drm/tinydrm/hx8357d.c
> @@ -23,7 +23,6 @@
>  #include <drm/drm_gem_framebuffer_helper.h>
>  #include <drm/drm_modeset_helper.h>
>  #include <drm/tinydrm/mipi-dbi.h>
> -#include <drm/tinydrm/tinydrm-helpers.h>
>  #include <video/mipi_display.h>
>  
>  #define HX8357D_SETOSC 0xb0
> diff --git a/drivers/gpu/drm/tinydrm/ili9341.c b/drivers/gpu/drm/tinydrm/ili9341.c
> index 00f28b8e4345..cb0a0ddbc090 100644
> --- a/drivers/gpu/drm/tinydrm/ili9341.c
> +++ b/drivers/gpu/drm/tinydrm/ili9341.c
> @@ -22,7 +22,6 @@
>  #include <drm/drm_gem_framebuffer_helper.h>
>  #include <drm/drm_modeset_helper.h>
>  #include <drm/tinydrm/mipi-dbi.h>
> -#include <drm/tinydrm/tinydrm-helpers.h>
>  #include <video/mipi_display.h>
>  
>  #define ILI9341_FRMCTR1		0xb1
> diff --git a/drivers/gpu/drm/tinydrm/mi0283qt.c b/drivers/gpu/drm/tinydrm/mi0283qt.c
> index 7a14d6b355f2..f21d58dcaa5a 100644
> --- a/drivers/gpu/drm/tinydrm/mi0283qt.c
> +++ b/drivers/gpu/drm/tinydrm/mi0283qt.c
> @@ -20,7 +20,6 @@
>  #include <drm/drm_gem_framebuffer_helper.h>
>  #include <drm/drm_modeset_helper.h>
>  #include <drm/tinydrm/mipi-dbi.h>
> -#include <drm/tinydrm/tinydrm-helpers.h>
>  #include <video/mipi_display.h>
>  
>  #define ILI9341_FRMCTR1		0xb1
> diff --git a/drivers/gpu/drm/tinydrm/mipi-dbi.c b/drivers/gpu/drm/tinydrm/mipi-dbi.c
> index a264c0bb74b0..42465228129c 100644
> --- a/drivers/gpu/drm/tinydrm/mipi-dbi.c
> +++ b/drivers/gpu/drm/tinydrm/mipi-dbi.c
> @@ -13,6 +13,7 @@
>  #include <linux/regulator/consumer.h>
>  #include <linux/spi/spi.h>
>  
> +#include <drm/drm_connector.h>
>  #include <drm/drm_damage_helper.h>
>  #include <drm/drm_drv.h>
>  #include <drm/drm_fb_cma_helper.h>
> @@ -20,10 +21,11 @@
>  #include <drm/drm_format_helper.h>
>  #include <drm/drm_fourcc.h>
>  #include <drm/drm_gem_framebuffer_helper.h>
> -#include <drm/drm_vblank.h>
> +#include <drm/drm_modes.h>
> +#include <drm/drm_probe_helper.h>
>  #include <drm/drm_rect.h>
> +#include <drm/drm_vblank.h>
>  #include <drm/tinydrm/mipi-dbi.h>
> -#include <drm/tinydrm/tinydrm-helpers.h>
>  #include <video/mipi_display.h>
>  
>  #define MIPI_DBI_MAX_SPI_READ_SPEED 2000000 /* 2MHz */
> @@ -400,6 +402,60 @@ void mipi_dbi_pipe_disable(struct drm_simple_display_pipe *pipe)
>  }
>  EXPORT_SYMBOL(mipi_dbi_pipe_disable);
>  
> +static int mipi_dbi_connector_get_modes(struct drm_connector *connector)
> +{
> +	struct mipi_dbi *mipi = drm_to_mipi_dbi(connector->dev);
> +	struct drm_display_mode *mode;
> +
> +	mode = drm_mode_duplicate(connector->dev, &mipi->mode);
> +	if (!mode) {
> +		DRM_ERROR("Failed to duplicate mode\n");
> +		return 0;
> +	}
> +
> +	if (mode->name[0] == '\0')
> +		drm_mode_set_name(mode);
> +
> +	mode->type |= DRM_MODE_TYPE_PREFERRED;
> +	drm_mode_probed_add(connector, mode);
> +
> +	if (mode->width_mm) {
> +		connector->display_info.width_mm = mode->width_mm;
> +		connector->display_info.height_mm = mode->height_mm;
> +	}
> +
> +	return 1;
> +}
> +
> +static const struct drm_connector_helper_funcs mipi_dbi_connector_hfuncs = {
> +	.get_modes = mipi_dbi_connector_get_modes,
> +};
> +
> +static const struct drm_connector_funcs mipi_dbi_connector_funcs = {
> +	.reset = drm_atomic_helper_connector_reset,
> +	.fill_modes = drm_helper_probe_single_connector_modes,
> +	.destroy = drm_connector_cleanup,
> +	.atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
> +	.atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
> +};
> +
> +static int mipi_dbi_rotate_mode(struct drm_display_mode *mode,
> +				unsigned int rotation)
> +{
> +	if (rotation == 0 || rotation == 180) {
> +		return 0;
> +	} else if (rotation == 90 || rotation == 270) {
> +		swap(mode->hdisplay, mode->vdisplay);
> +		swap(mode->hsync_start, mode->vsync_start);
> +		swap(mode->hsync_end, mode->vsync_end);
> +		swap(mode->htotal, mode->vtotal);
> +		swap(mode->width_mm, mode->height_mm);
> +		return 0;
> +	} else {
> +		return -EINVAL;
> +	}
> +}
> +
>  static const struct drm_mode_config_funcs mipi_dbi_mode_config_funcs = {
>  	.fb_create = drm_gem_fb_create_with_dirty,
>  	.atomic_check = drm_atomic_helper_check,
> @@ -440,6 +496,10 @@ int mipi_dbi_init_with_formats(struct mipi_dbi *mipi,
>  			       const struct drm_display_mode *mode,
>  			       unsigned int rotation, size_t tx_buf_size)
>  {
> +	static const uint64_t modifiers[] = {
> +		DRM_FORMAT_MOD_LINEAR,
> +		DRM_FORMAT_MOD_INVALID
> +	};
>  	struct drm_device *drm = &mipi->drm;
>  	int ret;
>  
> @@ -452,16 +512,31 @@ int mipi_dbi_init_with_formats(struct mipi_dbi *mipi,
>  	if (!mipi->tx_buf)
>  		return -ENOMEM;
>  
> -	ret = tinydrm_display_pipe_init(drm, &mipi->pipe, funcs,
> -					DRM_MODE_CONNECTOR_SPI,
> -					formats, format_count, mode,
> -					rotation);
> +	drm_mode_copy(&mipi->mode, mode);
> +	ret = mipi_dbi_rotate_mode(&mipi->mode, rotation);
> +	if (ret) {
> +		DRM_ERROR("Illegal rotation value %u\n", rotation);
> +		return -EINVAL;
> +	}
> +
> +	drm_connector_helper_add(&mipi->connector, &mipi_dbi_connector_hfuncs);
> +	ret = drm_connector_init(drm, &mipi->connector, &mipi_dbi_connector_funcs,
> +				 DRM_MODE_CONNECTOR_SPI);
> +	if (ret)
> +		return ret;
> +
> +	ret = drm_simple_display_pipe_init(drm, &mipi->pipe, funcs, formats, format_count,
> +					   modifiers, &mipi->connector);
>  	if (ret)
>  		return ret;
>  
>  	drm_plane_enable_fb_damage_clips(&mipi->pipe.plane);
>  
>  	drm->mode_config.funcs = &mipi_dbi_mode_config_funcs;
> +	drm->mode_config.min_width = mipi->mode.hdisplay;
> +	drm->mode_config.max_width = mipi->mode.hdisplay;
> +	drm->mode_config.min_height = mipi->mode.vdisplay;
> +	drm->mode_config.max_height = mipi->mode.vdisplay;
>  	mipi->rotation = rotation;
>  
>  	DRM_DEBUG_KMS("rotation = %u\n", rotation);
> diff --git a/drivers/gpu/drm/tinydrm/st7735r.c b/drivers/gpu/drm/tinydrm/st7735r.c
> index b23899788f5b..151749035a19 100644
> --- a/drivers/gpu/drm/tinydrm/st7735r.c
> +++ b/drivers/gpu/drm/tinydrm/st7735r.c
> @@ -20,7 +20,6 @@
>  #include <drm/drm_gem_cma_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
> diff --git a/include/drm/tinydrm/mipi-dbi.h b/include/drm/tinydrm/mipi-dbi.h
> index 2f0119e2c47e..8ab3bde78723 100644
> --- a/include/drm/tinydrm/mipi-dbi.h
> +++ b/include/drm/tinydrm/mipi-dbi.h
> @@ -46,6 +46,16 @@ struct mipi_dbi {
>  	 */
>  	struct drm_simple_display_pipe pipe;
>  
> +	/**
> +	 * @connector: Connector
> +	 */
> +	struct drm_connector connector;
> +
> +	/**
> +	 * @mode: Fixed display mode
> +	 */
> +	struct drm_display_mode mode;
> +
>  	struct spi_device *spi;
>  	bool enabled;
>  	struct mutex cmdlock;
> diff --git a/include/drm/tinydrm/tinydrm-helpers.h b/include/drm/tinydrm/tinydrm-helpers.h
> deleted file mode 100644
> index 0e7470771c5e..000000000000
> --- a/include/drm/tinydrm/tinydrm-helpers.h
> +++ /dev/null
> @@ -1,27 +0,0 @@
> -/* SPDX-License-Identifier: GPL-2.0-or-later */
> -/*
> - * Copyright (C) 2016 Noralf Trønnes
> - */
> -
> -#ifndef __LINUX_TINYDRM_HELPERS_H
> -#define __LINUX_TINYDRM_HELPERS_H
> -
> -struct backlight_device;
> -struct drm_device;
> -struct drm_display_mode;
> -struct drm_framebuffer;
> -struct drm_rect;
> -struct drm_simple_display_pipe;
> -struct drm_simple_display_pipe_funcs;
> -struct device;
> -
> -int tinydrm_display_pipe_init(struct drm_device *drm,
> -			      struct drm_simple_display_pipe *pipe,
> -			      const struct drm_simple_display_pipe_funcs *funcs,
> -			      int connector_type,
> -			      const uint32_t *formats,
> -			      unsigned int format_count,
> -			      const struct drm_display_mode *mode,
> -			      unsigned int rotation);
> -
> -#endif /* __LINUX_TINYDRM_HELPERS_H */
> -- 
> 2.20.1
> 
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