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drm/tinydrm/mipi-dbi: Add mipi_dbi_init_with_formats() 

The MIPI DBI standard support more pixel formats than what this helper
supports. Add an init function that lets the driver use different
format(s). This avoids open coding mipi_dbi_init() in st7586.

st7586 sets preferred_depth but this is not necessary since it only
supports one format.

v2: Forgot to remove the mipi->rotation assignment in st7586,
    mipi_dbi_init_with_formats() handles it.

Cc: David Lechner <david@lechnology.com>
Acked-by: David Lechner <david@lechnology.com>
Signed-off-by: Noralf Trønnes <noralf@tronnes.org>
Tested-by: David Lechner <david@lechnology.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20190719155916.62465-11-noralf@tronnes.org
This commit is contained in:
Noralf Trønnes 2019-07-19 17:59:15 +02:00
parent 1321db8375
commit cc43121271
3 changed files with 74 additions and 55 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

89
drivers/gpu/drm/tinydrm/mipi-dbi.c
View File

@ -411,6 +411,65 @@ static const uint32_t mipi_dbi_formats[] = {
DRM_FORMAT_XRGB8888,
};
/**
* mipi_dbi_init_with_formats - MIPI DBI initialization with custom formats
* @mipi: &mipi_dbi structure to initialize
* @funcs: Display pipe functions
* @formats: Array of supported formats (DRM_FORMAT\_\*).
* @format_count: Number of elements in @formats
* @mode: Display mode
* @rotation: Initial rotation in degrees Counter Clock Wise
* @tx_buf_size: Allocate a transmit buffer of this size.
*
* 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.
* This mode is used to set the mode config min/max width/height properties.
*
* Use mipi_dbi_init() if you don't need custom formats.
*
* Note:
* Some of the helper functions expects RGB565 to be the default format and the
* transmit buffer sized to fit that.
*
* Returns:
* Zero on success, negative error code on failure.
*/
int mipi_dbi_init_with_formats(struct mipi_dbi *mipi,
const struct drm_simple_display_pipe_funcs *funcs,
const uint32_t *formats, unsigned int format_count,
const struct drm_display_mode *mode,
unsigned int rotation, size_t tx_buf_size)
{
struct drm_device *drm = &mipi->drm;
int ret;
if (!mipi->command)
return -EINVAL;
mutex_init(&mipi->cmdlock);
mipi->tx_buf = devm_kmalloc(drm->dev, tx_buf_size, GFP_KERNEL);
if (!mipi->tx_buf)
return -ENOMEM;
ret = tinydrm_display_pipe_init(drm, &mipi->pipe, funcs,
DRM_MODE_CONNECTOR_SPI,
formats, format_count, mode,
rotation);
if (ret)
return ret;
drm_plane_enable_fb_damage_clips(&mipi->pipe.plane);
drm->mode_config.funcs = &mipi_dbi_mode_config_funcs;
mipi->rotation = rotation;
DRM_DEBUG_KMS("rotation = %u\n", rotation);
return 0;
}
EXPORT_SYMBOL(mipi_dbi_init_with_formats);
/**
* mipi_dbi_init - MIPI DBI initialization
* @mipi: &mipi_dbi structure to initialize
@ -433,36 +492,12 @@ int mipi_dbi_init(struct mipi_dbi *mipi,
const struct drm_display_mode *mode, unsigned int rotation)
{
size_t bufsize = mode->vdisplay * mode->hdisplay * sizeof(u16);
struct drm_device *drm = &mipi->drm;
int ret;
if (!mipi->command)
return -EINVAL;
mipi->drm.mode_config.preferred_depth = 16;
mutex_init(&mipi->cmdlock);
mipi->tx_buf = devm_kmalloc(drm->dev, bufsize, GFP_KERNEL);
if (!mipi->tx_buf)
return -ENOMEM;
ret = tinydrm_display_pipe_init(drm, &mipi->pipe, funcs,
DRM_MODE_CONNECTOR_SPI,
mipi_dbi_formats,
return mipi_dbi_init_with_formats(mipi, funcs, mipi_dbi_formats,
ARRAY_SIZE(mipi_dbi_formats), mode,
rotation);
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.preferred_depth = 16;
mipi->rotation = rotation;
DRM_DEBUG_KMS("preferred_depth=%u, rotation = %u\n",
drm->mode_config.preferred_depth, rotation);
return 0;
rotation, bufsize);
}
EXPORT_SYMBOL(mipi_dbi_init);

33
drivers/gpu/drm/tinydrm/st7586.c
View File

@ -24,7 +24,6 @@
#include <drm/drm_rect.h>
#include <drm/drm_vblank.h>
#include <drm/tinydrm/mipi-dbi.h>
#include <drm/tinydrm/tinydrm-helpers.h>
/* controller-specific commands */
#define ST7586_DISP_MODE_GRAY 0x38
@ -283,12 +282,6 @@ static const struct drm_simple_display_pipe_funcs st7586_pipe_funcs = {
.prepare_fb = drm_gem_fb_simple_display_pipe_prepare_fb,
};
static const struct drm_mode_config_funcs st7586_mode_config_funcs = {
.fb_create = drm_gem_fb_create_with_dirty,
.atomic_check = drm_atomic_helper_check,
.atomic_commit = drm_atomic_helper_commit,
};
static const struct drm_display_mode st7586_mode = {
DRM_SIMPLE_MODE(178, 128, 37, 27),
};
@ -342,15 +335,8 @@ static int st7586_probe(struct spi_device *spi)
}
drm_mode_config_init(drm);
drm->mode_config.preferred_depth = 32;
drm->mode_config.funcs = &st7586_mode_config_funcs;
mutex_init(&mipi->cmdlock);
bufsize = (st7586_mode.vdisplay + 2) / 3 * st7586_mode.hdisplay;
mipi->tx_buf = devm_kmalloc(dev, bufsize, GFP_KERNEL);
if (!mipi->tx_buf)
return -ENOMEM;
mipi->reset = devm_gpiod_get(dev, "reset", GPIOD_OUT_HIGH);
if (IS_ERR(mipi->reset)) {
@ -365,7 +351,6 @@ static int st7586_probe(struct spi_device *spi)
}
device_property_read_u32(dev, "rotation", &rotation);
mipi->rotation = rotation;
ret = mipi_dbi_spi_init(spi, mipi, a0);
if (ret)
@ -374,6 +359,12 @@ static int st7586_probe(struct spi_device *spi)
/* Cannot read from this controller via SPI */
mipi->read_commands = NULL;
ret = mipi_dbi_init_with_formats(mipi, &st7586_pipe_funcs,
st7586_formats, ARRAY_SIZE(st7586_formats),
&st7586_mode, rotation, bufsize);
if (ret)
return ret;
/*
* we are using 8-bit data, so we are not actually swapping anything,
* but setting mipi->swap_bytes makes mipi_dbi_typec3_command() do the
@ -383,15 +374,6 @@ static int st7586_probe(struct spi_device *spi)
*/
mipi->swap_bytes = true;
ret = tinydrm_display_pipe_init(drm, &mipi->pipe, &st7586_pipe_funcs,
DRM_MODE_CONNECTOR_SPI,
st7586_formats, ARRAY_SIZE(st7586_formats),
&st7586_mode, rotation);
if (ret)
return ret;
drm_plane_enable_fb_damage_clips(&mipi->pipe.plane);
drm_mode_config_reset(drm);
ret = drm_dev_register(drm, 0);
@ -400,9 +382,6 @@ static int st7586_probe(struct spi_device *spi)
spi_set_drvdata(spi, drm);
DRM_DEBUG_KMS("preferred_depth=%u, rotation = %u\n",
drm->mode_config.preferred_depth, rotation);
drm_fbdev_generic_setup(drm, 0);
return 0;

5
include/drm/tinydrm/mipi-dbi.h
View File

@ -69,6 +69,11 @@ static inline struct mipi_dbi *drm_to_mipi_dbi(struct drm_device *drm)
int mipi_dbi_spi_init(struct spi_device *spi, struct mipi_dbi *mipi,
struct gpio_desc *dc);
int mipi_dbi_init_with_formats(struct mipi_dbi *mipi,
const struct drm_simple_display_pipe_funcs *funcs,
const uint32_t *formats, unsigned int format_count,
const struct drm_display_mode *mode,
unsigned int rotation, size_t tx_buf_size);
int mipi_dbi_init(struct mipi_dbi *mipi,
const struct drm_simple_display_pipe_funcs *funcs,
const struct drm_display_mode *mode, unsigned int rotation);