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Commit 13deee81 authored by David Lechner's avatar David Lechner Committed by Noralf Trønnes
Browse files

drm/tinydrm: export mipi_dbi_buf_copy and mipi_dbi_spi_cmd_max_speed 



This exports the mipi_dbi_buf_copy() and mipi_dbi_spi_cmd_max_speed()
functions so that they can be shared with other drivers.

Signed-off-by: default avatarDavid Lechner <david@lechnology.com>
Reviewed-by: default avatarNoralf Trønnes <noralf@tronnes.org>
Signed-off-by: default avatarNoralf Trønnes <noralf@tronnes.org>
Link: https://patchwork.freedesktop.org/patch/msgid/1511122328-31133-4-git-send-email-david@lechnology.com
parent 3fd8d9e0

drivers/gpu/drm/tinydrm/mipi-dbi.c

+20 −4
Original line number Diff line number Diff line
@@ -154,7 +154,17 @@ int mipi_dbi_command_buf(struct mipi_dbi *mipi, u8 cmd, u8 *data, size_t len) 
}

EXPORT_SYMBOL(mipi_dbi_command_buf);



static int mipi_dbi_buf_copy(void *dst, struct drm_framebuffer *fb,

/**

 * mipi_dbi_buf_copy - Copy a framebuffer, transforming it if necessary

 * @dst: The destination buffer

 * @fb: The source framebuffer

 * @clip: Clipping rectangle of the area to be copied

 * @swap: When true, swap MSB/LSB of 16-bit values

 *

 * Returns:

 * Zero on success, negative error code on failure.

 */

int mipi_dbi_buf_copy(void *dst, struct drm_framebuffer *fb,

		      struct drm_clip_rect *clip, bool swap)

{

	struct drm_gem_cma_object *cma_obj = drm_fb_cma_get_gem_obj(fb, 0);
@@ -192,6 +202,7 @@ static int mipi_dbi_buf_copy(void *dst, struct drm_framebuffer *fb, 
					     DMA_FROM_DEVICE);

	return ret;

}

EXPORT_SYMBOL(mipi_dbi_buf_copy);



static int mipi_dbi_fb_dirty(struct drm_framebuffer *fb,

			     struct drm_file *file_priv,
@@ -444,18 +455,23 @@ EXPORT_SYMBOL(mipi_dbi_display_is_on); 


#if IS_ENABLED(CONFIG_SPI)



/*

/**

 * mipi_dbi_spi_cmd_max_speed - get the maximum SPI bus speed

 * @spi: SPI device

 * @len: The transfer buffer length.

 *

 * Many controllers have a max speed of 10MHz, but can be pushed way beyond

 * that. Increase reliability by running pixel data at max speed and the rest

 * at 10MHz, preventing transfer glitches from messing up the init settings.

 */

static u32 mipi_dbi_spi_cmd_max_speed(struct spi_device *spi, size_t len)

u32 mipi_dbi_spi_cmd_max_speed(struct spi_device *spi, size_t len)

{

	if (len > 64)

		return 0; /* use default */



	return min_t(u32, 10000000, spi->max_speed_hz);

}

EXPORT_SYMBOL(mipi_dbi_spi_cmd_max_speed);



/*

 * MIPI DBI Type C Option 1

include/drm/tinydrm/mipi-dbi.h

+3 −1
Original line number Diff line number Diff line
@@ -72,10 +72,12 @@ 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);

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);

int mipi_dbi_command_buf(struct mipi_dbi *mipi, u8 cmd, u8 *data, size_t len);



int mipi_dbi_buf_copy(void *dst, struct drm_framebuffer *fb,

		      struct drm_clip_rect *clip, bool swap);

/**

 * mipi_dbi_command - MIPI DCS command with optional parameter(s)

 * @mipi: MIPI structure