Commit f41a8a69 authored by Geert Uytterhoeven's avatar Geert Uytterhoeven Committed by Sam Ravnborg
Browse files

drm/mipi_dbi: Add support for display offsets 



If the resolution of the TFT display is smaller than the maximum
resolution supported by the display controller, the display may be
connected to the driver output arrays with a horizontal and/or vertical
offset, leading to a shifted image.

Add support for specifying these offsets.

Signed-off-by: default avatarGeert Uytterhoeven <geert+renesas@glider.be>
Reviewed-by: default avatarSam Ravnborg <sam@ravnborg.org>
Acked-by: default avatarNoralf Trønnes <noralf@tronnes.org>
Signed-off-by: default avatarSam Ravnborg <sam@ravnborg.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20200115124548.3951-4-geert+renesas@glider.be
parent 3a1a6be4

drivers/gpu/drm/drm_mipi_dbi.c

+20 −10
Original line number Diff line number Diff line
@@ -238,6 +238,23 @@ int mipi_dbi_buf_copy(void *dst, struct drm_framebuffer *fb, 
}

EXPORT_SYMBOL(mipi_dbi_buf_copy);



static void mipi_dbi_set_window_address(struct mipi_dbi_dev *dbidev,

					unsigned int xs, unsigned int xe,

					unsigned int ys, unsigned int ye)

{

	struct mipi_dbi *dbi = &dbidev->dbi;



	xs += dbidev->left_offset;

	xe += dbidev->left_offset;

	ys += dbidev->top_offset;

	ye += dbidev->top_offset;



	mipi_dbi_command(dbi, MIPI_DCS_SET_COLUMN_ADDRESS, (xs >> 8) & 0xff,

			 xs & 0xff, (xe >> 8) & 0xff, xe & 0xff);

	mipi_dbi_command(dbi, MIPI_DCS_SET_PAGE_ADDRESS, (ys >> 8) & 0xff,

			 ys & 0xff, (ye >> 8) & 0xff, ye & 0xff);

}



static void mipi_dbi_fb_dirty(struct drm_framebuffer *fb, struct drm_rect *rect)

{

	struct drm_gem_object *gem = drm_gem_fb_get_obj(fb, 0);
@@ -271,12 +288,8 @@ static void mipi_dbi_fb_dirty(struct drm_framebuffer *fb, struct drm_rect *rect) 
		tr = cma_obj->vaddr;

	}



	mipi_dbi_command(dbi, MIPI_DCS_SET_COLUMN_ADDRESS,

			 (rect->x1 >> 8) & 0xff, rect->x1 & 0xff,

			 ((rect->x2 - 1) >> 8) & 0xff, (rect->x2 - 1) & 0xff);

	mipi_dbi_command(dbi, MIPI_DCS_SET_PAGE_ADDRESS,

			 (rect->y1 >> 8) & 0xff, rect->y1 & 0xff,

			 ((rect->y2 - 1) >> 8) & 0xff, (rect->y2 - 1) & 0xff);

	mipi_dbi_set_window_address(dbidev, rect->x1, rect->x2 - 1, rect->y1,

				    rect->y2 - 1);



	ret = mipi_dbi_command_buf(dbi, MIPI_DCS_WRITE_MEMORY_START, tr,

				   width * height * 2);
@@ -366,10 +379,7 @@ static void mipi_dbi_blank(struct mipi_dbi_dev *dbidev) 


	memset(dbidev->tx_buf, 0, len);



	mipi_dbi_command(dbi, MIPI_DCS_SET_COLUMN_ADDRESS, 0, 0,

			 ((width - 1) >> 8) & 0xFF, (width - 1) & 0xFF);

	mipi_dbi_command(dbi, MIPI_DCS_SET_PAGE_ADDRESS, 0, 0,

			 ((height - 1) >> 8) & 0xFF, (height - 1) & 0xFF);

	mipi_dbi_set_window_address(dbidev, 0, width - 1, 0, height - 1);

	mipi_dbi_command_buf(dbi, MIPI_DCS_WRITE_MEMORY_START,

			     (u8 *)dbidev->tx_buf, len);

include/drm/drm_mipi_dbi.h

+12 −0
Original line number Diff line number Diff line
@@ -109,6 +109,18 @@ struct mipi_dbi_dev { 
	 */

	unsigned int rotation;



	/**

	 * @left_offset: Horizontal offset of the display relative to the

	 *               controller's driver array

	 */

	unsigned int left_offset;



	/**

	 * @top_offset: Vertical offset of the display relative to the

	 *              controller's driver array

	 */

	unsigned int top_offset;



	/**

	 * @backlight: backlight device (optional)

	 */

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