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drm/mipi_dbi: Add support for display offsets

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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: Geert Uytterhoeven <geert+renesas@glider.be>
Reviewed-by: Sam Ravnborg <sam@ravnborg.org>
Acked-by: Noralf Trønnes <noralf@tronnes.org>
Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20200115124548.3951-4-geert+renesas@glider.be
This commit is contained in:
Geert Uytterhoeven 2020-01-15 13:45:46 +01:00 committed by Sam Ravnborg
parent 3a1a6be40b
commit f41a8a6989
2 changed files with 32 additions and 10 deletions
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30
drivers/gpu/drm/drm_mipi_dbi.c
View file

@ -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);

12
include/drm/drm_mipi_dbi.h
View file

@ -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)
*/