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@xxxxxxxxx>
---
drivers/gpu/drm/drm_mipi_dbi.c | 30 ++++++++++++++++++++----------
include/drm/drm_mipi_dbi.h | 12 ++++++++++++
2 files changed, 32 insertions(+), 10 deletions(-)
diff --git a/drivers/gpu/drm/drm_mipi_dbi.c b/drivers/gpu/drm/drm_mipi_dbi.c
index 16bff1be4b8ac622..27fe81a53c88e338 100644
--- a/drivers/gpu/drm/drm_mipi_dbi.c
+++ b/drivers/gpu/drm/drm_mipi_dbi.c
@@ -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);
diff --git a/include/drm/drm_mipi_dbi.h b/include/drm/drm_mipi_dbi.h
index 67c66f5ee591e80f..33f325f5af2b921f 100644
--- a/include/drm/drm_mipi_dbi.h
+++ b/include/drm/drm_mipi_dbi.h
@@ -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)
*/
--
2.17.1
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