6.12-stable review patch. If anyone has any objections, please let me know.
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From: Russell Cloran rcloran@gmail.com
[ Upstream commit 1a8bc0fe8039e1e57f68c4a588f0403d98bfeb1f ]
On r6x2b6x2g6x2 displays not enough blank data is sent to blank the entire screen. When support for these displays was added, the dirty function was updated to handle the different amount of data, but blanking was not, and remained hardcoded as 2 bytes per pixel.
This change applies almost the same algorithm used in the dirty function to the blank function, but there is no fb available at that point, and no concern about having to transform any data, so the dbidev pixel format is always used for calculating the length.
Fixes: 4aebb79021f3 ("drm/mipi-dbi: Add support for DRM_FORMAT_RGB888") Signed-off-by: Russell Cloran rcloran@gmail.com Link: https://lore.kernel.org/r/20250415053259.79572-1-rcloran@gmail.com Signed-off-by: Maxime Ripard mripard@kernel.org Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/gpu/drm/drm_mipi_dbi.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/drm_mipi_dbi.c b/drivers/gpu/drm/drm_mipi_dbi.c index 34bca75675766..3ea9f23b4f67a 100644 --- a/drivers/gpu/drm/drm_mipi_dbi.c +++ b/drivers/gpu/drm/drm_mipi_dbi.c @@ -404,12 +404,16 @@ static void mipi_dbi_blank(struct mipi_dbi_dev *dbidev) u16 height = drm->mode_config.min_height; u16 width = drm->mode_config.min_width; struct mipi_dbi *dbi = &dbidev->dbi; - size_t len = width * height * 2; + const struct drm_format_info *dst_format; + size_t len; int idx;
if (!drm_dev_enter(drm, &idx)) return;
+ dst_format = drm_format_info(dbidev->pixel_format); + len = drm_format_info_min_pitch(dst_format, 0, width) * height; + memset(dbidev->tx_buf, 0, len);
mipi_dbi_set_window_address(dbidev, 0, width - 1, 0, height - 1);