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drm/mipi-dbi: Fix blanking for non-16 bit formats

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[ 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: 4aebb79021 ("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>
This commit is contained in:
Russell Cloran
2025-04-14 22:32:59 -07:00
committed by Greg Kroah-Hartman
parent d0d7c93b4b
commit 7fc2c784dd
1 changed files with 5 additions and 1 deletions
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6
drivers/gpu/drm/drm_mipi_dbi.c
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@@ -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);