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drm/ssd130x: Fix screen clearing 

[ Upstream commit 4dbce3d6fea59e1df1d1a35aacea0c186f72107a ]

Due to the reuse of buffers, ssd130x_clear_screen() no longers clears
the screen, but merely redraws the last image that is residing in the
intermediate buffer.

As there is no point in clearing the intermediate buffer and transposing
an all-black image, fix this by just clearing the HW format buffer, and
writing it to the panel.

Fixes: 49d7d581ce ("drm/ssd130x: Don't allocate buffers on each plane update")
Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
Reviewed-by: Javier Martinez Canillas <javierm@redhat.com>
Tested-by: Javier Martinez Canillas <javierm@redhat.com>
Signed-off-by: Javier Martinez Canillas <javierm@redhat.com>
Link: https://patchwork.freedesktop.org/patch/msgid/c19cd5a57205597bb38a446c3871092993498f01.1692888745.git.geert@linux-m68k.org
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Geert Uytterhoeven 2023-08-24 17:08:40 +02:00 committed by Greg Kroah-Hartman
parent 1ea9c12b66
commit 7684d956d7
1 changed files with 38 additions and 7 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

45
drivers/gpu/drm/solomon/ssd130x.c
View File

@ -553,14 +553,45 @@ static int ssd130x_update_rect(struct ssd130x_device *ssd130x,
static void ssd130x_clear_screen(struct ssd130x_device *ssd130x,
struct ssd130x_plane_state *ssd130x_state)
{
struct drm_rect fullscreen = {
.x1 = 0,
.x2 = ssd130x->width,
.y1 = 0,
.y2 = ssd130x->height,
};
unsigned int page_height = ssd130x->device_info->page_height;
unsigned int pages = DIV_ROUND_UP(ssd130x->height, page_height);
u8 *data_array = ssd130x_state->data_array;
unsigned int width = ssd130x->width;
int ret, i;
ssd130x_update_rect(ssd130x, ssd130x_state, &fullscreen);
if (!ssd130x->page_address_mode) {
memset(data_array, 0, width * pages);
/* Set address range for horizontal addressing mode */
ret = ssd130x_set_col_range(ssd130x, ssd130x->col_offset, width);
if (ret < 0)
return;
ret = ssd130x_set_page_range(ssd130x, ssd130x->page_offset, pages);
if (ret < 0)
return;
/* Write out update in one go if we aren't using page addressing mode */
ssd130x_write_data(ssd130x, data_array, width * pages);
} else {
/*
* In page addressing mode, the start address needs to be reset,
* and each page then needs to be written out separately.
*/
memset(data_array, 0, width);
for (i = 0; i < pages; i++) {
ret = ssd130x_set_page_pos(ssd130x,
ssd130x->page_offset + i,
ssd130x->col_offset);
if (ret < 0)
return;
ret = ssd130x_write_data(ssd130x, data_array, width);
if (ret < 0)
return;
}
}
}
static int ssd130x_fb_blit_rect(struct drm_plane_state *state,