From 03ceb1c8dfd1e293f40696bfe4e61c78820a0867 Mon Sep 17 00:00:00 2001 From: Eric Anholt Date: Wed, 24 Oct 2018 11:43:13 -0700 Subject: drm/tinydrm: Fix setting of the column/page end addresses. MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit If the clipped dirty region's x/y happened to align to 256, we would have set the top 8 bits wrong. Noticed by inspection, not by reproducing a bug. Signed-off-by: Eric Anholt Link: https://patchwork.freedesktop.org/patch/msgid/20181024184313.2967-4-eric@anholt.net Reviewed-by: Noralf Trønnes --- drivers/gpu/drm/tinydrm/mipi-dbi.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) (limited to 'drivers') diff --git a/drivers/gpu/drm/tinydrm/mipi-dbi.c b/drivers/gpu/drm/tinydrm/mipi-dbi.c index cb3441e51d5f..1bb870021f6e 100644 --- a/drivers/gpu/drm/tinydrm/mipi-dbi.c +++ b/drivers/gpu/drm/tinydrm/mipi-dbi.c @@ -240,10 +240,10 @@ static int mipi_dbi_fb_dirty(struct drm_framebuffer *fb, mipi_dbi_command(mipi, MIPI_DCS_SET_COLUMN_ADDRESS, (clip.x1 >> 8) & 0xFF, clip.x1 & 0xFF, - (clip.x2 >> 8) & 0xFF, (clip.x2 - 1) & 0xFF); + ((clip.x2 - 1) >> 8) & 0xFF, (clip.x2 - 1) & 0xFF); mipi_dbi_command(mipi, MIPI_DCS_SET_PAGE_ADDRESS, (clip.y1 >> 8) & 0xFF, clip.y1 & 0xFF, - (clip.y2 >> 8) & 0xFF, (clip.y2 - 1) & 0xFF); + ((clip.y2 - 1) >> 8) & 0xFF, (clip.y2 - 1) & 0xFF); ret = mipi_dbi_command_buf(mipi, MIPI_DCS_WRITE_MEMORY_START, tr, (clip.x2 - clip.x1) * (clip.y2 - clip.y1) * 2); -- cgit v1.2.3