From 07ea136219e0bbb653bb15247f1c1838d635f3bb Mon Sep 17 00:00:00 2001 From: Mikulas Patocka Date: Mon, 8 Oct 2018 12:57:34 +0200 Subject: [PATCH] mach64: fix display corruption on big endian machines MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit commit 3c6c6a7878d00a3ac997a779c5b9861ff25dfcc8 upstream. The code for manual bit triple is not endian-clean. It builds the variable "hostdword" using byte accesses, therefore we must read the variable with "le32_to_cpu". The patch also enables (hardware or software) bit triple only if the image is monochrome (image->depth). If we want to blit full-color image, we shouldn't use the triple code. Signed-off-by: Mikulas Patocka Reviewed-by: Ville Syrjälä Cc: stable@vger.kernel.org Signed-off-by: Bartlomiej Zolnierkiewicz Signed-off-by: Greg Kroah-Hartman --- drivers/video/fbdev/aty/mach64_accel.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) diff --git a/drivers/video/fbdev/aty/mach64_accel.c b/drivers/video/fbdev/aty/mach64_accel.c index 2541a0e0de76..7c53a2380cc8 100644 --- a/drivers/video/fbdev/aty/mach64_accel.c +++ b/drivers/video/fbdev/aty/mach64_accel.c @@ -345,7 +345,7 @@ void atyfb_imageblit(struct fb_info *info, const struct fb_image *image) * since Rage 3D IIc we have DP_HOST_TRIPLE_EN bit * this hwaccelerated triple has an issue with not aligned data */ - if (M64_HAS(HW_TRIPLE) && image->width % 8 == 0) + if (image->depth == 1 && M64_HAS(HW_TRIPLE) && image->width % 8 == 0) pix_width |= DP_HOST_TRIPLE_EN; } @@ -382,7 +382,7 @@ void atyfb_imageblit(struct fb_info *info, const struct fb_image *image) src_bytes = (((image->width * image->depth) + 7) / 8) * image->height; /* manual triple each pixel */ - if (info->var.bits_per_pixel == 24 && !(pix_width & DP_HOST_TRIPLE_EN)) { + if (image->depth == 1 && info->var.bits_per_pixel == 24 && !(pix_width & DP_HOST_TRIPLE_EN)) { int inbit, outbit, mult24, byte_id_in_dword, width; u8 *pbitmapin = (u8*)image->data, *pbitmapout; u32 hostdword; @@ -415,7 +415,7 @@ void atyfb_imageblit(struct fb_info *info, const struct fb_image *image) } } wait_for_fifo(1, par); - aty_st_le32(HOST_DATA0, hostdword, par); + aty_st_le32(HOST_DATA0, le32_to_cpu(hostdword), par); } } else { u32 *pbitmap, dwords = (src_bytes + 3) / 4; -- 2.20.1