[PATCH 4.19 088/205] mach64: fix display corruption on big endian machines
From: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Date: 2018-11-19 16:34:00
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4.19-stable review patch. If anyone has any objections, please let me know. ------------------ From: Mikulas Patocka <mpatocka@redhat.com> 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 <mpatocka@redhat.com> Reviewed-by: Ville Syrjälä <syrjala@sci.fi> Cc: stable@vger.kernel.org Signed-off-by: Bartlomiej Zolnierkiewicz <redacted> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> --- drivers/video/fbdev/aty/mach64_accel.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-)
--- 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 *inf * 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 *inf 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 *inf } } 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;