On Fri, 17 Aug 2018, Mikulas Patocka wrote:
> There's console font corruption when using the mach64 driver in 24bpp
> mode.
>
> In 24bpp mode, the mach64 accelerator is set up for 8-bpp mode (with
> horizontal width and stride multiplied by 3). In this mode, the
> accelerator can't even possibly support color expansion. Consquently, we
> have to use an unaccelerated function cfb_imageblit for color expansion.
>
> Signed-off-by: Mikulas Patocka <mpatocka@xxxxxxxxxx>
> Cc: stable@xxxxxxxxxxxxxxx
Self-nack for this patch.
I've sent further patches that fix the display corruption without
disabling the accelerator.
Mikulas
> ---
> drivers/video/fbdev/aty/mach64_accel.c | 3 ++-
> 1 file changed, 2 insertions(+), 1 deletion(-)
>
> Index: linux-stable/drivers/video/fbdev/aty/mach64_accel.c
> ===================================================================
> --- linux-stable.orig/drivers/video/fbdev/aty/mach64_accel.c 2018-04-20 18:11:01.000000000 +0200
> +++ linux-stable/drivers/video/fbdev/aty/mach64_accel.c 2018-08-13 17:37:04.000000000 +0200
> @@ -291,7 +291,8 @@ void atyfb_imageblit(struct fb_info *inf
> if (!image->width || !image->height)
> return;
> if (!par->accel_flags ||
> - (image->depth != 1 && info->var.bits_per_pixel != image->depth)) {
> + (image->depth != 1 && info->var.bits_per_pixel != image->depth) ||
> + (image->depth == 1 && info->var.bits_per_pixel == 24)) {
> cfb_imageblit(info, image);
> return;
> }
>
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