On Wed, Jun 26, 2019 at 08:55:51AM +0200, Gerd Hoffmann wrote:
> If bo->width doesn't match fb->width the driver fails to configure
> the display correctly, resulting in a scrambled display. Fix it.
>
> Signed-off-by: Gerd Hoffmann <kraxel@xxxxxxxxxx>
> ---
> drivers/gpu/drm/bochs/bochs.h | 2 +-
> drivers/gpu/drm/bochs/bochs_hw.c | 13 +++++++++----
> drivers/gpu/drm/bochs/bochs_kms.c | 1 +
> 3 files changed, 11 insertions(+), 5 deletions(-)
>
> diff --git a/drivers/gpu/drm/bochs/bochs.h b/drivers/gpu/drm/bochs/bochs.h
> index cc35d492142c..78c0283496cc 100644
> --- a/drivers/gpu/drm/bochs/bochs.h
> +++ b/drivers/gpu/drm/bochs/bochs.h
> @@ -86,7 +86,7 @@ void bochs_hw_setmode(struct bochs_device *bochs,
> void bochs_hw_setformat(struct bochs_device *bochs,
> const struct drm_format_info *format);
> void bochs_hw_setbase(struct bochs_device *bochs,
> - int x, int y, u64 addr);
> + int x, int y, int fbwidth, u64 addr);
> int bochs_hw_load_edid(struct bochs_device *bochs);
>
> /* bochs_mm.c */
> diff --git a/drivers/gpu/drm/bochs/bochs_hw.c b/drivers/gpu/drm/bochs/bochs_hw.c
> index 791ab2f79947..141aa02962d3 100644
> --- a/drivers/gpu/drm/bochs/bochs_hw.c
> +++ b/drivers/gpu/drm/bochs/bochs_hw.c
> @@ -255,16 +255,21 @@ void bochs_hw_setformat(struct bochs_device *bochs,
> }
>
> void bochs_hw_setbase(struct bochs_device *bochs,
> - int x, int y, u64 addr)
> + int x, int y, int fbwidth, u64 addr)
> {
> - unsigned long offset = (unsigned long)addr +
> + unsigned long offset;
> + unsigned int vx, vy;
> +
> + bochs->stride = fbwidth * (bochs->bpp / 8);
> + offset = (unsigned long)addr +
> y * bochs->stride +
> x * (bochs->bpp / 8);
> - int vy = offset / bochs->stride;
> - int vx = (offset % bochs->stride) * 8 / bochs->bpp;
> + vy = offset / bochs->stride;
> + vx = (offset % bochs->stride) * 8 / bochs->bpp;
>
> DRM_DEBUG_DRIVER("x %d, y %d, addr %llx -> offset %lx, vx %d, vy %d\n",
> x, y, addr, offset, vx, vy);
> + bochs_dispi_write(bochs, VBE_DISPI_INDEX_VIRT_WIDTH, fbwidth);
> bochs_dispi_write(bochs, VBE_DISPI_INDEX_X_OFFSET, vx);
> bochs_dispi_write(bochs, VBE_DISPI_INDEX_Y_OFFSET, vy);
> }
> diff --git a/drivers/gpu/drm/bochs/bochs_kms.c b/drivers/gpu/drm/bochs/bochs_kms.c
> index 5904eddc83a5..1f6aa11a1dc9 100644
> --- a/drivers/gpu/drm/bochs/bochs_kms.c
> +++ b/drivers/gpu/drm/bochs/bochs_kms.c
> @@ -36,6 +36,7 @@ static void bochs_plane_update(struct bochs_device *bochs,
> bochs_hw_setbase(bochs,
> state->crtc_x,
> state->crtc_y,
> + gbo->width,
You want the dimensions of the drm_framebuffer here, not something from
the underlying gem bo.
> gbo->bo.offset);
I think same here, or at least additionally take into account both
drm_framebuffer offset _and_ vram offset.
-Daniel
> bochs_hw_setformat(bochs, state->fb->format);
> }
> --
> 2.18.1
>
--
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch
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