Re: [PATCH] drm/pl111: Fix offset calculation for the primary plane.

[Sean Paul]

On Fri, Jun 02, 2017 at 06:57:33PM -0700, Eric Anholt wrote:
> If src_x/y were nonzero, we failed to shift them down by 16 to get the
> pixel offset.  The recent CMA helper function gets it right.
> 
> Signed-off-by: Eric Anholt <eric@xxxxxxxxxx>
> Fixes: bed41005e617 ("drm/pl111: Initial drm/kms driver for pl111")
> Reported-by: Mircea Carausu <mircea.carausu@xxxxxxxxxxxx>


Reviewed-by: Sean Paul <seanpaul@xxxxxxxxxxxx>

> ---
>  drivers/gpu/drm/pl111/pl111_display.c | 15 ++-------------
>  1 file changed, 2 insertions(+), 13 deletions(-)
> 
> diff --git a/drivers/gpu/drm/pl111/pl111_display.c b/drivers/gpu/drm/pl111/pl111_display.c
> index 3e0a4fa73ddb..c6ca4f1bbd49 100644
> --- a/drivers/gpu/drm/pl111/pl111_display.c
> +++ b/drivers/gpu/drm/pl111/pl111_display.c
> @@ -50,17 +50,6 @@ irqreturn_t pl111_irq(int irq, void *data)
>  	return status;
>  }
>  
> -static u32 pl111_get_fb_offset(struct drm_plane_state *pstate)
> -{
> -	struct drm_framebuffer *fb = pstate->fb;
> -	struct drm_gem_cma_object *obj = drm_fb_cma_get_gem_obj(fb, 0);
> -
> -	return (obj->paddr +
> -		fb->offsets[0] +
> -		fb->format->cpp[0] * pstate->src_x +
> -		fb->pitches[0] * pstate->src_y);
> -}
> -
>  static int pl111_display_check(struct drm_simple_display_pipe *pipe,
>  			       struct drm_plane_state *pstate,
>  			       struct drm_crtc_state *cstate)
> @@ -73,7 +62,7 @@ static int pl111_display_check(struct drm_simple_display_pipe *pipe,
>  		return -EINVAL;
>  
>  	if (fb) {
> -		u32 offset = pl111_get_fb_offset(pstate);
> +		u32 offset = drm_fb_cma_get_gem_addr(fb, pstate, 0);
>  
>  		/* FB base address must be dword aligned. */
>  		if (offset & 3)
> @@ -249,7 +238,7 @@ static void pl111_display_update(struct drm_simple_display_pipe *pipe,
>  	struct drm_framebuffer *fb = pstate->fb;
>  
>  	if (fb) {
> -		u32 addr = pl111_get_fb_offset(pstate);
> +		u32 addr = drm_fb_cma_get_gem_addr(fb, pstate, 0);
>  
>  		writel(addr, priv->regs + CLCD_UBAS);
>  	}
> -- 
> 2.11.0
> 
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-- 
Sean Paul, Software Engineer, Google / Chromium OS