Re: [PATCH v2 1/3] drm: rcar-du: Use the VBK interrupt for vblank events

[Kieran Bingham <kieran.bingham+renesas@ideasonboard.com>]

Hi Laurent,

On 11/07/17 23:29, Laurent Pinchart wrote:
> When implementing support for interlaced modes, the driver switched from
> reporting vblank events on the vertical blanking (VBK) interrupt to the
> frame end interrupt (FRM). This incorrectly divided the reported refresh
> rate by two. Fix it by moving back to the VBK interrupt.
> 
> Fixes: 906eff7fcada ("drm: rcar-du: Implement support for interlaced modes")
> Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>

Of course, this looks much more correct than the patch I submitted :-)

Reviewed-by: Kieran Bingham <kieran.bingham+renesas@ideasonboard.com>

> ---
>  drivers/gpu/drm/rcar-du/rcar_du_crtc.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/gpu/drm/rcar-du/rcar_du_crtc.c b/drivers/gpu/drm/rcar-du/rcar_du_crtc.c
> index 98cf446391dc..17fd1cd5212c 100644
> --- a/drivers/gpu/drm/rcar-du/rcar_du_crtc.c
> +++ b/drivers/gpu/drm/rcar-du/rcar_du_crtc.c
> @@ -698,7 +698,7 @@ static irqreturn_t rcar_du_crtc_irq(int irq, void *arg)
>  	status = rcar_du_crtc_read(rcrtc, DSSR);
>  	rcar_du_crtc_write(rcrtc, DSRCR, status & DSRCR_MASK);
>  
> -	if (status & DSSR_FRM) {
> +	if (status & DSSR_VBK) {
>  		drm_crtc_handle_vblank(&rcrtc->crtc);
>  
>  		if (rcdu->info->gen < 3)
>