[v4,24/78] drm/vc4: hvs: Make sure our channel is reset
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Message ID 1fa32b771828098365162a24654c7bbab805500e.1594230107.git-series.maxime@cerno.tech
State New
Headers show
Series
  • drm/vc4: Support BCM2711 Display Pipeline
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Commit Message

Maxime Ripard July 8, 2020, 5:41 p.m. UTC
In order to clear our intermediate FIFOs that might end up with a stale
pixel, let's make sure our FIFO channel is reset everytime our channel is
setup.

Signed-off-by: Maxime Ripard <maxime@cerno.tech>
---
 drivers/gpu/drm/vc4/vc4_hvs.c | 4 ++++
 1 file changed, 4 insertions(+)

Comments

Dave Stevenson July 28, 2020, 10:37 a.m. UTC | #1
Hi Maxime

On Wed, 8 Jul 2020 at 18:43, Maxime Ripard <maxime@cerno.tech> wrote:
>
> In order to clear our intermediate FIFOs that might end up with a stale
> pixel, let's make sure our FIFO channel is reset everytime our channel is
> setup.

Minor nit pick: s/everytime/every time

> Signed-off-by: Maxime Ripard <maxime@cerno.tech>

Reviewed-by: Dave Stevenson <dave.stevenson@raspberrypi.com>

> ---
>  drivers/gpu/drm/vc4/vc4_hvs.c | 4 ++++
>  1 file changed, 4 insertions(+)
>
> diff --git a/drivers/gpu/drm/vc4/vc4_hvs.c b/drivers/gpu/drm/vc4/vc4_hvs.c
> index c7de77afbf0a..64b9d72471ef 100644
> --- a/drivers/gpu/drm/vc4/vc4_hvs.c
> +++ b/drivers/gpu/drm/vc4/vc4_hvs.c
> @@ -205,6 +205,10 @@ static int vc4_hvs_init_channel(struct vc4_dev *vc4, struct drm_crtc *crtc,
>         u32 dispbkgndx;
>         u32 dispctrl;
>
> +       HVS_WRITE(SCALER_DISPCTRLX(chan), 0);
> +       HVS_WRITE(SCALER_DISPCTRLX(chan), SCALER_DISPCTRLX_RESET);
> +       HVS_WRITE(SCALER_DISPCTRLX(chan), 0);
> +
>         /* Turn on the scaler, which will wait for vstart to start
>          * compositing.
>          * When feeding the transposer, we should operate in oneshot
> --
> git-series 0.9.1

Patch
diff mbox series

diff --git a/drivers/gpu/drm/vc4/vc4_hvs.c b/drivers/gpu/drm/vc4/vc4_hvs.c
index c7de77afbf0a..64b9d72471ef 100644
--- a/drivers/gpu/drm/vc4/vc4_hvs.c
+++ b/drivers/gpu/drm/vc4/vc4_hvs.c
@@ -205,6 +205,10 @@  static int vc4_hvs_init_channel(struct vc4_dev *vc4, struct drm_crtc *crtc,
 	u32 dispbkgndx;
 	u32 dispctrl;
 
+	HVS_WRITE(SCALER_DISPCTRLX(chan), 0);
+	HVS_WRITE(SCALER_DISPCTRLX(chan), SCALER_DISPCTRLX_RESET);
+	HVS_WRITE(SCALER_DISPCTRLX(chan), 0);
+
 	/* Turn on the scaler, which will wait for vstart to start
 	 * compositing.
 	 * When feeding the transposer, we should operate in oneshot