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drm/vc4: hvs: Correct logic on stopping an HVS channel

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When factoring out __vc4_hvs_stop_channel, the logic got inverted from
	if (condition)
	  // stop channel
to
	if (condition)
	  goto out
	//stop channel
	out:
and also changed the exact register writes used to stop the channel.

Correct the logic so that the channel is actually stopped, and revert
to the original register writes.

Fixes: 6d01a106b4 ("drm/vc4: crtc: Move HVS init and close to a function")
Reviewed-by: Maxime Ripard <mripard@kernel.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20240621152055.4180873-32-dave.stevenson@raspberrypi.com
Signed-off-by: Dave Stevenson <dave.stevenson@raspberrypi.com>
This commit is contained in:
Dave Stevenson 2024-06-21 16:20:55 +01:00
parent 886a79237e
commit 7ab6512e79
1 changed files with 3 additions and 5 deletions
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8
drivers/gpu/drm/vc4/vc4_hvs.c
View File

@ -427,13 +427,11 @@ void vc4_hvs_stop_channel(struct vc4_hvs *hvs, unsigned int chan)
if (!drm_dev_enter(drm, &idx))
return;
if (HVS_READ(SCALER_DISPCTRLX(chan)) & SCALER_DISPCTRLX_ENABLE)
if (!(HVS_READ(SCALER_DISPCTRLX(chan)) & SCALER_DISPCTRLX_ENABLE))
goto out;
HVS_WRITE(SCALER_DISPCTRLX(chan),
HVS_READ(SCALER_DISPCTRLX(chan)) | SCALER_DISPCTRLX_RESET);
HVS_WRITE(SCALER_DISPCTRLX(chan),
HVS_READ(SCALER_DISPCTRLX(chan)) & ~SCALER_DISPCTRLX_ENABLE);
HVS_WRITE(SCALER_DISPCTRLX(chan), SCALER_DISPCTRLX_RESET);
HVS_WRITE(SCALER_DISPCTRLX(chan), 0);
/* Once we leave, the scaler should be disabled and its fifo empty. */
WARN_ON_ONCE(HVS_READ(SCALER_DISPCTRLX(chan)) & SCALER_DISPCTRLX_RESET);