[PATCH 5/6] drm/vc4: kms: Warn if we have an incompatible muxing setup
Thomas Zimmermann
tzimmermann at suse.de
Wed Apr 6 09:07:53 UTC 2022
Am 28.03.22 um 17:36 schrieb Maxime Ripard:
> The documentation explicitly states we must prevent the output
> 2 and 3 from feeding from the same HVS channel.
>
> Let's add a warning to make some noise if we ever find ourselves in such
> a case.
>
> Signed-off-by: Maxime Ripard <maxime at cerno.tech>
> ---
> drivers/gpu/drm/vc4/vc4_kms.c | 3 +++
> 1 file changed, 3 insertions(+)
>
> diff --git a/drivers/gpu/drm/vc4/vc4_kms.c b/drivers/gpu/drm/vc4/vc4_kms.c
> index 94c58ec37a27..d94f78eac936 100644
> --- a/drivers/gpu/drm/vc4/vc4_kms.c
> +++ b/drivers/gpu/drm/vc4/vc4_kms.c
> @@ -286,6 +286,9 @@ static void vc5_hvs_pv_muxing_commit(struct vc4_dev *vc4,
>
> switch (vc4_crtc->data->hvs_output) {
> case 2:
> + WARN_ON(VC4_GET_FIELD(HVS_READ(SCALER_DISPCTRL),
> + SCALER_DISPCTRL_DSP3_MUX) == channel);
> +
Should be drm_WARN_ON().
Is that something that could be detected during atomic-check steps?
Best regards
Thomas
> mux = (channel == 2) ? 0 : 1;
> reg = HVS_READ(SCALER_DISPECTRL);
> HVS_WRITE(SCALER_DISPECTRL,
--
Thomas Zimmermann
Graphics Driver Developer
SUSE Software Solutions Germany GmbH
Maxfeldstr. 5, 90409 Nürnberg, Germany
(HRB 36809, AG Nürnberg)
Geschäftsführer: Ivo Totev
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