Re: [PATCH v4 5/8] drm/vc4: hdmi: Store pixel frequency in the connector state

From: Maxime Ripard <maxime@cerno.tech>
To: Thomas Zimmermann <tzimmermann@suse.de>
Cc: Dave Stevenson <dave.stevenson@raspberrypi.com>,
	David Airlie <airlied@linux.ie>,
	Maarten Lankhorst <maarten.lankhorst@linux.intel.com>,
	dri-devel@lists.freedesktop.org, Eric Anholt <eric@anholt.net>,
	bcm-kernel-feedback-list@broadcom.com,
	linux-rpi-kernel@lists.infradead.org,
	Daniel Vetter <daniel.vetter@intel.com>,
	linux-arm-kernel@lists.infradead.org
Subject: Re: [PATCH v4 5/8] drm/vc4: hdmi: Store pixel frequency in the connector state
Date: Mon, 7 Dec 2020 16:44:27 +0100	[thread overview]
Message-ID: <20201207154427.uvhhnwrtmwagas33@gilmour> (raw)
In-Reply-To: <201be890-781d-0c94-7f42-df761e4facac@suse.de>

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Hi Thomas,

On Mon, Dec 07, 2020 at 03:14:49PM +0100, Thomas Zimmermann wrote:
> Am 07.12.20 um 14:39 schrieb Maxime Ripard:
> > The pixel rate is for now quite simple to compute, but with more features
> > (30 and 36 bits output, YUV output, etc.) will depend on a bunch of
> > connectors properties.
> > 
> > Let's store the rate we have to run the pixel clock at in our custom
> > connector state, and compute it in atomic_check.
> > 
> > Signed-off-by: Maxime Ripard <maxime@cerno.tech>
> > ---
> >   drivers/gpu/drm/vc4/vc4_hdmi.c | 26 +++++++++++++++++++++++++-
> >   drivers/gpu/drm/vc4/vc4_hdmi.h |  1 +
> >   2 files changed, 26 insertions(+), 1 deletion(-)
> > 
> > diff --git a/drivers/gpu/drm/vc4/vc4_hdmi.c b/drivers/gpu/drm/vc4/vc4_hdmi.c
> > index 862c93708e9a..c1667cfe37db 100644
> > --- a/drivers/gpu/drm/vc4/vc4_hdmi.c
> > +++ b/drivers/gpu/drm/vc4/vc4_hdmi.c
> > @@ -194,6 +194,7 @@ vc4_hdmi_connector_duplicate_state(struct drm_connector *connector)
> >   	if (!new_state)
> >   		return NULL;
> > +	new_state->pixel_rate = vc4_state->pixel_rate;
> >   	__drm_atomic_helper_connector_duplicate_state(connector, &new_state->base);
> >   	return &new_state->base;
> > @@ -611,9 +612,29 @@ static void vc4_hdmi_recenter_fifo(struct vc4_hdmi *vc4_hdmi)
> >   		  "VC4_HDMI_FIFO_CTL_RECENTER_DONE");
> >   }
> > +static struct drm_connector_state *
> > +vc4_hdmi_encoder_get_connector_state(struct drm_encoder *encoder,
> > +				     struct drm_atomic_state *state)
> > +{
> > +	struct drm_connector_state *conn_state;
> > +	struct drm_connector *connector;
> > +	unsigned int i;
> > +
> > +	for_each_new_connector_in_state(state, connector, conn_state, i) {
> > +		if (conn_state->best_encoder == encoder)
> > +			return conn_state;
> > +	}
> > +
> > +	return NULL;
> > +}
> > +
> >   static void vc4_hdmi_encoder_pre_crtc_configure(struct drm_encoder *encoder,
> >   						struct drm_atomic_state *state)
> >   {
> > +	struct drm_connector_state *conn_state =
> > +		vc4_hdmi_encoder_get_connector_state(encoder, state);
> > +	struct vc4_hdmi_connector_state *vc4_conn_state =
> > +		conn_state_to_vc4_hdmi_conn_state(conn_state);
> >   	struct drm_display_mode *mode = &encoder->crtc->state->adjusted_mode;
> >   	struct vc4_hdmi *vc4_hdmi = encoder_to_vc4_hdmi(encoder);
> >   	unsigned long pixel_rate, hsm_rate;
> > @@ -625,7 +646,7 @@ static void vc4_hdmi_encoder_pre_crtc_configure(struct drm_encoder *encoder,
> >   		return;
> >   	}
> > -	pixel_rate = mode->clock * 1000 * ((mode->flags & DRM_MODE_FLAG_DBLCLK) ? 2 : 1);
> 
> Has (mode->flags & DRM_MODE_FLAG_DBLCLK) been lost? I cannot find it any
> longer. The code in atomic_check() looks significantly different.

Indeed, it's a mistake from a previous patch. I'll send a fix for that one too.

Thanks!
Maxime

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