Re: [PATCH v3 2/4] drm/i915: Add reverse mapping between port and intel_encoder

[Takashi Iwai <tiwai@suse.de>]

On Mon, 07 Dec 2015 09:44:45 +0100,
Daniel Vetter wrote:
> 
> On Fri, Dec 04, 2015 at 06:12:47PM +0100, Takashi Iwai wrote:
> > This patch adds a reverse mapping from a digital port number to
> > intel_encoder object containing the corresponding intel_digital_port.
> > It simplifies the query of the encoder a lot.
> > 
> > Signed-off-by: Takashi Iwai <tiwai@suse.de>
> > ---
> > v2->v3:
> > * Squashed previously two cleanup patches to a single patch
> > 
> >  drivers/gpu/drm/i915/i915_drv.h    |  2 ++
> >  drivers/gpu/drm/i915/intel_audio.c | 39 +++++++++++---------------------------
> >  drivers/gpu/drm/i915/intel_ddi.c   |  1 +
> >  drivers/gpu/drm/i915/intel_dp.c    |  1 +
> >  drivers/gpu/drm/i915/intel_hdmi.c  |  2 ++
> >  5 files changed, 17 insertions(+), 28 deletions(-)
> > 
> > diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
> > index 15c6dc0b4f37..9dbc143cac27 100644
> > --- a/drivers/gpu/drm/i915/i915_drv.h
> > +++ b/drivers/gpu/drm/i915/i915_drv.h
> > @@ -1944,6 +1944,8 @@ struct drm_i915_private {
> >  	/* perform PHY state sanity checks? */
> >  	bool chv_phy_assert[2];
> >  
> > +	struct intel_encoder *dig_port_map[I915_MAX_PORTS];
> > +
> >  	/*
> >  	 * NOTE: This is the dri1/ums dungeon, don't add stuff here. Your patch
> >  	 * will be rejected. Instead look for a better place.
> > diff --git a/drivers/gpu/drm/i915/intel_audio.c b/drivers/gpu/drm/i915/intel_audio.c
> > index eeac9f763110..05f08b445dd6 100644
> > --- a/drivers/gpu/drm/i915/intel_audio.c
> > +++ b/drivers/gpu/drm/i915/intel_audio.c
> > @@ -636,13 +636,11 @@ static int i915_audio_component_sync_audio_rate(struct device *dev,
> >  						int port, int rate)
> >  {
> >  	struct drm_i915_private *dev_priv = dev_to_i915(dev);
> > -	struct drm_device *drm_dev = dev_priv->dev;
> >  	struct intel_encoder *intel_encoder;
> > -	struct intel_digital_port *intel_dig_port;
> >  	struct intel_crtc *crtc;
> >  	struct drm_display_mode *mode;
> >  	struct i915_audio_component *acomp = dev_priv->audio_component;
> > -	enum pipe pipe = -1;
> > +	enum pipe pipe = INVALID_PIPE;
> >  	u32 tmp;
> >  	int n;
> >  
> > @@ -655,21 +653,12 @@ static int i915_audio_component_sync_audio_rate(struct device *dev,
> >  
> >  	mutex_lock(&dev_priv->av_mutex);
> >  	/* 1. get the pipe */
> > -	for_each_intel_encoder(drm_dev, intel_encoder) {
> > -		if (intel_encoder->type != INTEL_OUTPUT_HDMI)
> > -			continue;
> > -		intel_dig_port = enc_to_dig_port(&intel_encoder->base);
> > -		if (port == intel_dig_port->port) {
> > -			crtc = to_intel_crtc(intel_encoder->base.crtc);
> > -			if (!crtc) {
> > -				DRM_DEBUG_KMS("%s: crtc is NULL\n", __func__);
> > -				continue;
> > -			}
> > -			pipe = crtc->pipe;
> > -			break;
> > -		}
> > +	intel_encoder = dev_priv->dig_port_map[port];
> > +	if (intel_encoder && intel_encoder->type == INTEL_OUTPUT_HDMI &&
> 
> Is it really legit to call these functions with a port for which we don't
> have an encoder? WARN_ON(!encoder) here and in the other places?

Currently there are little checks in the caller side.  So I guess only
a few of them deserve WARN_ON().  The empty encoder and empty crtc
would be good with WARN_ON(), as the port is supposed to be real. 
The HDMI check may be silent as is.

> Or would
> that require some function for snd-hda to inquire i915 which ports are
> enabled (which we probably should have to avoid registering audio ports
> that aren't there)?
> 
> Otherwise lgtm.

OK, I'll add WARN_ON() to them.


thanks,

Takashi

> -Daniel
> 
> > +	    intel_encoder->base.crtc) {
> > +		crtc = to_intel_crtc(intel_encoder->base.crtc);
> > +		pipe = crtc->pipe;
> >  	}
> > -
> >  	if (pipe == INVALID_PIPE) {
> >  		DRM_DEBUG_KMS("no pipe for the port %c\n", port_name(port));
> >  		mutex_unlock(&dev_priv->av_mutex);
> > @@ -716,27 +705,21 @@ static int i915_audio_component_get_eld(struct device *dev, int port,
> >  					unsigned char *buf, int max_bytes)
> >  {
> >  	struct drm_i915_private *dev_priv = dev_to_i915(dev);
> > -	struct drm_device *drm_dev = dev_priv->dev;
> >  	struct intel_encoder *intel_encoder;
> >  	struct intel_digital_port *intel_dig_port;
> >  	const u8 *eld;
> >  	int ret = -EINVAL;
> >  
> >  	mutex_lock(&dev_priv->av_mutex);
> > -	for_each_intel_encoder(drm_dev, intel_encoder) {
> > -		if (intel_encoder->type != INTEL_OUTPUT_DISPLAYPORT &&
> > -		    intel_encoder->type != INTEL_OUTPUT_HDMI)
> > -			continue;
> > +	intel_encoder = dev_priv->dig_port_map[port];
> > +	if (intel_encoder) {
> > +		ret = 0;
> >  		intel_dig_port = enc_to_dig_port(&intel_encoder->base);
> > -		if (port == intel_dig_port->port) {
> > -			ret = 0;
> > -			*enabled = intel_dig_port->audio_connector != NULL;
> > -			if (!*enabled)
> > -				break;
> > +		*enabled = intel_dig_port->audio_connector != NULL;
> > +		if (*enabled) {
> >  			eld = intel_dig_port->audio_connector->eld;
> >  			ret = drm_eld_size(eld);
> >  			memcpy(buf, eld, min(max_bytes, ret));
> > -			break;
> >  		}
> >  	}
> >  
> > diff --git a/drivers/gpu/drm/i915/intel_ddi.c b/drivers/gpu/drm/i915/intel_ddi.c
> > index 76ce7c2960b6..59deb0d85533 100644
> > --- a/drivers/gpu/drm/i915/intel_ddi.c
> > +++ b/drivers/gpu/drm/i915/intel_ddi.c
> > @@ -3295,6 +3295,7 @@ void intel_ddi_init(struct drm_device *dev, enum port port)
> >  	intel_encoder->get_config = intel_ddi_get_config;
> >  
> >  	intel_dig_port->port = port;
> > +	dev_priv->dig_port_map[port] = intel_encoder;
> >  	intel_dig_port->saved_port_bits = I915_READ(DDI_BUF_CTL(port)) &
> >  					  (DDI_BUF_PORT_REVERSAL |
> >  					   DDI_A_4_LANES);
> > diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
> > index bec443a629da..146f5da3acb1 100644
> > --- a/drivers/gpu/drm/i915/intel_dp.c
> > +++ b/drivers/gpu/drm/i915/intel_dp.c
> > @@ -6002,6 +6002,7 @@ intel_dp_init(struct drm_device *dev,
> >  	}
> >  
> >  	intel_dig_port->port = port;
> > +	dev_priv->dig_port_map[port] = intel_encoder;
> >  	intel_dig_port->dp.output_reg = output_reg;
> >  
> >  	intel_encoder->type = INTEL_OUTPUT_DISPLAYPORT;
> > diff --git a/drivers/gpu/drm/i915/intel_hdmi.c b/drivers/gpu/drm/i915/intel_hdmi.c
> > index bdd462e7c690..c046017be786 100644
> > --- a/drivers/gpu/drm/i915/intel_hdmi.c
> > +++ b/drivers/gpu/drm/i915/intel_hdmi.c
> > @@ -2148,6 +2148,7 @@ void intel_hdmi_init_connector(struct intel_digital_port *intel_dig_port,
> >  void intel_hdmi_init(struct drm_device *dev,
> >  		     i915_reg_t hdmi_reg, enum port port)
> >  {
> > +	struct drm_i915_private *dev_priv = dev->dev_private;
> >  	struct intel_digital_port *intel_dig_port;
> >  	struct intel_encoder *intel_encoder;
> >  	struct intel_connector *intel_connector;
> > @@ -2216,6 +2217,7 @@ void intel_hdmi_init(struct drm_device *dev,
> >  		intel_encoder->cloneable |= 1 << INTEL_OUTPUT_HDMI;
> >  
> >  	intel_dig_port->port = port;
> > +	dev_priv->dig_port_map[port] = intel_encoder;
> >  	intel_dig_port->hdmi.hdmi_reg = hdmi_reg;
> >  	intel_dig_port->dp.output_reg = INVALID_MMIO_REG;
> >  
> > -- 
> > 2.6.3
> > 
> > _______________________________________________
> > Intel-gfx mailing list
> > Intel-gfx@lists.freedesktop.org
> > http://lists.freedesktop.org/mailman/listinfo/intel-gfx
> 
> -- 
> Daniel Vetter
> Software Engineer, Intel Corporation
> http://blog.ffwll.ch
> 
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