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

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On Thu, 10 Dec 2015 10:38:14 +0100,
Daniel Vetter wrote:
> 
> On Tue, Dec 08, 2015 at 06:42:09PM +0100, Takashi Iwai wrote:
> > On Mon, 07 Dec 2015 10:41:51 +0100,
> > Takashi Iwai wrote:
> > > 
> > > 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@xxxxxxx>
> > > > > ---
> > > > > 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.
> > 
> > It turned out that the encoder might be NULL for MST, as currently
> > it's not set properly yet.  So WARN_ON() will splat too much
> > unnecessarily.
> > 
> > Though, I rewrote a bit about the check and give a bit more messages.
> > Below is the revised patch.  So far, I have only this change, so I
> > hesitate to resubmit the whole patchset.  If a full patchset is
> > still preferred, let me know.
> 
> Imo this note about mst should be in the commit message. lgtm otherwise.

OK, I'll update the changelog.

> Do you plan to prep a topic branch with all the patches that we could pull
> into both snd and drm-intel trees?

Yes, currently test/hdmi-jack branch contains these based on drm-next
and some sound updates.

> Note that for 4.5 features drm-intel closes next week, so not that much
> time left.

Yeah, I'd like to merge this stuff soonishly, too.


thanks,

Takashi

> -Daniel
> 
> > 
> > 
> > thanks,
> > 
> > Takashi
> > 
> > -- 8< --
> > From: Takashi Iwai <tiwai@xxxxxxx>
> > Subject: [PATCH v4] drm/i915: Add reverse mapping between port and intel_encoder
> > 
> > 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@xxxxxxx>
> > ---
> > v3->v4: add a bit more verbose check for NULL encoder, etc.
> > 
> >  drivers/gpu/drm/i915/i915_drv.h    |  2 ++
> >  drivers/gpu/drm/i915/intel_audio.c | 57 +++++++++++++++-----------------------
> >  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, 28 insertions(+), 35 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..6380b2400448 100644
> > --- a/drivers/gpu/drm/i915/intel_audio.c
> > +++ b/drivers/gpu/drm/i915/intel_audio.c
> > @@ -636,15 +636,14 @@ 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;
> > +	int err = 0;
> >  
> >  	/* HSW, BDW, SKL, KBL need this fix */
> >  	if (!IS_SKYLAKE(dev_priv) &&
> > @@ -655,26 +654,21 @@ 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->base.crtc ||
> > +	    intel_encoder->type != INTEL_OUTPUT_HDMI) {
> > +		DRM_DEBUG_KMS("no valid port %c\n", port_name(port));
> > +		err = -ENODEV;
> > +		goto unlock;
> >  	}
> > -
> > +	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);
> > -		return -ENODEV;
> > +		err = -ENODEV;
> > +		goto unlock;
> >  	}
> > +
> >  	DRM_DEBUG_KMS("pipe %c connects port %c\n",
> >  				  pipe_name(pipe), port_name(port));
> >  	mode = &crtc->config->base.adjusted_mode;
> > @@ -687,8 +681,7 @@ static int i915_audio_component_sync_audio_rate(struct device *dev,
> >  		tmp = I915_READ(HSW_AUD_CFG(pipe));
> >  		tmp &= ~AUD_CONFIG_N_PROG_ENABLE;
> >  		I915_WRITE(HSW_AUD_CFG(pipe), tmp);
> > -		mutex_unlock(&dev_priv->av_mutex);
> > -		return 0;
> > +		goto unlock;
> >  	}
> >  
> >  	n = audio_config_get_n(mode, rate);
> > @@ -698,8 +691,7 @@ static int i915_audio_component_sync_audio_rate(struct device *dev,
> >  		tmp = I915_READ(HSW_AUD_CFG(pipe));
> >  		tmp &= ~AUD_CONFIG_N_PROG_ENABLE;
> >  		I915_WRITE(HSW_AUD_CFG(pipe), tmp);
> > -		mutex_unlock(&dev_priv->av_mutex);
> > -		return 0;
> > +		goto unlock;
> >  	}
> >  
> >  	/* 3. set the N/CTS/M */
> > @@ -707,8 +699,9 @@ static int i915_audio_component_sync_audio_rate(struct device *dev,
> >  	tmp = audio_config_setup_n_reg(n, tmp);
> >  	I915_WRITE(HSW_AUD_CFG(pipe), tmp);
> >  
> > + unlock:
> >  	mutex_unlock(&dev_priv->av_mutex);
> > -	return 0;
> > +	return err;
> >  }
> >  
> >  static int i915_audio_component_get_eld(struct device *dev, int port,
> > @@ -716,27 +709,21 @@ 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 e1ceff7ab265..e1456ead5c53 100644
> > --- a/drivers/gpu/drm/i915/intel_dp.c
> > +++ b/drivers/gpu/drm/i915/intel_dp.c
> > @@ -6003,6 +6003,7 @@ 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
> > 
> 
> -- 
> Daniel Vetter
> Software Engineer, Intel Corporation
> http://blog.ffwll.ch
> 
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