[Intel-gfx] [PATCH 2/7] drm/i915: add DisplayPort amp unmute for LPE audio mode
Ville Syrjälä
ville.syrjala at linux.intel.com
Wed Feb 1 15:11:37 UTC 2017
On Wed, Feb 01, 2017 at 03:53:49PM +0100, Takashi Iwai wrote:
> On Wed, 01 Feb 2017 15:45:24 +0100,
> Ville Syrjälä wrote:
> >
> > On Tue, Jan 31, 2017 at 10:36:44PM +0100, Takashi Iwai wrote:
> > > From: Pierre-Louis Bossart <pierre-louis.bossart at linux.intel.com>
> > >
> > > Enable unmute/mute amp notification. This doesn't seem to affect
> > > HDMI support so this is done unconditionally.
> > >
> > > An earlier version of this patch set a chicken bit at address 0x62F38
> > > prior to the mute/unmute but this register doesn't seem to do anything
> > > so this phase was removed.
> > >
> > > Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart at linux.intel.com>
> > > Signed-off-by: Takashi Iwai <tiwai at suse.de>
> > > ---
> > > drivers/gpu/drm/i915/i915_reg.h | 10 ++++++++++
> > > drivers/gpu/drm/i915/intel_lpe_audio.c | 17 +++++++++++++++++
> > > 2 files changed, 27 insertions(+)
> > >
> > > diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
> > > index a9ffc8df241b..8fcc80cb864b 100644
> > > --- a/drivers/gpu/drm/i915/i915_reg.h
> > > +++ b/drivers/gpu/drm/i915/i915_reg.h
> > > @@ -2061,6 +2061,16 @@ enum skl_disp_power_wells {
> > > #define I915_HDMI_LPE_AUDIO_BASE (VLV_DISPLAY_BASE + 0x65000)
> > > #define I915_HDMI_LPE_AUDIO_SIZE 0x1000
> > >
> > > +/* DisplayPort Audio w/ LPE */
> > > +#define VLV_AUD_PORT_EN_B_DBG (VLV_DISPLAY_BASE + 0x62F20)
> > > +#define VLV_AUD_PORT_EN_C_DBG (VLV_DISPLAY_BASE + 0x62F30)
> > > +#define VLV_AUD_PORT_EN_D_DBG (VLV_DISPLAY_BASE + 0x62F34)
> > > +#define VLV_AUD_PORT_EN_DBG(port) _MMIO_PORT3((port) - PORT_B, \
> > > + VLV_AUD_PORT_EN_B_DBG, \
> > > + VLV_AUD_PORT_EN_C_DBG, \
> > > + VLV_AUD_PORT_EN_D_DBG)
> > > +#define VLV_AMP_MUTE (1 << 1)
> > > +
> > > #define GEN6_BSD_RNCID _MMIO(0x12198)
> > >
> > > #define GEN7_FF_THREAD_MODE _MMIO(0x20a0)
> > > diff --git a/drivers/gpu/drm/i915/intel_lpe_audio.c b/drivers/gpu/drm/i915/intel_lpe_audio.c
> > > index 245523e14418..f95624a46f27 100644
> > > --- a/drivers/gpu/drm/i915/intel_lpe_audio.c
> > > +++ b/drivers/gpu/drm/i915/intel_lpe_audio.c
> > > @@ -337,15 +337,25 @@ void intel_lpe_audio_notify(struct drm_i915_private *dev_priv,
> > > {
> > > unsigned long irq_flags;
> > > struct intel_hdmi_lpe_audio_pdata *pdata = NULL;
> > > + u32 audio_enable;
> > > + i915_reg_t mmio;
> > >
> > > if (!HAS_LPE_AUDIO(dev_priv))
> > > return;
> > >
> > > + if (port == PORT_A) {
> > > + DRM_ERROR("PORT_A is not valid for HDMI/DP usages\n");
> > > + return;
> > > + }
> >
> > Port A doesn't exists on these platforms at all. So this is
> > just dead code.
> >
> > > +
> > > pdata = dev_get_platdata(
> > > &(dev_priv->lpe_audio.platdev->dev));
> > >
> > > spin_lock_irqsave(&pdata->lpe_audio_slock, irq_flags);
> > >
> > > + mmio = VLV_AUD_PORT_EN_DBG(port);
> >
> > I'm not a fan of these temporary reg offset variables. Makes it hard to
> > figure out later which register is being frobbed, especially when the
> > variable name doesn't say what it actually is (like in this case). So
> > I'd like to see this killed off.
>
> How about something like below?
>
>
> thanks,
>
> Takashi
>
> -- 8< --
> From: Pierre-Louis Bossart <pierre-louis.bossart at linux.intel.com>
> Subject: [PATCH v2] drm/i915: add DisplayPort amp unmute for LPE audio mode
>
> Enable unmute/mute amp notification. This doesn't seem to affect
> HDMI support so this is done unconditionally.
>
> An earlier version of this patch set a chicken bit at address 0x62F38
> prior to the mute/unmute but this register doesn't seem to do anything
> so this phase was removed.
>
> v1->v2: Drop needless pipe A check, avoid temporary reg offset variable.
>
> Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart at linux.intel.com>
> Signed-off-by: Takashi Iwai <tiwai at suse.de>
> ---
> drivers/gpu/drm/i915/i915_reg.h | 10 ++++++++++
> drivers/gpu/drm/i915/intel_lpe_audio.c | 12 ++++++++++++
> 2 files changed, 22 insertions(+)
>
> diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
> index a9ffc8df241b..8fcc80cb864b 100644
> --- a/drivers/gpu/drm/i915/i915_reg.h
> +++ b/drivers/gpu/drm/i915/i915_reg.h
> @@ -2061,6 +2061,16 @@ enum skl_disp_power_wells {
> #define I915_HDMI_LPE_AUDIO_BASE (VLV_DISPLAY_BASE + 0x65000)
> #define I915_HDMI_LPE_AUDIO_SIZE 0x1000
>
> +/* DisplayPort Audio w/ LPE */
> +#define VLV_AUD_PORT_EN_B_DBG (VLV_DISPLAY_BASE + 0x62F20)
> +#define VLV_AUD_PORT_EN_C_DBG (VLV_DISPLAY_BASE + 0x62F30)
> +#define VLV_AUD_PORT_EN_D_DBG (VLV_DISPLAY_BASE + 0x62F34)
We generally like to prefix the raw register offsets with '_' to make
it clear they're not to be used directly.
With that fixed the i915 patches are
Acked-by: Ville Syrjälä <ville.syrjala at linux.intel.com>
> +#define VLV_AUD_PORT_EN_DBG(port) _MMIO_PORT3((port) - PORT_B, \
> + VLV_AUD_PORT_EN_B_DBG, \
> + VLV_AUD_PORT_EN_C_DBG, \
> + VLV_AUD_PORT_EN_D_DBG)
> +#define VLV_AMP_MUTE (1 << 1)
> +
> #define GEN6_BSD_RNCID _MMIO(0x12198)
>
> #define GEN7_FF_THREAD_MODE _MMIO(0x20a0)
> diff --git a/drivers/gpu/drm/i915/intel_lpe_audio.c b/drivers/gpu/drm/i915/intel_lpe_audio.c
> index 245523e14418..5da14f40f94a 100644
> --- a/drivers/gpu/drm/i915/intel_lpe_audio.c
> +++ b/drivers/gpu/drm/i915/intel_lpe_audio.c
> @@ -337,6 +337,7 @@ void intel_lpe_audio_notify(struct drm_i915_private *dev_priv,
> {
> unsigned long irq_flags;
> struct intel_hdmi_lpe_audio_pdata *pdata = NULL;
> + u32 audio_enable;
>
> if (!HAS_LPE_AUDIO(dev_priv))
> return;
> @@ -346,6 +347,8 @@ void intel_lpe_audio_notify(struct drm_i915_private *dev_priv,
>
> spin_lock_irqsave(&pdata->lpe_audio_slock, irq_flags);
>
> + audio_enable = I915_READ(VLV_AUD_PORT_EN_DBG(port));
> +
> if (eld != NULL) {
> memcpy(pdata->eld.eld_data, eld,
> HDMI_MAX_ELD_BYTES);
> @@ -357,11 +360,20 @@ void intel_lpe_audio_notify(struct drm_i915_private *dev_priv,
> pdata->tmds_clock_speed = tmds_clk_speed;
> if (link_rate)
> pdata->link_rate = link_rate;
> +
> + /* Unmute the amp for both DP and HDMI */
> + I915_WRITE(VLV_AUD_PORT_EN_DBG(port),
> + audio_enable & ~VLV_AMP_MUTE);
> +
> } else {
> memset(pdata->eld.eld_data, 0,
> HDMI_MAX_ELD_BYTES);
> pdata->hdmi_connected = false;
> pdata->dp_output = false;
> +
> + /* Mute the amp for both DP and HDMI */
> + I915_WRITE(VLV_AUD_PORT_EN_DBG(port),
> + audio_enable | VLV_AMP_MUTE);
> }
>
> if (pdata->notify_audio_lpe)
> --
> 2.11.0
--
Ville Syrjälä
Intel OTC
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