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SubjectRe: [PATCH v2] drm: bridge/dw_hdmi: add audio sample channel status setting
On Mon, Sep 9, 2019 at 2:38 AM Russell King - ARM Linux admin
<linux@armlinux.org.uk> wrote:
>
> On Thu, Sep 05, 2019 at 05:43:25PM +0800, Cheng-Yi Chiang wrote:
> > From: Yakir Yang <ykk@rock-chips.com>
> >
> > When transmitting IEC60985 linear PCM audio, we configure the
> > Aduio Sample Channel Status information of all the channel
> > status bits in the IEC60958 frame.
> > Refer to 60958-3 page 10 for frequency, original frequency, and
> > wordlength setting.
> >
> > This fix the issue that audio does not come out on some monitors
> > (e.g. LG 22CV241)
> >
> > Note that these registers are only for interfaces:
> > I2S audio interface, General Purpose Audio (GPA), or AHB audio DMA
> > (AHBAUDDMA).
> > For S/PDIF interface this information comes from the stream.
> >
> > Currently this function dw_hdmi_set_channel_status is only called
> > from dw-hdmi-i2s-audio in I2S setup.
> >
> > Signed-off-by: Yakir Yang <ykk@rock-chips.com>
> > Signed-off-by: Cheng-Yi Chiang <cychiang@chromium.org>
> > ---
> > Original patch by Yakir Yang is at
> >
> > https://lore.kernel.org/patchwork/patch/539653/
> >
> > Change from v1 to v2:
> > 1. Remove the version check because this will only be called by
> > dw-hdmi-i2s-audio, and the registers are available in I2S setup.
> > 2. Set these registers in dw_hdmi_i2s_hw_params.
> > 3. Fix the sample width setting so it can use 16 or 24 bits.
> >
> > .../drm/bridge/synopsys/dw-hdmi-i2s-audio.c | 1 +
> > drivers/gpu/drm/bridge/synopsys/dw-hdmi.c | 70 +++++++++++++++++++
> > drivers/gpu/drm/bridge/synopsys/dw-hdmi.h | 20 ++++++
> > include/drm/bridge/dw_hdmi.h | 2 +
> > 4 files changed, 93 insertions(+)
> >
> > diff --git a/drivers/gpu/drm/bridge/synopsys/dw-hdmi-i2s-audio.c b/drivers/gpu/drm/bridge/synopsys/dw-hdmi-i2s-audio.c
> > index 34d8e837555f..b801a28b0f17 100644
> > --- a/drivers/gpu/drm/bridge/synopsys/dw-hdmi-i2s-audio.c
> > +++ b/drivers/gpu/drm/bridge/synopsys/dw-hdmi-i2s-audio.c
> > @@ -102,6 +102,7 @@ static int dw_hdmi_i2s_hw_params(struct device *dev, void *data,
> > }
> >
> > dw_hdmi_set_sample_rate(hdmi, hparms->sample_rate);
> > + dw_hdmi_set_channel_status(hdmi, hparms->sample_width);
> > dw_hdmi_set_channel_count(hdmi, hparms->channels);
> > dw_hdmi_set_channel_allocation(hdmi, hparms->cea.channel_allocation);
> >
>
> dw_hdmi_i2s_hw_params() is passed the channel status data in
> hparams->iec.status Rather than re-creating it afresh in the driver,
> I'd recommend programming the already supplied channel status data
> into the registers.
>

Hi Russell,
Thank you for pointing this out.
I did not realize that the status data is already set.
I will fix in v3 to make this patch much simpler.

> > diff --git a/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c b/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c
> > index bd65d0479683..d1daa369c8ae 100644
> > --- a/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c
> > +++ b/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c
> > @@ -582,6 +582,76 @@ static unsigned int hdmi_compute_n(unsigned int freq, unsigned long pixel_clk)
> > return n;
> > }
> >
> > +/*
> > + * When transmitting IEC60958 linear PCM audio, these registers allow to
> > + * configure the channel status information of all the channel status
> > + * bits in the IEC60958 frame. For the moment this configuration is only
> > + * used when the I2S audio interface, General Purpose Audio (GPA),
> > + * or AHB audio DMA (AHBAUDDMA) interface is active
> > + * (for S/PDIF interface this information comes from the stream).
> > + */
> > +void dw_hdmi_set_channel_status(struct dw_hdmi *hdmi,
> > + unsigned int sample_width)
> > +{
> > + u8 aud_schnl_samplerate;
> > + u8 aud_schnl_8;
> > + u8 word_length_bits;
> > +
> > + switch (hdmi->sample_rate) {
> > + case 32000:
> > + aud_schnl_samplerate = HDMI_FC_AUDSCHNLS7_SMPRATE_32K;
> > + break;
> > + case 44100:
> > + aud_schnl_samplerate = HDMI_FC_AUDSCHNLS7_SMPRATE_44K1;
> > + break;
> > + case 48000:
> > + aud_schnl_samplerate = HDMI_FC_AUDSCHNLS7_SMPRATE_48K;
> > + break;
> > + case 88200:
> > + aud_schnl_samplerate = HDMI_FC_AUDSCHNLS7_SMPRATE_88K2;
> > + break;
> > + case 96000:
> > + aud_schnl_samplerate = HDMI_FC_AUDSCHNLS7_SMPRATE_96K;
> > + break;
> > + case 176400:
> > + aud_schnl_samplerate = HDMI_FC_AUDSCHNLS7_SMPRATE_176K4;
> > + break;
> > + case 192000:
> > + aud_schnl_samplerate = HDMI_FC_AUDSCHNLS7_SMPRATE_192K;
> > + break;
> > + case 768000:
> > + aud_schnl_samplerate = HDMI_FC_AUDSCHNLS7_SMPRATE_768K;
> > + break;
> > + default:
> > + dev_warn(hdmi->dev, "Unsupported audio sample rate (%u)\n",
> > + hdmi->sample_rate);
> > + return;
> > + }
> > +
> > + /* set channel status register */
> > + hdmi_modb(hdmi, aud_schnl_samplerate, HDMI_FC_AUDSCHNLS7_SMPRATE_MASK,
> > + HDMI_FC_AUDSCHNLS7);
> > +
> > + /*
> > + * Set original frequency to be the same as frequency.
> > + * Use one-complement value as stated in IEC60958-3 page 13.
> > + */
> > + aud_schnl_8 = (~aud_schnl_samplerate) <<
> > + HDMI_FC_AUDSCHNLS8_ORIGSAMPFREQ_OFFSET;
> > +
> > + /*
> > + * Refer to IEC60958-3 page 12. We can accept 16 bits or 24 bits.
> > + * Otherwise, set the register to 0t o indicate using default value.
> > + */
> > + word_length_bits = (sample_width == 16) ? 0x2 :
> > + ((sample_width == 24) ? 0xb : 0);
> > +
> > + aud_schnl_8 |= word_length_bits << HDMI_FC_AUDSCHNLS8_WORDLEGNTH_OFFSET;
> > +
> > + hdmi_writeb(hdmi, aud_schnl_8, HDMI_FC_AUDSCHNLS8);
> > +}
> > +EXPORT_SYMBOL_GPL(dw_hdmi_set_channel_status);
>
> As mentioned above, the channel status data is actually already
> provided - so we don't really need the above at all. It just
> needs the data programmed into the registers.
>
ACK
> > +
> > static void hdmi_set_clk_regenerator(struct dw_hdmi *hdmi,
> > unsigned long pixel_clk, unsigned int sample_rate)
> > {
> > diff --git a/drivers/gpu/drm/bridge/synopsys/dw-hdmi.h b/drivers/gpu/drm/bridge/synopsys/dw-hdmi.h
> > index 6988f12d89d9..619ebc1c8354 100644
> > --- a/drivers/gpu/drm/bridge/synopsys/dw-hdmi.h
> > +++ b/drivers/gpu/drm/bridge/synopsys/dw-hdmi.h
> > @@ -158,6 +158,17 @@
> > #define HDMI_FC_SPDDEVICEINF 0x1062
> > #define HDMI_FC_AUDSCONF 0x1063
> > #define HDMI_FC_AUDSSTAT 0x1064
> > +#define HDMI_FC_AUDSV 0x1065
> > +#define HDMI_FC_AUDSU 0x1066
> > +#define HDMI_FC_AUDSCHNLS0 0x1067
> > +#define HDMI_FC_AUDSCHNLS1 0x1068
> > +#define HDMI_FC_AUDSCHNLS2 0x1069
> > +#define HDMI_FC_AUDSCHNLS3 0x106a
> > +#define HDMI_FC_AUDSCHNLS4 0x106b
> > +#define HDMI_FC_AUDSCHNLS5 0x106c
> > +#define HDMI_FC_AUDSCHNLS6 0x106d
> > +#define HDMI_FC_AUDSCHNLS7 0x106e
> > +#define HDMI_FC_AUDSCHNLS8 0x106f
> > #define HDMI_FC_DATACH0FILL 0x1070
> > #define HDMI_FC_DATACH1FILL 0x1071
> > #define HDMI_FC_DATACH2FILL 0x1072
> > @@ -706,6 +717,15 @@ enum {
> > /* HDMI_FC_AUDSCHNLS7 field values */
> > HDMI_FC_AUDSCHNLS7_ACCURACY_OFFSET = 4,
> > HDMI_FC_AUDSCHNLS7_ACCURACY_MASK = 0x30,
> > + HDMI_FC_AUDSCHNLS7_SMPRATE_MASK = 0x0f,
> > + HDMI_FC_AUDSCHNLS7_SMPRATE_192K = 0xe,
> > + HDMI_FC_AUDSCHNLS7_SMPRATE_176K4 = 0xc,
> > + HDMI_FC_AUDSCHNLS7_SMPRATE_96K = 0xa,
> > + HDMI_FC_AUDSCHNLS7_SMPRATE_768K = 0x9,
> > + HDMI_FC_AUDSCHNLS7_SMPRATE_88K2 = 0x8,
> > + HDMI_FC_AUDSCHNLS7_SMPRATE_32K = 0x3,
> > + HDMI_FC_AUDSCHNLS7_SMPRATE_48K = 0x2,
> > + HDMI_FC_AUDSCHNLS7_SMPRATE_44K1 = 0x0,
>
> These look very much like the IEC958_AES* consumer definitions in
> include/sound/asoundef.h.
ACK. Will remove in v3.
>
> > /* HDMI_FC_AUDSCHNLS8 field values */
> > HDMI_FC_AUDSCHNLS8_ORIGSAMPFREQ_MASK = 0xf0,
> > diff --git a/include/drm/bridge/dw_hdmi.h b/include/drm/bridge/dw_hdmi.h
> > index cf528c289857..12144d2f80f4 100644
> > --- a/include/drm/bridge/dw_hdmi.h
> > +++ b/include/drm/bridge/dw_hdmi.h
> > @@ -156,6 +156,8 @@ void dw_hdmi_setup_rx_sense(struct dw_hdmi *hdmi, bool hpd, bool rx_sense);
> >
> > void dw_hdmi_set_sample_rate(struct dw_hdmi *hdmi, unsigned int rate);
> > void dw_hdmi_set_channel_count(struct dw_hdmi *hdmi, unsigned int cnt);
> > +void dw_hdmi_set_channel_status(struct dw_hdmi *hdmi,
> > + unsigned int sample_width);
> > void dw_hdmi_set_channel_allocation(struct dw_hdmi *hdmi, unsigned int ca);
> > void dw_hdmi_audio_enable(struct dw_hdmi *hdmi);
> > void dw_hdmi_audio_disable(struct dw_hdmi *hdmi);
> > --
> > 2.23.0.187.g17f5b7556c-goog
> >
> >
> > _______________________________________________
> > linux-arm-kernel mailing list
> > linux-arm-kernel@lists.infradead.org
> > http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
> >
>
> --
> RMK's Patch system: https://www.armlinux.org.uk/developer/patches/
> FTTC broadband for 0.8mile line in suburbia: sync at 12.1Mbps down 622kbps up
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