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From:   Jernej =?utf-8?B?xaBrcmFiZWM=?= <jernej.skrabec@siol.net>
To:     Cheng-Yi Chiang <cychiang@chromium.org>
Cc:     linux-kernel@vger.kernel.org, alsa-devel@alsa-project.org,
        linux-arm-kernel@lists.infradead.org,
        linux-rockchip@lists.infradead.org, a.hajda@samsung.com,
        Laurent.pinchart@ideasonboard.com, airlied@linux.ie,
        daniel@ffwll.ch, kuninori.morimoto.gx@renesas.com,
        sam@ravnborg.org, dianders@chromium.org, dgreid@chromium.org,
        tzungbi@chromium.org, zhengxing@rock-chips.com,
        cain.cai@rock-chips.com, eddie.cai@rock-chips.com,
        jeffy.chen@rock-chips.com, kuankuan.y@gmail.com,
        enric.balletbo@collabora.com, dri-devel@lists.freedesktop.org,
        jonas@kwiboo.se, Yakir Yang <ykk@rock-chips.com>
Subject: Re: [PATCH v2] drm: bridge/dw_hdmi: add audio sample channel status setting
Date:   Sun, 08 Sep 2019 20:18:19 +0200
Message-ID: <7000610.EoTGzQ87Ws@jernej-laptop>
In-Reply-To: <20190905094325.33156-1-cychiang@chromium.org>
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Dne četrtek, 05. september 2019 ob 11:43:25 CEST je Cheng-Yi Chiang 
napisal(a):
> 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);
> 
> 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.

Nit: "0t 0" -> "0 to"

With that fixed, this patch is:
Reviewed-by: Jernej Skrabec <jernej.skrabec@siol.net>

Best regards,
Jernej

> +	 */
> +	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);
> +
>  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,
> 
>  /* 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);