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[90.63.244.31]) by smtp.gmail.com with ESMTPSA id r18sm20184350wrx.36.2019.09.03.02.53.33 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Tue, 03 Sep 2019 02:53:34 -0700 (PDT) Subject: Re: [PATCH] drm: bridge/dw_hdmi: add audio sample channel status setting To: Cheng-Yi Chiang , linux-kernel@vger.kernel.org Cc: alsa-devel@alsa-project.org, tzungbi@chromium.org, zhengxing@rock-chips.com, kuninori.morimoto.gx@renesas.com, a.hajda@samsung.com, airlied@linux.ie, kuankuan.y@gmail.com, jeffy.chen@rock-chips.com, dianders@chromium.org, dri-devel@lists.freedesktop.org, cain.cai@rock-chips.com, linux-rockchip@lists.infradead.org, eddie.cai@rock-chips.com, Laurent.pinchart@ideasonboard.com, daniel@ffwll.ch, Yakir Yang , enric.balletbo@collabora.com, dgreid@chromium.org, sam@ravnborg.org, linux-arm-kernel@lists.infradead.org References: <20190903055103.134764-1-cychiang@chromium.org> From: Neil Armstrong Openpgp: preference=signencrypt Autocrypt: addr=narmstrong@baylibre.com; prefer-encrypt=mutual; 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Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.8.0 MIME-Version: 1.0 In-Reply-To: <20190903055103.134764-1-cychiang@chromium.org> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi, On 03/09/2019 07:51, Cheng-Yi Chiang wrote: > From: Yakir Yang > > When transmitting IEC60985 linear PCM audio, we configure the > Audio 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) > > Signed-off-by: Yakir Yang > Signed-off-by: Cheng-Yi Chiang > --- > drivers/gpu/drm/bridge/synopsys/dw-hdmi.c | 59 +++++++++++++++++++++++ > drivers/gpu/drm/bridge/synopsys/dw-hdmi.h | 20 ++++++++ > 2 files changed, 79 insertions(+) > > diff --git a/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c b/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c > index bd65d0479683..34d46e25d610 100644 > --- a/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c > +++ b/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c > @@ -582,6 +582,63 @@ static unsigned int hdmi_compute_n(unsigned int freq, unsigned long pixel_clk) > return n; > } > > +static void hdmi_set_schnl(struct dw_hdmi *hdmi) > +{ > + u8 aud_schnl_samplerate; > + u8 aud_schnl_8; > + > + /* These registers are on RK3288 using version 2.0a. */ > + if (hdmi->version != 0x200a) > + return; Are these limited to the 2.0a version *in* RK3288, or 2.0a version on all SoCs ? > + > + 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; > + > + /* This means word length is 16 bit. Refer to IEC60958-3 page 12. */ > + aud_schnl_8 |= 2 << HDMI_FC_AUDSCHNLS8_WORDLEGNTH_OFFSET; > + > + hdmi_writeb(hdmi, aud_schnl_8, HDMI_FC_AUDSCHNLS8); > +} > + > static void hdmi_set_clk_regenerator(struct dw_hdmi *hdmi, > unsigned long pixel_clk, unsigned int sample_rate) > { > @@ -620,6 +677,8 @@ static void hdmi_set_clk_regenerator(struct dw_hdmi *hdmi, > hdmi->audio_cts = cts; > hdmi_set_cts_n(hdmi, cts, hdmi->audio_enable ? n : 0); > spin_unlock_irq(&hdmi->audio_lock); > + > + hdmi_set_schnl(hdmi); > } > > static void hdmi_init_clk_regenerator(struct dw_hdmi *hdmi) > 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, >