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SubjectRe: [PATCH] drm: bridge/dw_hdmi: add audio sample channel status setting
On Wed, Sep 4, 2019 at 2:00 AM Neil Armstrong <narmstrong@baylibre.com> wrote:
>
> Hi,
>
> Le 03/09/2019 à 11:53, Neil Armstrong a écrit :
> > Hi,
> >
> > On 03/09/2019 07:51, Cheng-Yi Chiang wrote:
> >> From: Yakir Yang <ykk@rock-chips.com>
> >>
> >> 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 <ykk@rock-chips.com>
> >> Signed-off-by: Cheng-Yi Chiang <cychiang@chromium.org>
> >> ---
> >> 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 ?
>
> After investigations, Amlogic sets these registers on their 2.0a version
> aswell, and Jernej (added in Cc) reported me Allwinner sets them on their
> < 2.0a and > 2.0a IPs versions.
>
> Can you check on the Rockchip IP versions in RK3399 ?
>
Sorry, the RK3399 board I am using is using DP, not HDMI.
But I found that on rockchip's tree at

https://github.com/rockchip-linux/kernel/commit/924f480383c982da9908fb96d6bbb580b25545a5#diff-f74b4cfb23436a137a9338a5af3fbb3dR172

There is such register setting, so I think RK3399 should have the same register.


> For reference, the HDMI 1.4a IP version allwinner setups is:
> https://github.com/Allwinner-Homlet/H3-BSP4.4-linux/blob/master/drivers/video/fbdev/sunxi/disp2/hdmi/hdmi_bsp_sun8iw7.c#L531-L539
> (registers a "scrambled" but a custom bit can reset to the original mapping,
> 0x1066 ... 0x106f)

I see.. so 1.4 has this register.
I can modify the check to be >= 1.4 then.
Will fix in v2.

Thanks!

>
> Neil
>
> >
> >> +
> >> + 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,
> >>
> >

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