On Thu, Sep 12, 2019 at 12:54 AM Jernej Škrabec jernej.skrabec@siol.net wrote:
Dne sreda, 11. september 2019 ob 18:23:59 CEST je Neil Armstrong napisal(a):
On 11/09/2019 10:26, 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 in the IEC60958 frame. The status bit is already available in iec.status of hdmi_codec_params.
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
Change from v2 to v3:
Reuse what is already set in iec.status in hw_param.
Remove all useless definition of registers and values.
Note that the original sampling frequency is not written to
the channel status as we reuse create_iec958_consumer in pcm_iec958.c. Without that it can still play audio fine.
.../drm/bridge/synopsys/dw-hdmi-i2s-audio.c | 1 + drivers/gpu/drm/bridge/synopsys/dw-hdmi.c | 20 +++++++++++++++++++ drivers/gpu/drm/bridge/synopsys/dw-hdmi.h | 2 ++ include/drm/bridge/dw_hdmi.h | 1 + 4 files changed, 24 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..20f4f92dd866 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->iec.status);
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..aa7efd4da1c8 100644 --- a/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c +++ b/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c @@ -582,6 +582,26 @@ 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,
u8 *channel_status)+{
- /*
- Set channel status register for frequency and word length.
- Use default values for other registers.
- */
- hdmi_writeb(hdmi, channel_status[3], HDMI_FC_AUDSCHNLS7);
- hdmi_writeb(hdmi, channel_status[4], 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..fcff5059db24 100644 --- a/drivers/gpu/drm/bridge/synopsys/dw-hdmi.h +++ b/drivers/gpu/drm/bridge/synopsys/dw-hdmi.h @@ -158,6 +158,8 @@
#define HDMI_FC_SPDDEVICEINF 0x1062 #define HDMI_FC_AUDSCONF 0x1063 #define HDMI_FC_AUDSSTAT 0x1064
+#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
diff --git a/include/drm/bridge/dw_hdmi.h b/include/drm/bridge/dw_hdmi.h index cf528c289857..4b3e863c4f8a 100644 --- a/include/drm/bridge/dw_hdmi.h +++ b/include/drm/bridge/dw_hdmi.h @@ -156,6 +156,7 @@ 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, u8 *channel_status);
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);
Looks fine for me: Reviewed-by: Neil Armstrong narmstrong@baylibre.com
Jonas ? Jernej ? Russell ?
Patch itself is fine, I'm just wondering if more information should be copied from status array to registers. But I think they are not 1:1 mapping so some more work would be needed. Anyway, patch is:
Hi Jernej, Yes you are right. I was thinking about the same thing. But there are also some fields in the IEC60958 spec not mapped to the registers on dw-hdmi. So I ended up just writing the two registers in the original ykk's patch, and ignoring "original sampling frequency" like pcm_iec958. It turns out that audio plays fine on my LG monitor. So I suggest we can keep this patch as simple as it is, and add more register setting if we find issue. Thanks!
Reviewed-by: Jernej Skrabec jernej.skrabec@siol.net
Best regards, Jernej
If it's ok for you I'll apply it.
Neil