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Date: Fri, 12 Nov 2021 10:01:29 +0100
From: Neil Armstrong <narmstrong@...libre.com>
To: Jernej Škrabec <jernej.skrabec@...il.com>,
a.hajda@...sung.com, Laurent.pinchart@...asonboard.com,
robert.foss@...aro.org, jonas@...boo.se
Cc: daniel@...ll.ch, dri-devel@...ts.freedesktop.org,
linux-kernel@...r.kernel.org,
Martin Blumenstingl <martin.blumenstingl@...glemail.com>
Subject: Re: [PATCH] drm/bridge: dw-hdmi: handle ELD when
DRM_BRIDGE_ATTACH_NO_CONNECTOR
Hi Jernej,
On 10/11/2021 20:20, Jernej Škrabec wrote:
> Hi Neil,
>
> sorry for late response.
>
> Dne petek, 29. oktober 2021 ob 15:59:47 CET je Neil Armstrong napisal(a):
>> The current ELD handling takes the internal connector ELD buffer and
>> shares it to the I2S and AHB sub-driver.
>>
>> But with DRM_BRIDGE_ATTACH_NO_CONNECTOR, the connector is created
>> elsewhere (not not), and an eventual connector is known only
>
> ^ typo, 2x "not"
thx, fixing while applying !
>
> Other than that, it looks good.
>
> Acked-by: Jernej Skrabec <jernej.skrabec@...il.com>
Applying to drm-misc-next
Thanks,
Neil
>
> Best regards,
> Jernej
>
>> if the bridge chain up to a connector is enabled.
>>
>> The current dw-hdmi code gets the current connector from
>> atomic_enable() so use the already stored connector pointer and
>> replace the buffer pointer with a callback returning the current
>> connector ELD buffer.
>>
>> Since a connector is not always available, either pass an empty
>> ELD to the alsa HDMI driver or don't call snd_pcm_hw_constraint_eld()
>> in AHB driver.
>>
>> Reported-by: Martin Blumenstingl <martin.blumenstingl@...glemail.com>
>> Signed-off-by: Neil Armstrong <narmstrong@...libre.com>
>> ---
>> drivers/gpu/drm/bridge/synopsys/dw-hdmi-ahb-audio.c | 10 +++++++---
>> drivers/gpu/drm/bridge/synopsys/dw-hdmi-audio.h | 4 ++--
>> drivers/gpu/drm/bridge/synopsys/dw-hdmi-i2s-audio.c | 9 ++++++++-
>> drivers/gpu/drm/bridge/synopsys/dw-hdmi.c | 12 ++++++++++--
>> 4 files changed, 27 insertions(+), 8 deletions(-)
>>
>> diff --git a/drivers/gpu/drm/bridge/synopsys/dw-hdmi-ahb-audio.c b/drivers/
> gpu/drm/bridge/synopsys/dw-hdmi-ahb-audio.c
>> index d0db1acf11d7..7d2ed0ed2fe2 100644
>> --- a/drivers/gpu/drm/bridge/synopsys/dw-hdmi-ahb-audio.c
>> +++ b/drivers/gpu/drm/bridge/synopsys/dw-hdmi-ahb-audio.c
>> @@ -320,13 +320,17 @@ static int dw_hdmi_open(struct snd_pcm_substream
> *substream)
>> struct snd_pcm_runtime *runtime = substream->runtime;
>> struct snd_dw_hdmi *dw = substream->private_data;
>> void __iomem *base = dw->data.base;
>> + u8 *eld;
>> int ret;
>>
>> runtime->hw = dw_hdmi_hw;
>>
>> - ret = snd_pcm_hw_constraint_eld(runtime, dw->data.eld);
>> - if (ret < 0)
>> - return ret;
>> + eld = dw->data.get_eld(dw->data.hdmi);
>> + if (eld) {
>> + ret = snd_pcm_hw_constraint_eld(runtime, eld);
>> + if (ret < 0)
>> + return ret;
>> + }
>>
>> ret = snd_pcm_limit_hw_rates(runtime);
>> if (ret < 0)
>> diff --git a/drivers/gpu/drm/bridge/synopsys/dw-hdmi-audio.h b/drivers/gpu/
> drm/bridge/synopsys/dw-hdmi-audio.h
>> index cb07dc0da5a7..f72d27208ebe 100644
>> --- a/drivers/gpu/drm/bridge/synopsys/dw-hdmi-audio.h
>> +++ b/drivers/gpu/drm/bridge/synopsys/dw-hdmi-audio.h
>> @@ -9,15 +9,15 @@ struct dw_hdmi_audio_data {
>> void __iomem *base;
>> int irq;
>> struct dw_hdmi *hdmi;
>> - u8 *eld;
>> + u8 *(*get_eld)(struct dw_hdmi *hdmi);
>> };
>>
>> struct dw_hdmi_i2s_audio_data {
>> struct dw_hdmi *hdmi;
>> - u8 *eld;
>>
>> void (*write)(struct dw_hdmi *hdmi, u8 val, int offset);
>> u8 (*read)(struct dw_hdmi *hdmi, int offset);
>> + u8 *(*get_eld)(struct dw_hdmi *hdmi);
>> };
>>
>> #endif
>> 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 feb04f127b55..f50b47ac11a8 100644
>> --- a/drivers/gpu/drm/bridge/synopsys/dw-hdmi-i2s-audio.c
>> +++ b/drivers/gpu/drm/bridge/synopsys/dw-hdmi-i2s-audio.c
>> @@ -135,8 +135,15 @@ static int dw_hdmi_i2s_get_eld(struct device *dev, void
> *data, uint8_t *buf,
>> size_t len)
>> {
>> struct dw_hdmi_i2s_audio_data *audio = data;
>> + u8 *eld;
>> +
>> + eld = audio->get_eld(audio->hdmi);
>> + if (eld)
>> + memcpy(buf, eld, min_t(size_t, MAX_ELD_BYTES, len));
>> + else
>> + /* Pass en empty ELD if connector not available */
>> + memset(buf, 0, len);
>>
>> - memcpy(buf, audio->eld, min_t(size_t, MAX_ELD_BYTES, len));
>> return 0;
>> }
>>
>> diff --git a/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c b/drivers/gpu/drm/
> bridge/synopsys/dw-hdmi.c
>> index 62ae63565d3a..54d8fdad395f 100644
>> --- a/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c
>> +++ b/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c
>> @@ -757,6 +757,14 @@ static void hdmi_enable_audio_clk(struct dw_hdmi *hdmi,
> bool enable)
>> hdmi_writeb(hdmi, hdmi->mc_clkdis, HDMI_MC_CLKDIS);
>> }
>>
>> +static u8 *hdmi_audio_get_eld(struct dw_hdmi *hdmi)
>> +{
>> + if (!hdmi->curr_conn)
>> + return NULL;
>> +
>> + return hdmi->curr_conn->eld;
>> +}
>> +
>> static void dw_hdmi_ahb_audio_enable(struct dw_hdmi *hdmi)
>> {
>> hdmi_set_cts_n(hdmi, hdmi->audio_cts, hdmi->audio_n);
>> @@ -3432,7 +3440,7 @@ struct dw_hdmi *dw_hdmi_probe(struct platform_device
> *pdev,
>> audio.base = hdmi->regs;
>> audio.irq = irq;
>> audio.hdmi = hdmi;
>> - audio.eld = hdmi->connector.eld;
>> + audio.get_eld = hdmi_audio_get_eld;
>> hdmi->enable_audio = dw_hdmi_ahb_audio_enable;
>> hdmi->disable_audio = dw_hdmi_ahb_audio_disable;
>>
>> @@ -3445,7 +3453,7 @@ struct dw_hdmi *dw_hdmi_probe(struct platform_device
> *pdev,
>> struct dw_hdmi_i2s_audio_data audio;
>>
>> audio.hdmi = hdmi;
>> - audio.eld = hdmi->connector.eld;
>> + audio.get_eld = hdmi_audio_get_eld;
>> audio.write = hdmi_writeb;
>> audio.read = hdmi_readb;
>> hdmi->enable_audio = dw_hdmi_i2s_audio_enable;
>> --
>> 2.25.1
>>
>>
>
>
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