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drm/bridge: dw-hdmi: handle ELD when DRM_BRIDGE_ATTACH_NO_CONNECTOR

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[ Upstream commit 3f2532d65a ]

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 (or not), and an eventual connector is known only
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@googlemail.com>
Signed-off-by: Neil Armstrong <narmstrong@baylibre.com>
[narmstrong: fixed typo in commit log]
Acked-by: Jernej Skrabec <jernej.skrabec@gmail.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20211029135947.3022875-1-narmstrong@baylibre.com
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Neil Armstrong 2021-10-29 15:59:47 +02:00 committed by Greg Kroah-Hartman
parent fbcd1e9f8a
commit 0dedaf16ca
4 changed files with 27 additions and 8 deletions
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10
drivers/gpu/drm/bridge/synopsys/dw-hdmi-ahb-audio.c
View file

@ -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)

4
drivers/gpu/drm/bridge/synopsys/dw-hdmi-audio.h
View file

@ -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

9
drivers/gpu/drm/bridge/synopsys/dw-hdmi-i2s-audio.c
View file

@ -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;
}

12
drivers/gpu/drm/bridge/synopsys/dw-hdmi.c
View file

@ -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);
@ -3431,7 +3439,7 @@ 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;
@ -3444,7 +3452,7 @@ 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;