Re: [v6,02/21] drm/bridge: adv7511: Register and attach our DSI device at probe

[Marek Szyprowski]

Hi,

On 25.10.2021 17:15, Maxime Ripard wrote:
> In order to avoid any probe ordering issue, the best practice is to move
> the secondary MIPI-DSI device registration and attachment to the
> MIPI-DSI host at probe time. Let's do this.
>
> Acked-by: Sam Ravnborg <sam@xxxxxxxxxxxx>
> Tested-by: John Stultz <john.stultz@xxxxxxxxxx>
> Signed-off-by: Maxime Ripard <maxime@xxxxxxxxxx>

This patch landed in linux-next as commit 864c49a31d6b ("drm/bridge: 
adv7511: Register and attach our DSI device at probe"). Sadly it causes 
endless probe-fail-defer loop on DragonBoard 410c board 
(arch/arm64/boot/dts/qcom/apq8016-sbc.dts):

qcom,pm8916-wcd-spmi-codec 200f000.spmi:pmic@1:audio-codec@f000: PMIC 
REV: 1      CODEC Version: 1
qcom,pm8916-wcd-spmi-codec 200f000.spmi:pmic@1:audio-codec@f000: ASoC: 
sink widget PDM_RX1 overwritten
qcom,pm8916-wcd-spmi-codec 200f000.spmi:pmic@1:audio-codec@f000: ASoC: 
source widget PDM_RX1 overwritten
qcom,pm8916-wcd-spmi-codec 200f000.spmi:pmic@1:audio-codec@f000: ASoC: 
source widget PDM_RX1 overwritten
qcom,pm8916-wcd-spmi-codec 200f000.spmi:pmic@1:audio-codec@f000: ASoC: 
sink widget PDM_RX1 overwritten
qcom,pm8916-wcd-spmi-codec 200f000.spmi:pmic@1:audio-codec@f000: ASoC: 
sink widget PDM_RX1 overwritten
qcom,pm8916-wcd-spmi-codec 200f000.spmi:pmic@1:audio-codec@f000: ASoC: 
sink widget ADC1 overwritten
qcom,pm8916-wcd-spmi-codec 200f000.spmi:pmic@1:audio-codec@f000: ASoC: 
sink widget ADC1 overwritten
qcom,pm8916-wcd-spmi-codec 200f000.spmi:pmic@1:audio-codec@f000: ASoC: 
sink widget PDM_RX1 overwritten
qcom,pm8916-wcd-spmi-codec 200f000.spmi:pmic@1:audio-codec@f000: ASoC: 
source widget PDM_RX3 overwritten
debugfs: File 'Capture' in directory 'dapm' already present!
adv7511 3-0039: failed to find dsi host
adv7511 3-0039: supply dvdd not found, using dummy regulator
adv7511 3-0039: supply pvdd not found, using dummy regulator
adv7511 3-0039: supply a2vdd not found, using dummy regulator
debugfs: Directory '7708000.audio-controller' with parent 'DB410c' 
already present!
qcom,pm8916-wcd-spmi-codec 200f000.spmi:pmic@1:audio-codec@f000: PMIC 
REV: 1      CODEC Version: 1
qcom,pm8916-wcd-spmi-codec 200f000.spmi:pmic@1:audio-codec@f000: ASoC: 
sink widget PDM_RX1 overwritten
qcom,pm8916-wcd-spmi-codec 200f000.spmi:pmic@1:audio-codec@f000: ASoC: 
source widget PDM_RX1 overwritten
qcom,pm8916-wcd-spmi-codec 200f000.spmi:pmic@1:audio-codec@f000: ASoC: 
source widget PDM_RX1 overwritten
qcom,pm8916-wcd-spmi-codec 200f000.spmi:pmic@1:audio-codec@f000: ASoC: 
sink widget PDM_RX1 overwritten
qcom,pm8916-wcd-spmi-codec 200f000.spmi:pmic@1:audio-codec@f000: ASoC: 
sink widget PDM_RX1 overwritten
qcom,pm8916-wcd-spmi-codec 200f000.spmi:pmic@1:audio-codec@f000: ASoC: 
sink widget ADC1 overwritten
qcom,pm8916-wcd-spmi-codec 200f000.spmi:pmic@1:audio-codec@f000: ASoC: 
sink widget ADC1 overwritten
qcom,pm8916-wcd-spmi-codec 200f000.spmi:pmic@1:audio-codec@f000: ASoC: 
sink widget PDM_RX1 overwritten
qcom,pm8916-wcd-spmi-codec 200f000.spmi:pmic@1:audio-codec@f000: ASoC: 
source widget PDM_RX3 overwritten
debugfs: File 'Capture' in directory 'dapm' already present!
adv7511 3-0039: failed to find dsi host
adv7511 3-0039: supply dvdd not found, using dummy regulator
adv7511 3-0039: supply pvdd not found, using dummy regulator
adv7511 3-0039: supply a2vdd not found, using dummy regulator
debugfs: Directory '7708000.audio-controller' with parent 'DB410c' 
already present!
qcom,pm8916-wcd-spmi-codec 200f000.spmi:pmic@1:audio-codec@f000: PMIC 
REV: 1      CODEC Version: 1
qcom,pm8916-wcd-spmi-codec 200f000.spmi:pmic@1:audio-codec@f000: ASoC: 
sink widget PDM_RX1 overwritten
qcom,pm8916-wcd-spmi-codec 200f000.spmi:pmic@1:audio-codec@f000: ASoC: 
source widget PDM_RX1 overwritten
qcom,pm8916-wcd-spmi-codec 200f000.spmi:pmic@1:audio-codec@f000: ASoC: 
source widget PDM_RX1 overwritten
qcom,pm8916-wcd-spmi-codec 200f000.spmi:pmic@1:audio-codec@f000: ASoC: 
sink widget PDM_RX1 overwritten
qcom,pm8916-wcd-spmi-codec 200f000.spmi:pmic@1:audio-codec@f000: ASoC: 
sink widget PDM_RX1 overwritten
qcom,pm8916-wcd-spmi-codec 200f000.spmi:pmic@1:audio-codec@f000: ASoC: 
sink widget ADC1 overwritten
qcom,pm8916-wcd-spmi-codec 200f000.spmi:pmic@1:audio-codec@f000: ASoC: 
sink widget ADC1 overwritten
qcom,pm8916-wcd-spmi-codec 200f000.spmi:pmic@1:audio-codec@f000: ASoC: 
sink widget PDM_RX1 overwritten
qcom,pm8916-wcd-spmi-codec 200f000.spmi:pmic@1:audio-codec@f000: ASoC: 
source widget PDM_RX3 overwritten
debugfs: File 'Capture' in directory 'dapm' already present!
adv7511 3-0039: failed to find dsi host
adv7511 3-0039: supply dvdd not found, using dummy regulator
adv7511 3-0039: supply pvdd not found, using dummy regulator
adv7511 3-0039: supply a2vdd not found, using dummy regulator
debugfs: Directory '7708000.audio-controller' with parent 'DB410c' 
already present!

...

Reverting it on top of linux next-20211028 'fixes' this issue.

> ---
>   drivers/gpu/drm/bridge/adv7511/adv7511_drv.c | 13 ++++++++++---
>   1 file changed, 10 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/gpu/drm/bridge/adv7511/adv7511_drv.c b/drivers/gpu/drm/bridge/adv7511/adv7511_drv.c
> index 9e3585f23cf1..f8e5da148599 100644
> --- a/drivers/gpu/drm/bridge/adv7511/adv7511_drv.c
> +++ b/drivers/gpu/drm/bridge/adv7511/adv7511_drv.c
> @@ -910,9 +910,6 @@ static int adv7511_bridge_attach(struct drm_bridge *bridge,
>   			return ret;
>   	}
>   
> -	if (adv->type == ADV7533 || adv->type == ADV7535)
> -		ret = adv7533_attach_dsi(adv);
> -
>   	if (adv->i2c_main->irq)
>   		regmap_write(adv->regmap, ADV7511_REG_INT_ENABLE(0),
>   			     ADV7511_INT0_HPD);
> @@ -1288,8 +1285,18 @@ static int adv7511_probe(struct i2c_client *i2c, const struct i2c_device_id *id)
>   	drm_bridge_add(&adv7511->bridge);
>   
>   	adv7511_audio_init(dev, adv7511);
> +
> +	if (adv7511->type == ADV7533 || adv7511->type == ADV7535) {
> +		ret = adv7533_attach_dsi(adv7511);
> +		if (ret)
> +			goto err_unregister_audio;
> +	}
> +
>   	return 0;
>   
> +err_unregister_audio:
> +	adv7511_audio_exit(adv7511);
> +	drm_bridge_remove(&adv7511->bridge);
>   err_unregister_cec:
>   	i2c_unregister_device(adv7511->i2c_cec);
>   	clk_disable_unprepare(adv7511->cec_clk);

Best regards
-- 
Marek Szyprowski, PhD
Samsung R&D Institute Poland