Re: [RESEND2,v4,2/2] drm/meson: dw-hdmi: Use devm_regulator_*get_enable*()

From: Neil Armstrong <neil.armstrong@linaro.org>
To: Marek Szyprowski <m.szyprowski@samsung.com>,
	Matti Vaittinen <mazziesaccount@gmail.com>,
	Matti Vaittinen <matti.vaittinen@fi.rohmeurope.com>
Cc: Martin Blumenstingl <martin.blumenstingl@googlemail.com>,
	Kevin Hilman <khilman@baylibre.com>,
	Liam Girdwood <lgirdwood@gmail.com>,
	dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org,
	Mark Brown <broonie@kernel.org>,
	linux-amlogic@lists.infradead.org,
	linux-arm-kernel@lists.infradead.org,
	Jerome Brunet <jbrunet@baylibre.com>
Subject: Re: [RESEND2,v4,2/2] drm/meson: dw-hdmi: Use devm_regulator_*get_enable*()
Date: Mon, 9 Jan 2023 16:23:51 +0100	[thread overview]
Message-ID: <0ef85cba-fa9b-6d72-ca44-48c4d6cf2752@linaro.org> (raw)
In-Reply-To: <6c865dd8-b6c3-4491-48ca-df3e3fa45a2d@samsung.com>

On 09/01/2023 14:46, Marek Szyprowski wrote:
> Hi Matti,
> 
> On 30.11.2022 10:23, Matti Vaittinen wrote:
>> Simplify using the devm_regulator_get_enable_optional(). Also drop the
>> now unused struct member 'hdmi_supply'.
>>
>> Signed-off-by: Matti Vaittinen <mazziesaccount@gmail.com>
>> Martin Blumenstingl <martin.blumenstingl@googlemail.com>
>> ---
>> v4 resend 2:
>> Respinning unchanged code with the commit title changed as wa suggested
>> by Robert Foss and commit message changed as was suggested by Martin.
>>
>> I am doing a clean-up for my local git and encountered this one.
>> Respinning as it seems this one fell through the cracks.
>> ---
>>    drivers/gpu/drm/meson/meson_dw_hdmi.c | 23 +++--------------------
>>    1 file changed, 3 insertions(+), 20 deletions(-)
>>
>> diff --git a/drivers/gpu/drm/meson/meson_dw_hdmi.c b/drivers/gpu/drm/meson/meson_dw_hdmi.c
>> index 5cd2b2ebbbd3..7642f740272b 100644
>> --- a/drivers/gpu/drm/meson/meson_dw_hdmi.c
>> +++ b/drivers/gpu/drm/meson/meson_dw_hdmi.c
>> @@ -140,7 +140,6 @@ struct meson_dw_hdmi {
>>    	struct reset_control *hdmitx_apb;
>>    	struct reset_control *hdmitx_ctrl;
>>    	struct reset_control *hdmitx_phy;
>> -	struct regulator *hdmi_supply;
>>    	u32 irq_stat;
>>    	struct dw_hdmi *hdmi;
>>    	struct drm_bridge *bridge;
>> @@ -665,11 +664,6 @@ static void meson_dw_hdmi_init(struct meson_dw_hdmi *meson_dw_hdmi)
>>    
>>    }
>>    
>> -static void meson_disable_regulator(void *data)
>> -{
>> -	regulator_disable(data);
>> -}
>> -
>>    static void meson_disable_clk(void *data)
>>    {
>>    	clk_disable_unprepare(data);
>> @@ -723,20 +717,9 @@ static int meson_dw_hdmi_bind(struct device *dev, struct device *master,
>>    	meson_dw_hdmi->data = match;
>>    	dw_plat_data = &meson_dw_hdmi->dw_plat_data;
>>    
>> -	meson_dw_hdmi->hdmi_supply = devm_regulator_get_optional(dev, "hdmi");
>> -	if (IS_ERR(meson_dw_hdmi->hdmi_supply)) {
>> -		if (PTR_ERR(meson_dw_hdmi->hdmi_supply) == -EPROBE_DEFER)
>> -			return -EPROBE_DEFER;
>> -		meson_dw_hdmi->hdmi_supply = NULL;
>> -	} else {
>> -		ret = regulator_enable(meson_dw_hdmi->hdmi_supply);
>> -		if (ret)
>> -			return ret;
>> -		ret = devm_add_action_or_reset(dev, meson_disable_regulator,
>> -					       meson_dw_hdmi->hdmi_supply);
>> -		if (ret)
>> -			return ret;
>> -	}
>> +	ret = devm_regulator_get_enable_optional(dev, "hdmi");
>> +	if (ret != -ENODEV)
> 
> The above line should be "if (ret < 0)", otherwise it breaks hdmi support.
> 
> I've noticed this once this change has been merged to linux-next and all
> my Amlogic Meson based boards failed to initialize HDMI. Is it possible
> to fix this in drm tree or do I need to send the incremental fixup?

Nop, please send an incremental fix and I'll apply it asap.

Thanks,
Neil

> 
>> +		return ret;
>>    
>>    	meson_dw_hdmi->hdmitx_apb = devm_reset_control_get_exclusive(dev,
>>    						"hdmitx_apb");
> 
> Best regards

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