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Subject: Re: [resend PATCH v6 04/12] drm: mediatek: Omit warning on probe
 defers
To:     Enric Balletbo i Serra <enric.balletbo@collabora.com>,
        matthias.bgg@kernel.org, robh+dt@kernel.org, mark.rutland@arm.com,
        ck.hu@mediatek.com, p.zabel@pengutronix.de, airlied@linux.ie,
        mturquette@baylibre.com, sboyd@kernel.org,
        ulrich.hecht+renesas@gmail.com, laurent.pinchart@ideasonboard.com
Cc:     sean.wang@mediatek.com, sean.wang@kernel.org,
        rdunlap@infradead.org, wens@csie.org, hsinyi@chromium.org,
        frank-w@public-files.de, drinkcat@chromium.org,
        linux-media@vger.kernel.org, dri-devel@lists.freedesktop.org,
        linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
        linux-mediatek@lists.infradead.org, linux-clk@vger.kernel.org,
        devicetree@vger.kernel.org, mbrugger@suse.com
References: <20191207224740.24536-1-matthias.bgg@kernel.org>
 <20191207224740.24536-5-matthias.bgg@kernel.org>
 <48f9ec0c-1f1e-5a6c-283b-7efc4ce1bd5e@collabora.com>
From:   Matthias Brugger <matthias.bgg@gmail.com>
Autocrypt: addr=matthias.bgg@gmail.com; prefer-encrypt=mutual; keydata=
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Date:   Thu, 13 Feb 2020 19:58:16 +0100
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On 09/12/2019 10:39, Enric Balletbo i Serra wrote:
> Hi Matthias,
> 
> On 7/12/19 23:47, matthias.bgg@kernel.org wrote:
>> From: Matthias Brugger <mbrugger@suse.com>
>>
>> It can happen that the mmsys clock drivers aren't probed before the
>> platform driver gets invoked. The platform driver used to print a warning
>> that the driver failed to get the clocks. Omit this error on
>> the defered probe path.
>>
>> Signed-off-by: Matthias Brugger <mbrugger@suse.com>
>> ---
>>  drivers/gpu/drm/mediatek/mtk_disp_color.c |  5 ++++-
>>  drivers/gpu/drm/mediatek/mtk_disp_ovl.c   |  5 ++++-
>>  drivers/gpu/drm/mediatek/mtk_disp_rdma.c  |  5 ++++-
>>  drivers/gpu/drm/mediatek/mtk_dpi.c        | 12 +++++++++---
>>  drivers/gpu/drm/mediatek/mtk_drm_ddp.c    |  4 +++-
>>  drivers/gpu/drm/mediatek/mtk_dsi.c        |  8 ++++++--
>>  drivers/gpu/drm/mediatek/mtk_hdmi.c       |  4 +++-
>>  7 files changed, 33 insertions(+), 10 deletions(-)
>>
>> diff --git a/drivers/gpu/drm/mediatek/mtk_disp_color.c b/drivers/gpu/drm/mediatek/mtk_disp_color.c
>> index 59de2a46aa49..8f0fc96ef7bc 100644
>> --- a/drivers/gpu/drm/mediatek/mtk_disp_color.c
>> +++ b/drivers/gpu/drm/mediatek/mtk_disp_color.c
>> @@ -118,7 +118,10 @@ static int mtk_disp_color_probe(struct platform_device *pdev)
>>  	ret = mtk_ddp_comp_init(dev, dev->of_node, &priv->ddp_comp, comp_id,
>>  				&mtk_disp_color_funcs);
>>  	if (ret) {
>> -		dev_err(dev, "Failed to initialize component: %d\n", ret);
>> +		if (ret != -EPROBE_DEFER)
>> +			dev_err(dev, "Failed to initialize component: %d\n",
>> +				ret);
>> +
>>  		return ret;
>>  	}
>>  
>> diff --git a/drivers/gpu/drm/mediatek/mtk_disp_ovl.c b/drivers/gpu/drm/mediatek/mtk_disp_ovl.c
>> index 21851756c579..7487b0182c05 100644
>> --- a/drivers/gpu/drm/mediatek/mtk_disp_ovl.c
>> +++ b/drivers/gpu/drm/mediatek/mtk_disp_ovl.c
>> @@ -285,7 +285,10 @@ static int mtk_disp_ovl_probe(struct platform_device *pdev)
>>  	ret = mtk_ddp_comp_init(dev, dev->of_node, &priv->ddp_comp, comp_id,
>>  				&mtk_disp_ovl_funcs);
>>  	if (ret) {
>> -		dev_err(dev, "Failed to initialize component: %d\n", ret);
>> +		if (ret != -EPROBE_DEFER)
>> +			dev_err(dev, "Failed to initialize component: %d\n",
>> +				ret);
>> +
>>  		return ret;
>>  	}
>>  
>> diff --git a/drivers/gpu/drm/mediatek/mtk_disp_rdma.c b/drivers/gpu/drm/mediatek/mtk_disp_rdma.c
>> index 405afef31407..835ea8f8dab9 100644
>> --- a/drivers/gpu/drm/mediatek/mtk_disp_rdma.c
>> +++ b/drivers/gpu/drm/mediatek/mtk_disp_rdma.c
>> @@ -287,7 +287,10 @@ static int mtk_disp_rdma_probe(struct platform_device *pdev)
>>  	ret = mtk_ddp_comp_init(dev, dev->of_node, &priv->ddp_comp, comp_id,
>>  				&mtk_disp_rdma_funcs);
>>  	if (ret) {
>> -		dev_err(dev, "Failed to initialize component: %d\n", ret);
>> +		if (ret != -EPROBE_DEFER)
>> +			dev_err(dev, "Failed to initialize component: %d\n",
>> +				ret);
>> +
>>  		return ret;
>>  	}
>>  
>> diff --git a/drivers/gpu/drm/mediatek/mtk_dpi.c b/drivers/gpu/drm/mediatek/mtk_dpi.c
>> index be6d95c5ff25..9ed32470ad02 100644
>> --- a/drivers/gpu/drm/mediatek/mtk_dpi.c
>> +++ b/drivers/gpu/drm/mediatek/mtk_dpi.c
>> @@ -700,21 +700,27 @@ static int mtk_dpi_probe(struct platform_device *pdev)
>>  	dpi->engine_clk = devm_clk_get(dev, "engine");
>>  	if (IS_ERR(dpi->engine_clk)) {
>>  		ret = PTR_ERR(dpi->engine_clk);
>> -		dev_err(dev, "Failed to get engine clock: %d\n", ret);
>> +		if (ret != -EPROBE_DEFER)
>> +			dev_err(dev, "Failed to get engine clock: %d\n", ret);
> 
> This is only to print an error and I think that devm_clk_get will print a
> warning if the clk is not found. I guess that you can just remove the dev_err
> print logic, here and below.
> 

I didn't follow all the paths, but at least devres_alloc in devm_clk_get isn't
able to alloc the memory, it will silently return -ENOMEM. So I think it is OK
to print an error message here.

Regards,
Matthias

> In case there is an optional clock you could use devm_clk_get_optional, not sure
> if there is any, though.
> 
>> +
>>  		return ret;
>>  	}
>>  
>>  	dpi->pixel_clk = devm_clk_get(dev, "pixel");
>>  	if (IS_ERR(dpi->pixel_clk)) {
>>  		ret = PTR_ERR(dpi->pixel_clk);
>> -		dev_err(dev, "Failed to get pixel clock: %d\n", ret);
>> +		if (ret != -EPROBE_DEFER)
>> +			dev_err(dev, "Failed to get pixel clock: %d\n", ret);
>> +
> 
> ditto
> 
>>  		return ret;
>>  	}
>>  
>>  	dpi->tvd_clk = devm_clk_get(dev, "pll");
>>  	if (IS_ERR(dpi->tvd_clk)) {
>>  		ret = PTR_ERR(dpi->tvd_clk);
>> -		dev_err(dev, "Failed to get tvdpll clock: %d\n", ret);
>> +		if (ret != -EPROBE_DEFER)
>> +			dev_err(dev, "Failed to get tvdpll clock: %d\n", ret);
>> +
> 
> ditto
> 
>>  		return ret;
>>  	}
>>  
>> diff --git a/drivers/gpu/drm/mediatek/mtk_drm_ddp.c b/drivers/gpu/drm/mediatek/mtk_drm_ddp.c
>> index b765181223e6..6054e2b675f9 100644
>> --- a/drivers/gpu/drm/mediatek/mtk_drm_ddp.c
>> +++ b/drivers/gpu/drm/mediatek/mtk_drm_ddp.c
>> @@ -558,7 +558,9 @@ static int mtk_ddp_probe(struct platform_device *pdev)
>>  
>>  	ddp->clk = devm_clk_get(dev, NULL);
>>  	if (IS_ERR(ddp->clk)) {
>> -		dev_err(dev, "Failed to get clock\n");
>> +		if (PTR_ERR(ddp->clk) != -EPROBE_DEFER)
>> +			dev_err(dev, "Failed to get clock\n");
>> +
> 
> ditto
> 
>>  		return PTR_ERR(ddp->clk);
>>  	}
>>  
>> diff --git a/drivers/gpu/drm/mediatek/mtk_dsi.c b/drivers/gpu/drm/mediatek/mtk_dsi.c
>> index 4332563df952..66d5b0fdd678 100644
>> --- a/drivers/gpu/drm/mediatek/mtk_dsi.c
>> +++ b/drivers/gpu/drm/mediatek/mtk_dsi.c
>> @@ -1110,14 +1110,18 @@ static int mtk_dsi_probe(struct platform_device *pdev)
>>  	dsi->engine_clk = devm_clk_get(dev, "engine");
>>  	if (IS_ERR(dsi->engine_clk)) {
>>  		ret = PTR_ERR(dsi->engine_clk);
>> -		dev_err(dev, "Failed to get engine clock: %d\n", ret);
>> +		if (ret != -EPROBE_DEFER)
>> +			dev_err(dev, "Failed to get engine clock: %d\n", ret);
>> +
> 
> ditto
> 
>>  		return ret;
>>  	}
>>  
>>  	dsi->digital_clk = devm_clk_get(dev, "digital");
>>  	if (IS_ERR(dsi->digital_clk)) {
>>  		ret = PTR_ERR(dsi->digital_clk);
>> -		dev_err(dev, "Failed to get digital clock: %d\n", ret);
>> +		if (ret != -EPROBE_DEFER)
>> +			dev_err(dev, "Failed to get digital clock: %d\n", ret);
>> +
> 
> ditto
> 
>>  		return ret;
>>  	}
>>  
>> diff --git a/drivers/gpu/drm/mediatek/mtk_hdmi.c b/drivers/gpu/drm/mediatek/mtk_hdmi.c
>> index ce91b61364eb..62f9ca2308ee 100644
>> --- a/drivers/gpu/drm/mediatek/mtk_hdmi.c
>> +++ b/drivers/gpu/drm/mediatek/mtk_hdmi.c
>> @@ -1447,7 +1447,9 @@ static int mtk_hdmi_dt_parse_pdata(struct mtk_hdmi *hdmi,
>>  
>>  	ret = mtk_hdmi_get_all_clk(hdmi, np);
>>  	if (ret) {
>> -		dev_err(dev, "Failed to get clocks: %d\n", ret);
>> +		if (ret != -EPROBE_DEFER)
>> +			dev_err(dev, "Failed to get clocks: %d\n", ret);
>> +
>>  		return ret;
>>  	}
>>  
>>