linux-kernel - Re: [PATCH v3 1/4] drm/mediatek: Move tz_disabled from mtk_hdmi_phy to mtk

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Message-ID: <ceae861b-b5ee-1d33-67dd-0a2ff4af2816@gmail.com>
Date:   Wed, 1 Apr 2020 17:53:26 +0200
From:   Matthias Brugger <matthias.bgg@...il.com>
To:     Chunfeng Yun <chunfeng.yun@...iatek.com>,
        Chun-Kuang Hu <chunkuang.hu@...nel.org>
Cc:     Philipp Zabel <p.zabel@...gutronix.de>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        Kishon Vijay Abraham I <kishon@...com>,
        linux-kernel@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        linux-mediatek@...ts.infradead.org, CK Hu <ck.hu@...iatek.com>
Subject: Re: [PATCH v3 1/4] drm/mediatek: Move tz_disabled from mtk_hdmi_phy
 to mtk_hdmi driver



On 01/04/2020 04:16, Chunfeng Yun wrote:
> On Tue, 2020-03-31 at 23:57 +0800, Chun-Kuang Hu wrote:
>> From: CK Hu <ck.hu@...iatek.com>
>>
>> tz_disabled is used to control mtk_hdmi output signal, but this variable
>> is stored in mtk_hdmi_phy and mtk_hdmi_phy does not use it. So move
>> tz_disabled to mtk_hdmi where it's used.
>>
>> Signed-off-by: CK Hu <ck.hu@...iatek.com>
>> Signed-off-by: Chun-Kuang Hu <chunkuang.hu@...nel.org>
>> ---
>>  drivers/gpu/drm/mediatek/mtk_hdmi.c           | 22 ++++++++++++++++---
>>  drivers/gpu/drm/mediatek/mtk_hdmi_phy.h       |  1 -
>>  .../gpu/drm/mediatek/mtk_mt2701_hdmi_phy.c    |  1 -
>>  3 files changed, 19 insertions(+), 5 deletions(-)
>>
>> diff --git a/drivers/gpu/drm/mediatek/mtk_hdmi.c b/drivers/gpu/drm/mediatek/mtk_hdmi.c
>> index 5e4a4dbda443..878433c09c9b 100644
>> --- a/drivers/gpu/drm/mediatek/mtk_hdmi.c
>> +++ b/drivers/gpu/drm/mediatek/mtk_hdmi.c
>> @@ -144,11 +144,16 @@ struct hdmi_audio_param {
>>  	struct hdmi_codec_params codec_params;
>>  };
>>  
>> +struct mtk_hdmi_conf {
>> +	bool tz_disabled;
>> +};
>> +
>>  struct mtk_hdmi {
>>  	struct drm_bridge bridge;
>>  	struct drm_bridge *next_bridge;
>>  	struct drm_connector conn;
>>  	struct device *dev;
>> +	const struct mtk_hdmi_conf *conf;
>>  	struct phy *phy;
>>  	struct device *cec_dev;
>>  	struct i2c_adapter *ddc_adpt;
>> @@ -230,7 +235,6 @@ static void mtk_hdmi_hw_vid_black(struct mtk_hdmi *hdmi, bool black)
>>  static void mtk_hdmi_hw_make_reg_writable(struct mtk_hdmi *hdmi, bool enable)
>>  {
>>  	struct arm_smccc_res res;
>> -	struct mtk_hdmi_phy *hdmi_phy = phy_get_drvdata(hdmi->phy);
>>  
>>  	/*
>>  	 * MT8173 HDMI hardware has an output control bit to enable/disable HDMI
>> @@ -238,7 +242,7 @@ static void mtk_hdmi_hw_make_reg_writable(struct mtk_hdmi *hdmi, bool enable)
>>  	 * The ARM trusted firmware provides an API for the HDMI driver to set
>>  	 * this control bit to enable HDMI output in supervisor mode.
>>  	 */
>> -	if (hdmi_phy->conf && hdmi_phy->conf->tz_disabled)
>> +	if (hdmi->conf->tz_disabled)

Wouldn't we need to check:
if (hdmi->conf && hdmi->conf->tz_disabled)

>>  		regmap_update_bits(hdmi->sys_regmap,
>>  				   hdmi->sys_offset + HDMI_SYS_CFG20,
>>  				   0x80008005, enable ? 0x80000005 : 0x8000);
>> @@ -1688,6 +1692,7 @@ static int mtk_drm_hdmi_probe(struct platform_device *pdev)
>>  		return -ENOMEM;
>>  
>>  	hdmi->dev = dev;
>> +	hdmi->conf = of_device_get_match_data(dev);
>>  
>>  	ret = mtk_hdmi_dt_parse_pdata(hdmi, pdev);
>>  	if (ret)
>> @@ -1765,8 +1770,19 @@ static int mtk_hdmi_resume(struct device *dev)
>>  static SIMPLE_DEV_PM_OPS(mtk_hdmi_pm_ops,
>>  			 mtk_hdmi_suspend, mtk_hdmi_resume);
>>  
>> +static const struct mtk_hdmi_conf mtk_hdmi_conf_mt2701 = {
>> +	.tz_disabled = true,
>> +};
>> +
>> +static const struct mtk_hdmi_conf mtk_hdmi_conf_mt8173;
>> +
>>  static const struct of_device_id mtk_drm_hdmi_of_ids[] = {
>> -	{ .compatible = "mediatek,mt8173-hdmi", },
>> +	{ .compatible = "mediatek,mt2701-hdmi",
>> +	  .data = &mtk_hdmi_conf_mt2701,
>> +	},
>> +	{ .compatible = "mediatek,mt8173-hdmi",
>> +	  .data = &mtk_hdmi_conf_mt8173,

We don't have any data? Then we should set data to NULL instead.

Regards,
Matthias

>> +	},
>>  	{}
>>  };
>>  
>> diff --git a/drivers/gpu/drm/mediatek/mtk_hdmi_phy.h b/drivers/gpu/drm/mediatek/mtk_hdmi_phy.h
>> index 2d8b3182470d..fc1c2efd1128 100644
>> --- a/drivers/gpu/drm/mediatek/mtk_hdmi_phy.h
>> +++ b/drivers/gpu/drm/mediatek/mtk_hdmi_phy.h
>> @@ -20,7 +20,6 @@
>>  struct mtk_hdmi_phy;
>>  
>>  struct mtk_hdmi_phy_conf {
>> -	bool tz_disabled;
>>  	unsigned long flags;
>>  	const struct clk_ops *hdmi_phy_clk_ops;
>>  	void (*hdmi_phy_enable_tmds)(struct mtk_hdmi_phy *hdmi_phy);
>> diff --git a/drivers/gpu/drm/mediatek/mtk_mt2701_hdmi_phy.c b/drivers/gpu/drm/mediatek/mtk_mt2701_hdmi_phy.c
>> index d3cc4022e988..99fe05cd3598 100644
>> --- a/drivers/gpu/drm/mediatek/mtk_mt2701_hdmi_phy.c
>> +++ b/drivers/gpu/drm/mediatek/mtk_mt2701_hdmi_phy.c
>> @@ -237,7 +237,6 @@ static void mtk_hdmi_phy_disable_tmds(struct mtk_hdmi_phy *hdmi_phy)
>>  }
>>  
>>  struct mtk_hdmi_phy_conf mtk_hdmi_phy_2701_conf = {
>> -	.tz_disabled = true,
>>  	.flags = CLK_SET_RATE_GATE,
>>  	.hdmi_phy_clk_ops = &mtk_hdmi_phy_pll_ops,
>>  	.hdmi_phy_enable_tmds = mtk_hdmi_phy_enable_tmds,
> 
> Reviewed-by: Chunfeng Yun <chunfeng.yun@...iatek.com>
>