linux-kernel - Re: [PATCH v3 03/12] drm/mediatek: hdmi: use a regmap instead of iomem

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Date:   Mon, 7 Nov 2022 14:43:58 +0000
From:   Guillaume Ranquet <granquet@...libre.com>
To:     AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>,
        Kishon Vijay Abraham I <kishon@...com>,
        Rob Herring <robh+dt@...nel.org>,
        Chun-Kuang Hu <chunkuang.hu@...nel.org>,
        Chunfeng Yun <chunfeng.yun@...iatek.com>,
        Jitao shi <jitao.shi@...iatek.com>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Vinod Koul <vkoul@...nel.org>, CK Hu <ck.hu@...iatek.com>,
        Daniel Vetter <daniel@...ll.ch>,
        David Airlie <airlied@...il.com>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Philipp Zabel <p.zabel@...gutronix.de>
Cc:     Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
        linux-arm-kernel@...ts.infradead.org, stuart.lee@...iatek.com,
        linux-kernel@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        linux-mediatek@...ts.infradead.org, devicetree@...r.kernel.org,
        mac.shen@...iatek.com, linux-phy@...ts.infradead.org
Subject: Re: [PATCH v3 03/12] drm/mediatek: hdmi: use a regmap instead of iomem

On Mon, 07 Nov 2022 12:20, AngeloGioacchino Del Regno
<angelogioacchino.delregno@...labora.com> wrote:
>Il 04/11/22 15:09, Guillaume Ranquet ha scritto:
>> To prepare support for newer chips that need to share their address
>> range with a dedicated ddc driver, use a regmap.
>>
>> Signed-off-by: Guillaume Ranquet <granquet@...libre.com>
>> ---
>>   drivers/gpu/drm/mediatek/mtk_hdmi.c | 43 +++++++++++--------------------------
>>   1 file changed, 13 insertions(+), 30 deletions(-)
>>
>> diff --git a/drivers/gpu/drm/mediatek/mtk_hdmi.c b/drivers/gpu/drm/mediatek/mtk_hdmi.c
>> index 4c80b6896dc3..9b02b30a193a 100644
>> --- a/drivers/gpu/drm/mediatek/mtk_hdmi.c
>> +++ b/drivers/gpu/drm/mediatek/mtk_hdmi.c
>> @@ -171,7 +171,7 @@ struct mtk_hdmi {
>>   	u32 ibias_up;
>>   	struct regmap *sys_regmap;
>>   	unsigned int sys_offset;
>> -	void __iomem *regs;
>> +	struct regmap *regs;
>>   	enum hdmi_colorspace csp;
>>   	struct hdmi_audio_param aud_param;
>>   	bool audio_enable;
>> @@ -187,44 +187,29 @@ static inline struct mtk_hdmi *hdmi_ctx_from_bridge(struct drm_bridge *b)
>>   	return container_of(b, struct mtk_hdmi, bridge);
>>   }
>>
>> -static u32 mtk_hdmi_read(struct mtk_hdmi *hdmi, u32 offset)
>> +static int mtk_hdmi_read(struct mtk_hdmi *hdmi, u32 offset, u32 *val)
>>   {
>> -	return readl(hdmi->regs + offset);
>> +	return regmap_read(hdmi->regs, offset, val);
>>   }
>>
>>   static void mtk_hdmi_write(struct mtk_hdmi *hdmi, u32 offset, u32 val)
>>   {
>> -	writel(val, hdmi->regs + offset);
>> +	regmap_write(hdmi->regs, offset, val);
>>   }
>>
>>   static void mtk_hdmi_clear_bits(struct mtk_hdmi *hdmi, u32 offset, u32 bits)
>
>You don't need these functions anymore, as these are now simply wrapping
>regmap calls, hence these don't contain any "real" logic anymore.
>
>Please remove them and use the regmap API directly.
>
>Thanks,
>Angelo
>

Agree with that, my intent was to minimize the change size so that it
would be easy to review.

My mistake, I'll remove the wrappers.

Thx,
Guillaume.