linux-kernel - Re: [PATCH v4 5/8] drm/mediatek: hdmi: add v2 support

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Date:   Tue, 13 Jun 2023 01:52:47 +0000
From:   CK Hu (胡俊光) <ck.hu@...iatek.com>
To:     "robh+dt@...nel.org" <robh+dt@...nel.org>,
        "kishon@...com" <kishon@...com>,
        Chunfeng Yun (云春峰) 
        <Chunfeng.Yun@...iatek.com>,
        "chunkuang.hu@...nel.org" <chunkuang.hu@...nel.org>,
        Jitao Shi (石记涛) <jitao.shi@...iatek.com>,
        "daniel@...ll.ch" <daniel@...ll.ch>,
        "granquet@...libre.com" <granquet@...libre.com>,
        "p.zabel@...gutronix.de" <p.zabel@...gutronix.de>,
        "airlied@...il.com" <airlied@...il.com>,
        "krzysztof.kozlowski+dt@...aro.org" 
        <krzysztof.kozlowski+dt@...aro.org>,
        "vkoul@...nel.org" <vkoul@...nel.org>,
        "matthias.bgg@...il.com" <matthias.bgg@...il.com>
CC:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-mediatek@...ts.infradead.org" 
        <linux-mediatek@...ts.infradead.org>,
        Mac Shen (沈俊) <Mac.Shen@...iatek.com>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "krzysztof.kozlowski@...aro.org" <krzysztof.kozlowski@...aro.org>,
        Stuart Lee (李翰) <Stuart.Lee@...iatek.com>,
        "dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "angelogioacchino.delregno@...labora.com" 
        <angelogioacchino.delregno@...labora.com>
Subject: Re: [PATCH v4 5/8] drm/mediatek: hdmi: add v2 support

Hi, Guillaume:

On Mon, 2023-05-29 at 16:31 +0200, Guillaume Ranquet wrote:
>  	 
> External email : Please do not click links or open attachments until
> you have verified the sender or the content.
>  Adds hdmi and hdmi-ddc support for v2 IP.
> 
> Signed-off-by: Guillaume Ranquet <granquet@...libre.com>
> 

[snip]

> +
> +static unsigned char vddc_read(struct mtk_hdmi_ddc *ddc, unsigned
> int u4_clk_div,
> +       unsigned char uc_dev, unsigned int u4_addr,
> +       enum sif_bit_t_hdmi uc_addr_type,
> +       unsigned char *puc_value, unsigned int u4_count)
> +{
> +unsigned int u4_read_count = 0;
> +unsigned char uc_return_value = 0;
> +
> +if (!puc_value || !u4_count || !u4_clk_div ||
> +    uc_addr_type > SIF_16_BIT_HDMI ||
> +    (uc_addr_type == SIF_8_BIT_HDMI && u4_addr > 255) ||
> +    (uc_addr_type == SIF_16_BIT_HDMI && u4_addr > 65535)) {

uc_addr_type would never be SIF_16_BIT_HDMI, so remove SIF_16_BIT_HDMI.

Regards,
CK

> +return 0;
> +}
> +
> +if (uc_addr_type == SIF_8_BIT_HDMI)
> +u4_read_count = 255 - u4_addr + 1;
> +else if (uc_addr_type == SIF_16_BIT_HDMI)
> +u4_read_count = 65535 - u4_addr + 1;
> +
> +u4_read_count = (u4_read_count > u4_count) ? u4_count :
> u4_read_count;
> +uc_return_value = ddcm_read_hdmi(ddc, u4_clk_div, uc_dev, u4_addr,
> + uc_addr_type, puc_value, u4_read_count);
> +return uc_return_value;
> +}
> +
> +static bool fg_ddc_data_read(struct mtk_hdmi_ddc *ddc,
> +      unsigned char b_dev,
> +      unsigned char b_data_addr,
> +      unsigned char b_data_count,
> +      unsigned char *pr_data)
> +{
> +int ret;
> +
> +mutex_lock(&ddc->mtx);
> +
> +hdmi_ddc_request(ddc);
> +ret = vddc_read(ddc, DDC2_CLOK, b_dev, b_data_addr, SIF_8_BIT_HDMI,
> +      pr_data, b_data_count);
> +mutex_unlock(&ddc->mtx);
> +
> +return ret == b_data_count;
> +}
> +

>