linux-kernel - Re: [PATCH] phy: mediatek/mt8195: fx mtk_hdmi_pll

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Date:   Tue, 18 Apr 2023 20:06:24 +0200
From:   Matthias Brugger <matthias.bgg@...il.com>
To:     Arnd Bergmann <arnd@...nel.org>,
        Chun-Kuang Hu <chunkuang.hu@...nel.org>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        Chunfeng Yun <chunfeng.yun@...iatek.com>,
        Vinod Koul <vkoul@...nel.org>,
        Kishon Vijay Abraham I <kishon@...nel.org>,
        AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>,
        Guillaume Ranquet <granquet@...libre.com>
Cc:     Arnd Bergmann <arnd@...db.de>, dri-devel@...ts.freedesktop.org,
        linux-mediatek@...ts.infradead.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-phy@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] phy: mediatek/mt8195: fx mtk_hdmi_pll_calc() return code

Hi Arnd,

On 14/04/2023 09:58, Arnd Bergmann wrote:
> From: Arnd Bergmann <arnd@...db.de>
> 
> The newly added function returns an uninitialized variable:
> 
> drivers/phy/mediatek/phy-mtk-hdmi-mt8195.c:298:6: error: variable 'ret' is uninitialized when used here [-Werror,-Wuninitialized]
> 
> Wire it up to the return code of the function called just before,
> assuming that this was the intention originally.
> 
> Fixes: 45810d486bb4 ("phy: mediatek: add support for phy-mtk-hdmi-mt8195")
> Signed-off-by: Arnd Bergmann <arnd@...db.de>
> ---
>   drivers/phy/mediatek/phy-mtk-hdmi-mt8195.c | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/phy/mediatek/phy-mtk-hdmi-mt8195.c b/drivers/phy/mediatek/phy-mtk-hdmi-mt8195.c
> index abfc077fb0a8..c8e540665fcb 100644
> --- a/drivers/phy/mediatek/phy-mtk-hdmi-mt8195.c
> +++ b/drivers/phy/mediatek/phy-mtk-hdmi-mt8195.c
> @@ -292,7 +292,7 @@ static int mtk_hdmi_pll_calc(struct mtk_hdmi_phy *hdmi_phy, struct clk_hw *hw,
>   	if (!(digital_div <= 32 && digital_div >= 1))
>   		return -EINVAL;
>   
> -	mtk_hdmi_pll_set_hw(hw, PLL_PREDIV, fbkdiv_high, fbkdiv_low,
> +	ret = mtk_hdmi_pll_set_hw(hw, PLL_PREDIV, fbkdiv_high, fbkdiv_low,
>   			    PLL_FBKDIV_HS3, posdiv1, posdiv2, txprediv,
>   			    txposdiv, digital_div);
>   	if (ret)

I think this is the third patch that fixes this :) Your solution look quite 
similar to this one:
20230413-fixes-for-mt8195-hdmi-phy-v2-1-bbad62e64321@...libre.com

Regards,
Mmatthias