linux-kernel - Re: [PATCH] drm/mediatek: mtk_hdmi: fix inverted parameters in some regmap_update

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Message-ID: <a4538873bba257529435b28ff65dab85703b13be.camel@mediatek.com>
Date: Wed, 20 Aug 2025 02:37:44 +0000
From: CK Hu (胡俊光) <ck.hu@...iatek.com>
To: "granquet@...libre.com" <granquet@...libre.com>, "chunkuang.hu@...nel.org"
	<chunkuang.hu@...nel.org>, "simona@...ll.ch" <simona@...ll.ch>,
	AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>,
	"airlied@...il.com" <airlied@...il.com>, "p.zabel@...gutronix.de"
	<p.zabel@...gutronix.de>, "matthias.bgg@...il.com" <matthias.bgg@...il.com>,
	Louis-Alexis Eyraud <louisalexis.eyraud@...labora.com>
CC: "dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>,
	"linux-mediatek@...ts.infradead.org" <linux-mediatek@...ts.infradead.org>,
	"linux-arm-kernel@...ts.infradead.org"
	<linux-arm-kernel@...ts.infradead.org>, "kernel@...labora.com"
	<kernel@...labora.com>, "linux-kernel@...r.kernel.org"
	<linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] drm/mediatek: mtk_hdmi: fix inverted parameters in some
 regmap_update_bits calls

On Mon, 2025-08-18 at 16:17 +0200, Louis-Alexis Eyraud wrote:
> External email : Please do not click links or open attachments until you have verified the sender or the content.
> 
> 
> In mtk_hdmi driver, a recent change replaced custom register access
> function calls by regmap ones, but two replacements by regmap_update_bits
> were done incorrectly, because original offset and mask parameters were
> inverted, so fix them.

Reviewed-by: CK Hu <ck.hu@...iatek.com>

> 
> Fixes: d6e25b3590a0 ("drm/mediatek: hdmi: Use regmap instead of iomem for main registers")
> Signed-off-by: Louis-Alexis Eyraud <louisalexis.eyraud@...labora.com>
> ---
>  drivers/gpu/drm/mediatek/mtk_hdmi.c | 8 ++++----
>  1 file changed, 4 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/gpu/drm/mediatek/mtk_hdmi.c b/drivers/gpu/drm/mediatek/mtk_hdmi.c
> index 845fd8aa43c3c91659808d9e6bb78758d1f9b857..b766dd5e6c8de6d16bff50972b45c3c1a083b985 100644
> --- a/drivers/gpu/drm/mediatek/mtk_hdmi.c
> +++ b/drivers/gpu/drm/mediatek/mtk_hdmi.c
> @@ -182,8 +182,8 @@ static inline struct mtk_hdmi *hdmi_ctx_from_bridge(struct drm_bridge *b)
> 
>  static void mtk_hdmi_hw_vid_black(struct mtk_hdmi *hdmi, bool black)
>  {
> -       regmap_update_bits(hdmi->regs, VIDEO_SOURCE_SEL,
> -                          VIDEO_CFG_4, black ? GEN_RGB : NORMAL_PATH);
> +       regmap_update_bits(hdmi->regs, VIDEO_CFG_4,
> +                          VIDEO_SOURCE_SEL, black ? GEN_RGB : NORMAL_PATH);
>  }
> 
>  static void mtk_hdmi_hw_make_reg_writable(struct mtk_hdmi *hdmi, bool enable)
> @@ -310,8 +310,8 @@ static void mtk_hdmi_hw_send_info_frame(struct mtk_hdmi *hdmi, u8 *buffer,
> 
>  static void mtk_hdmi_hw_send_aud_packet(struct mtk_hdmi *hdmi, bool enable)
>  {
> -       regmap_update_bits(hdmi->regs, AUDIO_PACKET_OFF,
> -                          GRL_SHIFT_R2, enable ? 0 : AUDIO_PACKET_OFF);
> +       regmap_update_bits(hdmi->regs, GRL_SHIFT_R2,
> +                          AUDIO_PACKET_OFF, enable ? 0 : AUDIO_PACKET_OFF);
>  }
> 
>  static void mtk_hdmi_hw_config_sys(struct mtk_hdmi *hdmi)
> 
> ---
> base-commit: afb39542bbf14acf910012eee2d4159add05d384
> change-id: 20250818-mt8173-fix-hdmi-issue-287cf353b077
> 
> Best regards,
> --
> Louis-Alexis Eyraud <louisalexis.eyraud@...labora.com>
>