linux-kernel - Re: [PATCH v2] drm/msm/dsi: use the correct VREG_CTRL

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Message-ID: <01b9bc3f-2afb-bd33-1212-d1dc7999b2bc@quicinc.com>
Date:   Thu, 16 Nov 2023 12:36:38 -0800
From:   Abhinav Kumar <quic_abhinavk@...cinc.com>
To:     Jonathan Marek <jonathan@...ek.ca>,
        <freedreno@...ts.freedesktop.org>
CC:     Rob Clark <robdclark@...il.com>,
        Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
        Sean Paul <sean@...rly.run>,
        Marijn Suijten <marijn.suijten@...ainline.org>,
        David Airlie <airlied@...il.com>,
        Daniel Vetter <daniel@...ll.ch>,
        Konrad Dybcio <konrad.dybcio@...ainline.org>,
        Vinod Koul <vkoul@...nel.org>, Robert Foss <rfoss@...nel.org>,
        Neil Armstrong <neil.armstrong@...aro.org>,
        "open list:DRM DRIVER FOR MSM ADRENO GPU" 
        <linux-arm-msm@...r.kernel.org>,
        "open list:DRM DRIVER FOR MSM ADRENO GPU" 
        <dri-devel@...ts.freedesktop.org>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2] drm/msm/dsi: use the correct VREG_CTRL_1 value for 4nm
 cphy



On 11/9/2023 4:02 PM, Jonathan Marek wrote:
> Use the same value as the downstream driver. This change is needed for CPHY
> mode to work correctly.
> 
> Fixes: 8b034e6771113 ("drm/msm/dsi: add support for DSI-PHY on SM8550")
> Signed-off-by: Jonathan Marek <jonathan@...ek.ca>
> ---
> v2: fixed the Fixes: line
> 
>   drivers/gpu/drm/msm/dsi/phy/dsi_phy_7nm.c | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
> 

Good catch !

LGTM

Reviewed-by: Abhinav Kumar <quic_abhinavk@...cinc.com>

> diff --git a/drivers/gpu/drm/msm/dsi/phy/dsi_phy_7nm.c b/drivers/gpu/drm/msm/dsi/phy/dsi_phy_7nm.c
> index 3b1ed02f644d..89a6344bc865 100644
> --- a/drivers/gpu/drm/msm/dsi/phy/dsi_phy_7nm.c
> +++ b/drivers/gpu/drm/msm/dsi/phy/dsi_phy_7nm.c
> @@ -918,7 +918,7 @@ static int dsi_7nm_phy_enable(struct msm_dsi_phy *phy,
>   	if ((phy->cfg->quirks & DSI_PHY_7NM_QUIRK_V5_2)) {
>   		if (phy->cphy_mode) {
>   			vreg_ctrl_0 = 0x45;
> -			vreg_ctrl_1 = 0x45;
> +			vreg_ctrl_1 = 0x41;
>   			glbl_rescode_top_ctrl = 0x00;
>   			glbl_rescode_bot_ctrl = 0x00;
>   		} else {