linux-kernel - Re: [PATCH RFC] drm/msm/dsi/phy: Program clock inverters in correct register

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Message-ID: <kdnbhw2ng2kuhm2ynlmtxz4bnq6j243ktqwfvr4mgrr6w5uy7d@4j6cictf4tpu>
Date: Wed, 29 Jan 2025 16:31:03 +0200
From: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
To: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
Cc: Rob Clark <robdclark@...il.com>, 
	Abhinav Kumar <quic_abhinavk@...cinc.com>, Sean Paul <sean@...rly.run>, 
	Marijn Suijten <marijn.suijten@...ainline.org>, David Airlie <airlied@...il.com>, 
	Simona Vetter <simona@...ll.ch>, linux-arm-msm@...r.kernel.org, dri-devel@...ts.freedesktop.org, 
	freedreno@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH RFC] drm/msm/dsi/phy: Program clock inverters in correct
 register

On Wed, Jan 29, 2025 at 12:55:04PM +0100, Krzysztof Kozlowski wrote:
> Since SM8250 all downstream sources program clock inverters in
> PLL_CLOCK_INVERTERS_1 register and leave the PLL_CLOCK_INVERTERS as
> reset value (0x0).  The most recent Hardware Programming Guide for 3 nm,
> 4 nm, 5 nm and 7 nm PHYs also mention PLL_CLOCK_INVERTERS_1.
> 
> Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
> 
> ---
> 
> Not tested except my work-in-progress oon SM8750. Not sure what is the
> impact, so also no Fixes tag.

I'd say,

Fixes: 1ef7c99d145c ("drm/msm/dsi: add support for 7nm DSI PHY/PLL")
Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>

I didn't fully test this, but according to msm-4.14, msm-4.19 and
display drivers techpack this change is required on all 7nm- PHYs
(including the SM8150).

> ---
>  drivers/gpu/drm/msm/dsi/phy/dsi_phy_7nm.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> 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 7f6fb2a840d2..6646f8dbe457 100644
> --- a/drivers/gpu/drm/msm/dsi/phy/dsi_phy_7nm.c
> +++ b/drivers/gpu/drm/msm/dsi/phy/dsi_phy_7nm.c
> @@ -326,7 +326,7 @@ static void dsi_pll_commit(struct dsi_pll_7nm *pll, struct dsi_pll_config *confi
>  	writel(pll->phy->cphy_mode ? 0x00 : 0x10,
>  	       base + REG_DSI_7nm_PHY_PLL_CMODE_1);
>  	writel(config->pll_clock_inverters,
> -	       base + REG_DSI_7nm_PHY_PLL_CLOCK_INVERTERS);
> +	       base + REG_DSI_7nm_PHY_PLL_CLOCK_INVERTERS_1);
>  }
>  
>  static int dsi_pll_7nm_vco_set_rate(struct clk_hw *hw, unsigned long rate,
> -- 
> 2.43.0
> 

-- 
With best wishes
Dmitry