linux-kernel - Re: [PATCH 2/3] drm/msm/dsi/phy: Protect PHY_CMN_CLK

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Message-ID: <7srflbpb72amuky33bv2etyuo2wcmrcmrlc6sknx37gzp6v6s2@qpxelvzoo6gd>
Date: Mon, 3 Feb 2025 16:35:42 +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 2/3] drm/msm/dsi/phy: Protect PHY_CMN_CLK_CFG1 against
 clock driver

On Mon, Feb 03, 2025 at 12:19:04PM +0100, Krzysztof Kozlowski wrote:
> On 31/01/2025 17:25, Dmitry Baryshkov wrote:
> >>  
> >> -static void dsi_pll_disable_global_clk(struct dsi_pll_7nm *pll)
> >> +static void dsi_pll_cmn_clk_cfg1_update(struct dsi_pll_7nm *pll, u32 mask,
> >> +					u32 val)
> >>  {
> >> +	unsigned long flags;
> >>  	u32 data;
> >>  
> >> +	spin_lock_irqsave(&pll->pclk_mux_lock, flags);
> >>  	data = readl(pll->phy->base + REG_DSI_7nm_PHY_CMN_CLK_CFG1);
> >> -	writel(data & ~BIT(5), pll->phy->base + REG_DSI_7nm_PHY_CMN_CLK_CFG1);
> >> +	data &= ~mask;
> >> +	data |= val & mask;
> >> +
> >> +	writel(data, pll->phy->base + REG_DSI_7nm_PHY_CMN_CLK_CFG1);
> >> +	spin_unlock_irqrestore(&pll->pclk_mux_lock, flags);
> >> +}
> >> +
> >> +static void dsi_pll_disable_global_clk(struct dsi_pll_7nm *pll)
> >> +{
> >> +	dsi_pll_cmn_clk_cfg1_update(pll, BIT(5), 0);
> > 
> > PLease add these bits to the corresponding XML file (here and later on)
> 
> 
> I need some more input from you - I don't know which XML you talk about.
> Do you think about:
> drivers/gpu/drm/msm/registers/display/dsi_phy_7nm.xml

Yes

> and others alike? But doesn't it have only register offsets, not field
> offsets?

It can, see for example the mdp5.xml, you can add <bitfield> under the
<reg> node. Be sure to install python3-lxml and enable
CONFIG_DRM_MSM_VALIDATE_XML if you are modifying those files.

-- 
With best wishes
Dmitry