linux-kernel - Re: [PATCH v3 4/4] drm/msm/dsi/phy: Define PHY_CMN_CLK

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Message-ID: <0e3068a7-29be-47c8-ab6f-caecccf275fd@linaro.org>
Date: Mon, 17 Feb 2025 12:51:22 +0100
From: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To: Dmitry Baryshkov <dmitry.baryshkov@...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>,
 Jonathan Marek <jonathan@...ek.ca>, linux-arm-msm@...r.kernel.org,
 dri-devel@...ts.freedesktop.org, freedreno@...ts.freedesktop.org,
 linux-kernel@...r.kernel.org, Rob Clark <robdclark@...omium.org>
Subject: Re: [PATCH v3 4/4] drm/msm/dsi/phy: Define PHY_CMN_CLK_CFG[01]
 bitfields and simplify saving

On 14/02/2025 16:20, Dmitry Baryshkov wrote:
> On Fri, Feb 14, 2025 at 04:08:44PM +0100, Krzysztof Kozlowski wrote:
>> Add bitfields for PHY_CMN_CLK_CFG0 and PHY_CMN_CLK_CFG1 registers to
>> avoid hard-coding bit masks and shifts and make the code a bit more
>> readable.  While touching the lines in dsi_7nm_pll_save_state()
>> resulting cached->pix_clk_div assignment would be too big, so just
>> combine pix_clk_div and bit_clk_div into one cached state to make
>> everything simpler.
>>
>> Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
>>
>> ---
>>
>> Changes in v3:
>> 1. Use FIELD_GET
>> 2. Keep separate bit_clk_div and pix_clk_div
>> 3. Rebase (some things moved to previous patches)
>>
>> Changes in v2:
>> 1. New patch
>> ---
>>  drivers/gpu/drm/msm/dsi/phy/dsi_phy_7nm.c             | 12 +++++++-----
>>  drivers/gpu/drm/msm/registers/display/dsi_phy_7nm.xml |  1 +
>>  2 files changed, 8 insertions(+), 5 deletions(-)
>>
>> 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 798168180c1ab6c96ec2384f854302720cb27932..a8a5b41b63fb78348038c8f9fbb141aab2b07c7a 100644
>> --- a/drivers/gpu/drm/msm/dsi/phy/dsi_phy_7nm.c
>> +++ b/drivers/gpu/drm/msm/dsi/phy/dsi_phy_7nm.c
>> @@ -572,11 +572,11 @@ static void dsi_7nm_pll_save_state(struct msm_dsi_phy *phy)
>>  	cached->pll_out_div &= 0x3;
>>  
>>  	cmn_clk_cfg0 = readl(phy_base + REG_DSI_7nm_PHY_CMN_CLK_CFG0);
>> -	cached->bit_clk_div = cmn_clk_cfg0 & 0xf;
>> -	cached->pix_clk_div = (cmn_clk_cfg0 & 0xf0) >> 4;
>> +	cached->bit_clk_div = FIELD_GET(DSI_7nm_PHY_CMN_CLK_CFG0_DIV_CTRL_3_0__MASK, cmn_clk_cfg0);
>> +	cached->pix_clk_div = FIELD_GET(DSI_7nm_PHY_CMN_CLK_CFG0_DIV_CTRL_7_4__MASK, cmn_clk_cfg0);
>>  
>>  	cmn_clk_cfg1 = readl(phy_base + REG_DSI_7nm_PHY_CMN_CLK_CFG1);
>> -	cached->pll_mux = cmn_clk_cfg1 & 0x3;
>> +	cached->pll_mux = cmn_clk_cfg1 & DSI_7nm_PHY_CMN_CLK_CFG1_DSICLK_SEL__MASK;
> 
> FIELD_GET.

Ack

> 
>>  
>>  	DBG("DSI PLL%d outdiv %x bit_clk_div %x pix_clk_div %x pll_mux %x",
>>  	    pll_7nm->phy->id, cached->pll_out_div, cached->bit_clk_div,
>> @@ -598,7 +598,8 @@ static int dsi_7nm_pll_restore_state(struct msm_dsi_phy *phy)
>>  	dsi_pll_cmn_clk_cfg0_write(pll_7nm,
>>  				   DSI_7nm_PHY_CMN_CLK_CFG0_DIV_CTRL_3_0(cached->bit_clk_div) |
>>  				   DSI_7nm_PHY_CMN_CLK_CFG0_DIV_CTRL_7_4(cached->pix_clk_div));
>> -	dsi_pll_cmn_clk_cfg1_update(pll_7nm, 0x3, cached->pll_mux);
>> +	dsi_pll_cmn_clk_cfg1_update(pll_7nm, DSI_7nm_PHY_CMN_CLK_CFG1_DSICLK_SEL__MASK,
>> +				    cached->pll_mux);
> 
> DSI_7nm_PHY_CMN_CLK_CFG1_DSICLK_SEL(cached->pll_mux)
> 
>>  
>>  	ret = dsi_pll_7nm_vco_set_rate(phy->vco_hw,
>>  			pll_7nm->vco_current_rate,
>> @@ -739,7 +740,8 @@ static int pll_7nm_register(struct dsi_pll_7nm *pll_7nm, struct clk_hw **provide
>>  		u32 data;
>>  
>>  		data = readl(pll_7nm->phy->base + REG_DSI_7nm_PHY_CMN_CLK_CFG1);
>> -		writel(data | 3, pll_7nm->phy->base + REG_DSI_7nm_PHY_CMN_CLK_CFG1);
>> +		writel(data | DSI_7nm_PHY_CMN_CLK_CFG1_DSICLK_SEL__MASK,
> 
> data | DSI_7nm_PHY_CMN_CLK_CFG1_DSICLK_SEL(3)
Ack

Best regards,
Krzysztof