Re: [PATCH v2 3/4] drm/msm/dsi/phy: Do not overwite PHY_CMN_CLK_CFG1 when choosing bitclk source

[Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>]

On 03/02/2025 18:40, Dmitry Baryshkov wrote:
> On Mon, Feb 03, 2025 at 06:29:20PM +0100, Krzysztof Kozlowski wrote:
>> PHY_CMN_CLK_CFG1 register has four fields being used in the driver: DSI
>> clock divider, source of bitclk and two for enabling the DSI PHY PLL
>> clocks.
>>
>> dsi_7nm_set_usecase() sets only the source of bitclk, so should leave
>> all other bits untouched.  Use newly introduced
>> dsi_pll_cmn_clk_cfg1_update() to update respective bits without
>> overwriting the rest.
>>
>> Fixes: 1ef7c99d145c ("drm/msm/dsi: add support for 7nm DSI PHY/PLL")
>> Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
>> ---
>>  drivers/gpu/drm/msm/dsi/phy/dsi_phy_7nm.c | 3 +--
>>  1 file changed, 1 insertion(+), 2 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 e26f53f7cde8f0f6419a633f5d39784dc2e5bb98..926fd8e3330b2cdfc69d1e0e5d3930abae77b7d8 100644
>> --- a/drivers/gpu/drm/msm/dsi/phy/dsi_phy_7nm.c
>> +++ b/drivers/gpu/drm/msm/dsi/phy/dsi_phy_7nm.c
>> @@ -616,7 +616,6 @@ static int dsi_7nm_pll_restore_state(struct msm_dsi_phy *phy)
>>  static int dsi_7nm_set_usecase(struct msm_dsi_phy *phy)
>>  {
>>  	struct dsi_pll_7nm *pll_7nm = to_pll_7nm(phy->vco_hw);
>> -	void __iomem *base = phy->base;
>>  	u32 data = 0x0;	/* internal PLL */
>>  
>>  	DBG("DSI PLL%d", pll_7nm->phy->id);
>> @@ -635,7 +634,7 @@ static int dsi_7nm_set_usecase(struct msm_dsi_phy *phy)
>>  	}
>>  
>>  	/* set PLL src */
>> -	writel(data << 2, base + REG_DSI_7nm_PHY_CMN_CLK_CFG1);
>> +	dsi_pll_cmn_clk_cfg1_update(pll_7nm, GENMASK(3, 2), data << 2);
> 
> The mask is not defined, still.

Why would it be? That's old/existing code. Commit is doing only one
thing - fixing something. Not introducing some masks or defines and
changing hard-coded values into defines.

Best regards,
Krzysztof