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Date:   Mon, 14 Dec 2020 01:35:37 +0000
From:   André Przywara <andre.przywara@....com>
To:     Icenowy Zheng <icenowy@...c.io>,
        Maxime Ripard <mripard@...nel.org>,
        Chen-Yu Tsai <wens@...e.org>,
        Jernej Skrabec <jernej.skrabec@...l.net>
Cc:     Icenowy Zheng <icenowy@...c.xyz>,
        Linus Walleij <linus.walleij@...aro.org>,
        Rob Herring <robh@...nel.org>,
        Clément Péron <peron.clem@...il.com>,
        Shuosheng Huang <huangshuosheng@...winnertech.com>,
        Yangtao Li <tiny.windzz@...il.com>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-sunxi@...glegroups.com,
        Kishon Vijay Abraham I <kishon@...com>,
        Vinod Koul <vkoul@...nel.org>
Subject: Re: [PATCH v2 14/21] phy: sun4i-usb: Rework "pmu_unk1" handling

On 13/12/2020 18:24, Icenowy Zheng wrote:
> 在 2020-12-11星期五的 01:19 +0000,Andre Przywara写道:
>> Newer SoCs (A100, H616) need to clear a different bit in our
>> "unknown"
>> PMU PHY register.
> 
> It looks like that the unknown PHY register is PHYCTL register for each
> individual PHY, and the bit that is cleared is
> called SUNXI_HCI_PHY_CTRL_SIDDQ in the BSP (similar to
> the USBC_PHY_CTL_SIDDQ we cleared for main PHYCTL).

Oh, right, somehow I failed to find this in the BSP, I guess I got
confused over that similar symbol. I will put proper names to it.

Thanks!
Andre

>>
>> Generalise the existing code by allowing configs to specify a bitmask
>> of bits to clear.
>>
>> Signed-off-by: Andre Przywara <andre.przywara@....com>
>> ---
>>  drivers/phy/allwinner/phy-sun4i-usb.c | 28 +++++++++++------------
>> ----
>>  1 file changed, 11 insertions(+), 17 deletions(-)
>>
>> diff --git a/drivers/phy/allwinner/phy-sun4i-usb.c
>> b/drivers/phy/allwinner/phy-sun4i-usb.c
>> index 651d5e2a25ce..4ba0699e0bb4 100644
>> --- a/drivers/phy/allwinner/phy-sun4i-usb.c
>> +++ b/drivers/phy/allwinner/phy-sun4i-usb.c
>> @@ -115,9 +115,9 @@ struct sun4i_usb_phy_cfg {
>>  	int hsic_index;
>>  	enum sun4i_usb_phy_type type;
>>  	u32 disc_thresh;
>> +	u32 pmu_unk1_clrbits;
>>  	u8 phyctl_offset;
>>  	bool dedicated_clocks;
>> -	bool enable_pmu_unk1;
>>  	bool phy0_dual_route;
>>  	int missing_phys;
>>  };
>> @@ -288,6 +288,12 @@ static int sun4i_usb_phy_init(struct phy *_phy)
>>  		return ret;
>>  	}
>>  
>> +	if (phy->pmu && data->cfg->pmu_unk1_clrbits) {
>> +		val = readl(phy->pmu + REG_PMU_UNK1);
>> +		val &= ~data->cfg->pmu_unk1_clrbits;
>> +		writel(val, phy->pmu + REG_PMU_UNK1);
>> +	}
>> +
>>  	if (data->cfg->type == sun8i_a83t_phy ||
>>  	    data->cfg->type == sun50i_h6_phy) {
>>  		if (phy->index == 0) {
>> @@ -297,11 +303,6 @@ static int sun4i_usb_phy_init(struct phy *_phy)
>>  			writel(val, data->base + data->cfg-
>>> phyctl_offset);
>>  		}
>>  	} else {
>> -		if (phy->pmu && data->cfg->enable_pmu_unk1) {
>> -			val = readl(phy->pmu + REG_PMU_UNK1);
>> -			writel(val & ~2, phy->pmu + REG_PMU_UNK1);
>> -		}
>> -
>>  		/* Enable USB 45 Ohm resistor calibration */
>>  		if (phy->index == 0)
>>  			sun4i_usb_phy_write(phy, PHY_RES45_CAL_EN,
>> 0x01, 1);
>> @@ -867,7 +868,6 @@ static const struct sun4i_usb_phy_cfg
>> sun4i_a10_cfg = {
>>  	.disc_thresh = 3,
>>  	.phyctl_offset = REG_PHYCTL_A10,
>>  	.dedicated_clocks = false,
>> -	.enable_pmu_unk1 = false,
>>  };
>>  
>>  static const struct sun4i_usb_phy_cfg sun5i_a13_cfg = {
>> @@ -876,7 +876,6 @@ static const struct sun4i_usb_phy_cfg
>> sun5i_a13_cfg = {
>>  	.disc_thresh = 2,
>>  	.phyctl_offset = REG_PHYCTL_A10,
>>  	.dedicated_clocks = false,
>> -	.enable_pmu_unk1 = false,
>>  };
>>  
>>  static const struct sun4i_usb_phy_cfg sun6i_a31_cfg = {
>> @@ -885,7 +884,6 @@ static const struct sun4i_usb_phy_cfg
>> sun6i_a31_cfg = {
>>  	.disc_thresh = 3,
>>  	.phyctl_offset = REG_PHYCTL_A10,
>>  	.dedicated_clocks = true,
>> -	.enable_pmu_unk1 = false,
>>  };
>>  
>>  static const struct sun4i_usb_phy_cfg sun7i_a20_cfg = {
>> @@ -894,7 +892,6 @@ static const struct sun4i_usb_phy_cfg
>> sun7i_a20_cfg = {
>>  	.disc_thresh = 2,
>>  	.phyctl_offset = REG_PHYCTL_A10,
>>  	.dedicated_clocks = false,
>> -	.enable_pmu_unk1 = false,
>>  };
>>  
>>  static const struct sun4i_usb_phy_cfg sun8i_a23_cfg = {
>> @@ -903,7 +900,6 @@ static const struct sun4i_usb_phy_cfg
>> sun8i_a23_cfg = {
>>  	.disc_thresh = 3,
>>  	.phyctl_offset = REG_PHYCTL_A10,
>>  	.dedicated_clocks = true,
>> -	.enable_pmu_unk1 = false,
>>  };
>>  
>>  static const struct sun4i_usb_phy_cfg sun8i_a33_cfg = {
>> @@ -912,7 +908,6 @@ static const struct sun4i_usb_phy_cfg
>> sun8i_a33_cfg = {
>>  	.disc_thresh = 3,
>>  	.phyctl_offset = REG_PHYCTL_A33,
>>  	.dedicated_clocks = true,
>> -	.enable_pmu_unk1 = false,
>>  };
>>  
>>  static const struct sun4i_usb_phy_cfg sun8i_a83t_cfg = {
>> @@ -929,7 +924,7 @@ static const struct sun4i_usb_phy_cfg
>> sun8i_h3_cfg = {
>>  	.disc_thresh = 3,
>>  	.phyctl_offset = REG_PHYCTL_A33,
>>  	.dedicated_clocks = true,
>> -	.enable_pmu_unk1 = true,
>> +	.pmu_unk1_clrbits = BIT(1),
>>  	.phy0_dual_route = true,
>>  };
>>  
>> @@ -939,7 +934,7 @@ static const struct sun4i_usb_phy_cfg
>> sun8i_r40_cfg = {
>>  	.disc_thresh = 3,
>>  	.phyctl_offset = REG_PHYCTL_A33,
>>  	.dedicated_clocks = true,
>> -	.enable_pmu_unk1 = true,
>> +	.pmu_unk1_clrbits = BIT(1),
>>  	.phy0_dual_route = true,
>>  };
>>  
>> @@ -949,7 +944,7 @@ static const struct sun4i_usb_phy_cfg
>> sun8i_v3s_cfg = {
>>  	.disc_thresh = 3,
>>  	.phyctl_offset = REG_PHYCTL_A33,
>>  	.dedicated_clocks = true,
>> -	.enable_pmu_unk1 = true,
>> +	.pmu_unk1_clrbits = BIT(1),
>>  	.phy0_dual_route = true,
>>  };
>>  
>> @@ -959,7 +954,7 @@ static const struct sun4i_usb_phy_cfg
>> sun50i_a64_cfg = {
>>  	.disc_thresh = 3,
>>  	.phyctl_offset = REG_PHYCTL_A33,
>>  	.dedicated_clocks = true,
>> -	.enable_pmu_unk1 = true,
>> +	.pmu_unk1_clrbits = BIT(1),
>>  	.phy0_dual_route = true,
>>  };
>>  
>> @@ -969,7 +964,6 @@ static const struct sun4i_usb_phy_cfg
>> sun50i_h6_cfg = {
>>  	.disc_thresh = 3,
>>  	.phyctl_offset = REG_PHYCTL_A33,
>>  	.dedicated_clocks = true,
>> -	.enable_pmu_unk1 = true,
>>  	.phy0_dual_route = true,
>>  	.missing_phys = BIT(1) | BIT(2),
>>  };

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