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SubjectRe: [PATCH v2 12/26] drm/sun4i: Add support for multiple DW HDMI PHY clock parents
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Hi, Jernej,

On 05/18/2018 06:15 PM, Jernej Škrabec wrote:
> Hi,
>
> Dne petek, 18. maj 2018 ob 17:09:40 CEST je Sergey Suloev napisal(a):
>> Hi, guys,
>>
>> On 05/18/2018 05:46 PM, Jernej Škrabec wrote:
>>> Hi,
>>>
>>> Dne petek, 18. maj 2018 ob 12:01:16 CEST je Maxime Ripard napisal(a):
>>>> On Fri, May 18, 2018 at 03:15:22PM +0530, Jagan Teki wrote:
>>>>> From: Jernej Skrabec <jernej.skrabec@siol.net>
>>>>>
>>>>> Some SoCs with DW HDMI have multiple possible clock parents, like A64
>>>>> and R40.
>>>>>
>>>>> Expand HDMI PHY clock driver to support second clock parent.
>>>>>
>>>>> Signed-off-by: Jernej Skrabec <jernej.skrabec@siol.net>
>>>>> Signed-off-by: Jagan Teki <jagan@amarulasolutions.com>
>>>>> ---
>>>>> Changes for v2:
>>>>> - new patch
>>>>>
>>>>> drivers/gpu/drm/sun4i/sun8i_dw_hdmi.h | 9 ++-
>>>>> drivers/gpu/drm/sun4i/sun8i_hdmi_phy.c | 33 ++++++++---
>>>>> drivers/gpu/drm/sun4i/sun8i_hdmi_phy_clk.c | 89
>>>>> ++++++++++++++++++++++-------- 3 files changed, 96 insertions(+), 35
>>>>> deletions(-)
>>>>>
>>>>> diff --git a/drivers/gpu/drm/sun4i/sun8i_dw_hdmi.h
>>>>> b/drivers/gpu/drm/sun4i/sun8i_dw_hdmi.h index 79154f0f674a..303189d6602c
>>>>> 100644
>>>>> --- a/drivers/gpu/drm/sun4i/sun8i_dw_hdmi.h
>>>>> +++ b/drivers/gpu/drm/sun4i/sun8i_dw_hdmi.h
>>>>> @@ -98,7 +98,8 @@
>>>>>
>>>>> #define SUN8I_HDMI_PHY_PLL_CFG1_LDO2_EN BIT(29)
>>>>> #define SUN8I_HDMI_PHY_PLL_CFG1_LDO1_EN BIT(28)
>>>>> #define SUN8I_HDMI_PHY_PLL_CFG1_HV_IS_33 BIT(27)
>>>>>
>>>>> -#define SUN8I_HDMI_PHY_PLL_CFG1_CKIN_SEL BIT(26)
>>>>> +#define SUN8I_HDMI_PHY_PLL_CFG1_CKIN_SEL_MSK BIT(26)
>>>>> +#define SUN8I_HDMI_PHY_PLL_CFG1_CKIN_SEL_SHIFT 26
>>>>>
>>>>> #define SUN8I_HDMI_PHY_PLL_CFG1_PLLEN BIT(25)
>>>>> #define SUN8I_HDMI_PHY_PLL_CFG1_LDO_VSET(x) ((x) << 22)
>>>>> #define SUN8I_HDMI_PHY_PLL_CFG1_UNKNOWN(x) ((x) << 20)
>>>>>
>>>>> @@ -146,7 +147,7 @@
>>>>>
>>>>> struct sun8i_hdmi_phy;
>>>>>
>>>>> struct sun8i_hdmi_phy_variant {
>>>>>
>>>>> - bool has_phy_clk;
>>>>> + int phy_clk_num;
>>>>>
>>>>> void (*phy_init)(struct sun8i_hdmi_phy *phy);
>>>>> void (*phy_disable)(struct dw_hdmi *hdmi,
>>>>>
>>>>> struct sun8i_hdmi_phy *phy);
>>>>>
>>>>> @@ -160,6 +161,7 @@ struct sun8i_hdmi_phy {
>>>>>
>>>>> struct clk *clk_mod;
>>>>> struct clk *clk_phy;
>>>>> struct clk *clk_pll0;
>>>>>
>>>>> + struct clk *clk_pll1;
>>>>>
>>>>> unsigned int rcal;
>>>>> struct regmap *regs;
>>>>> struct reset_control *rst_phy;
>>>>>
>>>>> @@ -188,6 +190,7 @@ void sun8i_hdmi_phy_remove(struct sun8i_dw_hdmi
>>>>> *hdmi);
>>>>>
>>>>> void sun8i_hdmi_phy_init(struct sun8i_hdmi_phy *phy);
>>>>> const struct dw_hdmi_phy_ops *sun8i_hdmi_phy_get_ops(void);
>>>>>
>>>>> -int sun8i_phy_clk_create(struct sun8i_hdmi_phy *phy, struct device
>>>>> *dev);
>>>>> +int sun8i_phy_clk_create(struct sun8i_hdmi_phy *phy, struct device
>>>>> *dev,
>>>>> + int clk_num);
>>>>>
>>>>> #endif /* _SUN8I_DW_HDMI_H_ */
>>>>>
>>>>> diff --git a/drivers/gpu/drm/sun4i/sun8i_hdmi_phy.c
>>>>> b/drivers/gpu/drm/sun4i/sun8i_hdmi_phy.c index
>>>>> 5a52fc489a9d..0eadf087fc46
>>>>> 100644
>>>>> --- a/drivers/gpu/drm/sun4i/sun8i_hdmi_phy.c
>>>>> +++ b/drivers/gpu/drm/sun4i/sun8i_hdmi_phy.c
>>>>> @@ -183,7 +183,13 @@ static int sun8i_hdmi_phy_config_h3(struct dw_hdmi
>>>>> *hdmi,>
>>>>>
>>>>> regmap_update_bits(phy->regs, SUN8I_HDMI_PHY_ANA_CFG1_REG,
>>>>>
>>>>> SUN8I_HDMI_PHY_ANA_CFG1_TXEN_MASK, 0);
>>>>>
>>>>> - regmap_write(phy->regs, SUN8I_HDMI_PHY_PLL_CFG1_REG, pll_cfg1_init);
>>>>> + /*
>>>>> + * NOTE: We have to be careful not to overwrite PHY parent
>>>>> + * clock selection bit and clock divider.
>>>>> + */
>>>>> + regmap_update_bits(phy->regs, SUN8I_HDMI_PHY_PLL_CFG1_REG,
>>>>> + (u32)~SUN8I_HDMI_PHY_PLL_CFG1_CKIN_SEL_MSK,
>>>>> + pll_cfg1_init);
>>>>>
>>>>> regmap_update_bits(phy->regs, SUN8I_HDMI_PHY_PLL_CFG2_REG,
>>>>>
>>>>> (u32)~SUN8I_HDMI_PHY_PLL_CFG2_PREDIV_MSK,
>>>>> pll_cfg2_init);
>>>>>
>>>>> @@ -232,7 +238,7 @@ static int sun8i_hdmi_phy_config(struct dw_hdmi
>>>>> *hdmi,
>>>>> void *data,>
>>>>>
>>>>> regmap_update_bits(phy->regs, SUN8I_HDMI_PHY_DBG_CTRL_REG,
>>>>>
>>>>> SUN8I_HDMI_PHY_DBG_CTRL_POL_MASK, val);
>>>>>
>>>>> - if (phy->variant->has_phy_clk)
>>>>> + if (phy->variant->phy_clk_num)
>>>>>
>>>>> clk_set_rate(phy->clk_phy, mode->crtc_clock * 1000);
>>>>>
>>>>> return phy->variant->phy_config(hdmi, phy, mode->crtc_clock * 1000);
>>>>>
>>>>> @@ -393,7 +399,7 @@ static const struct sun8i_hdmi_phy_variant
>>>>> sun8i_a83t_hdmi_phy = {>
>>>>>
>>>>> };
>>>>>
>>>>> static const struct sun8i_hdmi_phy_variant sun8i_h3_hdmi_phy = {
>>>>>
>>>>> - .has_phy_clk = true,
>>>>> + .phy_clk_num = 1,
>>>>>
>>>>> .phy_init = &sun8i_hdmi_phy_init_h3,
>>>>> .phy_disable = &sun8i_hdmi_phy_disable_h3,
>>>>> .phy_config = &sun8i_hdmi_phy_config_h3,
>>>>>
>>>>> @@ -464,7 +470,7 @@ int sun8i_hdmi_phy_probe(struct sun8i_dw_hdmi *hdmi,
>>>>> struct device_node *node)>
>>>>>
>>>>> goto err_put_clk_bus;
>>>>>
>>>>> }
>>>>>
>>>>> - if (phy->variant->has_phy_clk) {
>>>>> + if (phy->variant->phy_clk_num) {
>>>>>
>>>>> phy->clk_pll0 = of_clk_get_by_name(node, "pll-0");
>>>>> if (IS_ERR(phy->clk_pll0)) {
>>>>>
>>>>> dev_err(dev, "Could not get pll-0 clock\n");
>>>>>
>>>>> @@ -472,7 +478,16 @@ int sun8i_hdmi_phy_probe(struct sun8i_dw_hdmi
>>>>> *hdmi,
>>>>> struct device_node *node)>
>>>>>
>>>>> goto err_put_clk_mod;
>>>>>
>>>>> }
>>>>>
>>>>> - ret = sun8i_phy_clk_create(phy, dev);
>>>>> + if (phy->variant->phy_clk_num) {
>>>>> + phy->clk_pll1 = of_clk_get_by_name(node, "pll-1");
>>>>> + if (IS_ERR(phy->clk_pll1)) {
>>>>> + dev_err(dev, "Could not get pll-1 clock\n");
>>>>> + ret = PTR_ERR(phy->clk_pll1);
>>>>> + goto err_put_clk_mod;
>>>>> + }
>>>>> + }
>>>>> +
>>>> You have a bug here. If phy_clk_num == 1, you'll still try to lookup
>>>> pll-1.
>>> This is actually WIP patch taken from my github. This issue was fixed
>>> already locally on disk. I thought Jagan will not use it until SRAM C
>>> patches land.>
>>>> And this is a bit sloppy, since if phy_clk_num == 3, you won't try to
>>>> lookup pll-2 either.
>>> It is highly unlikely this will be higher than 2, at least for this HDMI
>>> PHY, since it has only 1 bit reserved for parent selection. But since I
>>> have to fix it, I'll add ">= 2"
>>>
>>>>> + ret = sun8i_phy_clk_create(phy, dev, phy->variant->phy_clk_num);
>>>>>
>>>>> if (ret) {
>>>>>
>>>>> dev_err(dev, "Couldn't create the PHY clock\n");
>>>>> goto err_put_clk_pll0;
>>>>>
>>>>> @@ -515,8 +530,8 @@ int sun8i_hdmi_phy_probe(struct sun8i_dw_hdmi *hdmi,
>>>>> struct device_node *node)>
>>>>>
>>>>> err_put_rst_phy:
>>>>> reset_control_put(phy->rst_phy);
>>>>>
>>>>> err_put_clk_pll0:
>>>>> - if (phy->variant->has_phy_clk)
>>>>> - clk_put(phy->clk_pll0);
>>>>> + clk_put(phy->clk_pll0);
>>>>> + clk_put(phy->clk_pll1);
>>>>>
>>>>> err_put_clk_mod:
>>>>> clk_put(phy->clk_mod);
>>>>>
>>>>> err_put_clk_bus:
>>>>> @@ -536,8 +551,8 @@ void sun8i_hdmi_phy_remove(struct sun8i_dw_hdmi
>>>>> *hdmi)
>>>>>
>>>>> reset_control_put(phy->rst_phy);
>>>>>
>>>>> - if (phy->variant->has_phy_clk)
>>>>> - clk_put(phy->clk_pll0);
>>>>> + clk_put(phy->clk_pll0);
>>>>> + clk_put(phy->clk_pll1);
>>>>>
>>>>> clk_put(phy->clk_mod);
>>>>> clk_put(phy->clk_bus);
>>>>>
>>>>> }
>>>>>
>>>>> diff --git a/drivers/gpu/drm/sun4i/sun8i_hdmi_phy_clk.c
>>>>> b/drivers/gpu/drm/sun4i/sun8i_hdmi_phy_clk.c index
>>>>> faea449812f8..85b12fc96dbc 100644
>>>>> --- a/drivers/gpu/drm/sun4i/sun8i_hdmi_phy_clk.c
>>>>> +++ b/drivers/gpu/drm/sun4i/sun8i_hdmi_phy_clk.c
>>>>> @@ -22,29 +22,36 @@ static int sun8i_phy_clk_determine_rate(struct
>>>>> clk_hw
>>>>> *hw,>
>>>>>
>>>>> {
>>>>>
>>>>> unsigned long rate = req->rate;
>>>>> unsigned long best_rate = 0;
>>>>>
>>>>> - struct clk_hw *parent;
>>>>> + struct clk_hw *best_parent = NULL;
>>>>> + struct clk_hw *parent = NULL;
>>>>>
>>>>> int best_div = 1;
>>>>>
>>>>> - int i;
>>>>> + int i, p;
>>>>>
>>>>> - parent = clk_hw_get_parent(hw);
>>>>> -
>>>>> - for (i = 1; i <= 16; i++) {
>>>>> - unsigned long ideal = rate * i;
>>>>> - unsigned long rounded;
>>>>> -
>>>>> - rounded = clk_hw_round_rate(parent, ideal);
>>>>> -
>>>>> - if (rounded == ideal) {
>>>>> - best_rate = rounded;
>>>>> - best_div = i;
>>>>> - break;
>>>>> - }
>>>>> + for (p = 0; p < clk_hw_get_num_parents(hw); p++) {
>>>>> + parent = clk_hw_get_parent_by_index(hw, p);
>>>>> + if (!parent)
>>>>> + continue;
>>>>>
>>>>> - if (!best_rate ||
>>>>> - abs(rate - rounded / i) <
>>>>> - abs(rate - best_rate / best_div)) {
>>>>> - best_rate = rounded;
>>>>> - best_div = i;
>>>>> + for (i = 1; i <= 16; i++) {
>>>>> + unsigned long ideal = rate * i;
>>>>> + unsigned long rounded;
>>>>> +
>>>>> + rounded = clk_hw_round_rate(parent, ideal);
>>>>> +
>>>>> + if (rounded == ideal) {
>>>>> + best_rate = rounded;
>>>>> + best_div = i;
>>>>> + best_parent = parent;
>>>>> + break;
>>>>> + }
>>>>> +
>>>>> + if (!best_rate ||
>>>>> + abs(rate - rounded / i) <
>>>>> + abs(rate - best_rate / best_div)) {
>>>>> + best_rate = rounded;
>>>>> + best_div = i;
>>>>> + best_parent = parent;
>>>>> + }
>>>>>
>>>>> }
>>>>>
>>>>> }
>>>>>
>>>>> @@ -95,22 +102,58 @@ static int sun8i_phy_clk_set_rate(struct clk_hw
>>>>> *hw,
>>>>> unsigned long rate,>
>>>>>
>>>>> return 0;
>>>>>
>>>>> }
>>>>>
>>>>> +static u8 sun8i_phy_clk_get_parent(struct clk_hw *hw)
>>>>> +{
>>>>> + struct sun8i_phy_clk *priv = hw_to_phy_clk(hw);
>>>>> + u32 reg;
>>>>> +
>>>>> + regmap_read(priv->phy->regs, SUN8I_HDMI_PHY_PLL_CFG1_REG, &reg);
>>>>> + reg = (reg & SUN8I_HDMI_PHY_PLL_CFG1_CKIN_SEL_MSK) >>
>>>>> + SUN8I_HDMI_PHY_PLL_CFG1_CKIN_SEL_SHIFT;
>>>>> +
>>>>> + return reg;
>>>>> +}
>>>>> +
>>>>> +static int sun8i_phy_clk_set_parent(struct clk_hw *hw, u8 index)
>>>>> +{
>>>>> + struct sun8i_phy_clk *priv = hw_to_phy_clk(hw);
>>>>> +
>>>>> + if (index > 1)
>>>>> + return -EINVAL;
>>>>> +
>>>>> + regmap_update_bits(priv->phy->regs, SUN8I_HDMI_PHY_PLL_CFG1_REG,
>>>>> + SUN8I_HDMI_PHY_PLL_CFG1_CKIN_SEL_MSK,
>>>>> + index << SUN8I_HDMI_PHY_PLL_CFG1_CKIN_SEL_SHIFT);
>>>>> +
>>>>> + return 0;
>>>>> +}
>>>>> +
>>>> The DT bindings changes and the clk changes should be part of separate
>>>> patches.
>>> By DT bindings changes you mean code which reads DT and not DT
>>> documentation, right?
>>>
>>> Ok, I'll split it.
>>>
>>> BTW, I'll resend fixed version of this patch for my R40 HDMI series, since
>>> there is nothing to hold it back, unlike for this.
>>>
>>> Best regards,
>>> Jernej
>>>
>>>
>>>
>>> _______________________________________________
>>> linux-arm-kernel mailing list
>>> linux-arm-kernel@lists.infradead.org
>>> http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
>> you have been talking about SRAM patches, required for A64 DE2, for
>> about a half a year.
>> May I ask you to explain in a couple of words why they are so important ?
>> I am really curious because I have DE2 already working on my A64 without
>> those magic patches..
>>
> You probably have HDMI enabled in U-Boot, right? If you disable that driver in
> U-Boot, Linux driver shouldn't work anymore. There is consensus that Linux A64
> DE2 driver shouldn't rely on U-Boot setting bits. Those SRAM C patches will
> probably also affect how DT DE2 entries are written, especially if it will be
> implemented as a bus, as once proposed by Icenowy.
>
> Best regards,
> Jernej
>
>
>
> _______________________________________________
> linux-arm-kernel mailing list
> linux-arm-kernel@lists.infradead.org
> http://lists.infradead.org/mailman/listinfo/linux-arm-kernel

thanks, got it. yes , I think U-Boot is handing this for me. And I am
not using the "bus way".

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