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Date: Wed, 30 Jan 2019 18:30:30 +0530
From: Kishon Vijay Abraham I <kishon@...com>
To: Roger Quadros <rogerq@...com>
CC: <linux-omap@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] phy: ti-pipe3: Add set_mode callback to configure usb3
phy as pcie phy
Hi Roger,
On 30/01/19 6:11 PM, Roger Quadros wrote:
> Kishon,
>
> On 30/01/19 12:59, Kishon Vijay Abraham I wrote:
>> Hi Roger,
>>
>> On 30/01/19 4:18 PM, Roger Quadros wrote:
>>> Hi Kishon,
>>>
>>> On 24/01/19 12:48, Kishon Vijay Abraham I wrote:
>>>> DRA72 platform has the second instance of PHY shared between USB3
>>>> controller and PCIe controller with default as USB3 controller.
>>>> Since it is used with USB3 controller by default, it uses the
>>>> compatible specific to USB (ti,omap-usb3).
>>>>
>>>> Populate set_mode callback so that the USB3 PHY can be configured
>>>> to be used with PCIe controller.
>>>
>>> What is the use case of this? At what point and who decides the
>>> phy_set_mode() to be called with USB vs PCIe?
>>
>> The PHY by default is configured to be used with USB controller (That's why it
>> has a compatible of ti,omap-usb3). However there is a special case where this
>> PHY has to be used PCIe controller. So the set_mode() will help the PHY driver
>> to configure the USB PHY to be used with PCIe controller.
>>
>> This is not a shared PHY, so the PHY as such can be used only with USB or PCIe
>> and is determined at designtime
>
> If type is defined at design time then the design using the PHY for PCIe shouldn't be
> using "ti,omap-usb3" compatible. Right?
The second instance of PIPE3 PHY in dra72x SoC can be used either with USB3 or
as a second lane of the 1st PCIe instance. How it is connected is based on
board design. DRA72x EVM will need board modification for the PHY to be used
with PCIe (by default it is connected to USB). AM571x IDK doesn't have a USB3
port so the PIPE3 PHY is used with PCIe (USB2 also doesn't work with this
configuration but that is a different HW issue).
I'm not sure if we should change the compatible in board dts file as it is
based on board design. Previously I added a dt property to indicate the PHY
should be configured for PCIe but Rob Herring suggested to use set_mode [1].
Thanks
Kishon
[1] -> https://lore.kernel.org/patchwork/patch/865398/
>
> Maybe we should fix the DT? Which board/PHY is this about?
>
> cheers,
> -roger
>
>>>
>>>
>>>>
>>>> Signed-off-by: Kishon Vijay Abraham I <kishon@...com>
>>>> ---
>>>> drivers/phy/ti/phy-ti-pipe3.c | 66 ++++++++++++++++++++++++++++-------
>>>> 1 file changed, 54 insertions(+), 12 deletions(-)
>>>>
>>>> diff --git a/drivers/phy/ti/phy-ti-pipe3.c b/drivers/phy/ti/phy-ti-pipe3.c
>>>> index 68ce4a082b9b..8c98f366416d 100644
>>>> --- a/drivers/phy/ti/phy-ti-pipe3.c
>>>> +++ b/drivers/phy/ti/phy-ti-pipe3.c
>>>> @@ -56,6 +56,12 @@
>>>>
>>>> #define SATA_PLL_SOFT_RESET BIT(18)
>>>>
>>>> +#define PHY_RX_ANA_PRGRAMMABILITY_REG 0xC
>>>> +#define MEM_EN_PLLBYP BIT(7)
>>>> +
>>>> +#define PHY_TX_TEST_CONFIG 0x2C
>>>> +#define MEM_ENTESTCLK BIT(31)
>>>> +
>>>> #define PIPE3_PHY_PWRCTL_CLK_CMD_MASK 0x003FC000
>>>> #define PIPE3_PHY_PWRCTL_CLK_CMD_SHIFT 14
>>>>
>>>> @@ -110,6 +116,8 @@
>>>> #define PLL_IDLE_TIME 100 /* in milliseconds */
>>>> #define PLL_LOCK_TIME 100 /* in milliseconds */
>>>>
>>>> +#define PIPE3_PHY_DISABLE_SYNC_POWER BIT(4)
>>>> +
>>>> struct pipe3_dpll_params {
>>>> u16 m;
>>>> u8 n;
>>>> @@ -141,6 +149,7 @@ struct ti_pipe3 {
>>>> unsigned int power_reg; /* power reg. index within syscon */
>>>> unsigned int pcie_pcs_reg; /* pcs reg. index in syscon */
>>>> bool sata_refclk_enabled;
>>>> + u32 mode;
>>>> };
>>>>
>>>> static struct pipe3_dpll_map dpll_map_usb[] = {
>>>> @@ -233,7 +242,10 @@ static int ti_pipe3_power_on(struct phy *x)
>>>> rate = rate / 1000000;
>>>> mask = OMAP_CTRL_PIPE3_PHY_PWRCTL_CLK_CMD_MASK |
>>>> OMAP_CTRL_PIPE3_PHY_PWRCTL_CLK_FREQ_MASK;
>>>> - val = PIPE3_PHY_TX_RX_POWERON << PIPE3_PHY_PWRCTL_CLK_CMD_SHIFT;
>>>> + val = PIPE3_PHY_TX_RX_POWERON;
>>>> + if (phy->mode == PHY_MODE_PCIE)
>>>> + val |= PIPE3_PHY_DISABLE_SYNC_POWER;
>>>> + val <<= PIPE3_PHY_PWRCTL_CLK_CMD_SHIFT;
>>>> val |= rate << OMAP_CTRL_PIPE3_PHY_PWRCTL_CLK_FREQ_SHIFT;
>>>>
>>>> ret = regmap_update_bits(phy->phy_power_syscon, phy->power_reg,
>>>> @@ -328,13 +340,11 @@ static void ti_pipe3_calibrate(struct ti_pipe3 *phy)
>>>> ti_pipe3_writel(phy->phy_rx, PCIEPHYRX_EQUALIZER, val);
>>>> }
>>>>
>>>> -static int ti_pipe3_init(struct phy *x)
>>>> +static int ti_pipe3_pcie_init(struct ti_pipe3 *phy)
>>>> {
>>>> - struct ti_pipe3 *phy = phy_get_drvdata(x);
>>>> - u32 val;
>>>> int ret = 0;
>>>> + u32 val;
>>>>
>>>> - ti_pipe3_enable_clocks(phy);
>>>> /*
>>>> * Set pcie_pcs register to 0x96 for proper functioning of phy
>>>> * as recommended in AM572x TRM SPRUHZ6, section 18.5.2.2, table
>>>> @@ -353,10 +363,31 @@ static int ti_pipe3_init(struct phy *x)
>>>> return ret;
>>>>
>>>> ti_pipe3_calibrate(phy);
>>>> -
>>>> - return 0;
>>>> + } else {
>>>> + val = ti_pipe3_readl(phy->phy_rx,
>>>> + PHY_RX_ANA_PRGRAMMABILITY_REG);
>>>> + val |= MEM_EN_PLLBYP;
>>>> + ti_pipe3_writel(phy->phy_rx, PHY_RX_ANA_PRGRAMMABILITY_REG,
>>>> + val);
>>>> + val = ti_pipe3_readl(phy->phy_tx, PHY_TX_TEST_CONFIG);
>>>> + val |= MEM_ENTESTCLK;
>>>> + ti_pipe3_writel(phy->phy_tx, PHY_TX_TEST_CONFIG, val);
>>>> }
>>>>
>>>> + return 0;
>>>> +}
>>>> +
>>>> +static int ti_pipe3_init(struct phy *x)
>>>> +{
>>>> + struct ti_pipe3 *phy = phy_get_drvdata(x);
>>>> + u32 val;
>>>> + int ret = 0;
>>>> +
>>>> + ti_pipe3_enable_clocks(phy);
>>>> +
>>>> + if (phy->mode == PHY_MODE_PCIE)
>>>> + return ti_pipe3_pcie_init(phy);
>>>> +
>>>> /* Bring it out of IDLE if it is IDLE */
>>>> val = ti_pipe3_readl(phy->pll_ctrl_base, PLL_CONFIGURATION2);
>>>> if (val & PLL_IDLE) {
>>>> @@ -395,7 +426,7 @@ static int ti_pipe3_exit(struct phy *x)
>>>> return 0;
>>>>
>>>> /* PCIe doesn't have internal DPLL */
>>>> - if (!of_device_is_compatible(phy->dev->of_node, "ti,phy-pipe3-pcie")) {
>>>> + if (!(phy->mode == PHY_MODE_PCIE)) {
>>>> /* Put DPLL in IDLE mode */
>>>> val = ti_pipe3_readl(phy->pll_ctrl_base, PLL_CONFIGURATION2);
>>>> val |= PLL_IDLE;
>>>> @@ -429,11 +460,25 @@ static int ti_pipe3_exit(struct phy *x)
>>>>
>>>> return 0;
>>>> }
>>>> +
>>>> +static int ti_pipe3_set_mode(struct phy *x, enum phy_mode mode, int submode)
>>>> +{
>>>> + struct ti_pipe3 *phy = phy_get_drvdata(x);
>>>> +
>>>> + if (phy->mode != PHY_MODE_INVALID)
>>>> + return -EBUSY;
>>>> +
>>>> + phy->mode = mode;
>>>
>>> You are only saving the mode. But not really switching modes here.
>>> How is this intended to work?
>>
>> The PHY doesn't have a specific mode. Rather it is a set of configurations
>> required to operate in a particular mode.
>>
>> This mode value will be used in other init, power_on callback functions.
>>
>> Thanks
>> Kishon
>>
>
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