[U-Boot] [PATCH] sunxi: H3: Do not clear usb companion clk-gate / reset on remove

[Hans de Goede <hdegoede@redhat.com>]

Hi,

On 10-04-16 10:18, Ian Campbell wrote:
> On Sat, 2016-04-09 at 15:23 +0200, Hans de Goede wrote:
>> On the H3 we need to enable the clk and de-assert the reset of the
>> companion to be able to talk to the actual usb host controller.
>>
>> Before this commit we were also disabling the companion clk-gate /
>> asserting its reset on remove, causing the later remove callback of
>> the companion itself to (sometimes) fail with:
>>
>> ERROR: USB HC reset timed out!
>>
>> This commit fixes this by not disabling the companion's clk-gate nor
>> asserting its reset on remove.
>
> This sounds like a bug (or perhaps lack of expressiveness) in the DM
> clk bindings to me, but I can see why we want to do it this way shirt
> term:

Actually the problem is that in u-boot the sunxi glue is not using
a proper clk / reset driver. The in kernel clk/reset driver keep
a usage count and only disable the clk on the last disable / (re)assert
the reset on the last assert.

>> Signed-off-by: Hans de Goede <hdegoede@redhat.com>
>
> Acked-by: Ian Campbell <ijc@hellion.org.uk>

Thanks & Regards,

Hans


>
>> ---
>>   drivers/usb/host/ehci-sunxi.c | 10 +++++++---
>>   drivers/usb/host/ohci-sunxi.c | 10 +++++++---
>>   2 files changed, 14 insertions(+), 6 deletions(-)
>>
>> diff --git a/drivers/usb/host/ehci-sunxi.c b/drivers/usb/host/ehci-
>> sunxi.c
>> index d5eb492..f2d83e3 100644
>> --- a/drivers/usb/host/ehci-sunxi.c
>> +++ b/drivers/usb/host/ehci-sunxi.c
>> @@ -38,6 +38,7 @@ static int ehci_usb_probe(struct udevice *dev)
>>   	struct ehci_sunxi_priv *priv = dev_get_priv(dev);
>>   	struct ehci_hccr *hccr = (struct ehci_hccr
>> *)dev_get_addr(dev);
>>   	struct ehci_hcor *hcor;
>> +	int extra_ahb_gate_mask = 0;
>>
>>   	/*
>>   	 * This should go away once we've moved to the driver model
>> for
>> @@ -45,15 +46,18 @@ static int ehci_usb_probe(struct udevice *dev)
>>   	 */
>>   	priv->ahb_gate_mask = 1 << AHB_GATE_OFFSET_USB_EHCI0;
>>   #ifdef CONFIG_MACH_SUN8I_H3
>> -	priv->ahb_gate_mask |= 1 << AHB_GATE_OFFSET_USB_OHCI0;
>> +	extra_ahb_gate_mask = 1 << AHB_GATE_OFFSET_USB_OHCI0;
>>   #endif
>>   	priv->phy_index = ((u32)hccr - SUNXI_USB1_BASE) / BASE_DIST;
>>   	priv->ahb_gate_mask <<= priv->phy_index * AHB_CLK_DIST;
>> +	extra_ahb_gate_mask <<= priv->phy_index * AHB_CLK_DIST;
>>   	priv->phy_index++; /* Non otg phys start at 1 */
>>
>> -	setbits_le32(&ccm->ahb_gate0, priv->ahb_gate_mask);
>> +	setbits_le32(&ccm->ahb_gate0,
>> +		     priv->ahb_gate_mask | extra_ahb_gate_mask);
>>   #ifdef CONFIG_SUNXI_GEN_SUN6I
>> -	setbits_le32(&ccm->ahb_reset0_cfg, priv->ahb_gate_mask);
>> +	setbits_le32(&ccm->ahb_reset0_cfg,
>> +		     priv->ahb_gate_mask | extra_ahb_gate_mask);
>>   #endif
>>
>>   	sunxi_usb_phy_init(priv->phy_index);
>> diff --git a/drivers/usb/host/ohci-sunxi.c b/drivers/usb/host/ohci-
>> sunxi.c
>> index 6f3f4ce..2a1e8bf 100644
>> --- a/drivers/usb/host/ohci-sunxi.c
>> +++ b/drivers/usb/host/ohci-sunxi.c
>> @@ -38,6 +38,7 @@ static int ohci_usb_probe(struct udevice *dev)
>>   	struct usb_bus_priv *bus_priv = dev_get_uclass_priv(dev);
>>   	struct ohci_sunxi_priv *priv = dev_get_priv(dev);
>>   	struct ohci_regs *regs = (struct ohci_regs
>> *)dev_get_addr(dev);
>> +	int extra_ahb_gate_mask = 0;
>>
>>   	bus_priv->companion = true;
>>
>> @@ -47,18 +48,21 @@ static int ohci_usb_probe(struct udevice *dev)
>>   	 */
>>   	priv->ahb_gate_mask = 1 << AHB_GATE_OFFSET_USB_OHCI0;
>>   #ifdef CONFIG_MACH_SUN8I_H3
>> -	priv->ahb_gate_mask |= 1 << AHB_GATE_OFFSET_USB_EHCI0;
>> +	extra_ahb_gate_mask = 1 << AHB_GATE_OFFSET_USB_EHCI0;
>>   #endif
>>   	priv->usb_gate_mask = CCM_USB_CTRL_OHCI0_CLK;
>>   	priv->phy_index = ((u32)regs - (SUNXI_USB1_BASE + 0x400)) /
>> BASE_DIST;
>>   	priv->ahb_gate_mask <<= priv->phy_index * AHB_CLK_DIST;
>> +	extra_ahb_gate_mask <<= priv->phy_index * AHB_CLK_DIST;
>>   	priv->usb_gate_mask <<= priv->phy_index;
>>   	priv->phy_index++; /* Non otg phys start at 1 */
>>
>> -	setbits_le32(&ccm->ahb_gate0, priv->ahb_gate_mask);
>> +	setbits_le32(&ccm->ahb_gate0,
>> +		     priv->ahb_gate_mask | extra_ahb_gate_mask);
>>   	setbits_le32(&ccm->usb_clk_cfg, priv->usb_gate_mask);
>>   #ifdef CONFIG_SUNXI_GEN_SUN6I
>> -	setbits_le32(&ccm->ahb_reset0_cfg, priv->ahb_gate_mask);
>> +	setbits_le32(&ccm->ahb_reset0_cfg,
>> +		     priv->ahb_gate_mask | extra_ahb_gate_mask);
>>   #endif
>>
>>   	sunxi_usb_phy_init(priv->phy_index);