linux-kernel - Re: [PATCH 1/3] usb: xhci: add quirk flag for broken PED bits

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Date:   Mon, 21 Nov 2016 13:51:43 +0200
From:   Roger Quadros <rogerq@...com>
To:     Sergei Shtylyov <sergei.shtylyov@...entembedded.com>,
        <balbi@...nel.org>, <mathias.nyman@...el.com>
CC:     <linux-usb@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/3] usb: xhci: add quirk flag for broken PED bits

On 18/11/16 12:49, Sergei Shtylyov wrote:
> Hello.
> 
> On 11/17/2016 6:01 PM, Roger Quadros wrote:
> 
>> From: Felipe Balbi <balbi@...com>
>>
>> Some devices from Texas Instruments [1] suffer from
>> a silicon bug where Port Enabled/Disabled bit
>> should not be used to silence an erroneous device.
>>
>> The bug is so that if port is disabled with PED
>> bit, an IRQ for device removal (or attachment)
>> will never fire.
>>
>> Just for the sake of completeness, the actual
>> problem lies with SNPS USB IP and this affects
>> all known versions up to 3.00a. A separate
>> patch will be added to dwc3 to enabled this
>> quirk flag if version is <= 3.00a.
>>
>> [1] - AM572x Silicon Errata http://www.ti.com/lit/er/sprz429j/sprz429j.pdf
>> Section i896— USB xHCI Port Disable Feature Does Not Work
>>
>> Signed-off-by: Felipe Balbi <balbi@...com>
>> Signed-off-by: Roger Quadros <rogerq@...com>
>> ---
>>  drivers/usb/host/xhci-hub.c | 6 ++++++
>>  drivers/usb/host/xhci.h     | 3 +++
>>  2 files changed, 9 insertions(+)
>>
>> diff --git a/drivers/usb/host/xhci-hub.c b/drivers/usb/host/xhci-hub.c
>> index 0ef1690..c3c051d 100644
>> --- a/drivers/usb/host/xhci-hub.c
>> +++ b/drivers/usb/host/xhci-hub.c
>> @@ -458,6 +458,12 @@ static void xhci_disable_port(struct usb_hcd *hcd, struct xhci_hcd *xhci,
>>          return;
>>      }
>>
>> +    if (xhci->quirks & XHCI_BROKEN_PORT_PED) {
>> +        xhci_dbg(xhci, "Broken Port Enabled/Disabled, ignoring "
>> +                "port disable request.\n");
> 
>    The messages shouldn't be broken up to facilitate grepping.
> 
> [...]
>> diff --git a/drivers/usb/host/xhci.h b/drivers/usb/host/xhci.h
>> index f945380..4f724aa 100644
>> --- a/drivers/usb/host/xhci.h
>> +++ b/drivers/usb/host/xhci.h
>> @@ -1656,6 +1656,9 @@ struct xhci_hcd {
>>  #define XHCI_SSIC_PORT_UNUSED    (1 << 22)
>>  #define XHCI_NO_64BIT_SUPPORT    (1 << 23)
>>  #define XHCI_MISSING_CAS    (1 << 24)
>> +/* For controller with a broken Port Disable implementation */
>> +#define XHCI_BROKEN_PORT_PED    (1 << 21)
> 
>    Indent with tabs as above, please.
> 
> [...]
> 

Thanks. I've fixed both issues and sent a v2.

cheers,
-roger