linux-kernel - Re: [PATCH 1/3] usb: musb: musb_host: Enable ISOCH IN handling for AM335x host

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Date:	Mon, 27 Jan 2014 14:51:04 +0530
From:	George Cherian <george.cherian@...com>
To:	Sergei Shtylyov <sergei.shtylyov@...entembedded.com>,
	<linux-usb@...r.kernel.org>
CC:	<balbi@...com>, <gregkh@...uxfoundation.org>,
	<linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/3] usb: musb: musb_host: Enable ISOCH IN handling for
 AM335x host

On 1/24/2014 11:13 PM, Sergei Shtylyov wrote:
> Hello.
>
> On 24-01-2014 18:14, George Cherian wrote:
>
>> Enable the isochrounous IN handling for AM335x HOST.
>> Reprogram CPPI to receive consecutive ISOCH frames in the same URB.
>
>    Sigh, I knew CPPI ISO path was broken for years but didn't have 
> time to fix it. :-(
>
>> Signed-off-by: George Cherian <george.cherian@...com>
>> --- git rebase
>>   drivers/usb/musb/musb_host.c | 29 ++++++++++++++++++++++++++---
>>   1 file changed, 26 insertions(+), 3 deletions(-)
>
>> diff --git a/drivers/usb/musb/musb_host.c b/drivers/usb/musb/musb_host.c
>> index ed45572..5b6482c 100644
>> --- a/drivers/usb/musb/musb_host.c
>> +++ b/drivers/usb/musb/musb_host.c
>> @@ -1689,9 +1689,11 @@ void musb_host_rx(struct musb *musb, u8 epnum)
>>               | MUSB_RXCSR_H_AUTOREQ
>>               | MUSB_RXCSR_AUTOCLEAR
>>               | MUSB_RXCSR_RXPKTRDY);
>> +
>
>    Not needed.
>
>>           musb_writew(hw_ep->regs, MUSB_RXCSR, val);
>>
>> -#if defined(CONFIG_USB_INVENTRA_DMA) || defined(CONFIG_USB_UX500_DMA)
>> +#if defined(CONFIG_USB_INVENTRA_DMA) || 
>> defined(CONFIG_USB_UX500_DMA) || \
>> +    defined(CONFIG_USB_TI_CPPI41_DMA)
>
>    The DaVinci CPPI 3.0 should probably also be included here...
>
Should'nt that be a separate patch as this one is specific to AM335X.
>>           if (usb_pipeisoc(pipe)) {
>>               struct usb_iso_packet_descriptor *d;
>>
>> @@ -1706,8 +1708,28 @@ void musb_host_rx(struct musb *musb, u8 epnum)
>>
>>               if (++qh->iso_idx >= urb->number_of_packets)
>>                   done = true;
>> -            else
>> +            else {
>
>    If you're making the *else* arm use {}, you should make all the 
> other arms of *if* statement also have them -- see 
> Documentation/CodingStyle.

Will fix in v2!!!
>
> WBR, Sergei
>


-- 
-George

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