linux-kernel - Re: [PATCH v2 05/10] usb: musb: tusb6010_omap: Do not reset the other direction's packet size

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Message-ID: <20170511141235.GD7154@uda0271908>
Date:   Thu, 11 May 2017 09:12:35 -0500
From:   Bin Liu <b-liu@...com>
To:     Peter Ujfalusi <peter.ujfalusi@...com>
CC:     Joe Perches <joe@...ches.com>, <tony@...mide.com>,
        <gregkh@...uxfoundation.org>, <vinod.koul@...el.com>,
        <linux-usb@...r.kernel.org>, <linux-omap@...r.kernel.org>,
        <balbi@...nel.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 05/10] usb: musb: tusb6010_omap: Do not reset the
 other direction's packet size

On Thu, May 11, 2017 at 09:19:17AM +0300, Peter Ujfalusi wrote:
> 
> 
> On 2017-05-11 02:16, Joe Perches wrote:
> >On Wed, 2017-05-10 at 12:07 -0500, Bin Liu wrote:
> >>On Wed, May 10, 2017 at 11:42:27AM +0300, Peter Ujfalusi wrote:
> >>>We have one register for each EP to set the maximum packet size for both
> >>>TX and RX.
> >>>If for example an RX programming would happen before the previous TX
> >>>transfer finishes we would reset the TX packet side.
> >>>
> >>>To fix this issue, only modify the TX or RX part of the register.
> >[]
> >>>diff --git a/drivers/usb/musb/tusb6010_omap.c b/drivers/usb/musb/tusb6010_omap.c
> >[]
> >>>@@ -389,15 +389,19 @@ static int tusb_omap_dma_program(struct dma_channel *channel, u16 packet_sz,
> >>>  	if (chdat->tx) {
> >>>  		/* Send transfer_packet_sz packets at a time */
> >>>-		musb_writel(ep_conf, TUSB_EP_MAX_PACKET_SIZE_OFFSET,
> >>>-			chdat->transfer_packet_sz);
> >>>+		u32 psize = musb_readl(ep_conf, TUSB_EP_MAX_PACKET_SIZE_OFFSET);
> >>
> >>checkpatch.pl complains about declaration and assignment together.
> >
> >No it doesn't.
> 
> It 'only' complains about:
> WARNING: Missing a blank line after declarations

It was it. My bad, I was multi-tasking and didn't read the log
carefully.

> 
> which is valid.

So will you update the patch to move the declaration to the beginning of
the function to avoid this WARNING. I would just fix it locally if you
prefer.

Regards,
-Bin.