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Date: Mon, 11 Jan 2021 02:24:27 +0000 From: Joel Stanley <joel@....id.au> To: Ryan Chen <ryan_chen@...eedtech.com>, Benjamin Herrenschmidt <benh@...nel.crashing.org> Cc: BMC-SW <BMC-SW@...eedtech.com>, Felipe Balbi <balbi@...nel.org>, Greg Kroah-Hartman <gregkh@...uxfoundation.org>, Andrew Jeffery <andrew@...id.au>, linux-usb@...r.kernel.org, Linux ARM <linux-arm-kernel@...ts.infradead.org>, linux-aspeed <linux-aspeed@...ts.ozlabs.org>, Linux Kernel Mailing List <linux-kernel@...r.kernel.org> Subject: Re: [PATCH 1/1] usb: gadget: aspeed: fix stop dma register setting. On Fri, 8 Jan 2021 at 08:13, Ryan Chen <ryan_chen@...eedtech.com> wrote: > > The vhub engine has two dma mode, one is descriptor list, another > is single stage DMA. Each mode has different stop register setting. > Descriptor list operation (bit2) : 0 disable reset, 1: enable reset > Single mode operation (bit0) : 0 : disable, 1: enable > > Signed-off-by: Ryan Chen <ryan_chen@...eedtech.com> > --- > drivers/usb/gadget/udc/aspeed-vhub/epn.c | 5 ++++- > 1 file changed, 4 insertions(+), 1 deletion(-) > > diff --git a/drivers/usb/gadget/udc/aspeed-vhub/epn.c b/drivers/usb/gadget/udc/aspeed-vhub/epn.c > index 0bd6b20435b8..02d8bfae58fb 100644 > --- a/drivers/usb/gadget/udc/aspeed-vhub/epn.c > +++ b/drivers/usb/gadget/udc/aspeed-vhub/epn.c > @@ -420,7 +420,10 @@ static void ast_vhub_stop_active_req(struct ast_vhub_ep *ep, > u32 state, reg, loops; > > /* Stop DMA activity */ > - writel(0, ep->epn.regs + AST_VHUB_EP_DMA_CTLSTAT); > + if (ep->epn.desc_mode) > + writel(VHUB_EP_DMA_CTRL_RESET, ep->epn.regs + AST_VHUB_EP_DMA_CTLSTAT); > + else > + writel(0, ep->epn.regs + AST_VHUB_EP_DMA_CTLSTAT); This looks correct, as whenever the driver re-enables DMA it uses ep->epn.dma_conf for the value of this register. So we're not losing any configuration by setting it to 0. Acked-by: Joel Stanley <joel@....id.au> Fixes: 7ecca2a4080c ("usb/gadget: Add driver for Aspeed SoC virtual hub") I've cc'd Ben for his ack too. Cheers, Joel > > /* Wait for it to complete */ > for (loops = 0; loops < 1000; loops++) { > -- > 2.17.1 >
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