From 4e0dcf62ab4cf917d0cbe751b8bf229a065248d4 Mon Sep 17 00:00:00 2001
From: Ryan Chen <ryan_chen@aspeedtech.com>
Date: Fri, 8 Jan 2021 16:12:38 +0800
Subject: [PATCH] usb: gadget: aspeed: fix stop dma register setting.
Git-commit: 4e0dcf62ab4cf917d0cbe751b8bf229a065248d4
Patch-mainline: v5.11-rc5
References: git-fixes
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
Fixes: 7ecca2a4080c ("usb/gadget: Add driver for Aspeed SoC virtual hub")
Cc: stable <stable@vger.kernel.org>
Acked-by: Felipe Balbi <balbi@kernel.org>
Acked-by: Joel Stanley <joel@jms.id.au>
Signed-off-by: Ryan Chen <ryan_chen@aspeedtech.com>
Link: https://lore.kernel.org/r/20210108081238.10199-2-ryan_chen@aspeedtech.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Acked-by: Takashi Iwai <tiwai@suse.de>
---
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);
/* Wait for it to complete */
for (loops = 0; loops < 1000; loops++) {
--
2.26.2