[PATCH AUTOSEL 4.14 109/127] usb: dwc3: Increase timeout for CmdAct cleared by device controller

Sasha Levin
2020-09-18T02:14:38Z

From: Yu Chen <chenyu56@huawei.com>

[ Upstream commit 1c0e69ae1b9f9004fd72978612ae3463791edc56 ]

If the SS PHY is in P3, there is no pipe_clk, HW may use suspend_clk
for function, as suspend_clk is slow so EP command need more time to
complete, e.g, imx8M suspend_clk is 32K, set ep configuration will
take about 380us per below trace time stamp(44.286278 - 44.285897
= 0.000381):

configfs_acm.sh-822 [000] d..1 44.285896: dwc3_writel: addr
000000006d59aae1 value 00000401
configfs_acm.sh-822 [000] d..1 44.285897: dwc3_readl: addr
000000006d59aae1 value 00000401
... ...
configfs_acm.sh-822 [000] d..1 44.286278: dwc3_readl: addr
000000006d59aae1 value 00000001
configfs_acm.sh-822 [000] d..1 44.286279: dwc3_gadget_ep_cmd:
ep0out: cmd 'Set Endpoint Configuration' [401] params 00001000
00000500 00000000 --> status: Successful

This was originally found on Hisilicon Kirin Soc that need more time
for the device controller to clear the CmdAct of DEPCMD.

Signed-off-by: Yu Chen <chenyu56@huawei.com>
Signed-off-by: John Stultz <john.stultz@linaro.org>
Signed-off-by: Li Jun <jun.li@nxp.com>
Signed-off-by: Felipe Balbi <balbi@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/usb/dwc3/gadget.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/usb/dwc3/gadget.c b/drivers/usb/dwc3/gadget.c
index 4149d751719e3..4a42368734644 100644
--- a/drivers/usb/dwc3/gadget.c
+++ b/drivers/usb/dwc3/gadget.c
@@ -276,7 +276,7 @@ int dwc3_send_gadget_ep_cmd(struct dwc3_ep *dep, unsigned cmd,
{
const struct usb_endpoint_descriptor *desc = dep->endpoint.desc;
struct dwc3 *dwc = dep->dwc;
- u32 timeout = 1000;
+ u32 timeout = 5000;
u32 saved_config = 0;
u32 reg;

--
2.25.1