From: John Youn Date: Mon, 15 Feb 2016 23:30:20 +0000 (-0800) Subject: usb: dwc2: Add extra delay when forcing dr_mode X-Git-Tag: v4.5-rc6~6^2^2~12 X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=bd84f4ae9986ac9acd278566ccb39c60bc961abb;p=karo-tx-linux.git usb: dwc2: Add extra delay when forcing dr_mode Fixes an issue found on rockchip rk3036 and rk3188 SOC platforms. For some reason, the existing msleep(25) is not enough after the force mode. The following patch was reported to fix the issue. This does increase the probe delay again slightly, but not up to the level it was before the original series of patches that this fixes. It does not cause any other issues when tested on Synopsys HAPS and Altera socfpga platforms. Need to revisit this series next release to see if we can address these issues without having an unconditional delay. Fixes: 09c96980dc72 ("usb: dwc2: Add functions to set and clear force mode") Reported-by: Caesar Wang Reported-by: Michael Niewoehner Tested-by: Heiko Stuebner Tested-by: Caesar Wang Signed-off-by: John Youn Signed-off-by: Felipe Balbi --- diff --git a/drivers/usb/dwc2/core.c b/drivers/usb/dwc2/core.c index e991d55914db..46c4ba75dc2a 100644 --- a/drivers/usb/dwc2/core.c +++ b/drivers/usb/dwc2/core.c @@ -619,6 +619,12 @@ void dwc2_force_dr_mode(struct dwc2_hsotg *hsotg) __func__, hsotg->dr_mode); break; } + + /* + * NOTE: This is required for some rockchip soc based + * platforms. + */ + msleep(50); } /*