Re: [PATCH v2 1/8] usb: phy: tegra: Add delay after power up
From: Thierry Reding
Date: Thu Dec 17 2020 - 08:26:33 EST
On Thu, Dec 17, 2020 at 12:40:00PM +0300, Dmitry Osipenko wrote:
> The PHY hardware needs the delay of 2ms after power up, otherwise initial
> interrupt may be lost if USB controller is accessed before PHY is settled
> down. Previously this issue was masked by implicit delays, but now it pops
> up after squashing the older ehci-tegra driver into the ChipIdea driver.
>
> Tested-by: Matt Merhar <mattmerhar@xxxxxxxxxxxxxx>
> Tested-by: Nicolas Chauvet <kwizart@xxxxxxxxx>
> Tested-by: Peter Geis <pgwipeout@xxxxxxxxx>
> Tested-by: Ion Agorria <ion@xxxxxxxxxxx>
> Signed-off-by: Dmitry Osipenko <digetx@xxxxxxxxx>
> ---
> drivers/usb/phy/phy-tegra-usb.c | 3 +++
> 1 file changed, 3 insertions(+)
Acked-by: Thierry Reding <treding@xxxxxxxxxx>
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