linux-kernel - Re: [PATCH] phy: lantiq: rcu-usb2: wait after clock enable

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Message-ID: <20210113135919.GO2771@vkoul-mobl>
Date:   Wed, 13 Jan 2021 19:29:19 +0530
From:   Vinod Koul <vkoul@...nel.org>
To:     Mathias Kresin <dev@...sin.me>
Cc:     Kishon Vijay Abraham I <kishon@...com>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        linux-kernel@...r.kernel.org,
        Martin Blumenstingl <martin.blumenstingl@...glemail.com>,
        Hauke Mehrtens <hauke@...ke-m.de>, stable@...r.kernel.org
Subject: Re: [PATCH] phy: lantiq: rcu-usb2: wait after clock enable

On 07-01-21, 23:49, Mathias Kresin wrote:
> Commit 65dc2e725286 ("usb: dwc2: Update Core Reset programming flow.")
> revealed that the phy isn't ready immediately after enabling it's
> clocks. The dwc2_check_core_version() fails and the dwc2 usb driver
> errors out.
> 
> Add a short delay to let the phy get up and running. There isn't any
> documentation how much time is required, the value was chosen based on
> tests.

Applied, thanks

-- 
~Vinod