From: Minas Harutyunyan <Minas.Harutyunyan@synopsys.com>
To: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com>,
Marek Szyprowski <m.szyprowski@samsung.com>,
"linux-usb@vger.kernel.org" <linux-usb@vger.kernel.org>,
"linux-samsung-soc@vger.kernel.org"
<linux-samsung-soc@vger.kernel.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
Cc: Felipe Balbi <felipe.balbi@linux.intel.com>,
Artur Petrosyan <Arthur.Petrosyan@synopsys.com>,
Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
Subject: Re: [PATCH] usb: dwc2: Skip clock gating on Samsung SoCs
Date: Fri, 16 Jul 2021 09:07:25 +0000 [thread overview]
Message-ID: <6fb5313e-b2c0-7b3e-84f7-6333216f4292@synopsys.com> (raw)
In-Reply-To: <e2fc4d3f-2f64-1d7e-5816-0275da23d6fa@canonical.com>
Hi Krzysztof,
On 7/16/2021 12:10 PM, Krzysztof Kozlowski wrote:
> On 16/07/2021 07:01, Marek Szyprowski wrote:
>> Commit 0112b7ce68ea ("usb: dwc2: Update dwc2_handle_usb_suspend_intr
>> function.") changed the way the driver handles power down modes in a such
>> way that it uses clock gating when no other power down mode is available.
>>
>> This however doesn't work well on the DWC2 implementation used on the
>> Samsung SoCs. When a clock gating is enabled, system hangs. It looks that
>> the proper clock gating requires some additional glue code in the shared
>> USB2 PHY and/or Samsung glue code for the DWC2. To restore driver
>> operation on the Samsung SoCs simply skip enabling clock gating mode
>> until one finds what is really needed to make it working reliably.
>>
>> Fixes: 0112b7ce68ea ("usb: dwc2: Update dwc2_handle_usb_suspend_intr function.")
>> Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
>> ---
>> drivers/usb/dwc2/core.h | 4 ++++
>> drivers/usb/dwc2/core_intr.c | 3 ++-
>> drivers/usb/dwc2/hcd.c | 6 ++++--
>> drivers/usb/dwc2/params.c | 1 +
>> 4 files changed, 11 insertions(+), 3 deletions(-)
>>
>
>
> Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com>
>
What mean your "Acked-by" tag? Do you want to mention that this commit
"Tested-by" or "Reviewed-by" by you?
Thanks,
Minas
>
> Best regards,
> Krzysztof
>
next prev parent reply other threads:[~2021-07-16 9:07 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <CGME20210716050132eucas1p285949f9a73764b173c29ad0fa8502f23@eucas1p2.samsung.com>
2021-07-16 5:01 ` [PATCH] usb: dwc2: Skip clock gating on Samsung SoCs Marek Szyprowski
2021-07-16 8:10 ` Krzysztof Kozlowski
2021-07-16 9:07 ` Minas Harutyunyan [this message]
2021-07-16 9:12 ` Krzysztof Kozlowski
2021-07-16 14:54 ` Minas Harutyunyan
2021-08-03 9:40 ` Marek Szyprowski
2021-08-03 10:08 ` Minas Harutyunyan
2021-08-04 11:29 ` Marek Szyprowski
2021-08-04 17:19 ` Minas Harutyunyan
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