From: Sandeep Maheswaram <quic_c_sanm@quicinc.com>
To: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Felipe Balbi <balbi@kernel.org>,
Stephen Boyd <swboyd@chromium.org>,
"Doug Anderson" <dianders@chromium.org>,
Matthias Kaehlcke <mka@chromium.org>,
Mathias Nyman <mathias.nyman@intel.com>,
<linux-arm-msm@vger.kernel.org>, <linux-usb@vger.kernel.org>,
<linux-kernel@vger.kernel.org>, <quic_pkondeti@quicinc.com>,
<quic_ppratap@quicinc.com>
Subject: Re: [PATCH v5] usb: host: xhci-plat: Set XHCI_SKIP_PHY_INIT quirk for DWC3 controller
Date: Thu, 27 Jan 2022 10:28:52 +0530 [thread overview]
Message-ID: <f45f5952-e31c-5e9d-2560-064199beb29f@quicinc.com> (raw)
In-Reply-To: <YfE9s06CIv1P3bA/@kroah.com>
On 1/26/2022 5:55 PM, Greg Kroah-Hartman wrote:
> On Fri, Jan 07, 2022 at 10:27:59AM +0530, Sandeep Maheswaram wrote:
>> On 1/6/2022 7:55 PM, Greg Kroah-Hartman wrote:
>>> On Wed, Dec 22, 2021 at 11:39:43AM +0530, Sandeep Maheswaram wrote:
>>>> Set XHCI_SKIP_PHY_INIT quirk to avoid phy initialization twice.
>>>> Runtime suspend of phy drivers was failing from DWC3 driver as runtime
>>>> usage value is 2 because the phy is initialized from DWC3 and HCD core.
>>>> DWC3 manages phy in their core drivers. Set this quirk to avoid phy
>>>> initialization in HCD core.
>>>>
>>>> Signed-off-by: Sandeep Maheswaram <quic_c_sanm@quicinc.com>
>>>> ---
>>>> v5:
>>>> Added comment to explain the change done.
>>>> v4:
>>>> Changed pdev->dev.parent->of_node to sysdev->of_node
>>>>
>>>> drivers/usb/host/xhci-plat.c | 8 ++++++++
>>>> 1 file changed, 8 insertions(+)
>>>>
>>>> diff --git a/drivers/usb/host/xhci-plat.c b/drivers/usb/host/xhci-plat.c
>>>> index c1edcc9..e6014d4 100644
>>>> --- a/drivers/usb/host/xhci-plat.c
>>>> +++ b/drivers/usb/host/xhci-plat.c
>>>> @@ -327,6 +327,14 @@ static int xhci_plat_probe(struct platform_device *pdev)
>>>> &xhci->imod_interval);
>>>> }
>>>> + /*
>>>> + * Set XHCI_SKIP_PHY_INIT quirk to avoid phy initialization twice.
>>>> + * DWC3 manages phy in their core drivers. Set this quirk to avoid phy
>>>> + * initialization in HCD core.
>>>> + */
>>>> + if (of_device_is_compatible(sysdev->of_node, "snps,dwc3"))
>>>> + xhci->quirks |= XHCI_SKIP_PHY_INIT;
>>>> +
>>> Why is this function caring about dwc3 stuff? Shoudn't this be a
>>> "generic" device property instead of this device-specific one?
>>>
>>> thanks,
>>>
>>> greg k-h
>> This quirk is set only if required for some controllers (eg: dwc3 & cdns3).
>>
>> Please check below commit.
>>
>> https://lore.kernel.org/all/20200918131752.16488-5-mathias.nyman@linux.intel.com/
> That commit has nothing to do with a specific "dwc3" quirk anywhere.
> Why not set this flag in the specific platform xhci driver instead where
> it belongs?
>
> thanks,
>
> greg k-h
There is no specific xhci platform driver for dwc3 controllers.
dwc3 controllers use xhci-plat driver .
We can add this quirk in usb/dwc3/host.c as cdns3 does but that requires
tying dwc3 and xhci driver .
https://patchwork.kernel.org/project/linux-arm-msm/patch/1633946518-13906-1-git-send-email-sanm@codeaurora.org/
Regards
Sandeep
next prev parent reply other threads:[~2022-01-27 4:59 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-12-22 6:09 [PATCH v5] usb: host: xhci-plat: Set XHCI_SKIP_PHY_INIT quirk for DWC3 controller Sandeep Maheswaram
2022-01-06 14:25 ` Greg Kroah-Hartman
2022-01-07 4:57 ` Sandeep Maheswaram
2022-01-24 5:31 ` Sandeep Maheswaram
2022-01-24 6:21 ` Greg Kroah-Hartman
2022-01-26 12:25 ` Greg Kroah-Hartman
2022-01-27 4:58 ` Sandeep Maheswaram [this message]
2022-02-08 10:04 ` Sandeep Maheswaram
2022-02-08 10:11 ` Greg Kroah-Hartman
2022-02-09 5:53 ` Pavan Kondeti
2022-02-09 6:01 ` Sandeep Maheswaram
[not found] ` <825a62d8-dc09-fed1-7e33-00d2192a91d5@quicinc.com>
2022-02-10 6:41 ` Pavan Kondeti
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=f45f5952-e31c-5e9d-2560-064199beb29f@quicinc.com \
--to=quic_c_sanm@quicinc.com \
--cc=balbi@kernel.org \
--cc=dianders@chromium.org \
--cc=gregkh@linuxfoundation.org \
--cc=linux-arm-msm@vger.kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-usb@vger.kernel.org \
--cc=mathias.nyman@intel.com \
--cc=mka@chromium.org \
--cc=quic_pkondeti@quicinc.com \
--cc=quic_ppratap@quicinc.com \
--cc=swboyd@chromium.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).