From: Jung Daehwan <dh10.jung@samsung.com>
To: Krzysztof Kozlowski <krzk@kernel.org>
Cc: Mathias Nyman <mathias.nyman@intel.com>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
"open list:USB XHCI DRIVER" <linux-usb@vger.kernel.org>,
open list <linux-kernel@vger.kernel.org>,
Howard Yen <howardyen@google.com>,
Jack Pham <jackp@codeaurora.org>, Puma Hsu <pumahsu@google.com>,
"J . Avila" <elavila@google.com>,
sc.suh@samsung.com,
Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com>
Subject: Re: [PATCH v4 5/5] usb: host: add xhci-exynos driver
Date: Thu, 28 Apr 2022 10:29:41 +0900 [thread overview]
Message-ID: <20220428012941.GF145620@ubuntu> (raw)
In-Reply-To: <a9438aef-78a3-e8ab-2b78-cc872447df08@kernel.org>
[-- Attachment #1: Type: text/plain, Size: 3264 bytes --]
On Tue, Apr 26, 2022 at 02:59:57PM +0200, Krzysztof Kozlowski wrote:
> On 26/04/2022 11:18, Daehwan Jung wrote:
> > This driver is for Samsung Exynos xhci host conroller. It uses xhci-plat
> > driver mainly and extends some functions by xhci hooks and overrides.
> >
> > It supports USB Audio offload with Co-processor. It only cares DCBAA,
> > Device Context, Transfer Ring, Event Ring, and ERST. They are allocated
> > on specific address with xhci hooks. Co-processor could use them directly
> > without xhci driver after then.
>
> This does not look like developed in current Linux kernel, but something
> out-of-tree, with some other unknown modifications. This is not how the
> code should be developed. Please rebase on linux-next and drop any
> unrelated modifications (these which are not sent with this patchset).
>
I've been developing on linux-next and I rebase before submitting.
Could you tell me one of dropped modifications or patches?
> (...)
>
> > +
> > +static int xhci_exynos_suspend(struct device *dev)
> > +{
> > + struct usb_hcd *hcd = dev_get_drvdata(dev);
> > + struct xhci_hcd *xhci = hcd_to_xhci(hcd);
> > +
> > + /* TODO: AP sleep scenario*/
>
> Shall the patchset be called RFC?
>
OK. I will add RFC for this patch on next submission.
> > +
> > + return xhci_suspend(xhci, device_may_wakeup(dev));
> > +}
> > +
> > +static int xhci_exynos_resume(struct device *dev)
> > +{
> > + struct usb_hcd *hcd = dev_get_drvdata(dev);
> > + struct xhci_hcd *xhci = hcd_to_xhci(hcd);
> > + int ret;
> > +
> > + /* TODO: AP resume scenario*/
> > +
> > + ret = xhci_resume(xhci, 0);
> > + if (ret)
> > + return ret;
> > +
> > + pm_runtime_disable(dev);
> > + pm_runtime_set_active(dev);
> > + pm_runtime_enable(dev);
> > +
> > + return 0;
> > +}
> > +
> > +static const struct dev_pm_ops xhci_exynos_pm_ops = {
> > + SET_SYSTEM_SLEEP_PM_OPS(xhci_exynos_suspend, xhci_exynos_resume)
> > +};
> > +
> > +MODULE_DESCRIPTION("xHCI Exynos Host Controller Driver");
> > +MODULE_LICENSE("GPL");
>
> You don't have list of compatibles (and missing bindings), driver
> definition, driver registration. Entire solution is not used - nothing
> calls xhci_exynos_vendor_init(), because nothign uses "ops".
>
xhci_exynos_vendor_init is called in xhci-plat.c (xhci_vendor_init)
[v4,2/5] usb: host: add xhci hooks for xhci-exynos
ops are used in some files(xhci-mem.c, xhci.c ..) and the body of ops is in
all xhci-exynos.
xhci-exynos is not a standalone driver. It could be enabled when other module
makes xhci platform driver probed as it uses xhci platform mainly.
I thought I just used existing compltible not adding new one.
I will add them if needed.
> This does not work and it makes it impossible to test it. Please provide
> proper XHCI Exynos driver, assuming you need it and it is not part of
> regular Exynos XHCI drivers (DWC3 and so on).
>
What makes you think it doesn't work? I think it's almost proper. I just removed
other IPs code like Co-Processor(we call it abox) or Power Management because
it would make build-error. I've added hooking points in some files(xhci-mem.c,
xhci.c..) and ops are implemented in xhci-exynos. It's mainly operated with
xhci platform driver.
Best Regards,
Jung Daehwan
> Best regards,
> Krzysztof
>
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next prev parent reply other threads:[~2022-04-28 1:31 UTC|newest]
Thread overview: 47+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <CGME20220426092019epcas2p2ef5dfde273edaaadc2ff74414f1b2c7a@epcas2p2.samsung.com>
2022-04-26 9:18 ` [PATCH v4 0/5] add xhci-exynos driver Daehwan Jung
[not found] ` <CGME20220426092021epcas2p4071f2b7621558a015579131990486a3c@epcas2p4.samsung.com>
2022-04-26 9:18 ` [PATCH v4 1/5] usb: host: export symbols for xhci-exynos to use xhci hooks Daehwan Jung
2022-04-26 9:54 ` Greg Kroah-Hartman
2022-04-26 10:27 ` Jung Daehwan
2022-04-26 10:31 ` Greg Kroah-Hartman
2022-04-26 18:40 ` Greg Kroah-Hartman
2022-04-28 3:30 ` Jung Daehwan
2022-04-26 16:02 ` kernel test robot
[not found] ` <CGME20220426092021epcas2p1a8d41039d9b3226f4e00f7d4bded833a@epcas2p1.samsung.com>
2022-04-26 9:18 ` [PATCH v4 2/5] usb: host: add xhci hooks for xhci-exynos Daehwan Jung
2022-04-26 10:19 ` Greg Kroah-Hartman
2022-04-27 9:06 ` Jung Daehwan
2022-04-27 9:19 ` Greg Kroah-Hartman
2022-04-28 3:23 ` Jung Daehwan
2022-04-28 5:30 ` Greg Kroah-Hartman
[not found] ` <CGME20220426092022epcas2p2da47c0c20feba6c96037e125289475f9@epcas2p2.samsung.com>
2022-04-26 9:18 ` [PATCH v4 3/5] usb: host: xhci-plat: support override of hc driver Daehwan Jung
2022-04-26 10:20 ` Greg Kroah-Hartman
2022-04-27 9:07 ` Jung Daehwan
[not found] ` <CGME20220426092022epcas2p2c016c83b21e41c7bcd4bdfbb95e464c0@epcas2p2.samsung.com>
2022-04-26 9:18 ` [PATCH v4 4/5] usb: host: add some to xhci overrides for xhci-exynos Daehwan Jung
2022-04-26 10:23 ` Greg Kroah-Hartman
2022-04-27 9:19 ` Jung Daehwan
2022-04-27 9:37 ` Greg Kroah-Hartman
[not found] ` <CGME20220426092023epcas2p32946c087135ca4b7e63b03915060c55d@epcas2p3.samsung.com>
2022-04-26 9:18 ` [PATCH v4 5/5] usb: host: add xhci-exynos driver Daehwan Jung
2022-04-26 10:20 ` Greg Kroah-Hartman
2022-04-28 3:26 ` Jung Daehwan
2022-04-26 10:21 ` Greg Kroah-Hartman
2022-04-27 9:24 ` Jung Daehwan
2022-04-27 9:37 ` Greg Kroah-Hartman
2022-04-26 12:59 ` Krzysztof Kozlowski
2022-04-28 1:29 ` Jung Daehwan [this message]
2022-04-28 5:19 ` Krzysztof Kozlowski
2022-04-28 6:36 ` Jung Daehwan
2022-04-28 6:45 ` Greg Kroah-Hartman
2022-04-28 7:45 ` Jung Daehwan
2022-04-28 7:31 ` Krzysztof Kozlowski
2022-04-28 7:53 ` Jung Daehwan
2022-04-28 8:26 ` Krzysztof Kozlowski
2022-04-26 17:55 ` kernel test robot
2022-04-27 16:25 ` Mathias Nyman
2022-04-28 3:03 ` Jung Daehwan
2022-04-28 12:28 ` Mathias Nyman
2022-05-03 8:41 ` Jung Daehwan
2022-04-28 5:15 ` Jung Daehwan
2022-04-26 10:19 ` [PATCH v4 0/5] " Greg Kroah-Hartman
2022-04-26 12:46 ` Krzysztof Kozlowski
2022-04-27 9:49 ` Jung Daehwan
2022-04-27 18:24 ` Krzysztof Kozlowski
2022-04-28 3:19 ` Jung Daehwan
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