From mboxrd@z Thu Jan 1 00:00:00 1970 From: Thierry Reding Subject: Re: [PATCH 2/3] usb: xhci: tegra: Add runtime PM support Date: Fri, 9 Mar 2018 09:36:29 +0100 Message-ID: <20180309083629.GA13877@ulmo> References: <1518626085-29102-1-git-send-email-jonathanh@nvidia.com> <1518626085-29102-2-git-send-email-jonathanh@nvidia.com> <54bd00b7-2835-a253-0399-370e8c8203b8@linux.intel.com> Mime-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha256; protocol="application/pgp-signature"; boundary="gBBFr7Ir9EOA20Yy" Return-path: Content-Disposition: inline In-Reply-To: Sender: linux-kernel-owner@vger.kernel.org To: Jon Hunter Cc: Mathias Nyman , Mathias Nyman , Greg Kroah-Hartman , linux-usb@vger.kernel.org, linux-tegra@vger.kernel.org, linux-kernel@vger.kernel.org List-Id: linux-tegra@vger.kernel.org --gBBFr7Ir9EOA20Yy Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Thu, Mar 08, 2018 at 09:31:07PM +0000, Jon Hunter wrote: >=20 > On 01/03/18 14:18, Mathias Nyman wrote: > > On 14.02.2018 18:34, Jon Hunter wrote: > >> Add runtime PM support to the Tegra XHCI driver and move the function > >> calls to enable/disable the clocks, regulators and PHY into the runtime > >> PM callbacks. > >> > >> Signed-off-by: Jon Hunter > >> --- > >> =C2=A0 drivers/usb/host/xhci-tegra.c | 80 > >> ++++++++++++++++++++++++++++++------------- > >> =C2=A0 1 file changed, 56 insertions(+), 24 deletions(-) > >> > >> diff --git a/drivers/usb/host/xhci-tegra.c > >> b/drivers/usb/host/xhci-tegra.c > >> index 02b0b24faa58..42aa67858b53 100644 > >> --- a/drivers/usb/host/xhci-tegra.c > >> +++ b/drivers/usb/host/xhci-tegra.c > >> @@ -18,6 +18,7 @@ > >> =C2=A0 #include > >> =C2=A0 #include > >> =C2=A0 #include > >> +#include > >> =C2=A0 #include > >> =C2=A0 #include > >> =C2=A0 #include > >> @@ -1067,22 +1068,12 @@ static int tegra_xusb_probe(struct > >> platform_device *pdev) > >> =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 */ > >> =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 platform_set_drvdata(pdev, tegra); > >> =C2=A0 -=C2=A0=C2=A0=C2=A0 err =3D tegra_xusb_clk_enable(tegra); > >> -=C2=A0=C2=A0=C2=A0 if (err) { > >> -=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 dev_err(&pdev->dev, "faile= d to enable clocks: %d\n", err); > >> -=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 goto put_usb2; > >> -=C2=A0=C2=A0=C2=A0 } > >> - > >> -=C2=A0=C2=A0=C2=A0 err =3D regulator_bulk_enable(tegra->soc->num_supp= lies, > >> tegra->supplies); > >> -=C2=A0=C2=A0=C2=A0 if (err) { > >> -=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 dev_err(&pdev->dev, "faile= d to enable regulators: %d\n", err); > >> -=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 goto disable_clk; > >> -=C2=A0=C2=A0=C2=A0 } > >> +=C2=A0=C2=A0=C2=A0 pm_runtime_enable(&pdev->dev); > >> =C2=A0 -=C2=A0=C2=A0=C2=A0 err =3D tegra_xusb_phy_enable(tegra); > >> +=C2=A0=C2=A0=C2=A0 err =3D pm_runtime_get_sync(&pdev->dev); > >> =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 if (err < 0) { > >=20 > > Does this mean that if runtime PM is disabled then clocks and regulator > > will never be enabled > > for Tegra xhci? > >=20 > > How about keeping the clock and regualtor enabling in probe, and instead > > add something like: > >=20 > > pm_runtime_set_active(&pdev->dev); > > pm_runtime_enable(&pdev->dev); > > pm_runtime_get_noresume(&pdev->dev); >=20 > For 64-bit Tegra there is a dependency on CONFIG_PM, but for 32-bit > AFAIK there is not and so yes we should handle the case when PM_RUNTIME > is disabled. >=20 > Typically we do something like ... >=20 > pm_runtime_enable(&pdev->dev); > if (!pm_runtime_enabled(&pdev->dev)) > ret =3D tegra_xusb_runtime_resume(&pdev->dev); > else > ret =3D pm_runtime_get_sync(&pdev->dev); >=20 > That way we can keep the regulator and clock stuff in the handler. I > will update this series. Is there any good reason why we don't depend on PM for 32-bit as well? I'm not aware of any differences in drivers that are 32-bit specific for Tegra, and I'm not even sure the !PM case gets any testing at all. And even if, do we really still want to support that? I don't see any advantage these days for having it disabled. 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charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: base64 Subject: [2/3] usb: xhci: tegra: Add runtime PM support From: Thierry Reding Message-Id: <20180309083629.GA13877@ulmo> Date: Fri, 9 Mar 2018 09:36:29 +0100 To: Jon Hunter Cc: Mathias Nyman , Mathias Nyman , Greg Kroah-Hartman , linux-usb@vger.kernel.org, linux-tegra@vger.kernel.org, linux-kernel@vger.kernel.org List-ID: T24gVGh1LCBNYXIgMDgsIDIwMTggYXQgMDk6MzE6MDdQTSArMDAwMCwgSm9uIEh1bnRlciB3cm90 ZToKPiAKPiBPbiAwMS8wMy8xOCAxNDoxOCwgTWF0aGlhcyBOeW1hbiB3cm90ZToKPiA+IE9uIDE0 LjAyLjIwMTggMTg6MzQsIEpvbiBIdW50ZXIgd3JvdGU6Cj4gPj4gQWRkIHJ1bnRpbWUgUE0gc3Vw cG9ydCB0byB0aGUgVGVncmEgWEhDSSBkcml2ZXIgYW5kIG1vdmUgdGhlIGZ1bmN0aW9uCj4gPj4g Y2FsbHMgdG8gZW5hYmxlL2Rpc2FibGUgdGhlIGNsb2NrcywgcmVndWxhdG9ycyBhbmQgUEhZIGlu dG8gdGhlIHJ1bnRpbWUKPiA+PiBQTSBjYWxsYmFja3MuCj4gPj4KPiA+PiBTaWduZWQtb2ZmLWJ5 OiBKb24gSHVudGVyIDxqb25hdGhhbmhAbnZpZGlhLmNvbT4KPiA+PiAtLS0KPiA+PiDCoCBkcml2 ZXJzL3VzYi9ob3N0L3hoY2ktdGVncmEuYyB8IDgwCj4gPj4gKysrKysrKysrKysrKysrKysrKysr KysrKysrKysrLS0tLS0tLS0tLS0tLQo+ID4+IMKgIDEgZmlsZSBjaGFuZ2VkLCA1NiBpbnNlcnRp b25zKCspLCAyNCBkZWxldGlvbnMoLSkKPiA+Pgo+ID4+IGRpZmYgLS1naXQgYS9kcml2ZXJzL3Vz Yi9ob3N0L3hoY2ktdGVncmEuYwo+ID4+IGIvZHJpdmVycy91c2IvaG9zdC94aGNpLXRlZ3JhLmMK PiA+PiBpbmRleCAwMmIwYjI0ZmFhNTguLjQyYWE2Nzg1OGI1MyAxMDA2NDQKPiA+PiAtLS0gYS9k cml2ZXJzL3VzYi9ob3N0L3hoY2ktdGVncmEuYwo+ID4+ICsrKyBiL2RyaXZlcnMvdXNiL2hvc3Qv eGhjaS10ZWdyYS5jCj4gPj4gQEAgLTE4LDYgKzE4LDcgQEAKPiA+PiDCoCAjaW5jbHVkZSA8bGlu dXgvcGh5L3RlZ3JhL3h1c2IuaD4KPiA+PiDCoCAjaW5jbHVkZSA8bGludXgvcGxhdGZvcm1fZGV2 aWNlLmg+Cj4gPj4gwqAgI2luY2x1ZGUgPGxpbnV4L3BtLmg+Cj4gPj4gKyNpbmNsdWRlIDxsaW51 eC9wbV9ydW50aW1lLmg+Cj4gPj4gwqAgI2luY2x1ZGUgPGxpbnV4L3JlZ3VsYXRvci9jb25zdW1l ci5oPgo+ID4+IMKgICNpbmNsdWRlIDxsaW51eC9yZXNldC5oPgo+ID4+IMKgICNpbmNsdWRlIDxs aW51eC9zbGFiLmg+Cj4gPj4gQEAgLTEwNjcsMjIgKzEwNjgsMTIgQEAgc3RhdGljIGludCB0ZWdy YV94dXNiX3Byb2JlKHN0cnVjdAo+ID4+IHBsYXRmb3JtX2RldmljZSAqcGRldikKPiA+PiDCoMKg wqDCoMKgwqAgKi8KPiA+PiDCoMKgwqDCoMKgIHBsYXRmb3JtX3NldF9kcnZkYXRhKHBkZXYsIHRl Z3JhKTsKPiA+PiDCoCAtwqDCoMKgIGVyciA9IHRlZ3JhX3h1c2JfY2xrX2VuYWJsZSh0ZWdyYSk7 Cj4gPj4gLcKgwqDCoCBpZiAoZXJyKSB7Cj4gPj4gLcKgwqDCoMKgwqDCoMKgIGRldl9lcnIoJnBk ZXYtPmRldiwgImZhaWxlZCB0byBlbmFibGUgY2xvY2tzOiAlZFxuIiwgZXJyKTsKPiA+PiAtwqDC oMKgwqDCoMKgwqAgZ290byBwdXRfdXNiMjsKPiA+PiAtwqDCoMKgIH0KPiA+PiAtCj4gPj4gLcKg wqDCoCBlcnIgPSByZWd1bGF0b3JfYnVsa19lbmFibGUodGVncmEtPnNvYy0+bnVtX3N1cHBsaWVz LAo+ID4+IHRlZ3JhLT5zdXBwbGllcyk7Cj4gPj4gLcKgwqDCoCBpZiAoZXJyKSB7Cj4gPj4gLcKg wqDCoMKgwqDCoMKgIGRldl9lcnIoJnBkZXYtPmRldiwgImZhaWxlZCB0byBlbmFibGUgcmVndWxh dG9yczogJWRcbiIsIGVycik7Cj4gPj4gLcKgwqDCoMKgwqDCoMKgIGdvdG8gZGlzYWJsZV9jbGs7 Cj4gPj4gLcKgwqDCoCB9Cj4gPj4gK8KgwqDCoCBwbV9ydW50aW1lX2VuYWJsZSgmcGRldi0+ZGV2 KTsKPiA+PiDCoCAtwqDCoMKgIGVyciA9IHRlZ3JhX3h1c2JfcGh5X2VuYWJsZSh0ZWdyYSk7Cj4g Pj4gK8KgwqDCoCBlcnIgPSBwbV9ydW50aW1lX2dldF9zeW5jKCZwZGV2LT5kZXYpOwo+ID4+IMKg wqDCoMKgwqAgaWYgKGVyciA8IDApIHsKPiA+IAo+ID4gRG9lcyB0aGlzIG1lYW4gdGhhdCBpZiBy dW50aW1lIFBNIGlzIGRpc2FibGVkIHRoZW4gY2xvY2tzIGFuZCByZWd1bGF0b3IKPiA+IHdpbGwg bmV2ZXIgYmUgZW5hYmxlZAo+ID4gZm9yIFRlZ3JhIHhoY2k/Cj4gPiAKPiA+IEhvdyBhYm91dCBr ZWVwaW5nIHRoZSBjbG9jayBhbmQgcmVndWFsdG9yIGVuYWJsaW5nIGluIHByb2JlLCBhbmQgaW5z dGVhZAo+ID4gYWRkIHNvbWV0aGluZyBsaWtlOgo+ID4gCj4gPiBwbV9ydW50aW1lX3NldF9hY3Rp dmUoJnBkZXYtPmRldik7Cj4gPiBwbV9ydW50aW1lX2VuYWJsZSgmcGRldi0+ZGV2KTsKPiA+IHBt X3J1bnRpbWVfZ2V0X25vcmVzdW1lKCZwZGV2LT5kZXYpOwo+IAo+IEZvciA2NC1iaXQgVGVncmEg dGhlcmUgaXMgYSBkZXBlbmRlbmN5IG9uIENPTkZJR19QTSwgYnV0IGZvciAzMi1iaXQKPiBBRkFJ SyB0aGVyZSBpcyBub3QgYW5kIHNvIHllcyB3ZSBzaG91bGQgaGFuZGxlIHRoZSBjYXNlIHdoZW4g UE1fUlVOVElNRQo+IGlzIGRpc2FibGVkLgo+IAo+IFR5cGljYWxseSB3ZSBkbyBzb21ldGhpbmcg bGlrZSAuLi4KPiAKPiAgICAgcG1fcnVudGltZV9lbmFibGUoJnBkZXYtPmRldik7Cj4gICAgIGlm ICghcG1fcnVudGltZV9lbmFibGVkKCZwZGV2LT5kZXYpKQo+IAlyZXQgPSB0ZWdyYV94dXNiX3J1 bnRpbWVfcmVzdW1lKCZwZGV2LT5kZXYpOwo+ICAgICBlbHNlCj4gICAgICAgICByZXQgPSBwbV9y dW50aW1lX2dldF9zeW5jKCZwZGV2LT5kZXYpOwo+IAo+IFRoYXQgd2F5IHdlIGNhbiBrZWVwIHRo ZSByZWd1bGF0b3IgYW5kIGNsb2NrIHN0dWZmIGluIHRoZSBoYW5kbGVyLiBJCj4gd2lsbCB1cGRh dGUgdGhpcyBzZXJpZXMuCgpJcyB0aGVyZSBhbnkgZ29vZCByZWFzb24gd2h5IHdlIGRvbid0IGRl cGVuZCBvbiBQTSBmb3IgMzItYml0IGFzIHdlbGw/CkknbSBub3QgYXdhcmUgb2YgYW55IGRpZmZl cmVuY2VzIGluIGRyaXZlcnMgdGhhdCBhcmUgMzItYml0IHNwZWNpZmljIGZvcgpUZWdyYSwgYW5k IEknbSBub3QgZXZlbiBzdXJlIHRoZSAhUE0gY2FzZSBnZXRzIGFueSB0ZXN0aW5nIGF0IGFsbC4g QW5kCmV2ZW4gaWYsIGRvIHdlIHJlYWxseSBzdGlsbCB3YW50IHRvIHN1cHBvcnQgdGhhdD8KCkkg ZG9uJ3Qgc2VlIGFueSBhZHZhbnRhZ2UgdGhlc2UgZGF5cyBmb3IgaGF2aW5nIGl0IGRpc2FibGVk LgoKVGhpZXJyeQo=