From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754028AbeEaHYH (ORCPT ); Thu, 31 May 2018 03:24:07 -0400 Received: from fllnx210.ext.ti.com ([198.47.19.17]:38321 "EHLO fllnx210.ext.ti.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753846AbeEaHYB (ORCPT ); Thu, 31 May 2018 03:24:01 -0400 Subject: Re: [PATCH 2/2] usb: dwc3: of_simple: don't call pm_runtime_set_active() To: Felipe Balbi , Tero Kristo , "Gerlach, Dave" CC: , , Nishanth Menon , "Nori, Sekhar" References: <1527518174-27860-1-git-send-email-rogerq@ti.com> <1527518174-27860-2-git-send-email-rogerq@ti.com> <87k1rlcok2.fsf@linux.intel.com> From: Roger Quadros Openpgp: preference=signencrypt Autocrypt: addr=rogerq@ti.com; prefer-encrypt=mutual; keydata= xsFNBFT1lPYBEADZlKgOS2lxNkDRlcROza/QPsYrS+V2YAXOd4rO/sshQDt1OgU4E8DD37t0 F4zipBkMVU1nQ6ZSomg2o9w17wD7sL0wNO+QZ0j5V2yy2SJIlK70lgmz90GlL93V3T/BFJNr YdtC6FBWvczrXXz6qIKq+3s9j+gMx4CFsZX8vq35xcsaNdyWzX2J7hqMKQ+vYuLvy3u2UMIc pgkwfx5CHXHmWVr4/qWPB+O9YtN9m1ezfPLwbZ73Ea5LpnvCGO6s4IHFLl2hPpDGUCHHV/1N qg3N5ztm4bhN9C0+1qdmhuFGhkfC3O4h/ncywTUNuxqk2Tux19GX3BeWiJF7QVVJb2iXttdo Zi44vp32I7LbcMcXYifHHGYwS5GeAudx6O19RTS+D7XQ1BkSmw8weaTleLhJwApVBon2KziB NscqXsj6CdKFwLFsDPkkvYCsEpWz3C9UUn8veOna2STk8oyk1GM+iVarBad6gs0n8NFNrR2n nLjIFuZ6GIwec3HNaX5Zk3ap1z7qsZ/BVou8r95FJw7cAQU3H5vgHZkGHy9xl6LmPvAf0tWT sO1a9mbf7gcC2u4ccHJ+hTvGk62/E/+AxbtzUDQI0D2ouS9DnwO92UZDJrJhj6m3u1c8mR45 W2CFvZSVPmDSxbyWm3ADzsjfRQlhLkzsV9BoDq8uRMzWUPd8IQARAQABzTRSb2dlciBRdWFk cm9zIChLZXkgZm9yIExpbnV4IGtlcm5lbCkgPHJvZ2VycUB0aS5jb20+wsF4BBMBAgAiBQJU 9ZT2AhsDBgsJCAcDAgYVCAIJCgsEFgIDAQIeAQIXgAAKCRDSWmvTvnYwkwP2EACuDMmuKaYm rcMhjVcvrrWF7n1LGI4nrmVH93fAI8wZsLSpUwyHeLGNTwSOvJC6U4qLvJAejttdW/DCvU+8 cETqkeh36IQhvxNdp6HGXPD+hywZiDHZi54mfpLU7DTExGyuyKKbh7leH/5QvhZF/NkEXHIC g9caDvnmg0CI5VI6QsleiQPNFL7VYZ3neGKJRHjUGTbKPc/9InqzTCWH7ZI3W0aZoAFrOOYv 4bWSohSruEEYKwE6ebvflwESOj5ikVJY5cPmscYfR6LIBzXtTL4fg296sqkeNtvU99DMjKGX LTKmxPY5lnPkDY1YJbAJKoQ+8DYB5GnXA3CNscgXDQGIwbq2eKlGgLhMjyDVmjGHB0FOuuFQ 6W+PLP0FfYqQdQwJWbPfvXoku3IlljwxAN+gvzi0xD3Yqpl3VDjbn2n/2aRuqa8pVVCrsUnG 4LeoDJeMIHyddK61HXDhN0SoA4RNLm6ZW8E+2DH8ZbFbw8IkSyh9Op01LMzD9tr47JRcrGgv K4o1QOwSe1NIK7yQ/SrENiMvICTeAq4gqvc/maDWbylNsYZc3VO9VAhCCghbdk7kRfYWhzBg C/2RgkMGBBTAOVgMbPcDpFzD5Dukg+Jy4xn97bA/MSH8CyYcLZos0SaSzrjNVIvm+TN71k9+ Q2EhsrlhWj64+IjYmzVIFHyTmc7BTQRU9ZT2ARAA16PDhYuCNxXwcXAPlgpVIXC5ZxvB3xWK QifhimnqxvJsCNkNWt8I3jfY+GwjsjTldzA4jIbHTuaHhXgMMu9YoUVK/YBp5IZ/NiQ3yVL5 K5XU0q/BtG30yox9CPjWCA7OmT3mF+1vT9UrEEPCs8KpWER5ajk+rQpTc1WuwJqBB5WeIlZJ odjxuL3r1Zpgk7LxPwwaw15WutKPFY8ClvXqlmmkU4zlCC5s4oR39f6E6B31yun621fvgu8X LFY4i7aUkVYUleKd7L/GAV98Dnbrop48bQM+gDtyPODPh8fJylsPvZAYEqiapSsYiHvts3r/ nEw0RASNyjp5pNBWb5/JbBjboKhGCoBJzkDHcr5VbeOXuemymJHqgysbmDZY415olIOrYQGT b9p/zg5U/eGFsxKnAe4LquX9oAoEu6K/zkUbA/1LEjSTxu3xGCczxe2ZsKthdYztDkntsw+t U9bt2DCXhmabMCcYS1YP72ZVITpLk4qRfxcrtzgx/uGfuMZDuN7JVYqCz7AI+xEQBLlQWXhL cJ8dH0d+H/3Zs9LVaJAqoc9CiYo1yz8NUH+yHGxz437ccUic8HPB2lIiL/W6C4wVhUbm2w9F 4VdByWgWCCY5Ynhe188sqNL+mFqLAaIssqyYwTBJM+Go6tOuRnP6jrkf2Va/pIwIltzf9QOW cgEAEQEAAcLBXwQYAQIACQUCVPWU9gIbDAAKCRDSWmvTvnYwk8niEACcwBAfe1tTSqCCHkRj zgIrt+NPBBfxilf9JXPGTYqfUkrcVfiNqLGFgIDZKjkLfArxiSmpmtKf1O1VYO9XDgADUKJO RvmUQM/l3Q99QC5b8yUyZOsgfSBOsV6DeqiULO30cXH/uEpR2fUcbtyYXHouiF2UNdq/BV5h HBQkGYtTf7K26NPp4wXMS+YsBm2Gbms/wywJh4KgRPP6LuA+UE/7l0xqMD3pBQ/L1KLTqOQY CItcZ0YbEvlrJc25PRkCssHf1J2c2MXV+CRqsibW8UamBmOyzKHVK/CwvIndwBmcciJrOf+4 uxegvXEnwvYPuQ3wvBSkgbJRFNJemnp5KSczANr4R/aA5cEbxhbg7peLv0FdFyTFJXCsKeuO 1gKoKtOLyxRhDocprSuEamaDWDCy3TmX+6nWaBIPYXDFT7IcHT6l6TyZ6IMjkXiHSLhynTIj f2xjSrvKPljIUxcqjhyqWe+coe/Xwbqz69DsK150xoAaoS3rbNlhmalbg15HNTipNDI/k81A fwt7ncjxvjXVJnA2nqPBDIW3mZO/ED0blLrVdaMZjf5LvS+vvsMdH7dHtrAXA50egr74sX0A NO7iW+gkmFYwap531ipMXthHPWbo5x9xfb+a48xA80ePBJLBDyw9X+cOe40+N4Ybiwy5Q2La IwrfNkJOLj3CvocMIw== Message-ID: Date: Thu, 31 May 2018 10:23:57 +0300 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.8.0 MIME-Version: 1.0 In-Reply-To: <87k1rlcok2.fsf@linux.intel.com> Content-Type: text/plain; charset="utf-8" Content-Language: en-GB Content-Transfer-Encoding: 8bit X-EXCLAIMER-MD-CONFIG: e1e8a2fd-e40a-4ac6-ac9b-f7e9cc9ee180 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 30/05/18 15:31, Felipe Balbi wrote: > Roger Quadros writes: > >> Don't call pm_runtime_set_active() as it will prevent the device >> from being activated in the next pm_runtime_get_sync() call. >> >> Also call pm_runtime_get_sync() before of_platform_populate(). >> >> Signed-off-by: Roger Quadros > > This patch is wrong. > >> --- >> drivers/usb/dwc3/dwc3-of-simple.c | 7 +++---- >> 1 file changed, 3 insertions(+), 4 deletions(-) >> >> diff --git a/drivers/usb/dwc3/dwc3-of-simple.c b/drivers/usb/dwc3/dwc3-of-simple.c >> index e98d221..2cbb5c0 100644 >> --- a/drivers/usb/dwc3/dwc3-of-simple.c >> +++ b/drivers/usb/dwc3/dwc3-of-simple.c >> @@ -121,6 +121,9 @@ static int dwc3_of_simple_probe(struct platform_device *pdev) >> if (ret) >> goto err_resetc_assert; >> >> + pm_runtime_enable(dev); >> + pm_runtime_get_sync(dev); > > No, this is the wrong way to do things. My device should be enabled > already from probe, specially since I have already enabled clocks. As far as I understood just enabling clocks (which might not include bus clock) doesn't ensure device is enabled. Did you mean that I don't need to do a pm_runtime_get_sync() to enable my device in probe? Who is enabling by device for me then? Is device core supposed to do it? > >> ret = of_platform_populate(np, NULL, NULL, dev); >> if (ret) { >> for (i = 0; i < simple->num_clocks; i++) { >> @@ -131,10 +134,6 @@ static int dwc3_of_simple_probe(struct platform_device *pdev) >> goto err_resetc_assert; >> } >> >> - pm_runtime_set_active(dev); >> - pm_runtime_enable(dev); >> - pm_runtime_get_sync(dev); > > this hunk is not wrong at all. > The issue I was facing is that without this patch my device wasn't being enabled as pm_runtime_set_active() is being done _before_ pm_runtime_get_sync(). It could be an issue with the platform's PM domain code as well. Tero/Dave what do you think? -- cheers, -roger Texas Instruments Finland Oy, Porkkalankatu 22, 00180 Helsinki. Y-tunnus/Business ID: 0615521-4. Kotipaikka/Domicile: Helsinki