From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756947AbaEIOys (ORCPT ); Fri, 9 May 2014 10:54:48 -0400 Received: from mezzanine.sirena.org.uk ([106.187.55.193]:39344 "EHLO mezzanine.sirena.org.uk" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756928AbaEIOyp (ORCPT ); Fri, 9 May 2014 10:54:45 -0400 Date: Fri, 9 May 2014 15:54:25 +0100 From: Mark Brown To: Naveen Krishna Ch Cc: Naveen Krishna Chatradhi , linux-i2c@vger.kernel.org, linux-arm-kernel@lists.infradead.org, "linux-samsung-soc@vger.kernel.org" , sjg@chromium.org, grundler@chromium.org, linux-kernel@vger.kernel.org, wsa@the-dreams.de, cpgs@samsung.com Message-ID: <20140509145425.GP12304@sirena.org.uk> References: <1398350916-885-1-git-send-email-ch.naveen@samsung.com> <20140424162558.GB12304@sirena.org.uk> <20140509135153.GM12304@sirena.org.uk> MIME-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha1; protocol="application/pgp-signature"; boundary="G/DxHU2WzS4MrbHf" Content-Disposition: inline In-Reply-To: X-Cookie: You will be successful in your work. User-Agent: Mutt/1.5.23 (2014-03-12) X-SA-Exim-Connect-IP: 94.175.94.161 X-SA-Exim-Mail-From: broonie@sirena.org.uk Subject: Re: [PATCH] i2c: exynos5: Initialise Samsung High Speed I2C controller early X-SA-Exim-Version: 4.2.1 (built Mon, 26 Dec 2011 16:24:06 +0000) X-SA-Exim-Scanned: Yes (on mezzanine.sirena.org.uk) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org --G/DxHU2WzS4MrbHf Content-Type: text/plain; charset=us-ascii Content-Disposition: inline On Fri, May 09, 2014 at 08:12:47PM +0530, Naveen Krishna Ch wrote: > On 9 May 2014 19:21, Mark Brown wrote: > > On Fri, May 09, 2014 at 05:50:00PM +0530, Naveen Krishna Ch wrote: > >> DRM related drivers like DP, FIMD, HDMI, Mixer wants to be probed ASAP > >> during the boot. > >> The real problem comes when, one of these drivers do a regulator_get(). > >> If the physical supply is not enabled/hookedup the regulator_get() call > >> assumes that physical supply is present and returns a > >> "dummy_regulator" (But, not an error). > >> Because of which, Display and several other devices fails to work. > > These drivers are buggy, if they geniunely expect and handle a missing > > supply then they should be using regulator_get_optional() to request the > > regulator and even if they don't the use of subsys_initcall() is not > > going to fix anything here - if a dummy regulator is going to be > > returned the time things are probed won't make a difference. ... > If all the I2C, SPI, DMA, I2C_TUNNEL, DRM based LCD are all mod_probes() > DRM drivers are probing a head of the PMIC probe. Which is causing the > display drivers to get "dummy_regulators" instead of the real supplies. No, it really won't - I have no idea what you are doing but it's not mainline. If you are getting dummy regulators then you don't have a supply present at all and probe ordering isn't going to make a blind bit of difference. Please provide a specific technical description of the problem you are seeing in mainline. --G/DxHU2WzS4MrbHf Content-Type: application/pgp-signature; name="signature.asc" Content-Description: Digital signature -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.22 (GNU/Linux) iQIcBAEBAgAGBQJTbOweAAoJELSic+t+oim9qmEQAIBgTYCj60m9MycyLdqiu1x+ jZERq9chAR4ARa1ga781Hz2p9J+vbRFw7wJQkpn38DjMY3s3dK5T6BQ8g3zEydn6 C21FAOQFiomQJqs2wPQgUxoYFQQuwbhLci80GIsCkbU4gFRGHpKraEyXqPtq45cf V4Mb8FWkAQZ7xF5LsdtqWDhzdiHon1XKc5CT3WIt+Vnny21O6OQDc0i6FDpC6M6K 4fKLDJ3ZPiDATR6IBjtns/erw2FrWvivNTyzwCKMPGnu5UGZ+2jNngcOZJybtDhJ zr5phiJfeFC01jMUo7SWs44YB55bx3SF8r81agvq6gagDPifL6jKoconxLJRLhLq IUuOv43fqfWhjLRQBmpERdO/YDXYY0wTdhRbpwY32qxSX+UWRxJPGJFEhqLfEkp0 v1j5xvyQmZHQ0076ppVtFI/8JBZjM58xah41gWKnDXlUWgE/Vvl6KaU2yh4x8h1T jqNYuEgERl3mH5vCPa+SAMyLOS4GzYeRTX2KsJWMhi+rhopkvLN5JrakybgZD38C iHolRU5hpn3MGBVYPeAWwTJvrwznEHfw4XUIvLTbB3h8XR95Vw8PIgxp4nVULXg3 OtTf5/IDeCuThuAygDxeR+RMMnRz5RMcxnc3DE+uFPdEE6UkJRhc+jH0wtCPXN9C CHVao7NHXm9e9bCK++MA =2eJK -----END PGP SIGNATURE----- --G/DxHU2WzS4MrbHf--