From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752681AbdJ0M6Y (ORCPT ); Fri, 27 Oct 2017 08:58:24 -0400 Received: from mail-wm0-f47.google.com ([74.125.82.47]:49181 "EHLO mail-wm0-f47.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752348AbdJ0M6W (ORCPT ); Fri, 27 Oct 2017 08:58:22 -0400 X-Google-Smtp-Source: ABhQp+TmCimUfjY3ZZa4cl7ijL3bkgUhALW8NCIkPuBCSSu1xcTsjkVSlwrviP/hPZjBN4xog4+MMw== Subject: Re: 4.13 (and probably all recent) kernels refuse to boot on one Nokia N950, work or another To: Pavel Machek Cc: Sebastian Reichel , Tony Lindgren , pali.rohar@gmail.com, kernel list , linux-arm-kernel , linux-omap@vger.kernel.org, khilman@kernel.org, aaro.koskinen@iki.fi, ivo.g.dimitrov.75@gmail.com, patrikbachan@gmail.com, serge@hallyn.com, abcloriens@gmail.com, clayton@craftyguy.net, martijn@brixit.nl, sakari.ailus@linux.intel.com References: <20171025203459.GA22035@amd> <20171025212806.GA21504@atomide.com> <20171026091325.GA26929@amd> <20171026093115.4bc6ctxjx72ng7ld@earth> <20171026095734.GA10141@amd> <20171026120130.dicanunwcdmjntnb@earth> <20171027101905.GA4287@amd> From: =?UTF-8?Q?Filip_Matijevi=c4=87?= Message-ID: <65ad0b63-cfae-f7ac-f916-32fd0c7c540a@gmail.com> Date: Fri, 27 Oct 2017 14:58:16 +0200 User-Agent: Mozilla/5.0 (X11; Linux i686; rv:52.0) Gecko/20100101 Thunderbird/52.4.0 MIME-Version: 1.0 In-Reply-To: <20171027101905.GA4287@amd> Content-Type: text/plain; charset=windows-1252 Content-Language: en-US Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org > If someone knows how to fix the backlight, it would still be useful. In panel-dsi-cm.c it's set to maximum with dsicm_dcs_write_1(ddata, DCS_BRIGHTNESS, 0xff); Sebastian suggested the same but used 100 instead of 0xff, which might be a bit too low. You can also add msleep(1000) after dsicm_dcs_write_0(ddata, MIPI_DCS_SET_DISPLAY_ON); to see if brightness gets overwritten, the whole display goes into sleep mode, is turned off or similar somewhere down the line. I'm still unable to make N9 panel to cooperate (despite having "the right" clocks and able to send image to panel with MIPI_DCS_WRITE_MEMORY_START/MIPI_DCS_READ_MEMORY_CONTINUE) so I hope you'll have more luck than me! Filip