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[79.139.233.208]) by smtp.googlemail.com with ESMTPSA id t67sm467079lje.19.2019.07.10.06.11.17 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Wed, 10 Jul 2019 06:11:18 -0700 (PDT) Subject: Re: [PATCH v1] drm/modes: Skip invalid cmdline mode To: Maxime Ripard Cc: Thierry Reding , Jonathan Hunter , Maarten Lankhorst , Sean Paul , Daniel Vetter , David Airlie , dri-devel@lists.freedesktop.org, linux-tegra@vger.kernel.org, linux-kernel@vger.kernel.org References: <20190709145151.23086-1-digetx@gmail.com> <20190710101229.54ufuhmh22dfxclr@flea> <4ad69d15-07f8-9753-72d6-a51402c94c20@gmail.com> <20190710125552.qvmnh6qs63ikiu2k@flea> <20190710130615.gvi2jwgr2cds66xr@flea> From: Dmitry Osipenko Message-ID: <75719cad-c65c-7ebc-3ea8-98134f86ddc3@gmail.com> Date: Wed, 10 Jul 2019 16:11:17 +0300 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.7.2 MIME-Version: 1.0 In-Reply-To: <20190710130615.gvi2jwgr2cds66xr@flea> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 10.07.2019 16:06, Maxime Ripard пишет: > On Wed, Jul 10, 2019 at 03:59:55PM +0300, Dmitry Osipenko wrote: >> 10.07.2019 15:55, Maxime Ripard пишет: >>> On Wed, Jul 10, 2019 at 03:42:28PM +0300, Dmitry Osipenko wrote: >>>> 10.07.2019 13:12, Maxime Ripard пишет: >>>>> On Tue, Jul 09, 2019 at 05:51:51PM +0300, Dmitry Osipenko wrote: >>>>>> The named mode could be invalid and then cmdline parser misses to validate >>>>>> mode's dimensions, happily adding 0x0 mode as a valid mode. One case where >>>>>> this happens is NVIDIA Tegra devices that are using downstream bootloader >>>>>> which adds "video=tegrafb" to the kernel's cmdline and thus upstream Tegra >>>>>> DRM driver fails to probe because of the invalid mode. >>>>>> >>>>>> Fixes: 3aeeb13d8996 ("drm/modes: Support modes names on the command line") >>>>>> Signed-off-by: Dmitry Osipenko >>>>> >>>>> Applied to drm-misc-next-fixes >>>>> >>>>> Thanks for figuring this out! >>>> >>>> Thank you very much! So the driver now doesn't fail to probe because >>>> of the cmdline, but what else I noticed is that the framebuffer >>>> console is now rotated by 90° on a 800x1280 panel, while display in >>>> Xorg is vertical as it was before. Seems something else is still >>>> missing, reverting "drm/modes: Rewrite the command line parser" >>>> returns the framebuffer's console orientation into the original >>>> state. >>> >>> What is the whole command line passed by the bootloader ? >> >> tegraid=30.1.3.0.0 mem=1022M@2048M android.commchip=0 vmalloc=512M androidboot.serialno=015d3f18c9081210 video=tegrafb no_console_suspend=1 console=none >> debug_uartport=hsport usbcore.old_scheme_first=1 lp0_vec=8192@0xbddf9000 tegra_fbmem=8195200@0xabe01000 core_edp_mv=0 audio_codec=rt5640 board_info=f41:a00:1:44:2 >> root=/dev/sda1 rw rootwait tegraboot=sdmmc gpt gpt_sector=61079551 androidboot.bootloader=4.23 androidboot.baseband=1231_0.18.0_0409 > > Thanks. > > It still doesn't really make sense to me why that video=tegrafb should > be considered valid. > > However, I don't see anything rotation related in the commit you > list. Are you sure it's really the offending one and not another one? Yes. > Also, do you have the option to recompile a kernel so that we can add > some debug? Recompiling kernel is not a problem at all. Before "drm/modes: Rewrite the command line parser": [ 1.256454] [drm] parse error at position 6 in video mode 'tegrafb' [ 1.256654] [drm] Supports vblank timestamp caching Rev 2 (21.10.2013). [ 1.256664] [drm] No driver support for vblank timestamp query. [ 1.256703] [drm:drm_client_modeset_probe] [ 1.256719] [drm:drm_helper_probe_single_connector_modes] [CONNECTOR:95:LVDS-1] [ 1.256731] [drm:drm_helper_probe_single_connector_modes] [CONNECTOR:95:LVDS-1] status updated from unknown to connected [ 1.256828] [drm:drm_helper_probe_single_connector_modes] [CONNECTOR:95:LVDS-1] probed modes : [ 1.256842] [drm:drm_mode_debug_printmodeline] Modeline "800x1280": 60 66770 800 849 882 899 1280 1281 1288 1303 0x48 0xa [ 1.256849] [drm:drm_client_modeset_probe] connector 95 enabled? yes [ 1.256859] [drm:drm_client_modeset_probe] Not using firmware configuration [ 1.256867] [drm:drm_client_modeset_probe] looking for cmdline mode on connector 95 [ 1.256874] [drm:drm_client_modeset_probe] looking for preferred mode on connector 95 0 [ 1.256880] [drm:drm_client_modeset_probe] found mode 800x1280 [ 1.256886] [drm:drm_client_modeset_probe] picking CRTCs for 4096x4096 config [ 1.256896] [drm:drm_client_modeset_probe] desired mode 800x1280 set on crtc 94 (0,0) [ 1.279069] [drm:tegra_crtc_atomic_enable] rate: 408000000, div: 10 [ 1.279077] [drm:tegra_crtc_atomic_enable] pclk: 0 [ 1.296744] [drm:drm_fb_helper_hotplug_event.part.0] [ 1.296760] [drm:drm_client_modeset_probe] [ 1.296792] [drm:drm_helper_probe_single_connector_modes] [CONNECTOR:95:LVDS-1] [ 1.296987] [drm:drm_helper_probe_single_connector_modes] [CONNECTOR:95:LVDS-1] probed modes : [ 1.297010] [drm:drm_mode_debug_printmodeline] Modeline "800x1280": 60 66770 800 849 882 899 1280 1281 1288 1303 0x48 0xa [ 1.297022] [drm:drm_client_modeset_probe] connector 95 enabled? yes [ 1.297040] [drm:drm_client_modeset_probe] Not using firmware configuration [ 1.297054] [drm:drm_client_modeset_probe] looking for cmdline mode on connector 95 [ 1.297065] [drm:drm_client_modeset_probe] looking for preferred mode on connector 95 0 [ 1.297073] [drm:drm_client_modeset_probe] found mode 800x1280 [ 1.297083] [drm:drm_client_modeset_probe] picking CRTCs for 800x1280 config [ 1.297102] [drm:drm_client_modeset_probe] desired mode 800x1280 set on crtc 94 (0,0) After: [ 1.225000] [drm:drm_connector_init] cmdline mode for connector LVDS-1 tegrafb 0x0@60Hz [ 1.225143] [drm] Supports vblank timestamp caching Rev 2 (21.10.2013). [ 1.225154] [drm] No driver support for vblank timestamp query. [ 1.225182] [drm:drm_client_modeset_probe] [ 1.225195] [drm:drm_helper_probe_single_connector_modes] [CONNECTOR:95:LVDS-1] [ 1.225203] [drm:drm_helper_probe_single_connector_modes] [CONNECTOR:95:LVDS-1] status updated from unknown to connected [ 1.225283] [drm:drm_helper_probe_single_connector_modes] [CONNECTOR:95:LVDS-1] probed modes : [ 1.225294] [drm:drm_mode_debug_printmodeline] Modeline "800x1280": 60 66770 800 849 882 899 1280 1281 1288 1303 0x48 0xa [ 1.225299] [drm:drm_client_modeset_probe] connector 95 enabled? yes [ 1.225307] [drm:drm_client_modeset_probe] Not using firmware configuration [ 1.225314] [drm:drm_client_modeset_probe] looking for cmdline mode on connector 95 [ 1.225319] [drm:drm_client_modeset_probe] looking for preferred mode on connector 95 0 [ 1.225323] [drm:drm_client_modeset_probe] found mode 800x1280 [ 1.225328] [drm:drm_client_modeset_probe] picking CRTCs for 4096x4096 config [ 1.225336] [drm:drm_client_modeset_probe] desired mode 800x1280 set on crtc 94 (0,0) [ 1.249051] [drm:tegra_crtc_atomic_enable] rate: 408000000, div: 10 [ 1.249058] [drm:tegra_crtc_atomic_enable] pclk: 0 [ 1.266748] [drm:drm_fb_helper_hotplug_event.part.0] [ 1.266768] [drm:drm_client_modeset_probe] [ 1.266805] [drm:drm_helper_probe_single_connector_modes] [CONNECTOR:95:LVDS-1] [ 1.267045] [drm:drm_helper_probe_single_connector_modes] [CONNECTOR:95:LVDS-1] probed modes : [ 1.267074] [drm:drm_mode_debug_printmodeline] Modeline "800x1280": 60 66770 800 849 882 899 1280 1281 1288 1303 0x48 0xa [ 1.267091] [drm:drm_client_modeset_probe] connector 95 enabled? yes [ 1.267113] [drm:drm_client_modeset_probe] Not using firmware configuration [ 1.267129] [drm:drm_client_modeset_probe] looking for cmdline mode on connector 95 [ 1.267143] [drm:drm_client_modeset_probe] looking for preferred mode on connector 95 0 [ 1.267155] [drm:drm_client_modeset_probe] found mode 800x1280 [ 1.267168] [drm:drm_client_modeset_probe] picking CRTCs for 800x1280 config [ 1.267191] [drm:drm_client_modeset_probe] desired mode 800x1280 set on crtc 94 (0,0)