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During intel_atomic_check(), we do not take the intel_runtime_pm_get() wakeref and so should do the atomic modeset precalculations without referring to the HW. However, on Ironlake we see <7>[ 23.487557] [drm:intel_atomic_check [i915]] [CONNECTOR:47:VGA-1] checking for sink bpp constrains <7>[ 23.487615] [drm:intel_atomic_check [i915]] clamping display bpp (was 36) to default limit of 24 <4>[ 23.487621] RPM wakelock ref not held during HW access <4>[ 23.487652] ------------[ cut here ]------------ <4>[ 23.487697] WARNING: CPU: 0 PID: 1343 at drivers/gpu/drm/i915/intel_drv.h:1813 gen5_read32+0x183/0x200 [i915] <4>[ 23.487701] Modules linked in: snd_hda_codec_hdmi snd_hda_codec_realtek snd_hda_codec_generic i915 intel_powerclamp coretemp crct10dif_pclmul crc32_pclmul snd_hda_intel ghash_clmulni_intel snd_hda_codec snd_hwdep snd_hda_core snd_pcm lpc_ich e1000e mei_me ptp mei pps_core prime_numbers <4>[ 23.487784] CPU: 0 PID: 1343 Comm: debugfs_test Tainted: G W 4.14.0-rc7-CI-Trybot_1378+ #1 <4>[ 23.487788] Hardware name: Hewlett-Packard HP Compaq 8100 Elite SFF PC/304Ah, BIOS 786H1 v01.13 07/14/2011 <4>[ 23.487793] task: ffff8801f90aa6c0 task.stack: ffffc900013ec000 <4>[ 23.487838] RIP: 0010:gen5_read32+0x183/0x200 [i915] <4>[ 23.487842] RSP: 0018:ffffc900013efb58 EFLAGS: 00010292 <4>[ 23.487849] RAX: 000000000000002a RBX: ffff880205c00000 RCX: 0000000000000006 <4>[ 23.487854] RDX: 000000000000140a RSI: ffffffff81d0eb14 RDI: ffffffff81cc26f6 <4>[ 23.487857] RBP: ffffc900013efb80 R08: ffff8801f90aaff8 R09: 0000000000000000 <4>[ 23.487861] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000001 <4>[ 23.487865] R13: 0000000000046000 R14: ffff88020ffaba78 R15: ffff88020b109bf8 <4>[ 23.487870] FS: 00007f53b5e40a40(0000) GS:ffff88021bc00000(0000) knlGS:0000000000000000 <4>[ 23.487874] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 <4>[ 23.487878] CR2: 000055e41900c0e8 CR3: 00000001fa0d6005 CR4: 00000000000206f0 <4>[ 23.487882] Call Trace: <4>[ 23.487931] intel_atomic_check+0x745/0x1290 [i915] <4>[ 23.487948] drm_atomic_check_only+0x459/0x560 <4>[ 23.487956] ? drm_atomic_set_crtc_for_connector+0xc9/0x100 <4>[ 23.488025] drm_atomic_commit+0x18/0x50 <4>[ 23.488035] restore_fbdev_mode_atomic+0x190/0x1f0 <4>[ 23.488059] restore_fbdev_mode+0x32/0x120 <4>[ 23.488072] drm_fb_helper_restore_fbdev_mode_unlocked+0x50/0xa0 <4>[ 23.488139] intel_fbdev_restore_mode+0x34/0x90 [i915] <4>[ 23.488194] i915_driver_lastclose+0xe/0x10 [i915] <4>[ 23.488208] drm_lastclose+0x39/0xf0 <4>[ 23.488219] drm_release+0x30c/0x3c0 <4>[ 23.488236] __fput+0xb9/0x200 <4>[ 23.488252] ____fput+0xe/0x10 <4>[ 23.488264] task_work_run+0x89/0xc0 <4>[ 23.488278] exit_to_usermode_loop+0x83/0x90 <4>[ 23.488290] syscall_return_slowpath+0xd0/0x110 <4>[ 23.488304] entry_SYSCALL_64_fastpath+0xaf/0xb1 <4>[ 23.488312] RIP: 0033:0x7f53b4317560 <4>[ 23.488320] RSP: 002b:00007ffca7e70748 EFLAGS: 00000246 ORIG_RAX: 0000000000000003 <4>[ 23.488333] RAX: 0000000000000000 RBX: 0000000000000001 RCX: 00007f53b4317560 <4>[ 23.488340] RDX: 0000000000000005 RSI: 00007ffca7e70640 RDI: 0000000000000004 <4>[ 23.488347] RBP: 000055e417783900 R08: 000055e418f9e290 R09: 0000000000000000 <4>[ 23.488356] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001 <4>[ 23.488363] R13: 00007f53b4302c40 R14: 0000000000000000 R15: 0000000000000000 <4>[ 23.488384] Code: b5 f2 f2 e0 0f ff e9 c5 fe ff ff 80 3d 0e 4b 10 00 00 0f 85 c6 fe ff ff 48 c7 c7 30 73 29 a0 c6 05 fa 4a 10 00 01 e8 8e f2 f2 e0 <0f> ff e9 ac fe ff ff e8 51 9d f3 e0 85 c0 0f 85 01 ff ff ff 48 <4>[ 23.488780] ---[ end trace 6bc72ce7f1596190 ]--- <7>[ 23.488844] [drm:intel_atomic_check [i915]] checking fdi config on pipe A, lanes 1 <7>[ 23.488911] [drm:intel_atomic_check [i915]] hw max bpp: 36, pipe bpp: 24, dithering: 0 due to intel_fdi_link_freq() poking at FDI_PLL_BIOS_0. Avoid this by recording the fdi pll frequency during device initiailisation. v2: Also extract the static FDI PLL frequencies for Sandybridge and Ivybridge. Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk> Cc: Ville Syrjälä <ville.syrjala@linux.intel.com> Cc: Maarten Lankhorst <maarten.lankhorst@linux.intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20171107214713.18704-1-chris@chris-wilson.co.uk Reviewed-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com> Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Linux kernel ============ This file was moved to Documentation/admin-guide/README.rst Please notice that there are several guides for kernel developers and users. These guides can be rendered in a number of formats, like HTML and PDF. In order to build the documentation, use ``make htmldocs`` or ``make pdfdocs``. There are various text files in the Documentation/ subdirectory, several of them using the Restructured Text markup notation. See Documentation/00-INDEX for a list of what is contained in each file. Please read the Documentation/process/changes.rst file, as it contains the requirements for building and running the kernel, and information about the problems which may result by upgrading your kernel.