Jani Nikula 0501a3b0eb drm/i915/edp: read edp display control registers unconditionally ... Per my reading of the eDP spec, DP_DPCD_DISPLAY_CONTROL_CAPABLE bit in DP_EDP_CONFIGURATION_CAP should be set if the eDP display control registers starting at offset DP_EDP_DPCD_REV are "enabled". Currently we check the bit before reading the registers, and DP_EDP_DPCD_REV is the only way to detect eDP revision. Turns out there are (likely buggy) displays that require eDP 1.4+ features, such as supported link rates and link rate select, but do not have the bit set. Read the display control registers unconditionally. They are supposed to read zero anyway if they are not supported, so there should be no harm in this. This fixes the referenced bug by enabling the eDP version check, and thus reading of the supported link rates. The panel in question has 0 in DP_MAX_LINK_RATE which is only supported in eDP 1.4+. Without the supported link rates method we default to RBR which is insufficient for the panel native mode. As a curiosity, the panel also has a bogus value of 0x12 in DP_EDP_DPCD_REV, but that passes our check for >= DP_EDP_14 (which is 0x03). Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=103400 Reported-and-tested-by: Nicolas P. <issun.artiste@gmail.com> Cc: Ville Syrjälä <ville.syrjala@linux.intel.com> Cc: stable@vger.kernel.org Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com> Reviewed-by: Manasi Navare <manasi.d.navare@intel.com> Signed-off-by: Jani Nikula <jani.nikula@intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20171026142932.17737-1-jani.nikula@intel.com		2017-10-27 12:29:06 +03:00
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amd	drm: Pass struct drm_file * to __drm_mode_object_find [v2]	2017-10-12 10:03:04 +10:00
arc
arm
armada	drm/armada: Remove unused #include <drmP.h>	2017-09-29 09:35:36 +02:00
ast	drm: Pass struct drm_file * to __drm_mode_object_find [v2]	2017-10-12 10:03:04 +10:00
atmel-hlcdc
bochs	drm: Pass struct drm_file * to __drm_mode_object_find [v2]	2017-10-12 10:03:04 +10:00
bridge	drm/bridge/sii8620: add remote control support	2017-10-11 13:14:25 +02:00
cirrus	drm: Pass struct drm_file * to __drm_mode_object_find [v2]	2017-10-12 10:03:04 +10:00
etnaviv	Merge branch 'etnaviv/next' of https://git.pengutronix.de/git/lst/linux into drm-next	2017-10-14 09:39:56 +10:00
exynos	Merge tag 'drm-misc-next-2017-09-20' of git://anongit.freedesktop.org/git/drm-misc into drm-next	2017-09-28 05:46:15 +10:00
fsl-dcu	drm/fsl-dcu: Use drm_gem_fb_create()	2017-10-01 17:00:20 +02:00
gma500	drm/gma500: use ARRAY_SIZE	2017-10-16 11:29:05 +02:00
hisilicon	Merge tag 'drm-misc-next-2017-10-16' of git://anongit.freedesktop.org/drm/drm-misc into drm-next	2017-10-17 10:10:17 +10:00
i2c
i810
i915	drm/i915/edp: read edp display control registers unconditionally	2017-10-27 12:29:06 +03:00
imx	Merge tag 'drm-misc-next-2017-09-20' of git://anongit.freedesktop.org/git/drm-misc into drm-next	2017-09-28 05:46:15 +10:00
lib	mm: treewide: remove GFP_TEMPORARY allocation flag	2017-09-13 18:53:16 -07:00
mediatek
meson	drm/meson: Use drm_gem_fb_create()	2017-10-01 17:01:39 +02:00
mga
mgag200	drm: Pass struct drm_file * to __drm_mode_object_find [v2]	2017-10-12 10:03:04 +10:00
msm	drm/msm/mdp5: remove less than 0 comparison for unsigned value	2017-10-11 13:17:52 +02:00
mxsfb	drm/mxsfb: Use drm_gem_fb_create() and drm_gem_fb_prepare_fb()	2017-10-01 17:02:20 +02:00
nouveau	drm: Pass struct drm_file * to __drm_mode_object_find [v2]	2017-10-12 10:03:04 +10:00
omapdrm	omapdrm: omapdss_hdmi_ops: add lost_hotplug op	2017-10-12 10:49:14 +03:00
panel	drm/panel: Add support for the Raspberry Pi 7" Touchscreen.	2017-10-06 12:10:16 -07:00
pl111	drm/pl111: Add handling of Versatile platforms	2017-09-10 23:58:42 +02:00
qxl	qxl: fix framebuffer unpinning	2017-09-25 08:35:53 +02:00
r128
radeon	drm: Pass struct drm_file * to __drm_mode_object_find [v2]	2017-10-12 10:03:04 +10:00
rcar-du	drm/rcar-du: Use drm_gem_fb_create()	2017-10-01 17:02:53 +02:00
rockchip	drm/rockchip: add PINCTRL dependency for LVDS	2017-10-13 09:43:16 +08:00
savage
selftests	mm: treewide: remove GFP_TEMPORARY allocation flag	2017-09-13 18:53:16 -07:00
shmobile	drm/shmobile: Use drm_gem_fb_create()	2017-10-01 17:03:22 +02:00
sis
sti
stm	drm/stm: ltdc: remove bridge from driver internal structure	2017-10-10 11:32:48 +02:00
sun4i	drm/sun4i: hdmi: Move PAD_CTRL1 setting to mode_set function	2017-10-16 09:54:46 +02:00
tdfx
tegra	drm/tegra: trace: Fix path to include	2017-09-26 11:08:17 +02:00
tilcdc	tilcdc changes for v4.15	2017-10-17 10:13:47 +10:00
tinydrm	drm/tinydrm: Remove explicit .best_encoder assignment	2017-10-13 17:34:51 +02:00
ttm	Merge branch 'drm-next-4.15' of git://people.freedesktop.org/~agd5f/linux into drm-next	2017-10-09 11:00:16 +10:00
tve200	drm/tve200: Use drm_gem_fb_create() and drm_gem_fb_prepare_fb()	2017-10-01 17:04:36 +02:00
udl	drm: Pass struct drm_file * to __drm_mode_object_find [v2]	2017-10-12 10:03:04 +10:00
vc4	drm/vc4: Fix pitch setup for T-format scanout.	2017-10-13 16:40:24 -07:00
vgem
via	drm/via: use ARRAY_SIZE	2017-10-16 11:29:28 +02:00
virtio	Merge airlied/drm-next into drm-misc-next	2017-10-03 11:09:16 +02:00
vmwgfx	drm: Pass struct drm_file * to __drm_mode_object_find [v2]	2017-10-12 10:03:04 +10:00
zte
ati_pcigart.c
drm_agpsupport.c	drm/agpsupport: Remove extra blank line	2017-09-20 09:54:19 -07:00
drm_atomic_helper.c	Merge tag 'drm-misc-next-2017-10-16' of git://anongit.freedesktop.org/drm/drm-misc into drm-next	2017-10-17 10:10:17 +10:00
drm_atomic.c	Merge tag 'drm-misc-next-2017-10-12' of git://anongit.freedesktop.org/drm/drm-misc into drm-next	2017-10-13 16:24:59 +10:00
drm_auth.c
drm_blend.c	mm: treewide: remove GFP_TEMPORARY allocation flag	2017-09-13 18:53:16 -07:00
drm_bridge.c
drm_bufs.c
drm_cache.c
drm_color_mgmt.c	drm: Pass struct drm_file * to __drm_mode_object_find [v2]	2017-10-12 10:03:04 +10:00
drm_connector.c	drm: Pass struct drm_file * to __drm_mode_object_find [v2]	2017-10-12 10:03:04 +10:00
drm_context.c
drm_crtc_helper_internal.h
drm_crtc_helper.c	drm: Replace kzalloc with kcalloc	2017-10-13 15:49:03 -04:00
drm_crtc_internal.h	drm: Pass struct drm_file * to __drm_mode_object_find [v2]	2017-10-12 10:03:04 +10:00
drm_crtc.c	drm: Pass struct drm_file * to __drm_mode_object_find [v2]	2017-10-12 10:03:04 +10:00
drm_debugfs_crc.c	drm/atomic: Prepare drm_modeset_lock infrastructure for interruptible waiting, v2.	2017-09-13 09:50:52 +02:00
drm_debugfs.c
drm_dma.c
drm_dp_aux_dev.c
drm_dp_dual_mode_helper.c	drm: Add retries for lspcon mode detection	2017-10-13 12:13:54 +03:00
drm_dp_helper.c	drm/dp: WARN about invalid/unknown link rates and bw codes	2017-10-11 18:41:44 +03:00
drm_dp_mst_topology.c	drm/dp/mst: Sideband message transaction to power up/down nodes	2017-09-11 16:03:57 +03:00
drm_drv.c	drm: introduce drm_dev_{get/put} functions	2017-09-26 13:12:15 +02:00
drm_dumb_buffers.c
drm_edid_load.c	drm: add backwards compatibility support for drm_kms_helper.edid_firmware	2017-09-19 18:11:45 +03:00
drm_edid.c	drm: handle override and firmware EDID at drm_do_get_edid() level	2017-09-19 17:49:25 +03:00
drm_encoder_slave.c
drm_encoder.c	drm: Pass struct drm_file * to __drm_mode_object_find [v2]	2017-10-12 10:03:04 +10:00
drm_fb_cma_helper.c	drm/fb-cma-helper: Remove unused functions	2017-10-01 17:05:39 +02:00
drm_fb_helper.c	drm: Replace kzalloc with kcalloc	2017-10-13 15:49:03 -04:00
drm_file.c
drm_flip_work.c
drm_fourcc.c
drm_framebuffer.c	drm: Pass struct drm_file * to __drm_mode_object_find [v2]	2017-10-12 10:03:04 +10:00
drm_gem_cma_helper.c
drm_gem_framebuffer_helper.c	drm/gem-fb-helper: Improve documentation	2017-10-08 15:02:51 +02:00
drm_gem.c	drm: fix typo in drm_gem_get_pages() comment	2017-10-04 18:04:28 +02:00
drm_global.c
drm_hashtab.c
drm_info.c
drm_internal.h	drm: vblank: remove drm_timestamp_monotonic parameter	2017-10-13 08:34:50 +10:00
drm_ioc32.c
drm_ioctl.c	drm: vblank: remove drm_timestamp_monotonic parameter	2017-10-13 08:34:50 +10:00
drm_irq.c
drm_kms_helper_common.c	drm: add backwards compatibility support for drm_kms_helper.edid_firmware	2017-09-19 18:11:45 +03:00
drm_legacy.h
drm_lock.c
drm_memory.c
drm_mipi_dsi.c
drm_mm.c	lib/interval_tree: fast overlap detection	2017-09-08 18:26:49 -07:00
drm_mode_config.c	drm/plane: drop num_overlay_planes (v3)	2017-10-17 11:32:29 +10:00
drm_mode_object.c	drm: Pass struct drm_file * to __drm_mode_object_find [v2]	2017-10-12 10:03:04 +10:00
drm_modes.c
drm_modeset_helper.c
drm_modeset_lock.c	drm/atomic: Prepare drm_modeset_lock infrastructure for interruptible waiting, v2.	2017-09-13 09:50:52 +02:00
drm_of.c	drm/drm_of: Move drm_of_panel_bridge_remove_function into header.	2017-10-13 16:59:36 +02:00
drm_panel.c
drm_pci.c	drm/core: clean up references to drm_dev_unref()	2017-09-27 10:53:12 +02:00
drm_plane_helper.c	drm: Replace kzalloc with kcalloc	2017-10-13 15:49:03 -04:00
drm_plane.c	drm/plane: drop num_overlay_planes (v3)	2017-10-17 11:32:29 +10:00
drm_prime.c	drm/core: clean up references to drm_dev_unref()	2017-09-27 10:53:12 +02:00
drm_print.c
drm_probe_helper.c	drm: Pass struct drm_file * to __drm_mode_object_find [v2]	2017-10-12 10:03:04 +10:00
drm_property.c	drm: Pass struct drm_file * to __drm_mode_object_find [v2]	2017-10-12 10:03:04 +10:00
drm_rect.c
drm_scatter.c
drm_scdc_helper.c	Merge tag 'drm-misc-next-2017-09-20' of git://anongit.freedesktop.org/git/drm-misc into drm-next	2017-09-28 05:46:15 +10:00
drm_simple_kms_helper.c
drm_syncobj.c	Merge tag 'drm-misc-next-2017-10-16' of git://anongit.freedesktop.org/drm/drm-misc into drm-next	2017-10-17 10:10:17 +10:00
drm_sysfs.c
drm_trace_points.c
drm_trace.h	drm: Use correct path to trace include	2017-09-05 11:11:18 +02:00
drm_vblank.c	Merge tag 'drm-misc-next-2017-10-16' of git://anongit.freedesktop.org/drm/drm-misc into drm-next	2017-10-17 10:10:17 +10:00
drm_vm.c
drm_vma_manager.c	lib/interval_tree: fast overlap detection	2017-09-08 18:26:49 -07:00
Kconfig	Merge branch 'drm-next-4.15' of git://people.freedesktop.org/~agd5f/linux into drm-next	2017-09-28 08:37:02 +10:00
Makefile	Merge branch 'drm-next-4.15' of git://people.freedesktop.org/~agd5f/linux into drm-next	2017-09-28 08:37:02 +10:00