linux/drivers/gpu/drm
Sonika Jindal 0b5e88dc25 drm/i915: Add hot_plug hook for hdmi encoder
This patch adds a separate probe function for HDMI
EDID read over DDC channel. This function has been
registered as a .hot_plug handler for HDMI encoder.

The current implementation of hdmi_detect()
function re-sets the cached HDMI edid (in connector->detect_edid) in
every detect call.This function gets called many times, sometimes
directly from userspace probes, forcing drivers to read EDID every
detect function call.This causes several problems like:

1. Race conditions in multiple hot_plug / unplug cases, between
   interrupts bottom halves and userspace detections.
2. Many Un-necessary EDID reads for single hotplug/unplug
3. HDMI complaince failures which expects only one EDID read per hotplug

This function will be serving the purpose of really reading the EDID
by really probing the DDC channel, and updating the cached EDID.

The plan is to:
1. i915 IRQ handler bottom half function already calls
   intel_encoder->hotplug() function. Adding This probe function which
   will read the EDID only in case of a hotplug / unplug.
2. During init_connector this probe will be called to read the edid
3. Reuse the cached EDID in hdmi_detect() function.

The "< gen7" check is there because this was tested only for >=gen7
platforms. For older platforms the hotplug/reading edid path remains same.

v2: Calling set_edid instead of hdmi_probe during init.
Also, for platforms having DDI, intel_encoder for DP and HDMI is same
(taken from intel_dig_port), so for DP also, hot_plug function gets called
which is not intended here. So, check for HDMI in intel_hdmi_probe
Rely on HPD for updating edid only for platforms gen > 8 and also for VLV.

v3: Dropping the gen < 8 || !VLV  check. Now all platforms should rely on
hotplug or init for updating the edid.(Daniel)
Also, calling hdmi_probe in init instead of set_edid

v4: Renaming intel_hdmi_probe to intel_hdmi_hot_plug.
Also calling this hotplug handler from intel_hpd_init to take care of init
resume scenarios.

v5: Moved the call to encoder hotplug during init to separate patch(Daniel)

Signed-off-by: Shashank Sharma <shashank.sharma@intel.com>
Signed-off-by: Sonika Jindal <sonika.jindal@intel.com>
[danvet: Mark intel_hdmi_hot_plug as static.]
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
2015-10-06 10:52:22 +02:00
..
amd Merge tag 'topic/drm-misc-2015-09-25' of git://anongit.freedesktop.org/drm-intel into drm-next 2015-09-30 08:35:45 +10:00
armada drm/armada: Use new drm_fb_helper functions 2015-08-06 14:12:56 +02:00
ast drm/ast: Don't grab dev->struct_mutex for in mmap offset ioctl 2015-08-10 13:36:55 +02:00
atmel-hlcdc drm/atomic: Make prepare_fb/cleanup_fb only take state, v3. 2015-09-08 13:45:54 +02:00
bochs drm/bochs: Don't grab dev->struct_mutex for in mmap offset ioctl 2015-08-10 13:37:04 +02:00
bridge Merge branch 'drm-dwhdmi-devel' of git://ftp.arm.linux.org.uk/~rmk/linux-arm into drm-next 2015-08-27 13:01:57 +10:00
cirrus drm/cirrus: Don't grab dev->struct_mutex for in mmap offset ioctl 2015-08-10 13:37:27 +02:00
exynos Linux 4.3-rc2 2015-09-24 17:18:41 +02:00
fsl-dcu Merge tag 'topic/drm-misc-2015-09-25' of git://anongit.freedesktop.org/drm-intel into drm-next 2015-09-30 08:35:45 +10:00
gma500 drm/gma500: Remove DP_LINK_STATUS_SIZE redefinition 2015-09-24 20:14:25 +02:00
i2c Linux 4.3-rc2 2015-09-24 17:18:41 +02:00
i810
i915 drm/i915: Add hot_plug hook for hdmi encoder 2015-10-06 10:52:22 +02:00
imx Merge branch 'drm-dwhdmi-devel' of git://ftp.arm.linux.org.uk/~rmk/linux-arm into drm-next 2015-08-27 13:01:57 +10:00
mga
mgag200 drm/mgag200: Fix driver_load error handling 2015-09-24 08:10:44 +10:00
msm Linux 4.3-rc2 2015-09-24 17:18:41 +02:00
nouveau drm: Stop using linedur_ns and pixeldur_ns for vblank timestamps 2015-09-24 20:14:21 +02:00
omapdrm drm: Spell vga_switcheroo consistently 2015-09-24 20:14:19 +02:00
panel drm/panel: Add support for LG LG4573 480x800 4.3" panel 2015-08-14 21:35:35 +02:00
qxl drm/qxl: only report first monitor as connected if we have no state 2015-09-24 08:08:17 +10:00
r128
radeon Merge tag 'topic/drm-misc-2015-09-25' of git://anongit.freedesktop.org/drm-intel into drm-next 2015-09-30 08:35:45 +10:00
rcar-du drm/atomic-helper: Add option to update planes only on active crtc 2015-09-08 13:49:08 +02:00
rockchip drm/rockchip: vop: support plane scale 2015-08-26 14:16:26 +08:00
savage
shmobile
sis
sti drm/atomic-helper: Add option to update planes only on active crtc 2015-09-08 13:49:08 +02:00
tdfx
tegra drm/tegra: Handle I2C_WRITE_STATUS_UPDATE for address only writes 2015-09-08 20:15:42 +02:00
tilcdc
ttm drm/ttm: Fix memory space allocation v2 2015-09-15 00:57:01 -07:00
udl drm/udl: Use new drm_fb_helper functions 2015-08-06 14:13:00 +02:00
vgem mm: mark most vm_operations_struct const 2015-09-10 13:29:01 -07:00
via treewide: fix typos in comment blocks 2015-08-07 14:46:24 +02:00
virtio drm/virtio: Use new drm_fb_helper functions 2015-08-06 14:13:07 +02:00
vmwgfx Merge tag 'vmwgfx-fixes-4.3-150924' of git://people.freedesktop.org/~thomash/linux into drm-fixes 2015-09-24 18:36:04 +10:00
ati_pcigart.c
drm_agpsupport.c
drm_atomic_helper.c Linux 4.3-rc2 2015-09-24 17:18:41 +02:00
drm_atomic.c drm: drm_atomic_crtc_get_property should be static 2015-09-24 20:14:26 +02:00
drm_auth.c
drm_bridge.c
drm_bufs.c
drm_cache.c
drm_context.c
drm_crtc_helper.c
drm_crtc_internal.h
drm_crtc.c drm/core: Preserve the fb id on close. 2015-09-24 20:14:24 +02:00
drm_debugfs.c
drm_dma.c
drm_dp_helper.c Linux 4.3-rc2 2015-09-24 17:18:41 +02:00
drm_dp_mst_topology.c Linux 4.2-rc8 2015-08-24 16:36:42 +10:00
drm_drv.c drm: move drm_class into drm_sysfs.c 2015-09-09 15:05:17 +02:00
drm_edid_load.c drm: Constify generic_edid_names[] 2015-09-08 13:45:52 +02:00
drm_edid.c drm: Make drm_av_sync_delay() 'mode' argument const 2015-09-09 14:53:54 +02:00
drm_encoder_slave.c
drm_fb_cma_helper.c drm/fb_cma_helper: Use new drm_fb_helper functions 2015-08-06 14:13:00 +02:00
drm_fb_helper.c drm/fbdev: Update legacy plane->fb refcounting for atomic restore 2015-09-24 20:14:20 +02:00
drm_flip_work.c
drm_fops.c
drm_gem_cma_helper.c drm/cma-helper: Don't grab dev->struct_mutex for in mmap offset ioctl 2015-08-10 13:37:36 +02:00
drm_gem.c drm/gem: Be more friendly with locking checks 2015-08-10 13:35:49 +02:00
drm_global.c
drm_hashtab.c
drm_info.c
drm_internal.h drm: move drm_class into drm_sysfs.c 2015-09-09 15:05:17 +02:00
drm_ioc32.c
drm_ioctl.c drm: Allow also control clients to check the drm version 2015-09-24 00:24:24 -07:00
drm_irq.c drm/irq: Add drm_crtc_vblank_count_and_time() 2015-09-24 20:27:17 +02:00
drm_legacy.h
drm_lock.c
drm_memory.c
drm_mipi_dsi.c
drm_mm.c drm/mm: Do DRM_MM_CREATE_TOP adj_start calculation after color_adjust 2015-09-08 13:45:47 +02:00
drm_modes.c
drm_modeset_lock.c drm/atomic: Make sure lock is held in trylock contexts. 2015-09-08 13:45:53 +02:00
drm_of.c
drm_panel.c
drm_pci.c
drm_plane_helper.c drm/atomic: Make prepare_fb/cleanup_fb only take state, v3. 2015-09-08 13:45:54 +02:00
drm_platform.c
drm_prime.c
drm_probe_helper.c
drm_rect.c
drm_scatter.c
drm_sysfs.c drm: move drm_class into drm_sysfs.c 2015-09-09 15:05:17 +02:00
drm_trace_points.c
drm_trace.h
drm_vm.c
drm_vma_manager.c
Kconfig Merge branch 'drm-next-fsl-dcu' of https://github.com/Jianwei-Wang/linux-drm-fsl-dcu into drm-next 2015-08-20 14:11:17 +10:00
Makefile drm/layerscape: Add Freescale DCU DRM driver 2015-08-19 22:23:04 -04:00