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android_kernel_motorola_sm6375/drivers
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Filename Latest commit message Latest commit date
Jani Nikula c6cd2ee2d5 drm/i915/dp: workaround BIOS eDP bpp clamping issue 
This isn't a real fix to the problem, but rather a stopgap measure while
trying to find a proper solution.

There are several laptops out there that fail to light up the eDP panel
in UEFI boot mode. They seem to be mostly IVB machines, including but
apparently not limited to Dell XPS 13, Asus TX300, Asus UX31A, Asus
UX32VD, Acer Aspire S7. They seem to work in CSM or legacy boot.

The difference between UEFI and CSM is that the BIOS provides a
different VBT to the kernel. The UEFI VBT typically specifies 18 bpp and
1.62 GHz link for eDP, while CSM VBT has 24 bpp and 2.7 GHz link. We end
up clamping to 18 bpp in UEFI mode, which we can fit in the 1.62 Ghz
link, and for reasons yet unknown fail to light up the panel.

Dithering from 24 to 18 bpp itself seems to work; if we use 18 bpp with
2.7 GHz link, the eDP panel lights up. So essentially this is a link
speed issue, and *not* a bpp clamping issue.

The bug raised its head since
commit 657445fe86
Author: Daniel Vetter <daniel.vetter@ffwll.ch>
Date:   Sat May 4 10:09:18 2013 +0200

    Revert "drm/i915: revert eDP bpp clamping code changes"

which started clamping bpp *before* computing the link requirements, and
thus affecting the required bandwidth. Clamping after the computations
kept the link at 2.7 GHz.

Even though the BIOS tells us to use 18 bpp through the VBT, it happily
boots up at 24 bpp and 2.7 GHz itself! Use this information to
selectively ignore the VBT provided value.

We can't ignore the VBT eDP bpp altogether, as there are other laptops
that do require the clamping to be used due to EDID reporting higher bpp
than the panel can support.

Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=59841
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=67950
Tested-by: Ulf Winkelvos <ulf@winkelvos.de>
Tested-by: jkp <jkp@iki.fi>
CC: stable@vger.kernel.org
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
2013-10-28 17:48:30 +01:00
..
accessibility
acpi ACPI / PM: Drop two functions that are not used any more 2013-10-17 15:44:48 +02:00
amba
ata Merge branch 'for-3.12-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/libata 2013-10-22 08:21:34 +01:00
atm atm: nicstar: fix regression made by previous patch 2013-09-15 22:18:55 -04:00
auxdisplay
base driver core: Release device_hotplug_lock when store_mem_state returns EINVAL 2013-10-16 18:42:41 -07:00
bcma bcma: make bcma_core_pci_{up,down}() callable from atomic context 2013-09-26 14:02:33 -04:00
block cciss: fix info leak in cciss_ioctl32_passthru() 2013-09-24 17:00:26 -07:00
bluetooth Bluetooth: btusb: Add support for Belkin F8065bf 2013-09-23 17:44:25 -03:00
bus bus: mvebu-mbus: Fix optional pcie-mem/io-aperture properties 2013-10-01 17:04:17 +00:00
cdrom
char A small fix for Xen on x86_32 and a build fix for xen-tpmfront on arm64. 2013-10-15 16:22:11 -07:00
clk The common clk framework changes for 3.12 are dominated by clock driver 2013-09-09 15:49:04 -07:00
clocksource clocksource: em_sti: Set cpu_possible_mask to fix SMP broadcast 2013-09-26 02:31:04 +02:00
connector connector: use 'size' everywhere in cn_netlink_send() 2013-10-02 16:03:50 -04:00
cpufreq acpi-cpufreq: Fail initialization if driver cannot be registered 2013-10-25 16:22:47 +02:00
cpuidle ACPI and power management fixes for 3.12-rc1 2013-09-12 11:22:45 -07:00
crypto Merge git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux 2013-09-07 12:53:35 +10:00
dca
devfreq
dio
dma dmaengine: edma: fix another memory leak 2013-10-24 22:17:50 +05:30
edac Merge git://git.kernel.org/pub/scm/linux/kernel/git/cmetcalf/linux-tile 2013-09-06 11:14:33 -07:00
eisa
extcon Driver core patches for 3.12-rc1 2013-09-03 11:37:15 -07:00
firewire
firmware firmware/dmi_scan: drop OOM messages 2013-09-11 15:58:51 -07:00
fmc
gpio gpiolib: let gpiod_request() return -EPROBE_DEFER 2013-10-11 16:31:54 +02:00
gpu drm/i915/dp: workaround BIOS eDP bpp clamping issue 2013-10-28 17:48:30 +01:00
hid HID: wiimote: add LEGO-wiimote VID 2013-10-21 13:39:37 +02:00
hsi
hv Revert "Drivers: hv: vmbus: Fix a bug in channel rescind code" 2013-10-17 09:30:10 -07:00
hwmon hwmon: (applesmc) Always read until end of data 2013-10-09 09:48:55 -07:00
hwspinlock
i2c i2c: i2c-mux-pinctrl: use deferred probe when adapter not found 2013-10-10 10:22:35 +02:00
ide ide: sgiioc4: Staticize ioc4_ide_attach_one() 2013-09-05 15:21:30 -04:00
idle
iio iio:buffer: Free active scan mask in iio_disable_all_buffers() 2013-10-15 19:26:43 +01:00
infiniband Merge git://git.kernel.org/pub/scm/linux/kernel/git/nab/target-pending 2013-10-27 10:16:33 -07:00
input Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input 2013-09-15 07:13:39 -04:00
iommu x86, build, pci: Fix PCI_MSI build on !SMP 2013-10-04 10:43:34 -07:00
ipack
irqchip ARM: SoC late changes for v3.12 2013-09-09 16:35:29 -07:00
isdn isdn: hfcpci_softirq: get func return to suppress compiler warning 2013-09-15 22:27:04 -04:00
leds Merge branch 'for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/cooloney/linux-leds 2013-09-12 11:35:33 -07:00
lguest lguest: fix guest kernel stack overflow when TF bit set. 2013-09-06 08:09:27 +09:30
macintosh
mailbox mailbox: remove unnecessary platform_set_drvdata() 2013-09-18 12:02:00 -07:00
md raid5: avoid finding "discard" stripe 2013-10-24 13:00:24 +11:00
media [media] saa7134: Fix crash when device is closed before streamoff 2013-10-14 06:37:00 -03:00
memory ARM: SoC platform changes for 3.12 2013-09-06 13:30:06 -07:00
memstick memstick: add support for legacy memorysticks 2013-09-11 15:59:35 -07:00
message
mfd Remove GENERIC_HARDIRQ config option 2013-09-13 15:09:52 +02:00
misc mei: cancel stall timers in mei_reset 2013-09-26 13:56:53 -07:00
mmc ARM: shmobile: update SDHI DT compatibility string to the <unit>-<soc> format 2013-09-21 09:55:32 -07:00
mtd mtd: gpmi: fix ECC regression 2013-10-25 10:09:43 -07:00
net Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2013-10-23 07:47:42 +01:00
nfc
ntb ntb: clean up unnecessary MSI/MSI-X capability find 2013-09-05 11:08:01 -07:00
nubus
of Revert "drivers: of: add initialization code for dma reserved memory" 2013-10-15 09:26:07 +01:00
oprofile oprofile: get rid of pointless forward declarations of struct super_block 2013-09-03 22:52:48 -04:00
parisc PCI changes for the v3.12 merge window: 2013-09-03 16:24:35 -07:00
parport
pci ACPI / hotplug / PCI: Drop WARN_ON() from acpiphp_enumerate_slots() 2013-10-12 01:49:48 +02:00
pcmcia
pinctrl pinctrl: palmas: do not abort pin configuration for BIAS_DEFAULT 2013-09-27 16:22:43 +02:00
platform platform/x86: fix asus-wmi build error 2013-10-23 07:57:57 +01:00
pnp pnp: change pnp bus pm_ops to invoke pnp driver dev_pm_ops if specified 2013-09-11 15:58:15 -07:00
power Remove GENERIC_HARDIRQ config option 2013-09-13 15:09:52 +02:00
pps Remove GENERIC_HARDIRQ config option 2013-09-13 15:09:52 +02:00
ps3
ptp
pwm ARM: SoC cleanups for 3.12 2013-09-06 13:21:16 -07:00
rapidio
regulator Merge remote-tracking branch 'regulator/fix/wm8350' into regulator-linus 2013-09-30 12:04:33 +01:00
remoteproc
reset
rpmsg
rtc rtc: simplify devm_request_mem_region/devm_ioremap 2013-09-11 15:58:59 -07:00
s390 s390/time: correct use of store clock fast 2013-10-22 09:16:40 +02:00
sbus
scsi [SCSI] sd: call blk_pm_runtime_init before add_disk 2013-10-23 14:09:18 +01:00
sfi
sh
sn
spi Merge remote-tracking branch 'spi/fix/s3c64xx' into spi-linus 2013-10-07 14:51:59 +01:00
ssb
staging Merge branch 'v4l_for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mchehab/linux-media 2013-10-23 07:52:36 +01:00
target target/pscsi: fix return value check 2013-10-25 10:42:09 -07:00
tc
thermal Merge branch 'x86_pkg_temp' of .git into for-rc 2013-10-21 11:26:45 +08:00
tty serial: vt8500: add missing braces 2013-10-16 13:22:16 -07:00
uio Driver core patches for 3.12-rc1 2013-09-03 11:37:15 -07:00
usb usb: misc: usb3503: Fix compile error due to incorrect regmap depedency 2013-10-16 13:52:16 -07:00
uwb
vfio VFIO: vfio_iommu_type1: fix bug caused by break in nested loop 2013-10-11 10:40:46 -06:00
vhost vhost/scsi: Fix incorrect usage of get_user_pages_fast write parameter 2013-10-25 11:03:34 -07:00
video video: mxsfb: Add missing break 2013-09-26 15:33:23 +03:00
virt
virtio virtio_pci: pm: Use CONFIG_PM_SLEEP instead of CONFIG_PM 2013-09-09 10:02:53 +09:30
vlynq
vme
w1 w1 - call request_module with w1 master mutex unlocked 2013-10-07 00:12:14 -07:00
watchdog watchdog: sunxi: Fix section mismatch 2013-10-13 20:02:03 +02:00
xen Bug-fixes: 2013-09-25 15:50:53 -07:00
zorro
Kconfig
Makefile