Simon Rettberg 5954acbacb drm/display: Don't assume dual mode adaptors support i2c sub-addressing ... Current dual mode adaptor ("DP++") detection code assumes that all adaptors support i2c sub-addressing for read operations from the DP-HDMI adaptor ID buffer. It has been observed that multiple adaptors do not in fact support this, and always return data starting at register 0. On affected adaptors, the code fails to read the proper registers that would identify the device as a type 2 adaptor, and handles those as type 1, limiting the TMDS clock to 165MHz, even if the according register would announce a higher TMDS clock. Fix this by always reading the ID buffer starting from offset 0, and discarding any bytes before the actual offset of interest. We tried finding authoritative documentation on whether or not this is allowed behaviour, but since all the official VESA docs are paywalled, the best we could come up with was the spec sheet for Texas Instruments' SNx5DP149 chip family.[1] It explicitly mentions that sub-addressing is supported for register writes, but *not* for reads (See NOTE in section 8.5.3). Unless TI openly decided to violate the VESA spec, one could take that as a hint that sub-addressing is in fact not mandated by VESA. The other two adaptors affected used the PS8409(A) and the LT8611, according to the data returned from their ID buffers. [1] https://www.ti.com/lit/ds/symlink/sn75dp149.pdf Cc: stable@vger.kernel.org Signed-off-by: Simon Rettberg <simon.rettberg@rz.uni-freiburg.de> Reviewed-by: Rafael Gieschke <rafael.gieschke@rz.uni-freiburg.de> Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20221006113314.41101987@computer Acked-by: Jani Nikula <jani.nikula@intel.com>		2022-11-15 23:31:02 +02:00
..
accessibility
acpi	ACPI fixes for 6.1-rc2	2022-10-21 18:08:30 -07:00
amba
android	Scheduler changes for v6.1:	2022-10-10 09:10:28 -07:00
ata	ata: ahci_qoriq: Fix compilation warning	2022-10-18 08:02:14 +09:00
atm
auxdisplay
base	Interrupt subsystem updates:	2022-10-12 10:23:24 -07:00
bcma	Interrupt subsystem updates:	2022-10-12 10:23:24 -07:00
block	block-6.1-2022-10-20	2022-10-21 15:14:14 -07:00
bluetooth
bus	Char/Misc and other driver changes for 6.1-rc1	2022-10-08 08:56:37 -07:00
cdrom
char	This push fixes an issue exposed by the recent change to feed	2022-10-17 10:20:04 -07:00
clk	This is the final part of the clk patches for this merge window.	2022-10-16 11:08:19 -07:00
clocksource	A boring time, timekeeping, timers update:	2022-10-10 10:16:00 -07:00
comedi
connector
counter	gpio updates for v6.1-rc1	2022-10-08 09:46:29 -07:00
cpufreq	cpufreq: sun50i: Switch to use dev_err_probe() helper	2022-10-18 16:22:26 +05:30
cpuidle	RISC-V Patches for the 6.1 Merge Window, Part 1	2022-10-09 13:24:01 -07:00
crypto	This update includes the following changes:	2022-10-10 13:04:25 -07:00
cxl
dax	libnvdimm for 6.1	2022-10-14 18:41:41 -07:00
dca
devfreq
dio
dma	treewide: use get_random_bytes() when possible	2022-10-11 17:42:58 -06:00
dma-buf	whack-a-mole: cropped up open-coded file_inode() uses...	2022-10-06 17:22:11 -07:00
edac	Merge patch series "Use composable cache instead of L2 cache"	2022-10-13 11:07:13 -07:00
eisa
extcon	Char/Misc and other driver changes for 6.1-rc1	2022-10-08 08:56:37 -07:00
firewire
firmware	efi: runtime: Don't assume virtual mappings are missing if VA == PA == 0	2022-10-21 11:09:41 +02:00
fpga	Char/Misc and other driver changes for 6.1-rc1	2022-10-08 08:56:37 -07:00
fsi	fsi: core: Check error number after calling ida_simple_get	2022-09-28 21:10:57 +09:30
gnss
gpio	Interrupt subsystem updates:	2022-10-12 10:23:24 -07:00
gpu	drm/display: Don't assume dual mode adaptors support i2c sub-addressing	2022-11-15 23:31:02 +02:00
greybus
hid	for-linus-2022102101	2022-10-21 17:41:57 -07:00
hsi
hte
hv	hyperv-next for 6.1	2022-10-10 13:59:01 -07:00
hwmon	- Use the correct CPU capability clearing function on the error path in	2022-10-23 10:01:34 -07:00
hwspinlock
hwtracing	Char/Misc and other driver changes for 6.1-rc1	2022-10-08 08:56:37 -07:00
i2c	i2c: mlxbf: depend on ACPI; clean away ifdeffage	2022-10-21 07:59:35 +02:00
i3c	i3c: master: Remove the wrong place of reattach.	2022-10-12 23:45:29 +02:00
idle
iio	Char/Misc and other driver changes for 6.1-rc1	2022-10-08 08:56:37 -07:00
infiniband	treewide: use get_random_u32() when possible	2022-10-11 17:42:58 -06:00
input	Input updates for 6.1 merge window:	2022-10-11 10:53:25 -07:00
interconnect
iommu	iommu/vt-d: Clean up si_domain in the init_dmars() error path	2022-10-21 10:49:35 +02:00
ipack	Char/Misc and other driver changes for 6.1-rc1	2022-10-08 08:56:37 -07:00
irqchip	Interrupt subsystem updates:	2022-10-12 10:23:24 -07:00
isdn	mISDN: hfcpci: Fix use-after-free bug in hfcpci_softirq	2022-10-09 19:11:54 +01:00
leds	This is very quiet release for LEDs, pca963 got blinking support and	2022-10-14 13:14:03 -07:00
macintosh	powerpc updates for 6.1	2022-10-09 14:05:15 -07:00
mailbox	mailbox: qcom-ipcc: flag IRQ NO_THREAD	2022-10-05 21:51:58 -05:00
mcb
md	dm clone: Fix typo in block_device format specifier	2022-10-18 17:17:48 -04:00
media	media fixes for v6.1-rc2	2022-10-22 15:30:15 -07:00
memory
memstick
message
mfd	Revert "mfd: syscon: Remove repetition of the regmap_get_val_endian()"	2022-10-23 12:04:56 -07:00
misc	treewide: use get_random_u32() when possible	2022-10-11 17:42:58 -06:00
mmc	Random number generator fixes for Linux 6.1-rc1.	2022-10-16 15:27:07 -07:00
most
mtd	Random number generator fixes for Linux 6.1-rc1.	2022-10-16 15:27:07 -07:00
mux
net	Networking fixes for 6.1-rc2, including fixes from netfilter	2022-10-20 17:24:59 -07:00
nfc
ntb
nubus
nvdimm	libnvdimm for 6.1	2022-10-14 18:41:41 -07:00
nvme	block-6.1-2022-10-20	2022-10-21 15:14:14 -07:00
nvmem
of	Devicetree updates for v6.1:	2022-10-10 13:13:51 -07:00
opp
parisc	parisc architecture fixes and updates for kernel v6.1-rc1:	2022-10-14 12:10:01 -07:00
parport
pci	Revert "PCI: tegra: Use PCI_CONF1_EXT_ADDRESS() macro"	2022-10-17 12:11:09 -05:00
pcmcia	pcmcia: remove AT91RM9200 Compact Flash driver	2022-09-27 08:12:16 +02:00
peci
perf	arm64 fixes:	2022-10-14 12:38:03 -07:00
phy	pci-v6.1-changes	2022-10-11 11:08:18 -07:00
pinctrl	Interrupt subsystem updates:	2022-10-12 10:23:24 -07:00
platform	LoongArch changes for v6.1	2022-10-12 10:35:20 -07:00
pnp	Merge branches 'acpi-apei', 'acpi-wakeup', 'acpi-reboot' and 'acpi-thermal'	2022-10-10 18:11:11 +02:00
power	power supply and reset changes for the v6.1 series	2022-10-07 11:48:30 -07:00
powercap	Scheduler changes for v6.1:	2022-10-10 09:10:28 -07:00
pps
ps3
ptp	] ptp: ocp: remove symlink for second GNSS	2022-10-10 08:37:24 +01:00
pwm	pwm: Changes for v6.1-rc1	2022-10-07 11:32:10 -07:00
rapidio
ras
regulator	- Core Frameworks	2022-10-07 11:24:20 -07:00
remoteproc	remoteproc: virtio: Fix warning on bindings by removing the of_match_table	2022-10-05 09:20:44 -06:00
reset	Here's the main clk pull request for this merge window. We have some	2022-10-08 10:06:48 -07:00
rpmsg
rtc	RTC for 6.1	2022-10-14 18:36:42 -07:00
s390	s390 updates for the 6.1 merge window #2	2022-10-14 11:36:05 -07:00
sbus
scsi	scsi: lpfc: Fix memory leak in lpfc_create_port()	2022-10-18 02:42:08 +00:00
sh
siox
slimbus
soc	Merge patch series "Use composable cache instead of L2 cache"	2022-10-13 11:07:13 -07:00
soundwire	soundwire updates for 6.1-rc1	2022-10-07 16:13:55 -07:00
spi	spi: Updates for v6.1	2022-10-04 19:36:53 -07:00
spmi	spmi: pmic-arb: increase SPMI transaction timeout delay	2022-09-30 14:33:23 +02:00
ssb
staging	media fixes for v6.1-rc2	2022-10-22 15:30:15 -07:00
target	treewide: use get_random_u32() when possible	2022-10-11 17:42:58 -06:00
tc
tee	- Yu Zhao's Multi-Gen LRU patches are here. They've been under test in	2022-10-10 17:53:04 -07:00
thermal	thermal: intel_powerclamp: Use first online CPU as control_cpu	2022-10-15 19:33:57 +02:00
thunderbolt	treewide: use get_random_u32() when possible	2022-10-11 17:42:58 -06:00
tty	parisc architecture fixes and updates for kernel v6.1-rc1:	2022-10-14 12:10:01 -07:00
ufs	SCSI misc on 20221007	2022-10-07 12:33:18 -07:00
uio
usb	- Yu Zhao's Multi-Gen LRU patches are here. They've been under test in	2022-10-10 17:53:04 -07:00
vdpa	virtio: fixes, features	2022-10-10 14:02:53 -07:00
vfio	VFIO updates for v6.1-rc1	2022-10-12 14:46:48 -07:00
vhost	virtio: fixes, features	2022-10-10 14:02:53 -07:00
video	fbdev/core: Avoid uninitialized read in aperture_remove_conflicting_pci_device()	2022-10-27 09:20:05 +02:00
virt	Char/Misc and other driver changes for 6.1-rc1	2022-10-08 08:56:37 -07:00
virtio	virtio_pci: use irq to detect interrupt support	2022-10-13 09:33:03 -04:00
vlynq
w1	Char/Misc and other driver changes for 6.1-rc1	2022-10-08 08:56:37 -07:00
watchdog	linux-watchdog 6.1-rc2 tag	2022-10-21 12:25:39 -07:00
xen	xen: branch for v6.1-rc2	2022-10-21 14:43:09 -07:00
zorro
Kconfig
Makefile