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Kuogee Hsieh 5ae6eb3251 drm/msm/dp: force link training for display resolution change [ Upstream commit `a6e2af64a7` ] Display resolution change is implemented through drm modeset. Older modeset (resolution) has to be disabled first before newer modeset (resolution) can be enabled. Display disable will turn off both pixel clock and main link clock so that main link have to be re-trained during display enable to have new video stream flow again. At current implementation, display enable function manually kicks up irq_hpd_handle which will read panel link status and start link training if link status is not in sync state. However, there is rare case that a particular panel links status keep staying in sync for some period of time after main link had been shut down previously at display disabled. In this case, main link retraining will not be executed by irq_hdp_handle(). Hence video stream of newer display resolution will fail to be transmitted to panel due to main link is not in sync between host and panel. This patch will bypass irq_hpd_handle() in favor of directly call dp_ctrl_on_stream() to always perform link training in regardless of main link status. So that no unexpected exception resolution change failure cases will happen. Also this implementation are more efficient than manual kicking off irq_hpd_handle function. Changes in v2: -- set force_link_train flag on DP only (is_edp == false) Changes in v3: -- revise commit text -- add Fixes tag Changes in v4: -- revise commit text Changes in v5: -- fix spelling at commit text Changes in v6: -- split dp_ctrl_on_stream() for phy test case -- revise commit text for modeset Changes in v7: -- drop 0 assignment at local variable (ret = 0) Changes in v8: -- add patch to remove pixel_rate from dp_ctrl Changes in v9: -- forward declare dp_ctrl_on_stream_phy_test_report() Fixes: `62671d2ef2` ("drm/msm/dp: fixes wrong connection state caused by failure of link train") Signed-off-by: Kuogee Hsieh <quic_khsieh@quicinc.com> Reviewed-by: Stephen Boyd <swboyd@chromium.org> Patchwork: https://patchwork.freedesktop.org/patch/489895/ Link: https://lore.kernel.org/r/1655411200-7255-1-git-send-email-quic_khsieh@quicinc.com Signed-off-by: Rob Clark <robdclark@chromium.org> Signed-off-by: Sasha Levin <sashal@kernel.org>		2022-06-29 09:04:31 +02:00
arch	KVM: arm64: Prevent kmemleak from accessing pKVM memory	2022-06-29 09:04:30 +02:00
block	block: disable the elevator int del_gendisk	2022-06-29 09:04:30 +02:00
certs	certs/blacklist_hashes.c: fix const confusion in certs blacklist	2022-06-22 14:28:03 +02:00
crypto	crypto: memneq - move into lib/	2022-06-22 14:28:06 +02:00
Documentation	dt-bindings: nvmem: sfp: Add clock properties	2022-06-25 15:29:47 +02:00
drivers	drm/msm/dp: force link training for display resolution change	2022-06-29 09:04:31 +02:00
fs	btrfs: add error messages to all unrecognized mount options	2022-06-29 09:04:26 +02:00
include	ata: libata: add qc->flags in ata_qc_complete_template tracepoint	2022-06-29 09:04:27 +02:00
init	gcc-12: disable '-Warray-bounds' universally for now	2022-06-22 14:27:55 +02:00
ipc	ipc/mqueue: use get_tree_nodev() in mqueue_get_tree()	2022-06-09 10:30:30 +02:00
kernel	rethook: Reject getting a rethook if RCU is not watching	2022-06-29 09:04:30 +02:00
lib	crypto: memneq - move into lib/	2022-06-22 14:28:06 +02:00
LICENSES	LICENSES/LGPL-2.1: Add LGPL-2.1-or-later as valid identifiers	2021-12-16 14:33:10 +01:00
mm	mm/slub: add missing TID updates on slab deactivation	2022-06-29 09:04:27 +02:00
net	net/sched: sch_netem: Fix arithmetic in netem_dump() for 32-bit platforms	2022-06-29 09:04:31 +02:00
samples	samples/landlock: Format with clang-format	2022-06-09 10:30:46 +02:00
scripts	faddr2line: Fix overlapping text section failures, the sequel	2022-06-22 14:28:03 +02:00
security	selinux: free contexts previously transferred in selinux_add_opt()	2022-06-22 14:28:10 +02:00
sound	ALSA: hda/realtek: Add quirk for Clevo NS50PU	2022-06-29 09:04:25 +02:00
tools	selftests dma: fix compile error for dma_map_benchmark	2022-06-29 09:04:30 +02:00
usr	Kbuild updates for v5.18	2022-03-31 11:59:03 -07:00
virt	KVM: Free new dirty bitmap if creating a new memslot fails	2022-05-20 13:02:05 -04:00
.clang-format	genirq/msi: Make interrupt allocation less convoluted	2021-12-16 22:22:20 +01:00
.cocciconfig
.get_maintainer.ignore	Opt out of scripts/get_maintainer.pl	2019-05-16 10:53:40 -07:00
.gitattributes	.gitattributes: use 'dts' diff driver for dts files	2019-12-04 19:44:11 -08:00
.gitignore	.gitignore: ignore only top-level modules.builtin	2021-05-02 00:43:35 +09:00
.mailmap	hotfixes for 5.18-rc7	2022-05-13 10:22:37 -07:00
COPYING	COPYING: state that all contributions really are covered by this file	2020-02-10 13:32:20 -08:00
CREDITS	MAINTAINERS: replace a Microchip AT91 maintainer	2022-02-09 11:30:01 +01:00
Kbuild	kbuild: rename hostprogs-y/always to hostprogs/always-y	2020-02-04 01:53:07 +09:00
Kconfig	kbuild: ensure full rebuild when the compiler is updated	2020-05-12 13:28:33 +09:00
MAINTAINERS	MAINTAINERS: Add new IOMMU development mailing list	2022-06-29 09:04:27 +02:00
Makefile	Linux 5.18.7	2022-06-25 15:29:48 +02:00
README

README

Linux kernel
============

There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.

In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``.  The formatted documentation can also be read online at:

    https://www.kernel.org/doc/html/latest/

There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.

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.