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Neil Armstrong 93c97bc8d8 drm/msm: dsi: fix PLL init in bonded mode
When in bonded DSI mode, only one PLL in one DSI PHY is used for both
DSI PHYs, meaning that parents of the secondary DSI PHY will use the
primary DSI PHY PLL as parent.

In this case the primary DSI PHY PLL will be set even if the primary
DSI PHY is not yet enabled. The DSI PHY code has support for this
particular use-case and will handle the fact the PLL was already
set when initializing the primary DSI PHY.

By introducing a protected variable pll_enable_cnt in the commit
cb55f39bf7 ("drm/msm/dsi/phy: Fix reading zero as PLL rates when unprepared"),
this variable is only initially set to 1 when the DSI PHY is initialized
making it impossible to set the PLL before, breaking the bonded DSI
use case by returning 0 when setting the PLL from the secondary DSI
PHY driver and skipping the correct clocks initialization.

But since it was already possible to set the PLL without enabling
the DSI PHY, just drop the pll_enable_cnt setting from the PHY
enable/disable and simply increment/decrement the pll_enable_cnt
variable from the dsi_pll_enable/disable_pll_bias to make sure any
PLL operation is done with the PLL BIAS enabled.

Fixes: cb55f39bf7 ("drm/msm/dsi/phy: Fix reading zero as PLL rates when unprepared")
Closes: https://lore.kernel.org/all/50a49d72-2b1e-471d-b0c4-d5a0b38b2a21@linaro.org/
Tested-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Signed-off-by: Neil Armstrong <neil.armstrong@linaro.org>
Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>
Patchwork: https://patchwork.freedesktop.org/patch/683688/
Link: https://lore.kernel.org/r/20251027-topic-sm8x50-fix-dsi-bonded-v1-1-a477cd3f907d@linaro.org
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>
2025-10-29 00:10:06 +02:00
arch drm-misc-next for 6.17: 2025-06-27 09:58:05 +10:00
block block-6.16-20250614 2025-06-14 09:25:22 -07:00
certs sign-file,extract-cert: use pkcs11 provider for OPENSSL MAJOR >= 3 2024-09-20 19:52:48 +03:00
crypto crypto: hkdf - move to late_initcall 2025-06-11 10:59:45 +08:00
Documentation dt-bindings: display/msm/gpu: describe A505 clocks 2025-09-08 07:24:58 -07:00
drivers drm/msm: dsi: fix PLL init in bonded mode 2025-10-29 00:10:06 +02:00
fs three smb3 client fixes 2025-06-14 10:13:32 -07:00
include soc: qcom: ubwc: Add #defines for UBWC swizzle bits 2025-07-04 17:48:40 -07:00
init init: fix build warnings about export.h 2025-06-11 22:42:36 -07:00
io_uring io_uring-6.16-20250614 2025-06-14 08:44:54 -07:00
ipc - The 3 patch series "hung_task: extend blocking task stacktrace dump to 2025-05-31 19:12:53 -07:00
kernel posix-cpu-timers: fix race between handle_posix_cpu_timers() and posix_cpu_timer_del() 2025-06-13 10:55:49 -07:00
lib scatterlist: fix extraneous '@'-sign kernel-doc notation 2025-06-11 22:42:35 -07:00
LICENSES LICENSES: add CC0-1.0 license text 2025-05-21 14:54:17 +02:00
mm 9 hotfixes. 3 are cc:stable and the remainder address post-6.15 issues 2025-06-14 08:18:09 -07:00
net Including fixes from bluetooth and wireless. 2025-06-12 09:50:36 -07:00
rust Rust fixes for v6.16 2025-06-14 08:38:34 -07:00
samples - The 3 patch series "hung_task: extend blocking task stacktrace dump to 2025-05-31 19:12:53 -07:00
scripts gendwarfksyms: Fix structure type overrides 2025-06-16 00:49:48 +09:00
security KEYS: Invert FINAL_PUT bit 2025-06-11 11:57:14 -07:00
sound treewide, timers: Rename from_timer() to timer_container_of() 2025-06-08 09:07:37 +02:00
tools 9 hotfixes. 3 are cc:stable and the remainder address post-6.15 issues 2025-06-14 08:18:09 -07:00
usr usr/include: openrisc: don't HDRTEST bpf_perf_event.h 2025-05-12 15:03:17 +09:00
virt Merge branch 'kvm-lockdep-common' into HEAD 2025-05-28 06:29:17 -04:00
.clang-format Linux 6.15-rc5 2025-05-06 16:39:25 +10:00
.clippy.toml rust: clean Rust 1.88.0's warning about clippy::disallowed_macros configuration 2025-05-07 00:11:47 +02:00
.cocciconfig
.editorconfig .editorconfig: remove trim_trailing_whitespace option 2024-06-13 16:47:52 +02:00
.get_maintainer.ignore MAINTAINERS: Retire Ralf Baechle 2024-11-12 15:48:59 +01:00
.gitattributes .gitattributes: set diff driver for Rust source code files 2023-05-31 17:48:25 +02:00
.gitignore .gitignore: ignore Python compiled bytecode 2025-04-24 10:12:46 -06:00
.mailmap Including fixes from bluetooth and wireless. 2025-06-12 09:50:36 -07:00
.pylintrc docs: add a .pylintrc file with sys path for docs scripts 2025-04-09 12:10:33 -06:00
.rustfmt.toml rust: add .rustfmt.toml 2022-09-28 09:02:20 +02:00
COPYING COPYING: state that all contributions really are covered by this file 2020-02-10 13:32:20 -08:00
CREDITS Update Christoph's Email address and make it consistent 2025-05-12 23:50:31 -07:00
Kbuild drm: ensure drm headers are self-contained and pass kernel-doc 2025-02-12 10:44:43 +02:00
Kconfig io_uring: Rename KConfig to Kconfig 2025-02-19 14:53:27 -07:00
MAINTAINERS drm-misc-next for 6.17: 2025-06-18 08:09:35 +10:00
Makefile Linux 6.16-rc2 2025-06-15 13:49:41 -07:00
README README: Fix spelling 2024-03-18 03:36:32 -06:00

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 reStructuredText 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.