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Jacopo Mondi c59dc6cf4f media: ov5640: Re-work MIPI startup sequence commit `aa4bb8b883` upstream. Rework the MIPI interface startup sequence with the following changes: - Remove MIPI bus initialization from the initial settings blob - At set_power(1) time power up MIPI Tx/Rx and set data and clock lanes in LP11 during 'sleep' and 'idle' with MIPI clock in non-continuous mode. - At s_stream time enable/disable the MIPI interface output. - Restore default settings at set_power(0) time. Before this commit the sensor MIPI interface was initialized with settings that require a start/stop sequence at power-up time in order to force lanes into LP11 state, as they were initialized in LP00 when in 'sleep mode', which is assumed to be the sensor manual definition for the D-PHY defined stop mode. The stream start/stop was performed by enabling disabling clock gating, and had the side effect to change the lanes sleep mode configuration when stream was stopped. Clock gating/ungating: - ret = ov5640_mod_reg(sensor, OV5640_REG_MIPI_CTRL00, BIT(5), - on ? 0 : BIT(5)); - if (ret) Set lanes in LP11 when in 'sleep mode': - ret = ov5640_write_reg(sensor, OV5640_REG_PAD_OUTPUT00, - on ? 0x00 : 0x70); This commit fixes an issue reported by Jagan Teki on i.MX6 platforms that prevents the host interface from powering up correctly: https://lkml.org/lkml/2018/6/1/38 It also improves MIPI capture operations stability on my testing platform where MIPI capture often failed and returned all-purple frames. Fixes: `f22996db44` ("media: ov5640: add support of DVP parallel interface") Tested-by: Steve Longerbeam <slongerbeam@gmail.com> (i.MX6q SabreSD, CSI-2) Tested-by: Loic Poulain <loic.poulain@linaro.org> (Dragonboard-410c, CSI-2) Reported-by: Jagan Teki <jagan@amarulasolutions.com> Signed-off-by: Jacopo Mondi <jacopo@jmondi.org> Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com> Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org> Signed-off-by: Adam Ford <aford173@gmail.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>		History 2018-12-01 09:37:34 +01:00
arch	powerpc/numa: Suppress "VPHN is not supported" messages	2018-12-01 09:37:33 +01:00
block	block: copy ioprio in __bio_clone_fast() and bounce	2018-12-01 09:37:32 +01:00
certs	export.h: remove VMLINUX_SYMBOL() and VMLINUX_SYMBOL_STR()	2018-08-22 23:21:44 +09:00
crypto	crypto: simd - correctly take reqsize of wrapped skcipher into account	2018-12-01 09:37:32 +01:00
Documentation	can: hi311x: Use level-triggered interrupt	2018-12-01 09:37:30 +01:00
drivers	media: ov5640: Re-work MIPI startup sequence	2018-12-01 09:37:34 +01:00
firmware	kbuild: remove all dummy assignments to obj-	2017-11-18 11:46:06 +09:00
fs	gfs2: Fix iomap buffer head reference counting bug	2018-12-01 09:37:34 +01:00
include	include/linux/pfn_t.h: force '~' to be parsed as an unary operator	2018-12-01 09:37:34 +01:00
init	Kbuild updates for v4.19 (2nd)	2018-08-25 13:40:38 -07:00
ipc	ipc/shm.c: use ERR_CAST() for shm_lock() error return	2018-10-05 16:32:04 -07:00
kernel	rcu: Make need_resched() respond to urgent RCU-QS needs	2018-12-01 09:37:34 +01:00
lib	lib/raid6: Fix arm64 test build	2018-11-27 16:13:05 +01:00
LICENSES	LICENSES: Remove CC-BY-SA-4.0 license text	2018-10-18 11:28:50 +02:00
mm	mm, page_alloc: check for max order in hot path	2018-12-01 09:37:34 +01:00
net	SUNRPC: Fix a bogus get/put in generic_key_to_expire()	2018-12-01 09:37:33 +01:00
samples	samples: disable CONFIG_SAMPLES for UML	2018-10-11 02:15:46 +09:00
scripts	Revert "scripts/setlocalversion: git: Make -dirty check more robust"	2018-11-27 16:13:08 +01:00
security	selinux: Add __GFP_NOWARN to allocation at str_read()	2018-12-01 09:37:27 +01:00
sound	ALSA: oss: Use kvzalloc() for local buffer allocations	2018-12-01 09:37:25 +01:00
tools	tools/testing/nvdimm: Fix the array size for dimm devices.	2018-12-01 09:37:31 +01:00
usr	initramfs: move gen_initramfs_list.sh from scripts/ to usr/	2018-08-22 23:21:44 +09:00
virt	KVM: arm64: Fix caching of host MDCR_EL2 value	2018-11-13 11:08:47 -08:00
.clang-format	clang-format: Set IndentWrappedFunctionNames false	2018-08-01 18:38:51 +02:00
.cocciconfig	scripts: add Linux .cocciconfig for coccinelle	2016-07-22 12:13:39 +02:00
.get_maintainer.ignore	Add hch to .get_maintainer.ignore	2015-08-21 14:30:10 -07:00
.gitattributes	.gitattributes: set git diff driver for C source code files	2016-10-07 18:46:30 -07:00
.gitignore	Kbuild updates for v4.17 (2nd)	2018-04-15 17:21:30 -07:00
.mailmap	libnvdimm-for-4.19_misc	2018-08-25 18:13:10 -07:00
COPYING	COPYING: use the new text with points to the license files	2018-03-23 12:41:45 -06:00
CREDITS	9p: remove Ron Minnich from MAINTAINERS	2018-08-17 16:20:26 -07:00
Kbuild	Kbuild updates for v4.15	2017-11-17 17:45:29 -08:00
Kconfig	kconfig: move the "Executable file formats" menu to fs/Kconfig.binfmt	2018-08-02 08:06:55 +09:00
MAINTAINERS	MAINTAINERS: Add Sasha as a stable branch maintainer	2018-12-01 09:37:25 +01:00
Makefile	Linux 4.19.5	2018-11-27 16:13:11 +01:00
README	Docs: Added a pointer to the formatted docs to README	2018-03-21 09:02:53 -06:00

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.
See Documentation/00-INDEX for a list of what is contained in each file.

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.