Convert clk_enable/clk_disable to clk_prepare_enable/clk_disable_unprepare
calls as required by common clock framework.
Signed-off-by: Jingoo Han <jg1.han@samsung.com>
Signed-off-by: Florian Tobias Schandinat <FlorianSchandinat@gmx.de>
To check channel equalization, the value of LANE_ALIGN_STATUS_UPDATED is
necessary in exynos_dp_channel_eq_ok(). Also, link_align includes this value.
However, link_status does not include this value, so it makes the problem
that channel equalization is failed during link training.
Signed-off-by: Jingoo Han <jg1.han@samsung.com>
Signed-off-by: Florian Tobias Schandinat <FlorianSchandinat@gmx.de>
SW reset sets DP TX to initial value, so configurations for analog parameter
and interrupt are not set properly. Therefore, exynos_dp_init_analog_param()
and exynos_dp_init_interrupt() should be moved to after sw reset is called,
in order to set these values properly.
Signed-off-by: Jingoo Han <jg1.han@samsung.com>
Signed-off-by: Florian Tobias Schandinat <FlorianSchandinat@gmx.de>
The devm_clk_get function allocates memory that is released when a driver
detaches. This patch uses this function for data that is allocated in the probe
function of a platform device and is only freed in the remove function.
Additionally, this patch removes a null check after platform_get_resource that
is redundant with the one done by devm_request_and_ioremap.
Signed-off-by: Damien Cassou <damien.cassou@lifl.fr>
Acked-by: Jingoo Han <jg1.han@samsung.com>
Signed-off-by: Florian Tobias Schandinat <FlorianSchandinat@gmx.de>
This patch adds adjustement for voltage swing and pre-emphasis during
Link Training procedure. According to the DP specification, unless all
the LANEx_CR_DONE bits are set, the transmitter must read
the ADJUST_REQUEST_LANEx_x, increase the voltage swing according to
the request, and update the TRAINING_LANEx_SET bytes to match the new
voltage swing setting.
Refer to the DP specification v1.1a, Section 3.5.1.3 Link Training.
Signed-off-by: Jingoo Han <jg1.han@samsung.com>
Signed-off-by: Florian Tobias Schandinat <FlorianSchandinat@gmx.de>
This patch replaces udelay and mdelay with usleep_range to remove
the busy loop waiting.
Signed-off-by: Jingoo Han <jg1.han@samsung.com>
Signed-off-by: Florian Tobias Schandinat <FlorianSchandinat@gmx.de>
The only INTERLANE_ALIGN_DONE bit should be checked for channel equalization
during Link Training. Previously, the other bits such as LINK_STATUS_UPDATED
were checked, and channel equalization procedure was repeated unnecessarily.
Signed-off-by: Jingoo Han <jg1.han@samsung.com>
Signed-off-by: Florian Tobias Schandinat <FlorianSchandinat@gmx.de>
Wrong DPCD addresses were used for clock recovery during Link Training.
The training pattern should be set by TRAINING_PATTERN_SET (0x102), while
voltage swing and pre-emphasis should be set by TRAINING_LANE0_SET (0x103).
Signed-off-by: Jingoo Han <jg1.han@samsung.com>
Signed-off-by: Florian Tobias Schandinat <FlorianSchandinat@gmx.de>
This patch fixes build warning due to uninitialized value dereference.
drivers/video/exynos/exynos_dp_core.c: In function 'exynos_dp_set_link_train':
drivers/video/exynos/exynos_dp_core.c:529:18: warning: 'reg' may be used uninitialized in this function [-Wuninitialized]
drivers/video/exynos/exynos_dp_core.c:395:6: note: 'reg' was declared here
Signed-off-by: Olof Johansson <olof@lixom.net>
Signed-off-by: Jingoo Han <jg1.han@samsung.com>
Signed-off-by: Florian Tobias Schandinat <FlorianSchandinat@gmx.de>
This patch reduces delay time when configuring video setting,
which is helpful to reduce wakeup time during resume.
Signed-off-by: Jingoo Han <jg1.han@samsung.com>
Signed-off-by: Florian Tobias Schandinat <FlorianSchandinat@gmx.de>
The sw reset should be called prioir to enabling sw defined function,
according to datasheet.
Signed-off-by: Jingoo Han <jg1.han@samsung.com>
Signed-off-by: Florian Tobias Schandinat <FlorianSchandinat@gmx.de>
The devm_ functions allocate memory that is released when a driver
detaches. This makes the code smaller and a bit simpler.
Signed-off-by: Jingoo Han <jg1.han@samsung.com>
Signed-off-by: Florian Tobias Schandinat <FlorianSchandinat@gmx.de>
Remove unnecessary headers from the file.
Signed-off-by: Jingoo Han <jg1.han@samsung.com>
Signed-off-by: Florian Tobias Schandinat <FlorianSchandinat@gmx.de>
The char pointer for adjust_request variable is replaced with char array
to fix possible null pointer dereference when clock recovery is failed.
Signed-off-by: Jingoo Han <jg1.han@samsung.com>
Signed-off-by: Florian Tobias Schandinat <FlorianSchandinat@gmx.de>
Samsung EXYNOS SoC such Exynos5 has DP controller and embedded DP
panel can be used. This patch supports DP driver based on Samsung
EXYNOS SoC chip.
Signed-off-by: Jingoo Han <jg1.han@samsung.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Florian Tobias Schandinat <FlorianSchandinat@gmx.de>
Jingoo Han