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It turns out that the fixup from vlv_fixup_mipi_sequences() is necessary
for some DSI panel's with version 2 mipi-sequences too.
Specifically the Acer Iconia One 8 A1-840 (not to be confused with the
A1-840FHD which is different) has the following sequences:
BDB block 53 (1284 bytes) - MIPI sequence block:
Sequence block version v2
Panel 0 *
Sequence 2 - MIPI_SEQ_INIT_OTP
GPIO index 9, source 0, set 0 (0x00)
Delay: 50000 us
GPIO index 9, source 0, set 1 (0x01)
Delay: 6000 us
GPIO index 9, source 0, set 0 (0x00)
Delay: 6000 us
GPIO index 9, source 0, set 1 (0x01)
Delay: 25000 us
Send DCS: Port A, VC 0, LP, Type 39, Length 5, Data ff aa 55 a5 80
Send DCS: Port A, VC 0, LP, Type 39, Length 3, Data 6f 11 00
...
Send DCS: Port A, VC 0, LP, Type 05, Length 1, Data 29
Delay: 120000 us
Sequence 4 - MIPI_SEQ_DISPLAY_OFF
Send DCS: Port A, VC 0, LP, Type 05, Length 1, Data 28
Delay: 105000 us
Send DCS: Port A, VC 0, LP, Type 05, Length 2, Data 10 00
Delay: 10000 us
Sequence 5 - MIPI_SEQ_ASSERT_RESET
Delay: 10000 us
GPIO index 9, source 0, set 0 (0x00)
Notice how there is no MIPI_SEQ_DEASSERT_RESET, instead the deassert
is done at the beginning of MIPI_SEQ_INIT_OTP, which is exactly what
the fixup from vlv_fixup_mipi_sequences() fixes up.
Extend it to also apply to v2 sequences, this fixes the panel not working
on the Acer Iconia One 8 A1-840.
Closes: https://gitlab.freedesktop.org/drm/i915/kernel/-/issues/14605
Signed-off-by: Hans de Goede <hansg@kernel.org>
Acked-by: Jani Nikula <jani.nikula@intel.com>
Link: https://lore.kernel.org/r/20250703143824.7121-1-hansg@kernel.org
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
(cherry picked from commit
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Linux kernel
============
There are several guides for kernel developers and users. These guides can
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Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
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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.