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According to Synopsys support channel, each region of HSA, HBP and HFP must have minimum number of 10 bytes where constant 4 bytes are for HSS or HSE and 6 bytes are for blanking packet(header + CRC). Hence, the below table comes in. +------------+----------+-------+ | data lanes | min lbcc | bytes | +------------+----------+-------+ | 1 | 10 | 1*10 | +------------+----------+-------+ | 2 | 5 | 2*5 | +------------+----------+-------+ | 3 | 4 | 3*4 | +------------+----------+-------+ | 4 | 3 | 4*3 | +------------+----------+-------+ Implement the minimum lbcc numbers to make sure that the values programmed into DSI_VID_HSA_TIME and DSI_VID_HBP_TIME registers meet the minimum number requirement. For DSI_VID_HLINE_TIME register, it seems that the value programmed should be based on mode->htotal as-is, instead of sum up HSA, HBP, HFP and HDISPLAY. This helps the case where Raydium RM67191 DSI panel is connected, since it's video timing for hsync length is only 2 pixels and without this patch the programmed value for DSI_VID_HSA_TIME is only 2 with 4 data lanes. Signed-off-by: Liu Ying <victor.liu@nxp.com> Reviewed-by: Neil Armstrong <neil.armstrong@linaro.org> Signed-off-by: Robert Foss <rfoss@kernel.org> Link: https://patchwork.freedesktop.org/patch/msgid/20230821034008.3876938-7-victor.liu@nxp.com |
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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.