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There are 2 Type-c PHYs in RK3399, but only one DP controller. Hence only one PHY can connect to DP controller at one time, the other should be disconnected. The GRF_SOC_CON26 register has a switch bit to do it, set this bit means enable PHY 1, clear this bit means enable PHY 0. If the board has 2 Type-C ports, the DP driver get the phy id from devm_of_phy_get_by_index, and then control this switch according to this id. But some others board only has one Type-C port, it may be PHY 0 or PHY 1. The dts node id can not tell us the correct PHY id. Hence move this switch to PHY driver, the PHY driver can distinguish between PHY 0 and PHY 1, and then write the correct register bit. Signed-off-by: Chris Zhong <zyw@rock-chips.com> Signed-off-by: Enric Balletbo i Serra <enric.balletbo@collabora.com> [The phy-changes are in the phy-tree now and the cdn-dp wasn't enabled at all so far, so this change can go through drm-misc alone without causing issues when testing drm-misc] Signed-off-by: Heiko Stuebner <heiko@sntech.de> Link: https://patchwork.freedesktop.org/patch/msgid/20180216120956.19034-6-enric.balletbo@collabora.com
Linux kernel ============ This file was moved to Documentation/admin-guide/README.rst Please notice that there are several guides for kernel developers and users. These guides can be rendered in a number of formats, like HTML and PDF. In order to build the documentation, use ``make htmldocs`` or ``make pdfdocs``. 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.