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2352fdb0d3
This commit is a preparation for enabling XUSB SC7 support.
It rearranges Tegra210 XUSB PADCTL UPHY initialization sequence,
for the following reasons:
1. PLLE hardware power sequencer has to be enabled only after both
PEX UPHY PLL and SATA UPHY PLL are initialized.
tegra210_uphy_init() -> tegra210_pex_uphy_enable()
-> tegra210_sata_uphy_enable()
-> tegra210_plle_hw_sequence_start()
-> tegra210_aux_mux_lp0_clamp_disable()
2. At cold boot and SC7 exit, the following bits must be cleared after
PEX/SATA lanes are out of IDDQ (IDDQ_DISABLE=1).
a. XUSB_PADCTL_ELPG_PROGRAM1_AUX_MUX_LP0_CLAMP_EN,
b. XUSB_PADCTL_ELPG_PROGRAM1_AUX_MUX_LP0_CLAMP_EN_EARLY
c. XUSB_PADCTL_ELPG_PROGRAM1_AUX_MUX_LP0_VCORE_DOWN
tegra210_pex_uphy_enable() and tegra210_sata_uphy_enable() are in
charge of bringing lanes out of IDDQ, and then AUX_MUX_LP0_* bits
will be cleared by tegra210_aux_mux_lp0_clamp_disable().
3. Once UPHY PLL hardware power sequencer is enabled, do not assert
reset to PEX/SATA PLLs, otherwise UPHY PLL operation will be broken.
Signed-off-by: JC Kuo <jckuo@nvidia.com>
Acked-By: Vinod Koul <vkoul@kernel.org>
Signed-off-by: Thierry Reding <treding@nvidia.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.