On Fri, Apr 27, 2018 at 02:58:14AM +0300, Dmitry Osipenko wrote: > Hello, > > This series of patches fixes ULPI USB on Tegra20. The original problem > was reported by Marcel Ziswiler, he found that "ulpi-link" clock was > incorrectly set to CDEV2 instead of PLL_P_OUT4. Marcel made a patch > that changed the "ulpi-link" clock to PLL_P_OUT4 and that fixed issue > with the USB for the devices that have CDEV2 being enabled by bootloader. > The patch got into the kernel and later Marc Dietrich found that USB > stopped working on the "paz00" Tegra20 board. After a bit of discussion > was revealed that PLL_P_OUT4 is the parent clock of the CDEV2 and clock > driver was setting CDEV2's parent incorrectly. The parent clock is actually > determined by the pinmuxing config of CDEV2 pingroup. This patchset fixes > the parent of CDEV2 clock by making Tegra's pinctrl driver a clock provider, > providing CDEV1/2 clock muxes (thanks to Peter De Schrijver for the > suggestion), and then setting these clock muxes as parents for the CDEV1/2 > clocks. In the end Marcel's CDEV2->PLL_P_OUT4 change is reverted since CDEV2 > (aka MCLK2) is the actual clock source for "ulpi-link". > > Dmitry Osipenko (4): > clk: tegra20: Add DEV1/DEV2 OSC dividers > pinctrl: tegra20: Provide CDEV1/2 clock muxes > clk: tegra20: Set correct parents for CDEV1/2 clocks > ARM: dts: tegra20: Revert "Fix ULPI regression on Tegra20" > > arch/arm/boot/dts/tegra20.dtsi | 2 +- > drivers/clk/tegra/clk-tegra20.c | 18 +++++++++++---- > drivers/pinctrl/tegra/pinctrl-tegra.c | 11 --------- > drivers/pinctrl/tegra/pinctrl-tegra.h | 11 +++++++++ > drivers/pinctrl/tegra/pinctrl-tegra20.c | 30 ++++++++++++++++++++++++- > 5 files changed, 55 insertions(+), 17 deletions(-) Stephen, Michael, Linus, as far as I can tell there aren't any build dependencies between the above, so technically these could all be merged through the individual trees. There's a runtime dependency from patch 2 on patch 1 and from patch 3 on patch 2, though I don't think they will cause any actual failures at runtime. But I can also pick this up into the Tegra tree and send out pull requests to you for v4.18 (at around v4.17-rc6), if that's what you prefer. Thierry
Attachment:
signature.asc
Description: PGP signature
