Messages in this thread | | | Subject | Re: [PATCH v4 0/7] ARM: davinci: convert to common clock framework | From | David Lechner <> | Date | Tue, 2 Jan 2018 11:10:50 -0600 |
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On 01/02/2018 09:10 AM, Adam Ford wrote: > On Sun, Dec 31, 2017 at 5:39 PM, David Lechner <david@lechnology.com> wrote: >> This series converts mach-davinci to use the common clock framework. >> >> Basically, this series does some cleanup and rearranging to get things >> ready for the conversion. Then there is a patch to add new driver in >> drivers/clk and finally a patch to make the conversion from the mach >> clock drivers to the new drivers. >> >> I have tested this on LEGO MINDSTORMS EV3 (TI AM1808), so I am confident >> that I haven't broken anything (too badly) in da850. But, I don't have >> other hardware to test. > > I tested this on a DA850-EVM, but I was not able to successfully get it to boot. > > It hangs during boot with no errors, oops's, or panics, but the > standard 4.15.0-rc5 from linux-stable booted just fine. > > Maybe one of the TI guys will have some suggestions, but as-is, it > appears to break at least the DA850-evm. >
Thanks for testing. Unfortunately, the only hardware I have is the LEGO MINDSTORMS, so I will have to rely on others to help with the debugging. If you or anyone else with one of these boards can make the time, please compile with:
CONFIG_DEBUG_LL=y CONFIG_EARLY_PRINTK=y
and add "earlyprintk" to the kernel command line options. You may need to select a different UART for this depending on your board. I think UART1 is the default in the kernel configuration.
On da850 devices comment out the line:
clk_set_parent(clk, pll1_sysclk2_clk);
in da850.c when doing earlyprintk, otherwise the UART1 and UART2 clock source will change during boot and cause garbled output after a point.
>> >> The one thing that I know I have broken is CPU frequency scaling on da850. >> I don't think it was working with device tree anyway, so I can't really test >> it with the hardware I have. I'm hoping that it will be OK to defer fixing >> it and add device tree support at the same time. >> > > I agree with you that it's broken in the device tree, but I don't > think it ever worked. > >> Dependencies: >> * This series applies on top of "ARM: davinici: move watchdog restart from >> mach to drivers" [1][2] >> * On da850, you will also need a patch to prevent problems with the USB PHY >> clocks [3] >> * Or get it all at once: >> git fetch https://github.com/dlech/ev3dev-kernel.git common-clk-v4 > > That is what I pulled to test. > > adam >
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