Quoting Marcin Ziemianowicz (2018-05-08 21:32:05)
On Mon, Apr 30, 2018 at 07:58:47AM +0200, Boris Brezillon wrote:
On Sun, 29 Apr 2018 15:01:11 -0400 Marcin Ziemianowicz marcin@ziemianowicz.com wrote:
When a USB device is connected to the USB host port on the SAM9N12 then you get "-62" error which seems to indicate USB replies from the device are timing out. Based on a logic sniffer, I saw the USB bus was running at half speed.
The PLL code uses cached MUL and DIV values which get set in set_rate() and applied in prepare(), but the recalc_rate() function instead queries the hardware instead of using these cached values. Therefore, if recalc_rate() is called between a set_rate() and prepare(), the wrong frequency is calculated and later the USB clock divider for the SAM9N12 SOC will be configured for an incorrect clock.
In my case, the PLL hardware was set to 96 Mhz before the OHCI driver loads, and therefore the usb clock divider was being set to /2 even though the OHCI driver set the PLL to 48 Mhz.
As an alternative explanation, I noticed this was fixed in the past by 87e2ed338f1b ("clk: at91: fix recalc_rate implementation of PLL driver") but the bug was later re-introduced by 1bdf02326b71 ("clk: at91: make use of syscon/regmap internally").
Fixes: 1bdf02326b71 ("clk: at91: make use of syscon/regmap internally) Cc: stable@vger.kernel.org Signed-off-by: Marcin Ziemianowicz marcin@ziemianowicz.com
Acked-by: Boris Brezillon boris.brezillon@bootlin.com
Apologies for being a bother, but since it's been a bit over a week, should I do something with this now that it has been ACK'd? I was thinking I would see it somewhere on the git group repo but am not seeing it there yet. Googling says that there is a "review cycle" for some maintainers, but I am not clear on if I need to initiate it manually or anything of the sort.
I'll apply it to clk-next. Should appear in linux-next in day or so.