On Sun, Apr 12, 2020 at 10:44:01AM +0200, Geert Uytterhoeven wrote:
Hi Sasha, On Sun, Apr 12, 2020 at 1:11 AM Sasha Levin <sashal@xxxxxxxxxx> wrote:From: Geert Uytterhoeven <geert+renesas@xxxxxxxxx> [ Upstream commit 408324a3c5383716939eea8096a0f999a0665f7e ] SH-Mobile AG5 and R-Car H1 SoCs are based on the Cortex-A9 MPCore, which includes a global timer. Enable the ARM global timer on these SoCs, which will be used for: - the scheduler clock, improving scheduler accuracy from 10 ms to 3 or 4 ns, - delay loops, allowing removal of calls to shmobile_init_delay() from the corresponding machine vectors. Note that when using an old DTB lacking the global timer, the kernel will still work. However, loops-per-jiffies will no longer be preset, and the delay loop will need to be calibrated during boot.I.e. to avoid this delay, this patch is best backported after backporting 8443ffd1bbd5be74 ("ARM: dts: r8a7779: Add device node for ARM global timer"), df1a0aac0a533e6f ("ARM: dts: sh73a0: Add device node for ARM global timer"). While the former has been backported to v5.[45]-stable, the latter hasn't, probably because it depends on 61b58e3f6e518c51 ("ARM: dts: sh73a0: Rename twd clock to periph clock") So please backport the last two commits first.
Done, thanks! -- Thanks, Sasha
