Re: [PATCH] clocksource/drivers/riscv: Increase the clock source rating

From: Daniel Lezcano
Date: Wed Jan 04 2023 - 17:29:14 EST


On 28/12/2022 01:44, Samuel Holland wrote:
RISC-V provides an architectural clock source via the time CSR. This
clock source exposes a 64-bit counter synchronized across all CPUs.
Because it is accessed using a CSR, it is much more efficient to read
than MMIO clock sources. For example, on the Allwinner D1, reading the
sun4i timer in a loop takes 131 cycles/iteration, while reading the
RISC-V time CSR takes only 5 cycles/iteration.

Adjust the RISC-V clock source rating so it is preferred over the
various platform-specific MMIO clock sources.

Signed-off-by: Samuel Holland <samuel@xxxxxxxxxxxx>
---
Applied, thanks

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