On 13.10.23 г. 20:51 ч., Uwe Kleine-König wrote:
Hello,
On Fri, Oct 13, 2023 at 01:13:50PM +0200, Alexander Stein wrote:
Am Freitag, 13. Oktober 2023, 13:04:48 CEST schrieb Stefan Wahren:
Am 13.10.23 um 12:46 schrieb Sean Young:
clk_get_rate() may do a mutex lock. Since the clock rate cannot change on
an rpi, simply fetch it once.
does it mean you checked all possible SoCs (BCM2835, BCM2836, BCM2837,
BCM2711, BCM2712) for this change?
Is it impossible that the real clock can never be influenced by turbo
mode like SPI?
Assuming the clock can change, which I would, then a clock notifier seems
appropriate. See [1] for an example.
I'm not a fan. If the clock changes, the output also changes. With a
clock notifier you can soften the issue and reconfigure to something
similar as the original wave form, but a glitch happens for sure.
Right, but without notifier, everything rate related after the change
will be wrong
Ivo
