Messages in this thread | | | Date | Mon, 16 Jun 2014 12:52:10 -0600 | From | Stephen Warren <> | Subject | Re: [PATCH 0/3] Use Tegra's microsecond counter for udelay() |
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On 06/12/2014 09:58 AM, Peter De Schrijver wrote: > This patchset introduces support for Tegra's microsecond counter as the > udelay() timer. This is useful on Tegra SoCs which do not have an arch timer > such as Tegra20 and Tegra30. Using the microsecond counter instead of a delay > based loop avoids potential problems during cpu frequency changes. > > The set consists of 3 patches: > > Patch 1 introduces a new call which is used by the ARM architecture delay > timer code to prevent changing the delay timer after calibration is finished > and thus can be in use. > > Patch 2 adds logic to choose the delay timer with the highest resolution. This > allows the same registration code to be used on all Tegra SoCs and yet use the > higher resolution arch timer when available (eg on Tegra114 or Tegra124). > > Patch 3 adds the actual delay timer code. > > Patch set has been verified on ventana (Tegra20), beaver (Tegra30), > dalmore (Tegra114) and jetson TK1 (Tegra124).
I've applied this series to Tegra's for-3.17/delay-timer branch.
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