[v1] Platform/ARM/JunoPkg: Timer fixes

[edk2-devel] [PATCH edk2-platforms 0/3] Platform/ARM/JunoPkg: Timer fixes

Rebecca Cran posted 3 patches 1 year, 4 months ago

Diff against v2
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Platform/ARM/JunoPkg/ArmJuno.dsc | 7 ++++---
Platform/ARM/JunoPkg/ArmJuno.fdf | 2 +-
2 files changed, 5 insertions(+), 4 deletions(-)

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[edk2-devel] [PATCH edk2-platforms 0/3] Platform/ARM/JunoPkg: Timer fixes

Posted by Rebecca Cran 1 year, 4 months ago

The use of the EmbeddedPkg/MetronomeDxe driver on Juno can cause problems
with drivers that use gBS->Stall, since it takes 10x longer than
requested. For example requesting a timeout of 1 ms when doing a USB 
bulk transfer results in it taking 100 ms. Switching to the
MdeModulePkg/Universal/Metronome driver fixes this since it assumes the
timer clock ticks at least every 100 ns.

While here, set the PCD value of the timer frequency to 0 so it gets
read from the SoC instead of hard-coding it.

Also, fix the time between interrupts in TimerDxe to be 1 ms as
the driver wants.

Rebecca Cran (3):
  Platform/ARM/JunoPkg: Switch to MdeModulePkg/Universal/Metronome
    driver
  Platform/ARM/JunoPkg: Override PcdTimerPeriod to be 10000
  Platform/ARM/JunoPkg: Set PcdArmArchTimerFreqInHz to 0 to read from
    CNTFRQ_EL0

 Platform/ARM/JunoPkg/ArmJuno.dsc | 7 ++++---
 Platform/ARM/JunoPkg/ArmJuno.fdf | 2 +-
 2 files changed, 5 insertions(+), 4 deletions(-)

-- 
2.30.2



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