From: "Rebecca Cran" <quic_rcran@quicinc.com>
To: <devel@edk2.groups.io>, Pierre Gondois <pierre.gondois@arm.com>,
"Ard Biesheuvel" <ardb+tianocore@kernel.org>,
Sami Mujawar <sami.mujawar@arm.com>,
Thomas Abraham <thomas.abraham@arm.com>
Cc: Rebecca Cran <rebecca@quicinc.com>
Subject: [PATCH edk2-platforms v2 0/2] Platform/ARM/JunoPkg: Timer fixes
Date: Mon, 20 Feb 2023 18:02:40 -0700 [thread overview]
Message-ID: <20230221010242.1038521-1-rebecca@quicinc.com> (raw)
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.
Changes in v2:
Dropped the patch to set PcdTimerPeriod.
Rebecca Cran (2):
Platform/ARM/JunoPkg: Switch to MdeModulePkg/Universal/Metronome
driver
Platform/ARM/JunoPkg: Set PcdArmArchTimerFreqInHz to 0 to read from
CNTFRQ_EL0
Platform/ARM/JunoPkg/ArmJuno.dsc | 6 +++---
Platform/ARM/JunoPkg/ArmJuno.fdf | 2 +-
2 files changed, 4 insertions(+), 4 deletions(-)
--
2.30.2
next reply other threads:[~2023-02-21 1:03 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-02-21 1:02 Rebecca Cran [this message]
2023-02-21 1:02 ` [PATCH edk2-platforms v2 1/2] Platform/ARM/JunoPkg: Switch to MdeModulePkg/Universal/Metronome driver Rebecca Cran
2023-02-21 8:44 ` Ard Biesheuvel
2023-02-21 1:02 ` [PATCH edk2-platforms v2 2/2] Platform/ARM/JunoPkg: Set PcdArmArchTimerFreqInHz to 0 to read from CNTFRQ_EL0 Rebecca Cran
2023-02-21 8:49 ` [PATCH edk2-platforms v2 0/2] Platform/ARM/JunoPkg: Timer fixes Ard Biesheuvel
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