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soc/qualcomm: Update the wait time for checking PCIe link up 

Currently, after the PCIe link is initialized, we wait 100ms every
time the link is not up anymore.  However, this causes significant
delay.  Assuming the first check is false, we'd like to increase the
frequency of checks for the link to be up.  Changing to check every
10ms instead.  This seems to save about 90ms in the device
configuration stage of bootup on herobrine.

BUG=b:218406702
BRANCH=None
TEST=reboot from AP console (on herobrine)
     prior to fix (from cbmem dump):
         40:device configuration 919,391 (202,861)
     after fix (from cbmem dump):
         40:device configuration 826,294 (112,729)

Change-Id: Ic67e7207c1e9f589b34705dc24f5d1ea423e2d56
Signed-off-by: Shelley Chen <shchen@google.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/67884
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Tim Wawrzynczak <inforichland@gmail.com>
Reviewed-by: mturney mturney <quic_mturney@quicinc.com>
Reviewed-by: Douglas Anderson <dianders@chromium.org>
This commit is contained in:
Shelley Chen 2022-09-26 17:27:40 -07:00
parent 9baffae485
commit 4b5ba94363
1 changed files with 2 additions and 2 deletions
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4
src/soc/qualcomm/common/include/soc/pcie.h
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@ -48,8 +48,8 @@
#define LINK_SPEED_GEN_1 0x1
#define LINK_SPEED_GEN_2 0x2
#define LINK_SPEED_GEN_3 0x3
#define PCIE_LINK_UP_MS 100
#define LINK_WAIT_MAX_RETRIES 10
#define PCIE_LINK_UP_MS 10
#define LINK_WAIT_MAX_RETRIES 100
#define COMMAND_MASK 0xffff