diff options
| author | Chiranjeevi Rapolu <chiranjeevi.rapolu@intel.com> | 2014-10-29 17:26:05 -0700 |
|---|---|---|
| committer | Stefan Reinauer <stefan.reinauer@coreboot.org> | 2015-04-10 19:31:33 +0200 |
| commit | 1164d51828c0edae56376b9ebcbb910e577ed748 (patch) | |
| tree | 06035fc54e55355476e0ad0c29af2a1077b6c900 /src/soc | |
| parent | aec2442f3cd6c9bdbf998be710e8af056e8d33c4 (diff) | |
broadwell: Increase I2C SDA hold timing to 300ns
I2C bus SDA hold time can be marginal with 60ns value, especially
when there is level shifter on the bus. So program it to 300ns
based on Fast-mode specification, which is between 0 to 900ns.
Apply the same timing for Standard-mode as well.
Refer to original bug on BayTrail chrome-os-partner:28092, this
is to carry forward the fix to Broadwell.
BRANCH=chromeos-2013.04
BUG=chrome-os-partner:33378
TEST=suspend resume test, watch for I2C errors
Change-Id: I93200b141602163903f5c9f52b94013bcf3382a5
Signed-off-by: Stefan Reinauer <reinauer@chromium.org>
Original-Commit-Id: 72b82a1d5d836594e7d0f95972cc0dc91ae7ff8c
Original-Change-Id: I995d6868a44f2578a6d0b18dd5e8548f3c3cd494
Original-Signed-off-by: Chiranjeevi Rapolu <chiranjeevi.rapolu@intel.com>
Original-Reviewed-on: https://chromium-review.googlesource.com/226386
Original-Reviewed-by: Wenkai Du <wenkai.du@intel.com>
Original-Reviewed-by: Duncan Laurie <dlaurie@chromium.org>
Reviewed-on: http://review.coreboot.org/9467
Tested-by: build bot (Jenkins)
Reviewed-by: Patrick Georgi <pgeorgi@google.com>
Diffstat (limited to 'src/soc')
| -rw-r--r-- | src/soc/intel/broadwell/acpi/serialio.asl | 8 |
1 files changed, 4 insertions, 4 deletions
diff --git a/src/soc/intel/broadwell/acpi/serialio.asl b/src/soc/intel/broadwell/acpi/serialio.asl index 6b42d54024..7ffc671a74 100644 --- a/src/soc/intel/broadwell/acpi/serialio.asl +++ b/src/soc/intel/broadwell/acpi/serialio.asl @@ -205,8 +205,8 @@ Device (I2C0) Name (_UID, 1) Name (_ADR, 0x00150001) - Name (SSCN, Package () { 432, 507, 9 }) - Name (FMCN, Package () { 72, 160, 9 }) + Name (SSCN, Package () { 432, 507, 30 }) + Name (FMCN, Package () { 72, 160, 30 }) // BAR0 is assigned during PCI enumeration and saved into NVS Name (RBUF, ResourceTemplate () @@ -276,8 +276,8 @@ Device (I2C1) Name (_UID, 1) Name (_ADR, 0x00150002) - Name (SSCN, Package () { 432, 507, 9 }) - Name (FMCN, Package () { 72, 160, 9 }) + Name (SSCN, Package () { 432, 507, 30 }) + Name (FMCN, Package () { 72, 160, 30 }) // BAR0 is assigned during PCI enumeration and saved into NVS Name (RBUF, ResourceTemplate () |