kernel: GPIO and soft FSI stability and speed improvements

Benjamin Herrenschmidt (7):
      gpio/aspeed: Set output latch before changing direction
      gpio/aspeed: Use a cache of output data registers
      fsi/fsi-master-gpio: Sample input data on different clock phase
      fsi/fsi-master-gpio: Add "no-gpio-delays" option
      fsi/fsi-master-gpio: Reduce turnaround clocks
      fsi/fsi-master-gpio: Reduce dpoll clocks
      fsi/fsi-master-gpio: Delay sampling of FSI data input

Change-Id: Ic1e1a6de36a5148a9c343eca1119840cdfae67a5
Signed-off-by: Joel Stanley <joel@jms.id.au>
diff --git a/meta-phosphor/common/recipes-kernel/linux/linux-obmc_4.13.bb b/meta-phosphor/common/recipes-kernel/linux/linux-obmc_4.13.bb
index c77e29b..b747d8d 100644
--- a/meta-phosphor/common/recipes-kernel/linux/linux-obmc_4.13.bb
+++ b/meta-phosphor/common/recipes-kernel/linux/linux-obmc_4.13.bb
@@ -1,6 +1,6 @@
 KBRANCH ?= "dev-4.13"
 LINUX_VERSION ?= "4.13.16"
 
-SRCREV="468cbec6d2c91239332cb91b1f0a73aafcb6f0c6"
+SRCREV="28d817669a3e3ceea2379333eef7a7a37fc9432a"
 
 require linux-obmc.inc