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authorBenjamin Herrenschmidt <benh@kernel.crashing.org>2018-05-08 11:06:39 +1000
committerBenjamin Herrenschmidt <benh@kernel.crashing.org>2018-06-12 14:04:46 +1000
commit97a4e5c95bf762ac254209dc4808ee5138ee574e (patch)
treeb4bf7fd70cdc3b044e9dabf8c717bb40b84031e5 /drivers/fsi
parentbc1099d2b2519fa0f6c7613d8de398df8438a36b (diff)
downloadlinux-97a4e5c95bf762ac254209dc4808ee5138ee574e.tar.bz2
fsi/fsi-master-gpio: Reduce turnaround clocks
FSI_GPIO_PRIME_SLAVE_CLOCKS is the number of clocks if the "idle" phase between the end of a response and the beginning of the next one. It corresponds to tSendDelay in the FSI specification. The default value in the slave is 16 clocks. 100 is way overkill and significantly reduces the driver performance. This changes it to 20 (which gives the HW a bit of margin still just in case). Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> Reviewed-by: Christopher Bostic <cbostic@linux.vnet.ibm.com> Tested-by: Joel Stanley <joel@jms.id.au>
Diffstat (limited to 'drivers/fsi')
-rw-r--r--drivers/fsi/fsi-master-gpio.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/fsi/fsi-master-gpio.c b/drivers/fsi/fsi-master-gpio.c
index c82bbd35276e..029b0a5b6d89 100644
--- a/drivers/fsi/fsi-master-gpio.c
+++ b/drivers/fsi/fsi-master-gpio.c
@@ -49,7 +49,7 @@
#define FSI_GPIO_CRC_SIZE 4
#define FSI_GPIO_MSG_ID_SIZE 2
#define FSI_GPIO_MSG_RESPID_SIZE 2
-#define FSI_GPIO_PRIME_SLAVE_CLOCKS 100
+#define FSI_GPIO_PRIME_SLAVE_CLOCKS 20
struct fsi_master_gpio {
struct fsi_master master;