Commit 97a4e5c9 authored May 08, 2018 by Benjamin Herrenschmidt

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>

parent bc1099d2

drivers/fsi/fsi-master-gpio.c

+1 −1

Original line number	Diff line number	Diff line
		@@ -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;

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