[PATCH 04/14] fsi: master-gpio: Rename and adjust send delay

[Benjamin Herrenschmidt]

What the driver called "FSI_GPIO_PRIME_SLAVE_CLOCKS" is what
the FSI spec calls tSendDelay and should be 16 clocks by
default.

Signed-off-by: Benjamin Herrenschmidt <b...@kernel.crashing.org>
---
 drivers/fsi/fsi-master-gpio.c | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/drivers/fsi/fsi-master-gpio.c b/drivers/fsi/fsi-master-gpio.c
index 1fd8b417939d..836587701ceb 100644
--- a/drivers/fsi/fsi-master-gpio.c
+++ b/drivers/fsi/fsi-master-gpio.c
@@ -18,6 +18,7 @@
 
 #define        FSI_GPIO_STD_DLY        1       /* Standard pin delay in nS */
 #define        FSI_ECHO_DELAY_CLOCKS   16      /* Number clocks for echo delay 
*/
+#define        FSI_SEND_DELAY_CLOCKS   16      /* Number clocks for send delay 
*/
 #define        FSI_PRE_BREAK_CLOCKS    50      /* Number clocks to prep for 
break */
 #define        FSI_BREAK_CLOCKS        256     /* Number of clocks to issue 
break */
 #define        FSI_POST_BREAK_CLOCKS   16000   /* Number clocks to set up cfam 
*/
@@ -48,7 +49,6 @@
 #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     20
 
 #define LAST_ADDR_INVALID              0x1
 
@@ -535,9 +535,12 @@ static int poll_for_response(struct fsi_master_gpio 
*master,
        if (busy_count > 0)
                trace_fsi_master_gpio_poll_response_busy(master, busy_count);
  fail:
-       /* Clock the slave enough to be ready for next operation */
+       /*
+        * tSendDelay clocks, avoids signal reflections when switching
+        * from receive of response back to send of data.
+        */
        local_irq_save(flags);
-       clock_zeros(master, FSI_GPIO_PRIME_SLAVE_CLOCKS);
+       clock_zeros(master, FSI_SEND_DELAY_CLOCKS);
        local_irq_restore(flags);
 
        return rc;
-- 
2.17.1