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fsi: master-gpio: Rename and adjust send delay

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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 <benh@kernel.crashing.org>
Reviewed-by: Joel Stanley <joel@jms.id.au>
This commit is contained in:
Benjamin Herrenschmidt 2018-05-29 15:09:45 +10:00
parent a2e7da86cc
commit edc2485148
1 changed files with 6 additions and 3 deletions
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9
drivers/fsi/fsi-master-gpio.c
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@ -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 @@ retry:
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;