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fsi: aspeed: Add module param for bus divisor

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For testing and hardware debugging a user may wish to override the
divisor at runtime. By setting fsi_master_aspeed.bus_div=N, the divisor
will be set to N, if 0 < N <= 0x3ff.

This is a module parameter and not a device tree option as it will only
need to be set when testing or debugging.

Reviewed-by: Eddie James <eajames@linux.ibm.com>
Link: https://lore.kernel.org/r/20200728025527.174503-5-joel@jms.id.au
Signed-off-by: Joel Stanley <joel@jms.id.au>
This commit is contained in:
Joel Stanley 2020-07-28 12:25:26 +09:30
parent 4a80c2017b
commit add6895188
1 changed files with 6 additions and 2 deletions
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8
drivers/fsi/fsi-master-aspeed.c
View file

@ -87,6 +87,7 @@ static const u32 fsi_base = 0xa0000000;
#define FSI_DIVISOR_DEFAULT 1
#define FSI_DIVISOR_CABLED 2
static u16 aspeed_fsi_divisor = FSI_DIVISOR_DEFAULT;
module_param_named(bus_div,aspeed_fsi_divisor, ushort, 0);
#define OPB_POLL_TIMEOUT 10000
@ -454,9 +455,12 @@ static int tacoma_cabled_fsi_fixup(struct device *dev)
if (gpio) {
/*
* Cable signal integrity means we should run the bus
* slightly slower
* slightly slower. Do not override if a kernel param
* has already overridden.
*/
aspeed_fsi_divisor = FSI_DIVISOR_CABLED;
if (aspeed_fsi_divisor == FSI_DIVISOR_DEFAULT)
aspeed_fsi_divisor = FSI_DIVISOR_CABLED;
gpiod_direction_output(mux_gpio, 0);
dev_info(dev, "FSI configured for external cable\n");
} else {