diff options
| author | Joel Stanley <joel@jms.id.au> | 2020-07-28 04:55:26 +0200 |
|---|---|---|
| committer | Joel Stanley <joel@jms.id.au> | 2020-09-10 04:53:19 +0200 |
| commit | add6895188e49aa6b730d647ca896559370aa2be (patch) | |
| tree | e5f19aabdb693fe9860fc7fe979e1f1fa0775eec /drivers/fsi | |
| parent | fsi: aspeed: Run the bus at maximum speed (diff) | |
| download | linux-add6895188e49aa6b730d647ca896559370aa2be.tar.xz linux-add6895188e49aa6b730d647ca896559370aa2be.zip | |
fsi: aspeed: Add module param for bus divisor
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>
Diffstat (limited to 'drivers/fsi')
| -rw-r--r-- | drivers/fsi/fsi-master-aspeed.c | 8 |
1 files changed, 6 insertions, 2 deletions
diff --git a/drivers/fsi/fsi-master-aspeed.c b/drivers/fsi/fsi-master-aspeed.c index f503f64ab32b..2531e826ba8b 100644 --- a/drivers/fsi/fsi-master-aspeed.c +++ b/drivers/fsi/fsi-master-aspeed.c @@ -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 { |