[PATCH v2 03/15] spi: Replace if-else-if by bitops and multiplications

Andy Shevchenko
2023-07-10T15:50:04Z

Instead of if-else-if, simply call roundup_pow_of_two(BITS_PER_BYTES()).
Note, there is no division assumed as compiler may optimize it away.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
---
drivers/spi/spi.c | 8 +-------
1 file changed, 1 insertion(+), 7 deletions(-)

diff --git a/drivers/spi/spi.c b/drivers/spi/spi.c
index 6d74218cf38e..125dea8fae00 100644
--- a/drivers/spi/spi.c
+++ b/drivers/spi/spi.c
@@ -3643,13 +3643,7 @@ int spi_split_transfers_maxwords(struct spi_controller *ctlr,
size_t maxsize;
int ret;

- if (xfer->bits_per_word <= 8)
- maxsize = maxwords;
- else if (xfer->bits_per_word <= 16)
- maxsize = 2 * maxwords;
- else
- maxsize = 4 * maxwords;
-
+ maxsize = maxwords * roundup_pow_of_two(BITS_TO_BYTES(xfer->bits_per_word));
if (xfer->len > maxsize) {
ret = __spi_split_transfer_maxsize(ctlr, msg, &xfer,
maxsize, gfp);
--
2.40.0.1.gaa8946217a0b