diff options
| author | Pratyush Yadav <p.yadav@ti.com> | 2024-03-09 01:33:53 +0530 |
|---|---|---|
| committer | Praneeth Bajjuri <praneeth@ti.com> | 2024-03-11 13:51:58 -0500 |
| commit | 4fcefeccdc1bef5ea0c86f4a1aab7e1d91744b8f (patch) | |
| tree | 1f7cc0c77db90023ffc72f32055aea77b42ebd40 | |
| parent | e29174df9a8042a26e8898bc46d12961174e9229 (diff) | |
spi: cadence-quadspi: do not use DMA for reads smaller than 16 bytes
For reads this small it does not make a lot of sense to go through DMA
which usually has a significant setup overhead. The benefits of DMA are
reaped in larger transfers. This is especially relevant in case a
register is being polled. The DMA overhead will make the polling slower
than it should be.
Signed-off-by: Pratyush Yadav <p.yadav@ti.com>
Signed-off-by: Vignesh Raghavendra <vigneshr@ti.com>
Signed-off-by: Apurva Nandan <a-nandan@ti.com>
| -rw-r--r-- | drivers/spi/spi-cadence-quadspi.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/spi/spi-cadence-quadspi.c b/drivers/spi/spi-cadence-quadspi.c index 7b89bcf20960..b989e39d0781 100644 --- a/drivers/spi/spi-cadence-quadspi.c +++ b/drivers/spi/spi-cadence-quadspi.c @@ -2062,7 +2062,7 @@ static int cqspi_direct_read_execute(struct cqspi_flash_pdata *f_pdata, u_char *buf = op->data.buf.in; int ret; - if (!cqspi->rx_chan || !virt_addr_valid(buf)) { + if (!cqspi->rx_chan || !virt_addr_valid(buf) || len <= 16) { cqspi_memcpy_fromio(op, buf, cqspi->ahb_base + from, len); return 0; } |