diff options
| author | Cosmin Tanislav <cosmin-gabriel.tanislav.xa@renesas.com> | 2025-11-19 18:14:26 +0200 |
|---|---|---|
| committer | Mark Brown <broonie@kernel.org> | 2025-11-24 14:10:42 +0000 |
| commit | 88782493204512fcf4e020e2385bca3e3c5bd4c0 (patch) | |
| tree | 5a30e5153809282ad5c6d330a1b8d72e6d4cf0f4 | |
| parent | 1b7ce968ab2579702ea9dbc2fb599e540bbd8c88 (diff) | |
spi: rzv2h-rspi: avoid recomputing transfer frequency
Renesas RZ/T2H (R9A09G077) and RZ/N2H (R9A09G087) SoCs have a more
complicated algorithm for calculating the optimal SPI transfer frequency
compared to RZ/V2H, as the clock from which the SPI frequency is
generated supports multiple dividers.
Cache the requested transfer frequency and skip calling
rzv2h_rspi_setup_clock() if it matches the last used one to prepare for
adding support for variable clock frequency handling.
Signed-off-by: Cosmin Tanislav <cosmin-gabriel.tanislav.xa@renesas.com>
Link: https://patch.msgid.link/20251119161434.595677-6-cosmin-gabriel.tanislav.xa@renesas.com
Signed-off-by: Mark Brown <broonie@kernel.org>
| -rw-r--r-- | drivers/spi/spi-rzv2h-rspi.c | 11 |
1 files changed, 8 insertions, 3 deletions
diff --git a/drivers/spi/spi-rzv2h-rspi.c b/drivers/spi/spi-rzv2h-rspi.c index f02f25b98ec6..d7719f3c7b13 100644 --- a/drivers/spi/spi-rzv2h-rspi.c +++ b/drivers/spi/spi-rzv2h-rspi.c @@ -81,6 +81,7 @@ struct rzv2h_rspi_priv { struct clk *tclk; wait_queue_head_t wait; unsigned int bytes_per_word; + u32 last_speed_hz; u32 freq; u16 status; u8 spr; @@ -298,9 +299,13 @@ static int rzv2h_rspi_prepare_message(struct spi_controller *ctlr, rspi->bytes_per_word = roundup_pow_of_two(BITS_TO_BYTES(bits_per_word)); - rspi->freq = rzv2h_rspi_setup_clock(rspi, speed_hz); - if (!rspi->freq) - return -EINVAL; + if (speed_hz != rspi->last_speed_hz) { + rspi->freq = rzv2h_rspi_setup_clock(rspi, speed_hz); + if (!rspi->freq) + return -EINVAL; + + rspi->last_speed_hz = speed_hz; + } writeb(rspi->spr, rspi->base + RSPI_SPBR); |