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spi: rspi: Fill in spi_transfer.effective_speed_hz

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Fill in the effective bit rate used for transfers, so the SPI core can
calculate instead of estimate delays.

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Link: https://lore.kernel.org/r/20200819125904.20938-7-geert+renesas@glider.be
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Geert Uytterhoeven 2020-08-19 14:59:03 +02:00 committed by Mark Brown
parent 6a195f24f3
commit cb58825414
No known key found for this signature in database
GPG Key ID: 24D68B725D5487D0
1 changed files with 6 additions and 0 deletions
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6
drivers/spi/spi-rspi.c
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@ -262,6 +262,7 @@ static void rspi_set_rate(struct rspi_data *rspi)
rspi_write8(rspi, clamp(spbr, 0, 255), RSPI_SPBR);
rspi->spcmd |= SPCMD_BRDV(brdv);
rspi->speed_hz = DIV_ROUND_UP(clksrc, (2U << brdv) * (spbr + 1));
}
/*
@ -344,6 +345,7 @@ static int qspi_set_config_register(struct rspi_data *rspi, int access_size)
clksrc = clk_get_rate(rspi->clk);
if (rspi->speed_hz >= clksrc) {
spbr = 0;
rspi->speed_hz = clksrc;
} else {
spbr = DIV_ROUND_UP(clksrc, 2 * rspi->speed_hz);
while (spbr > 255 && brdv < 3) {
@ -351,6 +353,7 @@ static int qspi_set_config_register(struct rspi_data *rspi, int access_size)
spbr = DIV_ROUND_UP(spbr, 2);
}
spbr = clamp(spbr, 0, 255);
rspi->speed_hz = DIV_ROUND_UP(clksrc, (2U << brdv) * spbr);
}
rspi_write8(rspi, spbr, RSPI_SPBR);
rspi->spcmd |= SPCMD_BRDV(brdv);
@ -698,6 +701,8 @@ static int rspi_common_transfer(struct rspi_data *rspi,
{
int ret;
xfer->effective_speed_hz = rspi->speed_hz;
ret = rspi_dma_check_then_transfer(rspi, xfer);
if (ret != -EAGAIN)
return ret;
@ -853,6 +858,7 @@ static int qspi_transfer_one(struct spi_controller *ctlr,
{
struct rspi_data *rspi = spi_controller_get_devdata(ctlr);
xfer->effective_speed_hz = rspi->speed_hz;
if (spi->mode & SPI_LOOP) {
return qspi_transfer_out_in(rspi, xfer);
} else if (xfer->tx_nbits > SPI_NBITS_SINGLE) {