spi: spi-sun6i: sun6i_spi_transfer_one(): report effectivly used speed_hz of transfer

This patch implementes the reporting of the effectivly used speed_hz for the
transfer by setting tfr->effective_speed_hz.

See the following patch, which adds this feature to the SPI core for more
information:

    5d7e2b5ed585 spi: core: allow reporting the effectivly used speed_hz for a transfer

Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
Acked-by: Maxime Ripard <mripard@kernel.org>
Link: https://lore.kernel.org/r/20200706143443.9855-3-mkl@pengutronix.de
Signed-off-by: Mark Brown <broonie@kernel.org>

diff --git a/drivers/spi/spi-sun6i.c b/drivers/spi/spi-sun6i.c
index fa11cc0..64b4d80 100644 (file)
--- a/drivers/spi/spi-sun6i.c
+++ b/drivers/spi/spi-sun6i.c
@@ -291,9 +291,11 @@ static int sun6i_spi_transfer_one(struct spi_master *master,
        div_cdr2 = DIV_ROUND_UP(div_cdr1, 2);
        if (div_cdr2 <= (SUN6I_CLK_CTL_CDR2_MASK + 1)) {
                reg = SUN6I_CLK_CTL_CDR2(div_cdr2 - 1) | SUN6I_CLK_CTL_DRS;
+               tfr->effective_speed_hz = mclk_rate / (2 * div_cdr2);
        } else {
                div = min(SUN6I_CLK_CTL_CDR1_MASK, order_base_2(div_cdr1));
                reg = SUN6I_CLK_CTL_CDR1(div);
+               tfr->effective_speed_hz = mclk_rate / (1 << div);
        }
 
        sun6i_spi_write(sspi, SUN6I_CLK_CTL_REG, reg);