diff --git a/drivers/spi/spi-sun4i.c b/drivers/spi/spi-sun4i.c
index 18951c1972da..fff0065ce9af 100644
--- a/drivers/spi/spi-sun4i.c
+++ b/drivers/spi/spi-sun4i.c
@@ -300,9 +300,11 @@ static int sun4i_spi_transfer_one(struct spi_controller *host,
 	div_cdr2 = DIV_ROUND_UP(div_cdr1, 2);
 	if (div_cdr2 <= (SUN4I_CLK_CTL_CDR2_MASK + 1)) {
 		reg = SUN4I_CLK_CTL_CDR2(div_cdr2 - 1) | SUN4I_CLK_CTL_DRS;
+		tfr->effective_speed_hz = mclk_rate / (2 * div_cdr2);
 	} else {
 		div = min(SUN4I_CLK_CTL_CDR1_MASK, order_base_2(div_cdr1));
 		reg = SUN4I_CLK_CTL_CDR1(div);
+		tfr->effective_speed_hz = mclk_rate / (1 << div);
 	}
 
 	sun4i_spi_write(sspi, SUN4I_CLK_CTL_REG, reg);