sunxi: mmc: Fix T113-s3 MMC clock divider
On the Allwinner D1/R528/T113-s3 SoCs the MMC clock source selected by
mux value 1 is PLL_PERIPH0(1x), not (2x), as in the other SoCs.
But we have still the hidden divisor of 2 in the MMC mod clock, so
need to explicitly compensate for that on those SoCs.
This leads to the actually programmed clock rate to be double compared
to before, which increases the MMC performance on those SoCs.
Signed-off-by: Andre Przywara <andre.przywara@arm.com>
Reported-by: Kuba Szczodrzyński <kuba@szczodrzynski.pl>
Reviewed-by: Jernej Skrabec <jernej.skrabec@gmail.com>
Reviewed-by: Peng Fan <peng.fan@nxp.com>
diff --git a/drivers/mmc/sunxi_mmc.c b/drivers/mmc/sunxi_mmc.c
index 0b56d14..8f72d75 100644
--- a/drivers/mmc/sunxi_mmc.c
+++ b/drivers/mmc/sunxi_mmc.c
@@ -92,6 +92,13 @@
pll = CCM_MMC_CTRL_PLL6;
pll_hz = clock_get_pll6();
#endif
+ /*
+ * On the D1/R528/T113 mux source 1 refers to PLL_PERIPH0(1x),
+ * like for the older SoCs. However we still have the hidden
+ * divider of 2x, so compensate for that here.
+ */
+ if (IS_ENABLED(CONFIG_MACH_SUN8I_R528))
+ pll_hz /= 2;
}
div = pll_hz / hz;