When use new timings,all speed mode requires a doubled module clock
if speed mode is ddr,requires a four times module clock
When use old timings,only 8 bit ddr requires a doubled module clock
Signed-off-by: Michael Wu <michael@xxxxxxxxxxxxxxxxx>
---
drivers/mmc/host/sunxi-mmc.c | 27 +++++++++++++++------------
1 file changed, 15 insertions(+), 12 deletions(-)
diff --git a/drivers/mmc/host/sunxi-mmc.c b/drivers/mmc/host/sunxi-mmc.c
index afeefead6501..7b47ec453fb6 100644
--- a/drivers/mmc/host/sunxi-mmc.c
+++ b/drivers/mmc/host/sunxi-mmc.c
@@ -774,20 +774,23 @@ static int sunxi_mmc_clk_set_rate(struct sunxi_mmc_host *host,
if (!ios->clock)
return 0;
- /*
- * Under the old timing mode, 8 bit DDR requires the module
- * clock to be double the card clock. Under the new timing
- * mode, all DDR modes require a doubled module clock.
- *
- * We currently only support the standard MMC DDR52 mode.
- * This block should be updated once support for other DDR
- * modes is added.
+ /**
+ * When use new timings, all speed mode requires a doubled module clock.
+ * if speed mode is ddr, requires a four times module clock.
+ * When use old timings, only 8 bit ddr requires a doubled module clock.
*/
- if (ios->timing == MMC_TIMING_MMC_DDR52 &&
- (host->use_new_timings ||
- ios->bus_width == MMC_BUS_WIDTH_8)) {
- div = 2;
+ if (host->use_new_timings) {
clock <<= 1;
+ if (ios->timing == MMC_TIMING_MMC_DDR52) {
+ div = 2;
+ clock <<= 1;
+ }
+ } else {
+ if (ios->timing == MMC_TIMING_MMC_DDR52 &&
+ (ios->bus_width == MMC_BUS_WIDTH_8)) {
+ div = 2;
+ clock <<= 1;
+ }
}
if (host->use_new_timings && host->cfg->ccu_has_timings_switch) {
--
2.29.0
