Respect the actual clock for mmc debugfs to help better debug
the hardware.
mmc_host mmc0: Bus speed (slot 0) = 135475200Hz (slot req 150000000Hz,
actual 135475200HZ div = 0)
cat /sys/kernel/debug/mmc0/ios
clock: 150000000 Hz
actual clock: 135475200 Hz
vdd: 21 (3.3 ~ 3.4 V)
bus mode: 2 (push-pull)
chip select: 0 (don't care)
power mode: 2 (on)
bus width: 3 (8 bits)
timing spec: 9 (mmc HS200)
signal voltage: 0 (1.80 V)
driver type: 0 (driver type B)
Cc: Xiao Yao <xiaoyao@xxxxxxxxxxxxxx>
Cc: Ziyuan <xzy.xu@xxxxxxxxxxxxxx>
Signed-off-by: Shawn Lin <shawn.lin@xxxxxxxxxxxxxx>
---
drivers/mmc/host/dw_mmc.c | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/drivers/mmc/host/dw_mmc.c b/drivers/mmc/host/dw_mmc.c
index 29a1afa..623f4d2 100644
--- a/drivers/mmc/host/dw_mmc.c
+++ b/drivers/mmc/host/dw_mmc.c
@@ -1230,6 +1230,8 @@ static void dw_mci_setup_bus(struct dw_mci_slot *slot, bool force_clkinit)
if (host->state == STATE_WAITING_CMD11_DONE)
sdmmc_cmd_bits |= SDMMC_CMD_VOLT_SWITCH;
+ slot->mmc->actual_clock = 0;
+
if (!clock) {
mci_writel(host, CLKENA, 0);
mci_send_cmd(slot, sdmmc_cmd_bits, 0);
@@ -1288,6 +1290,8 @@ static void dw_mci_setup_bus(struct dw_mci_slot *slot, bool force_clkinit)
/* keep the last clock value that was requested from core */
slot->__clk_old = clock;
+ slot->mmc->actual_clock = div ? ((host->bus_hz / div) >> 1) :
+ host->bus_hz;
}
host->current_speed = clock;
--
1.9.1
--
To unsubscribe from this list: send the line "unsubscribe linux-mmc" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
