mmc: dw_mmc: update actual clock for mmc debugfs

[ Upstream commit ff178981bd5fd1667f373098740cb1c6d6efa1ba ]

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@rock-chips.com>
Cc: Ziyuan <xzy.xu@rock-chips.com>
Signed-off-by: Shawn Lin <shawn.lin@rock-chips.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/mmc/host/dw_mmc.c b/drivers/mmc/host/dw_mmc.c
index 6a2cbbb..5252885 100644 (file)
--- a/drivers/mmc/host/dw_mmc.c
+++ b/drivers/mmc/host/dw_mmc.c
@@ -1255,6 +1255,8 @@ 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);
@@ -1313,6 +1315,8 @@ 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;