Commit ff178981 authored Mar 26, 2018 by Shawn Lin Committed by Ulf Hansson May 02, 2018

mmc: dw_mmc: update actual clock for mmc debugfs



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>

parent 486e6661

drivers/mmc/host/dw_mmc.c

+4 −0

Original line number	Diff line number	Diff line
		@@ -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;

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