linux-kernel - [PATCH 4.17 235/336] mmc: dw_mmc: update actual clock for mmc debugfs

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Date:   Wed,  1 Aug 2018 18:49:30 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Xiao Yao <xiaoyao@...k-chips.com>,
        Ziyuan <xzy.xu@...k-chips.com>,
        Shawn Lin <shawn.lin@...k-chips.com>,
        Ulf Hansson <ulf.hansson@...aro.org>,
        Sasha Levin <alexander.levin@...rosoft.com>
Subject: [PATCH 4.17 235/336] mmc: dw_mmc: update actual clock for mmc debugfs

4.17-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Shawn Lin <shawn.lin@...k-chips.com>

[ 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@...k-chips.com>
Cc: Ziyuan <xzy.xu@...k-chips.com>
Signed-off-by: Shawn Lin <shawn.lin@...k-chips.com>
Signed-off-by: Ulf Hansson <ulf.hansson@...aro.org>
Signed-off-by: Sasha Levin <alexander.levin@...rosoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/mmc/host/dw_mmc.c |    4 ++++
 1 file changed, 4 insertions(+)

--- a/drivers/mmc/host/dw_mmc.c
+++ b/drivers/mmc/host/dw_mmc.c
@@ -1231,6 +1231,8 @@ static void dw_mci_setup_bus(struct dw_m
 	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);
@@ -1289,6 +1291,8 @@ static void dw_mci_setup_bus(struct dw_m
 
 		/* 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;