From ff178981bd5fd1667f373098740cb1c6d6efa1ba Mon Sep 17 00:00:00 2001
From: Shawn Lin <shawn.lin@rock-chips.com>
Date: Mon, 26 Mar 2018 17:26:25 +0800
Subject: [PATCH] mmc: dw_mmc: update actual clock for mmc debugfs
Git-commit: ff178981bd5fd1667f373098740cb1c6d6efa1ba
Patch-mainline: v4.18-rc1
References: bsc#1051510
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>
Acked-by: Takashi Iwai <tiwai@suse.de>
---
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 29a1afa81f66..623f4d27fa01 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;
--
2.18.0