On 26 March 2018 at 11:26, Shawn Lin <shawn.lin@xxxxxxxxxxxxxx> wrote:
> 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>
Thanks, queued for 3.18!
Kind regards
Uffe
> ---
>
> 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
>
>
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