On Mon 01 Jul 03:53 PDT 2019, Jorge Ramirez-Ortiz wrote:
> mutexes can sleep and therefore should not be taken while holding a
> spinlock. move clk_get_rate (can sleep) outside the spinlock protected
> region.
>
> This regression was introduced with commit
> Date: Mon Nov 21 12:07:16 2016 +0530
> mmc: sdhci-msm: Update DLL reset sequence
>
> SDCC core with minor version >= 0x42 introduced new 14lpp
> DLL. This has additional requirements in the reset sequence
> for DLL tuning. Make necessary changes as needed.
Your Fixes: below already states this.
>
> Fixes: 83736352e0ca ("mmc: sdhci-msm: Update DLL reset sequence")
> Cc: stable@xxxxxxxxxxxxxxx
> Signed-off-by: Jorge Ramirez-Ortiz <jorge.ramirez-ortiz@xxxxxxxxxx>
Apart from that, your patch is good
Reviewed-by: Bjorn Andersson <bjorn.andersson@xxxxxxxxxx>
Regards,
Bjorn
> ---
> drivers/mmc/host/sdhci-msm.c | 9 ++++++---
> 1 file changed, 6 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/mmc/host/sdhci-msm.c b/drivers/mmc/host/sdhci-msm.c
> index 5fc76a1993d0..9cf14b359c14 100644
> --- a/drivers/mmc/host/sdhci-msm.c
> +++ b/drivers/mmc/host/sdhci-msm.c
> @@ -575,11 +575,14 @@ static int msm_init_cm_dll(struct sdhci_host *host)
> struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
> struct sdhci_msm_host *msm_host = sdhci_pltfm_priv(pltfm_host);
> int wait_cnt = 50;
> - unsigned long flags;
> + unsigned long flags, xo_clk = 0;
> u32 config;
> const struct sdhci_msm_offset *msm_offset =
> msm_host->offset;
>
> + if (msm_host->use_14lpp_dll_reset && !IS_ERR_OR_NULL(msm_host->xo_clk))
> + xo_clk = clk_get_rate(msm_host->xo_clk);
> +
> spin_lock_irqsave(&host->lock, flags);
>
> /*
> @@ -627,10 +630,10 @@ static int msm_init_cm_dll(struct sdhci_host *host)
> config &= CORE_FLL_CYCLE_CNT;
> if (config)
> mclk_freq = DIV_ROUND_CLOSEST_ULL((host->clock * 8),
> - clk_get_rate(msm_host->xo_clk));
> + xo_clk);
> else
> mclk_freq = DIV_ROUND_CLOSEST_ULL((host->clock * 4),
> - clk_get_rate(msm_host->xo_clk));
> + xo_clk);
>
> config = readl_relaxed(host->ioaddr +
> msm_offset->core_dll_config_2);
> --
> 2.21.0
>
