lkml.org 
[lkml]   [2022]   [Oct]   [19]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
    Patch in this message
    /
    From
    Subject[PATCH 6.0 038/862] mmc: sdhci-tegra: Use actual clock rate for SW tuning correction
    Date
    From: Prathamesh Shete <pshete@nvidia.com>

    commit b78870e7f41534cc719c295d1f8809aca93aeeab upstream.

    Ensure tegra_host member "curr_clk_rate" holds the actual clock rate
    instead of requested clock rate for proper use during tuning correction
    algorithm. Actual clk rate may not be the same as the requested clk
    frequency depending on the parent clock source set. Tuning correction
    algorithm depends on certain parameters which are sensitive to current
    clk rate. If the host clk is selected instead of the actual clock rate,
    tuning correction algorithm may end up applying invalid correction,
    which could result in errors

    Fixes: ea8fc5953e8b ("mmc: tegra: update hw tuning process")
    Signed-off-by: Aniruddha TVS Rao <anrao@nvidia.com>
    Signed-off-by: Prathamesh Shete <pshete@nvidia.com>
    Acked-by: Adrian Hunter <adrian.hunter@intel.com>
    Acked-by: Thierry Reding <treding@nvidia.com>
    Cc: stable@vger.kernel.org
    Link: https://lore.kernel.org/r/20221006130622.22900-4-pshete@nvidia.com
    Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
    Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
    ---
    drivers/mmc/host/sdhci-tegra.c | 2 +-
    1 file changed, 1 insertion(+), 1 deletion(-)

    --- a/drivers/mmc/host/sdhci-tegra.c
    +++ b/drivers/mmc/host/sdhci-tegra.c
    @@ -773,7 +773,7 @@ static void tegra_sdhci_set_clock(struct
    dev_err(dev, "failed to set clk rate to %luHz: %d\n",
    host_clk, err);

    - tegra_host->curr_clk_rate = host_clk;
    + tegra_host->curr_clk_rate = clk_get_rate(pltfm_host->clk);
    if (tegra_host->ddr_signaling)
    host->max_clk = host_clk;
    else

    \
     
     \ /
      Last update: 2022-10-19 10:44    [W:2.292 / U:0.452 seconds]
    ©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site