From: Faiz Abbas Date: Thu, 10 Oct 2019 10:52:30 +0000 (+0530) Subject: mmc: sdhci-omap: Fix Tuning procedure for temperatures < -20C X-Git-Tag: v5.15~5258^2~2 X-Git-Url: https://git.proxmox.com/?a=commitdiff_plain;h=feb40824d78eac5e48f56498dca941754dff33d7;p=mirror_ubuntu-kernels.git mmc: sdhci-omap: Fix Tuning procedure for temperatures < -20C According to the App note[1] detailing the tuning algorithm, for temperatures < -20C, the initial tuning value should be min(largest value in LPW - 24, ceil(13/16 ratio of LPW)). The largest value in LPW is (max_window + 4 * (max_len - 1)) and not (max_window + 4 * max_len) itself. Fix this implementation. [1] http://www.ti.com/lit/an/spraca9b/spraca9b.pdf Fixes: 961de0a856e3 ("mmc: sdhci-omap: Workaround errata regarding SDR104/HS200 tuning failures (i929)") Cc: stable@vger.kernel.org Signed-off-by: Faiz Abbas Signed-off-by: Ulf Hansson --- diff --git a/drivers/mmc/host/sdhci-omap.c b/drivers/mmc/host/sdhci-omap.c index 41c2677c587f..083e7e053c95 100644 --- a/drivers/mmc/host/sdhci-omap.c +++ b/drivers/mmc/host/sdhci-omap.c @@ -372,7 +372,7 @@ static int sdhci_omap_execute_tuning(struct mmc_host *mmc, u32 opcode) * on temperature */ if (temperature < -20000) - phase_delay = min(max_window + 4 * max_len - 24, + phase_delay = min(max_window + 4 * (max_len - 1) - 24, max_window + DIV_ROUND_UP(13 * max_len, 16) * 4); else if (temperature < 20000)