| From | Greg Kroah-Hartman <> | Subject | [PATCH 5.3 143/197] mmc: sdhci-omap: Fix Tuning procedure for temperatures < -20C | Date | Sun, 27 Oct 2019 22:01:01 +0100 |
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From: Faiz Abbas <faiz_abbas@ti.com>
commit feb40824d78eac5e48f56498dca941754dff33d7 upstream.
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 <faiz_abbas@ti.com> Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
--- drivers/mmc/host/sdhci-omap.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
--- a/drivers/mmc/host/sdhci-omap.c +++ b/drivers/mmc/host/sdhci-omap.c @@ -372,7 +372,7 @@ static int sdhci_omap_execute_tuning(str * 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)
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