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| author | Faiz Abbas <faiz_abbas@ti.com> | 2019-10-10 16:22:30 +0530 |
|---|---|---|
| committer | Ulf Hansson <ulf.hansson@linaro.org> | 2019-10-21 13:37:49 +0200 |
| commit | feb40824d78eac5e48f56498dca941754dff33d7 (patch) | |
| tree | 154b6bb82643871e8b198b1d573a32e75a763dc8 /drivers/mmc | |
| parent | 7d194c2100ad2a6dded545887d02754948ca5241 (diff) | |
| download | linux-riscv-feb40824d78eac5e48f56498dca941754dff33d7.tar.gz linux-riscv-feb40824d78eac5e48f56498dca941754dff33d7.tar.bz2 linux-riscv-feb40824d78eac5e48f56498dca941754dff33d7.zip | |
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 <faiz_abbas@ti.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Diffstat (limited to 'drivers/mmc')
| -rw-r--r-- | drivers/mmc/host/sdhci-omap.c | 2 |
1 files changed, 1 insertions, 1 deletions
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) |