4.2-stable review patch. If anyone has any objections, please let me know.
------------------ From: Yangbo Lu <[email protected]> commit 77bd2f6f6c65b4ad259394d416855ed561f21e8f upstream. For eSDHC(version < 2.3), the pre divider only could divide base clock by 2 at least. Add workaround for this to avoid unexpected issue. Signed-off-by: Yangbo Lu <[email protected]> Acked-by: Joakim Tjernlund <[email protected]> Fixes: bd455029d01c ("mmc: sdhci-of-esdhc: Pre divider starts at 1") Signed-off-by: Ulf Hansson <[email protected]> Signed-off-by: Greg Kroah-Hartman <[email protected]> --- drivers/mmc/host/sdhci-of-esdhc.c | 6 ++++++ 1 file changed, 6 insertions(+) --- a/drivers/mmc/host/sdhci-of-esdhc.c +++ b/drivers/mmc/host/sdhci-of-esdhc.c @@ -208,6 +208,12 @@ static void esdhc_of_set_clock(struct sd if (clock == 0) return; + /* Workaround to start pre_div at 2 for VNN < VENDOR_V_23 */ + temp = esdhc_readw(host, SDHCI_HOST_VERSION); + temp = (temp & SDHCI_VENDOR_VER_MASK) >> SDHCI_VENDOR_VER_SHIFT; + if (temp < VENDOR_V_23) + pre_div = 2; + /* Workaround to reduce the clock frequency for p1010 esdhc */ if (of_find_compatible_node(NULL, NULL, "fsl,p1010-esdhc")) { if (clock > 20000000) -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
