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authorChen-Yu Tsai <wens@csie.org>2019-02-05 23:42:24 +0800
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2019-02-20 10:29:11 +0100
commitcb384113e6146db1c951abeb75852b77972c570f (patch)
treed639abdfaf264a532d5e5d59bc79fd84e9ee8236
parentb60a14889ba2bc4a4c20fde1b6bb436c61cdd485 (diff)
mmc: sunxi: Filter out unsupported modes declared in the device tree
commit d6f11e7d91f2ac85f66194fe3ef8789b49901d64 upstream. The MMC device tree bindings include properties used to signal various signalling speed modes. Until now the sunxi driver was accepting them without any further filtering, while the sunxi device trees were not actually using them. Since some of the H5 boards can not run at higher speed modes stably, we are resorting to declaring the higher speed modes per-board. Regardless, having boards declare modes and blindly following them, even without proper support in the driver, is generally a bad thing. Filter out all unsupported modes from the capabilities mask after the device tree properties have been parsed. Cc: <stable@vger.kernel.org> Signed-off-by: Chen-Yu Tsai <wens@csie.org> Acked-by: Maxime Ripard <maxime.ripard@bootlin.com> Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
-rw-r--r--drivers/mmc/host/sunxi-mmc.c15
1 files changed, 15 insertions, 0 deletions
diff --git a/drivers/mmc/host/sunxi-mmc.c b/drivers/mmc/host/sunxi-mmc.c
index 7415af8c8ff6..70fadc976795 100644
--- a/drivers/mmc/host/sunxi-mmc.c
+++ b/drivers/mmc/host/sunxi-mmc.c
@@ -1415,6 +1415,21 @@ static int sunxi_mmc_probe(struct platform_device *pdev)
if (ret)
goto error_free_dma;
+ /*
+ * If we don't support delay chains in the SoC, we can't use any
+ * of the higher speed modes. Mask them out in case the device
+ * tree specifies the properties for them, which gets added to
+ * the caps by mmc_of_parse() above.
+ */
+ if (!(host->cfg->clk_delays || host->use_new_timings)) {
+ mmc->caps &= ~(MMC_CAP_3_3V_DDR | MMC_CAP_1_8V_DDR |
+ MMC_CAP_1_2V_DDR | MMC_CAP_UHS);
+ mmc->caps2 &= ~MMC_CAP2_HS200;
+ }
+
+ /* TODO: This driver doesn't support HS400 mode yet */
+ mmc->caps2 &= ~MMC_CAP2_HS400;
+
ret = sunxi_mmc_init_host(host);
if (ret)
goto error_free_dma;