4.9-stable review patch. If anyone has any objections, please let me know.
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From: Chen-Yu Tsai wens@csie.org
commit 61d2f2a05765a5f57149efbd93e3e81a83cbc2c1 upstream.
Our MMC host driver now issues a reset, instead of just deasserting the reset control, since commit c34eda69ad4c ("mmc: sunxi: Reset the device at probe time"). The sun9i-mmc clock driver does not support this, and will fail, which results in MMC not probing.
This patch implements the reset callback by asserting the reset control, then deasserting it after a small delay.
Fixes: 7a6fca879f59 ("clk: sunxi: Add driver for A80 MMC config clocks/resets") Signed-off-by: Chen-Yu Tsai wens@csie.org Acked-by: Philipp Zabel p.zabel@pengutronix.de Acked-by: Maxime Ripard maxime.ripard@free-electrons.com Signed-off-by: Michael Turquette mturquette@baylibre.com Link: lkml.kernel.org/r/20171218035751.20661-1-wens@csie.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- drivers/clk/sunxi/clk-sun9i-mmc.c | 12 ++++++++++++ 1 file changed, 12 insertions(+)
--- a/drivers/clk/sunxi/clk-sun9i-mmc.c +++ b/drivers/clk/sunxi/clk-sun9i-mmc.c @@ -16,6 +16,7 @@
#include <linux/clk.h> #include <linux/clk-provider.h> +#include <linux/delay.h> #include <linux/init.h> #include <linux/of.h> #include <linux/of_device.h> @@ -83,9 +84,20 @@ static int sun9i_mmc_reset_deassert(stru return 0; }
+static int sun9i_mmc_reset_reset(struct reset_controller_dev *rcdev, + unsigned long id) +{ + sun9i_mmc_reset_assert(rcdev, id); + udelay(10); + sun9i_mmc_reset_deassert(rcdev, id); + + return 0; +} + static const struct reset_control_ops sun9i_mmc_reset_ops = { .assert = sun9i_mmc_reset_assert, .deassert = sun9i_mmc_reset_deassert, + .reset = sun9i_mmc_reset_reset, };
static int sun9i_a80_mmc_config_clk_probe(struct platform_device *pdev)