This is a note to let you know that I've just added the patch titled
clk: sunxi: sun9i-mmc: Implement reset callback for reset controls
to the 4.14-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git%3Ba=su...
The filename of the patch is: clk-sunxi-sun9i-mmc-implement-reset-callback-for-reset-controls.patch and it can be found in the queue-4.14 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree, please let stable@vger.kernel.org know about it.
From 61d2f2a05765a5f57149efbd93e3e81a83cbc2c1 Mon Sep 17 00:00:00 2001
From: Chen-Yu Tsai wens@csie.org Date: Mon, 18 Dec 2017 11:57:51 +0800 Subject: clk: sunxi: sun9i-mmc: Implement reset callback for reset controls
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)
Patches currently in stable-queue which might be from wens@csie.org are
queue-4.14/drm-sun4i-fix-error-path-handling.patch queue-4.14/clk-sunxi-sun9i-mmc-implement-reset-callback-for-reset-controls.patch