FAILED: patch "[PATCH] clk: update cached phase to respect the fact when setting" failed to apply to 4.15-stable tree

[<gregkh@linuxfoundation.org>]

The patch below does not apply to the 4.15-stable tree.
If someone wants it applied there, or to any other stable or longterm
tree, then please email the backport, including the original git commit
id to <stable@vger.kernel.org>.

thanks,

greg k-h

------------------ original commit in Linus's tree ------------------

>From 7f95beea36089918335eb1810ddd7ba8cf9d09cc Mon Sep 17 00:00:00 2001
From: Shawn Lin <shawn.lin@rock-chips.com>
Date: Thu, 8 Mar 2018 14:49:41 +0800
Subject: [PATCH] clk: update cached phase to respect the fact when setting
 phase

It's found that the final phase set by driver doesn't match that of
the output from clk_summary:

dwmmc_rockchip fe310000.dwmmc: Successfully tuned phase to 346
mmc0: new ultra high speed SDR104 SDIO card at address 0001

cat /sys/kernel/debug/clk/clk_summary | grep sdio_sample
sdio_sample	0        1        0    50000000 0 0

It seems the cached core->phase isn't updated after the clk was
registered. So fix this issue by updating the core->phase if setting
phase successfully.

Fixes: 9e4d04adeb1a ("clk: add clk_core_set_phase_nolock function")
Cc: Stable <stable@vger.kernel.org>
Cc: Jerome Brunet <jbrunet@baylibre.com>
Signed-off-by: Shawn Lin <shawn.lin@rock-chips.com>
Reviewed-by: Jerome Brunet <jbrunet@baylibre.com>
Tested-by: Jerome Brunet <jbrunet@baylibre.com>
Signed-off-by: Michael Turquette <mturquette@baylibre.com>

diff --git a/drivers/clk/clk.c b/drivers/clk/clk.c
index 0f686a9dac3e..617e56268b18 100644
--- a/drivers/clk/clk.c
+++ b/drivers/clk/clk.c
@@ -2309,8 +2309,11 @@ static int clk_core_set_phase_nolock(struct clk_core *core, int degrees)
 
 	trace_clk_set_phase(core, degrees);
 
-	if (core->ops->set_phase)
+	if (core->ops->set_phase) {
 		ret = core->ops->set_phase(core->hw, degrees);
+		if (!ret)
+			core->phase = degrees;
+	}
 
 	trace_clk_set_phase_complete(core, degrees);