linux-kernel - [PATCH 4.8 091/125] clk: core: Force setting the phase delay when no change

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Message-Id: <20161029134950.955101839@linuxfoundation.org>
Date:   Sat, 29 Oct 2016 09:50:09 -0400
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Jean-Francois Moine <moinejf@...e.fr>,
        Stephen Boyd <sboyd@...eaurora.org>
Subject: [PATCH 4.8 091/125] clk: core: Force setting the phase delay when no change

4.8-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Jean-Francois Moine <moinejf@...e.fr>

commit 3174b0c9a62bb3738b4a2a506b8a075d4430e353 upstream.

This patch reverts commit 023bd7166be0 ("clk: skip unnecessary
set_phase if nothing to do"), fixing two problems:

* in some SoCs, the hardware phase delay depends on the rate ratio of
  the clock and its parent. So, changing this ratio may imply to set
  new hardware values, even if the logical delay is the same.

* when the delay was the same as previously, an error was returned.

Signed-off-by: Jean-Francois Moine <moinejf@...e.fr>
Fixes: 023bd7166be0 ("clk: skip unnecessary set_phase if nothing to do")
Signed-off-by: Stephen Boyd <sboyd@...eaurora.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/clk/clk.c |    5 -----
 1 file changed, 5 deletions(-)

--- a/drivers/clk/clk.c
+++ b/drivers/clk/clk.c
@@ -1908,10 +1908,6 @@ int clk_set_phase(struct clk *clk, int d
 
 	clk_prepare_lock();
 
-	/* bail early if nothing to do */
-	if (degrees == clk->core->phase)
-		goto out;
-
 	trace_clk_set_phase(clk->core, degrees);
 
 	if (clk->core->ops->set_phase)
@@ -1922,7 +1918,6 @@ int clk_set_phase(struct clk *clk, int d
 	if (!ret)
 		clk->core->phase = degrees;
 
-out:
 	clk_prepare_unlock();
 
 	return ret;