linux-kernel - [PATCH AUTOSEL 4.19 13/56] clk: sunxi-ng: h6-r: Fix AR100/R

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Message-Id: <20200124142012.29752-13-sashal@kernel.org>
Date:   Fri, 24 Jan 2020 09:19:29 -0500
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Samuel Holland <samuel@...lland.org>,
        Maxime Ripard <maxime@...no.tech>,
        Sasha Levin <sashal@...nel.org>, linux-clk@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org
Subject: [PATCH AUTOSEL 4.19 13/56] clk: sunxi-ng: h6-r: Fix AR100/R_APB2 parent order

From: Samuel Holland <samuel@...lland.org>

[ Upstream commit 0c545240aebc2ccb8f661dc54283a14d64659804 ]

According to the BSP source code, both the AR100 and R_APB2 clocks have
PLL_PERIPH0 as mux index 3, not 2 as it was on previous chips. The pre-
divider used for PLL_PERIPH0 should be changed to index 3 to match.

This was verified by running a rough benchmark on the AR100 with various
clock settings:

        | mux | pre-divider | iterations/second | clock source |
        |=====|=============|===================|==============|
        |   0 |           0 |  19033   (stable) |       osc24M |
        |   2 |           5 |  11466 (unstable) |  iosc/osc16M |
        |   2 |          17 |  11422 (unstable) |  iosc/osc16M |
        |   3 |           5 |  85338   (stable) |  pll-periph0 |
        |   3 |          17 |  27167   (stable) |  pll-periph0 |

The relative performance numbers all match up (with pll-periph0 running
at its default 600MHz).

Signed-off-by: Samuel Holland <samuel@...lland.org>
Signed-off-by: Maxime Ripard <maxime@...no.tech>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/clk/sunxi-ng/ccu-sun50i-h6-r.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/clk/sunxi-ng/ccu-sun50i-h6-r.c b/drivers/clk/sunxi-ng/ccu-sun50i-h6-r.c
index 27554eaf69298..3f78035ff85af 100644
--- a/drivers/clk/sunxi-ng/ccu-sun50i-h6-r.c
+++ b/drivers/clk/sunxi-ng/ccu-sun50i-h6-r.c
@@ -23,9 +23,9 @@
  */
 
 static const char * const ar100_r_apb2_parents[] = { "osc24M", "osc32k",
-					     "pll-periph0", "iosc" };
+						     "iosc", "pll-periph0" };
 static const struct ccu_mux_var_prediv ar100_r_apb2_predivs[] = {
-	{ .index = 2, .shift = 0, .width = 5 },
+	{ .index = 3, .shift = 0, .width = 5 },
 };
 
 static struct ccu_div ar100_clk = {
-- 
2.20.1