linux-kernel - [PATCH] clk: ingenic/jz4740: Fix "pll half" divider not read/written properly

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Message-Id: <20190701113606.4130-1-paul@crapouillou.net>
Date:   Mon,  1 Jul 2019 13:36:06 +0200
From:   Paul Cercueil <paul@...pouillou.net>
To:     Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>
Cc:     linux-clk@...r.kernel.org, linux-kernel@...r.kernel.org,
        Paul Cercueil <paul@...pouillou.net>
Subject: [PATCH] clk: ingenic/jz4740: Fix "pll half" divider not read/written properly

The code was setting the bit 21 of the CPCCR register to use a divider
of 2 for the "pll half" clock, and clearing the bit to use a divider
of 1.

This is the opposite of how this register field works: a cleared bit
means that the /2 divider is used, and a set bit means that the divider
is 1.

Restore the correct behaviour using the newly introduced .div_table
field.

Signed-off-by: Paul Cercueil <paul@...pouillou.net>
---
 drivers/clk/ingenic/jz4740-cgu.c | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/drivers/clk/ingenic/jz4740-cgu.c b/drivers/clk/ingenic/jz4740-cgu.c
index a7f8ce60c957..0957ba4a40a5 100644
--- a/drivers/clk/ingenic/jz4740-cgu.c
+++ b/drivers/clk/ingenic/jz4740-cgu.c
@@ -53,6 +53,10 @@ static const u8 jz4740_cgu_cpccr_div_table[] = {
 	1, 2, 3, 4, 6, 8, 12, 16, 24, 32,
 };
 
+static const u8 jz4740_cgu_pll_half_div_table[] = {
+	2, 1,
+};
+
 static const struct ingenic_cgu_clk_info jz4740_cgu_clocks[] = {
 
 	/* External clocks */
@@ -86,7 +90,10 @@ static const struct ingenic_cgu_clk_info jz4740_cgu_clocks[] = {
 	[JZ4740_CLK_PLL_HALF] = {
 		"pll half", CGU_CLK_DIV,
 		.parents = { JZ4740_CLK_PLL, -1, -1, -1 },
-		.div = { CGU_REG_CPCCR, 21, 1, 1, -1, -1, -1 },
+		.div = {
+			CGU_REG_CPCCR, 21, 1, 1, -1, -1, -1,
+			jz4740_cgu_pll_half_div_table,
+		},
 	},
 
 	[JZ4740_CLK_CCLK] = {
-- 
2.21.0.593.g511ec345e18