From df9cd56421635433ee42798fdf09138367039732 Mon Sep 17 00:00:00 2001 From: Linus Walleij Date: Wed, 3 Feb 2016 14:47:08 +0100 Subject: [PATCH] clk: versatile: mask VCO bits before writing The Versatile syscon ICST driver OR:s the bits into place but forgets to mask the previous value, making the code only work if the register is zero or giving haphazard results. Mask the 19 bits used by the Versatile syscon interface register. Regression caused and now fixed by yours truly. Cc: Michael Turquette Cc: Stephen Boyd Cc: linux-clk@vger.kernel.org Fixes: 179c8fb3c2a6 ("clk: versatile-icst: convert to use regmap") Signed-off-by: Linus Walleij Signed-off-by: Stephen Boyd --- drivers/clk/versatile/clk-icst.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/drivers/clk/versatile/clk-icst.c b/drivers/clk/versatile/clk-icst.c index e62f8cb2c9b5..3bca438ecd19 100644 --- a/drivers/clk/versatile/clk-icst.c +++ b/drivers/clk/versatile/clk-icst.c @@ -78,6 +78,9 @@ static int vco_set(struct clk_icst *icst, struct icst_vco vco) ret = regmap_read(icst->map, icst->vcoreg_off, &val); if (ret) return ret; + + /* Mask the 18 bits used by the VCO */ + val &= ~0x7ffff; val |= vco.v | (vco.r << 9) | (vco.s << 16); /* This magic unlocks the VCO so it can be controlled */