From 7dc3354ac8fa4312b2c309037ec1f138212c393a Mon Sep 17 00:00:00 2001 From: Sascha Hauer Date: Tue, 13 Sep 2016 15:41:05 +0200 Subject: [PATCH] ARM: i.MX6: Enable parent propagation for clk_gate2 Enable parent rate propagation for clk_gate2 to allow the clock consumers to adjust their rates. One effect of this is that the i.MX6 NAND controller now can adjust its rate. It already called a clk_set_rate(rate, 96000000), but this had no effect, so the clock stayed at reset default 24MHz resulting in a rather slow timing. This became a problem when commit "1daa3bc mtd: nand_mxs: Setup timing" introduced EDO timing mode for faster NAND chips. EDO mode can only work properly for cycle times < 30ns (at least that's specified in the ONFI spec). 1daa3bc resulted in sporadic NAND read errors on some boards. Signed-off-by: Sascha Hauer Tested-by: Sam Ravnborg --- arch/arm/mach-imx/clk-gate2.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/arch/arm/mach-imx/clk-gate2.c b/arch/arm/mach-imx/clk-gate2.c index 344c2fb1e..faed6313f 100644 --- a/arch/arm/mach-imx/clk-gate2.c +++ b/arch/arm/mach-imx/clk-gate2.c @@ -79,6 +79,8 @@ static int clk_gate2_is_enabled(struct clk *clk) } static struct clk_ops clk_gate2_ops = { + .set_rate = clk_parent_set_rate, + .round_rate = clk_parent_round_rate, .enable = clk_gate2_enable, .disable = clk_gate2_disable, .is_enabled = clk_gate2_is_enabled, @@ -96,6 +98,7 @@ struct clk *clk_gate2_alloc(const char *name, const char *parent, g->clk.name = name; g->clk.parent_names = &g->parent; g->clk.num_parents = 1; + g->clk.flags = CLK_SET_RATE_PARENT; return &g->clk; }