linux-kernel - Re: [PATCH] clk: rockchip: Reparent hclk_rom, hclk_i2s0 and hclk_spdif to hclk

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Message-ID: <18195479.b78tX8z5U3@diego>
Date:	Tue, 26 Jan 2016 14:04:58 +0100
From:	Heiko Stübner <heiko@...ech.de>
To:	Alexander Kochetkov <al.kochet@...il.com>
Cc:	stable@...r.kernel.org, linux-clk@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	linux-rockchip@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] clk: rockchip: Reparent hclk_rom, hclk_i2s0 and hclk_spdif to hclk_cpubus on RK3066/RK3188

Hi Alexander,

Am Dienstag, 26. Januar 2016, 15:44:10 schrieb Alexander Kochetkov:
> In order to make peripherals (rom, i2s0 or spdif) accessible via cpu,
> hclk_cpubus gate must be opened. Without that all accesses (readl/writel)
> return wrong data.

The clock hierarchy does reflect the hardware structure. What you're 
introducing are software constraints. Meaning hclk_cpubus is most likely part 
of the interconnect allowing these peripherals to talk to other parts of the 
system, but the relevant clocks are _not_ children of hclk_cpubus.

Can you instead try to add hclk_cpubus to the critical clock list please?


Thanks
Heiko


> 
> The patch fixes regression introduced by recent clock code.
> 
> Fixes: 78eaf6095cc763c ("clk: rockchip: disable unused clocks")
> 
> Signed-off-by: Alexander Kochetkov <al.kochet@...il.com>
> 
> CC: linux-clk@...r.kernel.org
> CC: linux-arm-kernel@...ts.infradead.org
> CC: linux-rockchip@...ts.infradead.org
> CC: linux-kernel@...r.kernel.org
> CC: stable@...r.kernel.org # 4.1.x-
> ---
>  drivers/clk/rockchip/clk-rk3188.c |    6 +++---
>  1 file changed, 3 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/clk/rockchip/clk-rk3188.c
> b/drivers/clk/rockchip/clk-rk3188.c index abb4760..54b88a6 100644
> --- a/drivers/clk/rockchip/clk-rk3188.c
> +++ b/drivers/clk/rockchip/clk-rk3188.c
> @@ -429,10 +429,10 @@ static struct rockchip_clk_branch
> common_clk_branches[] __initdata = { GATE(0, "aclk_strc_sys", "aclk_cpu",
> CLK_IGNORE_UNUSED, RK2928_CLKGATE_CON(4), 10, GFLAGS),
> 
>  	/* hclk_cpu gates */
> -	GATE(HCLK_ROM, "hclk_rom", "hclk_cpu", 0, RK2928_CLKGATE_CON(5), 6,
> GFLAGS), -	GATE(HCLK_I2S0, "hclk_i2s0", "hclk_cpu", 0,
> RK2928_CLKGATE_CON(7), 2, GFLAGS), -	GATE(HCLK_SPDIF, "hclk_spdif",
> "hclk_cpu", 0, RK2928_CLKGATE_CON(7), 1, GFLAGS), GATE(0, "hclk_cpubus",
> "hclk_cpu", 0, RK2928_CLKGATE_CON(4), 8, GFLAGS), +	GATE(HCLK_ROM,
> "hclk_rom", "hclk_cpubus", 0, RK2928_CLKGATE_CON(5), 6, GFLAGS),
> +	GATE(HCLK_I2S0, "hclk_i2s0", "hclk_cpubus", 0, RK2928_CLKGATE_CON(7), 2,
> GFLAGS), +	GATE(HCLK_SPDIF, "hclk_spdif", "hclk_cpubus", 0,
> RK2928_CLKGATE_CON(7), 1, GFLAGS), /* hclk_ahb2apb is part of a clk branch
> */
>  	GATE(0, "hclk_vio_bus", "hclk_cpu", 0, RK2928_CLKGATE_CON(6), 12, GFLAGS),
> GATE(HCLK_LCDC0, "hclk_lcdc0", "hclk_cpu", 0, RK2928_CLKGATE_CON(6), 1,
> GFLAGS),