linux-kernel - Re: [PATCH v3 10/10] clk: samsung: exynos5433: Add CLK_IGNORE_UNUSED flag to prevent the hang for suspend-to-ram

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Message-ID: <CAJKOXPfjo_LovrCbBccrPVKSnUBCJNd8+eKQGa40UwDzkL1=zg@mail.gmail.com>
Date:	Mon, 27 Apr 2015 22:49:59 +0900
From:	Krzysztof Kozłowski <k.kozlowski.k@...il.com>
To:	Chanwoo Choi <cw00.choi@...sung.com>
Cc:	s.nawrocki@...sung.com, tomasz.figa@...il.com,
	mturquette@...aro.org, kgene@...nel.org, inki.dae@...sung.com,
	chanho61.park@...sung.com, linux-samsung-soc@...r.kernel.org,
	linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
	Jonghwa Lee <jonghwa3.lee@...sung.com>
Subject: Re: [PATCH v3 10/10] clk: samsung: exynos5433: Add CLK_IGNORE_UNUSED
 flag to prevent the hang for suspend-to-ram

2015-04-27 20:36 GMT+09:00 Chanwoo Choi <cw00.choi@...sung.com>:
> From: Jonghwa Lee <jonghwa3.lee@...sung.com>
>
> Some clocks are required being unmasked for suspend-to-ram. Otherwise,
> PMU (Power Management Unit) will stick and power line never down.

You mean "will stuck and never power down"?

One minor nit below, but overall looks good:
Reviewed-by: Krzysztof Kozlowski <k.kozlowski.k@...il.com>

Best regards,
Krzysztof


>
> Signed-off-by: Jonghwa Lee <jonghwa3.lee@...sung.com>
> Signed-off-by: Chanwoo Choi <cw00.choi@...sung.com>
> ---
>  drivers/clk/samsung/clk-exynos5433.c | 33 +++++++++++++++++++++------------
>  1 file changed, 21 insertions(+), 12 deletions(-)
>
> diff --git a/drivers/clk/samsung/clk-exynos5433.c b/drivers/clk/samsung/clk-exynos5433.c
> index 39c9564..84f02ec 100644
> --- a/drivers/clk/samsung/clk-exynos5433.c
> +++ b/drivers/clk/samsung/clk-exynos5433.c
> @@ -697,11 +697,14 @@ static struct samsung_gate_clock top_gate_clks[] __initdata = {
>         GATE(CLK_SCLK_PCM1_PERIC, "sclk_pcm1_peric", "div_sclk_pcm1",
>                         ENABLE_SCLK_TOP_PERIC, 7, CLK_SET_RATE_PARENT, 0),
>         GATE(CLK_SCLK_UART2_PERIC, "sclk_uart2_peric", "div_sclk_uart2",
> -                       ENABLE_SCLK_TOP_PERIC, 5, CLK_SET_RATE_PARENT, 0),
> +                       ENABLE_SCLK_TOP_PERIC, 5, CLK_SET_RATE_PARENT |
> +                       CLK_IGNORE_UNUSED, 0),
>         GATE(CLK_SCLK_UART1_PERIC, "sclk_uart1_peric", "div_sclk_uart1",
> -                       ENABLE_SCLK_TOP_PERIC, 4, CLK_SET_RATE_PARENT, 0),
> +                       ENABLE_SCLK_TOP_PERIC, 4, CLK_SET_RATE_PARENT |
> +                       CLK_IGNORE_UNUSED, 0),
>         GATE(CLK_SCLK_UART0_PERIC, "sclk_uart0_peric", "div_sclk_uart0",
> -                       ENABLE_SCLK_TOP_PERIC, 3, CLK_SET_RATE_PARENT, 0),
> +                       ENABLE_SCLK_TOP_PERIC, 3, CLK_SET_RATE_PARENT |
> +                       CLK_IGNORE_UNUSED, 0),
>         GATE(CLK_SCLK_SPI2_PERIC, "sclk_spi2_peric", "div_sclk_spi2_b",
>                         ENABLE_SCLK_TOP_PERIC, 2, CLK_SET_RATE_PARENT, 0),
>         GATE(CLK_SCLK_SPI1_PERIC, "sclk_spi1_peric", "div_sclk_spi1_b",
> @@ -862,7 +865,7 @@ static struct samsung_div_clock cpif_div_clks[] __initdata = {
>  static struct samsung_gate_clock cpif_gate_clks[] __initdata = {
>         /* ENABLE_SCLK_CPIF */
>         GATE(CLK_SCLK_MPHY_PLL, "sclk_mphy_pll", "mout_mphy_pll",
> -                       ENABLE_SCLK_CPIF, 9, 0, 0),
> +                       ENABLE_SCLK_CPIF, 9, CLK_IGNORE_UNUSED, 0),
>         GATE(CLK_SCLK_UFS_MPHY, "sclk_ufs_mphy", "div_sclk_mphy",
>                         ENABLE_SCLK_CPIF, 4, 0, 0),
>  };
> @@ -1444,6 +1447,7 @@ static struct samsung_gate_clock mif_gate_clks[] __initdata = {
>         GATE(CLK_PCLK_ASYNCAXI_NOC_P_CCI, "pclk_asyncaxi_noc_p_cci",
>                         "div_aclk_mif_133", ENABLE_PCLK_MIF, 21,
>                         CLK_IGNORE_UNUSED, 0),
> +

This new line seems unrelated.

>         GATE(CLK_PCLK_ASYNCAXI_CP1, "pclk_asyncaxi_cp1", "div_aclk_mif_133",
>                         ENABLE_PCLK_MIF, 19, 0, 0),
>         GATE(CLK_PCLK_ASYNCAXI_CP0, "pclk_asyncaxi_cp0", "div_aclk_mif_133",
--
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