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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Date:	Tue, 28 Apr 2015 18:28:38 +0900
From:	Chanwoo Choi <cwchoi00@...il.com>
To:	Sylwester Nawrocki <s.nawrocki@...sung.com>
Cc:	Tomasz Figa <tomasz.figa@...il.com>,
	Mike Turquette <mturquette@...aro.org>,
	Kukjin Kim <kgene@...nel.org>,
	"inki.dae@...sung.com" <inki.dae@...sung.com>,
	"chanho61.park@...sung.com" <chanho61.park@...sung.com>,
	linux-samsung-soc <linux-samsung-soc@...r.kernel.org>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	devicetree <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

Hi Sylwester,

On Tue, Apr 28, 2015 at 6:15 PM, Sylwester Nawrocki
<s.nawrocki@...sung.com> wrote:
> Hi Chanwoo,
>
> On 27/04/15 13:36, Chanwoo Choi wrote:
>> 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.
>>
>> Signed-off-by: Jonghwa Lee <jonghwa3.lee@...sung.com>
>> Signed-off-by: Chanwoo Choi <cw00.choi@...sung.com>
>> ---
>
>> @@ -1718,11 +1722,14 @@ static struct samsung_gate_clock peric_gate_clks[] __initdata = {
>>       GATE(CLK_SCLK_SPI0, "sclk_spi0", "sclk_spi0_peric", ENABLE_SCLK_PERIC,
>>                       3, CLK_SET_RATE_PARENT, 0),
>>       GATE(CLK_SCLK_UART2, "sclk_uart2", "sclk_uart2_peric",
>> -                     ENABLE_SCLK_PERIC, 2, CLK_SET_RATE_PARENT, 0),
>> +                     ENABLE_SCLK_PERIC, 2,
>> +                     CLK_SET_RATE_PARENT | CLK_IGNORE_UNUSED, 0),
>>       GATE(CLK_SCLK_UART1, "sclk_uart1", "sclk_uart1_peric",
>> -                     ENABLE_SCLK_PERIC, 1, CLK_SET_RATE_PARENT, 0),
>> +                     ENABLE_SCLK_PERIC, 1,
>> +                     CLK_SET_RATE_PARENT | CLK_IGNORE_UNUSED, 0),
>>       GATE(CLK_SCLK_UART0, "sclk_uart0", "sclk_uart0_peric",
>> -                     ENABLE_SCLK_PERIC, 0, CLK_SET_RATE_PARENT, 0),
>> +                     ENABLE_SCLK_PERIC, 0,
>> +                     CLK_SET_RATE_PARENT | CLK_IGNORE_UNUSED, 0),
>>  };
>>
>>  static struct samsung_cmu_info peric_cmu_info __initdata = {
>> @@ -3025,7 +3032,7 @@ static struct samsung_gate_clock aud_gate_clks[] __initdata = {
>>
>>       /* ENABLE_SCLK_AUD0 */
>>       GATE(CLK_ATCLK_AUD, "atclk_aud", "div_atclk_aud", ENABLE_SCLK_AUD0,
>> -                     2, 0, 0),
>> +                     2, CLK_IGNORE_UNUSED, 0),
>>       GATE(CLK_PCLK_DBG_AUD, "pclk_dbg_aud", "div_pclk_dbg_aud",
>>                       ENABLE_SCLK_AUD0, 1, 0, 0),
>>       GATE(CLK_SCLK_AUD_CA5, "sclk_aud_ca5", "div_aud_ca5", ENABLE_SCLK_AUD0,
>> @@ -3425,9 +3432,11 @@ static struct samsung_gate_clock gscl_gate_clks[] __initdata = {
>>       GATE(CLK_ACLK_GSCLNP_111, "aclk_gsclnp_111", "mout_aclk_gscl_111_user",
>>                       ENABLE_ACLK_GSCL, 6, CLK_IGNORE_UNUSED, 0),
>>       GATE(CLK_ACLK_GSCLRTND_333, "aclk_gsclrtnd_333",
>> -                     "mout_aclk_gscl_333_user", ENABLE_ACLK_GSCL, 5, 0, 0),
>> +                     "mout_aclk_gscl_333_user", ENABLE_ACLK_GSCL, 5,
>> +                     CLK_IGNORE_UNUSED, 0),
>>       GATE(CLK_ACLK_GSCLBEND_333, "aclk_gsclbend_333",
>> -                     "mout_aclk_gscl_333_user", ENABLE_ACLK_GSCL, 4, 0, 0),
>> +                     "mout_aclk_gscl_333_user", ENABLE_ACLK_GSCL, 4,
>> +                     CLK_IGNORE_UNUSED, 0),
>
> Some of the clocks you are adding CLK_IGNORE_UNUSED flag for here are
> or will be handled be the related IP drivers, thus can be gated regardless
> of the changes done in this patch. I would suggest to register suspend/
> resume syscore ops like exynos5420_clk_syscore_ops and enable some of
> clocks you're touching in this patch explicitly in the suspend() callback
> and restore the registers state from before suspend() call in resume().

OK, I'll rework and send it.

>
> I've picked up patches 01/10...09/10.

Thanks.

> In future please also copy linux-clk@...r.kernel.org on clk related patches.

OK. I'll send clock patches to linux-clk@...r.kernel.org.

Best Regards,
Chanwoo Choi
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