Re: [PATCH v2 7/7] cpufreq: exynos: remove all exynos specific cpufreq driver support

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Hi Lukasz,

On Wed, Feb 5, 2014 at 5:14 PM, Lukasz Majewski <l.majewski@xxxxxxxxxxx> wrote:
> Hi Thomas,
>
> Fist of all, thanks for your patches.
>
>> Hi Lukasz,
>>
>> On Mon, Jan 20, 2014 at 1:38 PM, Lukasz Majewski
>> <l.majewski@xxxxxxxxxxx> wrote:
>> > Hi Thomas,
>> >
>> >> From: Thomas Abraham <thomas.ab@xxxxxxxxxxx>
>> >>
>> >> Exynos4210, Exynos4x12 and Exynos5250 based platforms have switched
>> >> over to use cpufreq-cpu0 driver for cpufreq functionality. So the
>> >> Exynos specific cpufreq drivers for these platforms can be removed.
>> >>
>>
>> <snip>
>>
>> >> -static unsigned int exynos4x12_volt_table[] = {
>> >> -     1350000, 1287500, 1250000, 1187500, 1137500, 1087500,
>> >> 1037500,
>> >> -     1000000,  987500,  975000,  950000,  925000,  900000,  900000
>> >> -};
>> >> -
>> >> -static struct cpufreq_frequency_table exynos4x12_freq_table[] = {
>> >> -     {CPUFREQ_BOOST_FREQ, 1500 * 1000},
>> >
>> > Here, you are removing BOOST support for Exynos4412, without any
>> > code, which brings back this functionality in the new code.
>> >
>> > I'd propose adding new property to cpus node and during
>> > operating-points parsing mark the entry at the
>> > cpufreq_frequency_table accordingly.
>>
>> I tried doing this as you suggested with [1] but looks like that will
>> not go through at this point.
>
> I've read your patches regarding OPP. In my opinion, despite the problem
> with further OPP format discussion (which is ongoing and probably will
> take some time), there is a palatable solution (presented below).
>
>> The other alternative would be to use
>> exynos specific cpufreq drivers only if multiplatform config is not
>> selected or use cpufreq-cpu0 if multiplatform config is selected (but
>> this is not something I would want to do). With this, there are issues
>> like clock blocks encapsulated within the opaque clock type cannot be
>> removed since exynos specific cpufreq drivers need it and hence it is
>> not really a clean solution.
>
> It would be a maintenance nightmare. We cannot afford to do such huge
> cleanup only partially. The rationale for the whole clean up is to
> remove exynosXXXX-cpufreq.c files.
>
> I also share your doubts here. We shall NOT do it this way.
>
>>The other option is to drop the support
>> for boost on exynos4x12 for now and reintroduce that when the OPP
>> bindings have been finalized.
>
> So you want to drop the BOOST kernel functionality just because you are
> doing clean up and this feature is problematic to provide at new
> approach?
>
>> Would that be okay?
>
> It is NOT acceptable. Sorry, but NAK.
>
>> Any other
>> suggestions will also be helpful.
>
> For me it would be perfectly fine to see at device tree CPU0 node code
> proposed by Nishanth:
>
> operating-points = < Fa Va
>         Fb Vb
>         Fc Vc
>         Fd Vd
>         >;
> boost-frequencies = <Fc Fd>;
>
> And then the cpufreq table could be properly modified by marking
> relevant frequencies as CPUFREQ_BOOST_FREQ.

Okay, thanks. Initially it looked like adding boost frequencies into
operating-modes would convolute it but I guess I was wrong. So I will
add support for looking up "boost-frequencies" property in
dev_pm_opp_init_cpufreq_table function and mark the frequencies listed
in this binding as CPUFREQ_BOOST_FREQ.

Thanks,
Thomas.

>
>>
>> Thanks,
>> Thomas.
>>
>> >
>> >> -     {L1, 1400 * 1000},
>> >> -     {L2, 1300 * 1000},
>> >> -     {L3, 1200 * 1000},
>> >> -     {L4, 1100 * 1000},
>> >> -     {L5, 1000 * 1000},
>> >> -     {L6,  900 * 1000},
>> >> -     {L7,  800 * 1000},
>> >> -     {L8,  700 * 1000},
>> >> -     {L9,  600 * 1000},
>> >> -     {L10, 500 * 1000},
>> >> -     {L11, 400 * 1000},
>> >> -     {L12, 300 * 1000},
>> >> -     {L13, 200 * 1000},
>> >> -     {0, CPUFREQ_TABLE_END},
>> >> -};
>> >> -
>> >> -static struct apll_freq *apll_freq_4x12;
>> >> -
>> >> -static struct apll_freq apll_freq_4212[] = {
>> >> -     /*
>> >> -      * values:
>> >> -      * freq
>> >> -      * clock divider for CORE, COREM0, COREM1, PERIPH, ATB,
>> >> PCLK_DBG, APLL, CORE2
>> >> -      * clock divider for COPY, HPM, RESERVED
>> >> -      * PLL M, P, S
>> >> -      */
>> >> -     APLL_FREQ(1500, 0, 3, 7, 0, 6, 1, 2, 0, 6, 2, 0, 250, 4, 0),
>> >> -     APLL_FREQ(1400, 0, 3, 7, 0, 6, 1, 2, 0, 6, 2, 0, 175, 3, 0),
>> >> -     APLL_FREQ(1300, 0, 3, 7, 0, 5, 1, 2, 0, 5, 2, 0, 325, 6, 0),
>> >> -     APLL_FREQ(1200, 0, 3, 7, 0, 5, 1, 2, 0, 5, 2, 0, 200, 4, 0),
>> >> -     APLL_FREQ(1100, 0, 3, 6, 0, 4, 1, 2, 0, 4, 2, 0, 275, 6, 0),
>> >> -     APLL_FREQ(1000, 0, 2, 5, 0, 4, 1, 1, 0, 4, 2, 0, 125, 3, 0),
>> >> -     APLL_FREQ(900,  0, 2, 5, 0, 3, 1, 1, 0, 3, 2, 0, 150, 4, 0),
>> >> -     APLL_FREQ(800,  0, 2, 5, 0, 3, 1, 1, 0, 3, 2, 0, 100, 3, 0),
>> >> -     APLL_FREQ(700,  0, 2, 4, 0, 3, 1, 1, 0, 3, 2, 0, 175, 3, 1),
>> >> -     APLL_FREQ(600,  0, 2, 4, 0, 3, 1, 1, 0, 3, 2, 0, 200, 4, 1),
>> >> -     APLL_FREQ(500,  0, 2, 4, 0, 3, 1, 1, 0, 3, 2, 0, 125, 3, 1),
>> >> -     APLL_FREQ(400,  0, 2, 4, 0, 3, 1, 1, 0, 3, 2, 0, 100, 3, 1),
>> >> -     APLL_FREQ(300,  0, 2, 4, 0, 2, 1, 1, 0, 3, 2, 0, 200, 4, 2),
>> >> -     APLL_FREQ(200,  0, 1, 3, 0, 1, 1, 1, 0, 3, 2, 0, 100, 3, 2),
>> >> -};
>> >> -
>> >> -static struct apll_freq apll_freq_4412[] = {
>> >> -     /*
>> >> -      * values:
>> >> -      * freq
>> >> -      * clock divider for CORE, COREM0, COREM1, PERIPH, ATB,
>> >> PCLK_DBG, APLL, CORE2
>> >> -      * clock divider for COPY, HPM, CORES
>> >> -      * PLL M, P, S
>> >> -      */
>> >> -     APLL_FREQ(1500, 0, 3, 7, 0, 6, 1, 2, 0, 6, 0, 7, 250, 4, 0),
>> >> -     APLL_FREQ(1400, 0, 3, 7, 0, 6, 1, 2, 0, 6, 0, 6, 175, 3, 0),
>> >> -     APLL_FREQ(1300, 0, 3, 7, 0, 5, 1, 2, 0, 5, 0, 6, 325, 6, 0),
>> >> -     APLL_FREQ(1200, 0, 3, 7, 0, 5, 1, 2, 0, 5, 0, 5, 200, 4, 0),
>> >> -     APLL_FREQ(1100, 0, 3, 6, 0, 4, 1, 2, 0, 4, 0, 5, 275, 6, 0),
>> >> -     APLL_FREQ(1000, 0, 2, 5, 0, 4, 1, 1, 0, 4, 0, 4, 125, 3, 0),
>> >> -     APLL_FREQ(900,  0, 2, 5, 0, 3, 1, 1, 0, 3, 0, 4, 150, 4, 0),
>> >> -     APLL_FREQ(800,  0, 2, 5, 0, 3, 1, 1, 0, 3, 0, 3, 100, 3, 0),
>> >> -     APLL_FREQ(700,  0, 2, 4, 0, 3, 1, 1, 0, 3, 0, 3, 175, 3, 1),
>> >> -     APLL_FREQ(600,  0, 2, 4, 0, 3, 1, 1, 0, 3, 0, 2, 200, 4, 1),
>> >> -     APLL_FREQ(500,  0, 2, 4, 0, 3, 1, 1, 0, 3, 0, 2, 125, 3, 1),
>> >> -     APLL_FREQ(400,  0, 2, 4, 0, 3, 1, 1, 0, 3, 0, 1, 100, 3, 1),
>> >> -     APLL_FREQ(300,  0, 2, 4, 0, 2, 1, 1, 0, 3, 0, 1, 200, 4, 2),
>> >> -     APLL_FREQ(200,  0, 1, 3, 0, 1, 1, 1, 0, 3, 0, 0, 100, 3, 2),
>> >> -};
>> >> -
>> >> -static void exynos4x12_set_clkdiv(unsigned int div_index)
>> >> -{
>> >> -     unsigned int tmp;
>> >> -     unsigned int stat_cpu1;
>> >> -
>> >> -     /* Change Divider - CPU0 */
>> >> -
>> >> -     tmp = apll_freq_4x12[div_index].clk_div_cpu0;
>> >> -
>> >> -     __raw_writel(tmp, EXYNOS4_CLKDIV_CPU);
>> >> -
>> >> -     while (__raw_readl(EXYNOS4_CLKDIV_STATCPU) & 0x11111111)
>> >> -             cpu_relax();
>> >> -
>> >> -     /* Change Divider - CPU1 */
>> >> -     tmp = apll_freq_4x12[div_index].clk_div_cpu1;
>> >> -
>> >> -     __raw_writel(tmp, EXYNOS4_CLKDIV_CPU1);
>> >> -     if (soc_is_exynos4212())
>> >> -             stat_cpu1 = 0x11;
>> >> -     else
>> >> -             stat_cpu1 = 0x111;
>> >> -
>> >> -     while (__raw_readl(EXYNOS4_CLKDIV_STATCPU1) & stat_cpu1)
>> >> -             cpu_relax();
>> >> -}
>> >> -
>> >> -static void exynos4x12_set_apll(unsigned int index)
>> >> -{
>> >> -     unsigned int tmp, freq = apll_freq_4x12[index].freq;
>> >> -
>> >> -     /* MUX_CORE_SEL = MPLL, ARMCLK uses MPLL for lock time */
>> >> -     clk_set_parent(moutcore, mout_mpll);
>> >> -
>> >> -     do {
>> >> -             cpu_relax();
>> >> -             tmp = (__raw_readl(EXYNOS4_CLKMUX_STATCPU)
>> >> -                     >> EXYNOS4_CLKSRC_CPU_MUXCORE_SHIFT);
>> >> -             tmp &= 0x7;
>> >> -     } while (tmp != 0x2);
>> >> -
>> >> -     clk_set_rate(mout_apll, freq * 1000);
>> >> -
>> >> -     /* MUX_CORE_SEL = APLL */
>> >> -     clk_set_parent(moutcore, mout_apll);
>> >> -
>> >> -     do {
>> >> -             cpu_relax();
>> >> -             tmp = __raw_readl(EXYNOS4_CLKMUX_STATCPU);
>> >> -             tmp &= EXYNOS4_CLKMUX_STATCPU_MUXCORE_MASK;
>> >> -     } while (tmp != (0x1 << EXYNOS4_CLKSRC_CPU_MUXCORE_SHIFT));
>> >> -}
>> >> -
>> >> -static void exynos4x12_set_frequency(unsigned int old_index,
>> >> -                               unsigned int new_index)
>> >> -{
>> >> -     if (old_index > new_index) {
>> >> -             exynos4x12_set_clkdiv(new_index);
>> >> -             exynos4x12_set_apll(new_index);
>> >> -     } else if (old_index < new_index) {
>> >> -             exynos4x12_set_apll(new_index);
>> >> -             exynos4x12_set_clkdiv(new_index);
>> >> -     }
>> >> -}
>> >> -
>> >> -int exynos4x12_cpufreq_init(struct exynos_dvfs_info *info)
>> >> -{
>> >> -     unsigned long rate;
>> >> -
>> >> -     cpu_clk = clk_get(NULL, "armclk");
>> >> -     if (IS_ERR(cpu_clk))
>> >> -             return PTR_ERR(cpu_clk);
>> >> -
>> >> -     moutcore = clk_get(NULL, "moutcore");
>> >> -     if (IS_ERR(moutcore))
>> >> -             goto err_moutcore;
>> >> -
>> >> -     mout_mpll = clk_get(NULL, "mout_mpll");
>> >> -     if (IS_ERR(mout_mpll))
>> >> -             goto err_mout_mpll;
>> >> -
>> >> -     rate = clk_get_rate(mout_mpll) / 1000;
>> >> -
>> >> -     mout_apll = clk_get(NULL, "mout_apll");
>> >> -     if (IS_ERR(mout_apll))
>> >> -             goto err_mout_apll;
>> >> -
>> >> -     if (soc_is_exynos4212())
>> >> -             apll_freq_4x12 = apll_freq_4212;
>> >> -     else
>> >> -             apll_freq_4x12 = apll_freq_4412;
>> >> -
>> >> -     info->mpll_freq_khz = rate;
>> >> -     /* 800Mhz */
>> >> -     info->pll_safe_idx = L7;
>> >> -     info->cpu_clk = cpu_clk;
>> >> -     info->volt_table = exynos4x12_volt_table;
>> >> -     info->freq_table = exynos4x12_freq_table;
>> >> -     info->set_freq = exynos4x12_set_frequency;
>> >> -
>> >> -     return 0;
>> >> -
>> >> -err_mout_apll:
>> >> -     clk_put(mout_mpll);
>> >> -err_mout_mpll:
>> >> -     clk_put(moutcore);
>> >> -err_moutcore:
>> >> -     clk_put(cpu_clk);
>> >> -
>> >> -     pr_debug("%s: failed initialization\n", __func__);
>> >> -     return -EINVAL;
>> >> -}
>> >> diff --git a/drivers/cpufreq/exynos5250-cpufreq.c
>> >> b/drivers/cpufreq/exynos5250-cpufreq.c deleted file mode 100644
>> >> index 5f90b82..0000000
>> >> --- a/drivers/cpufreq/exynos5250-cpufreq.c
>> >> +++ /dev/null
>> >> @@ -1,183 +0,0 @@
>> >> -/*
>> >> - * Copyright (c) 2010-20122Samsung Electronics Co., Ltd.
>> >> - *           http://www.samsung.com
>> >> - *
>> >> - * EXYNOS5250 - CPU frequency scaling support
>> >> - *
>> >> - * This program is free software; you can redistribute it and/or
>> >> modify
>> >> - * it under the terms of the GNU General Public License version 2
>> >> as
>> >> - * published by the Free Software Foundation.
>> >> -*/
>> >> -
>> >> -#include <linux/module.h>
>> >> -#include <linux/kernel.h>
>> >> -#include <linux/err.h>
>> >> -#include <linux/clk.h>
>> >> -#include <linux/io.h>
>> >> -#include <linux/slab.h>
>> >> -#include <linux/cpufreq.h>
>> >> -
>> >> -#include <mach/map.h>
>> >> -
>> >> -#include "exynos-cpufreq.h"
>> >> -
>> >> -static struct clk *cpu_clk;
>> >> -static struct clk *moutcore;
>> >> -static struct clk *mout_mpll;
>> >> -static struct clk *mout_apll;
>> >> -
>> >> -static unsigned int exynos5250_volt_table[] = {
>> >> -     1300000, 1250000, 1225000, 1200000, 1150000,
>> >> -     1125000, 1100000, 1075000, 1050000, 1025000,
>> >> -     1012500, 1000000,  975000,  950000,  937500,
>> >> -     925000
>> >> -};
>> >> -
>> >> -static struct cpufreq_frequency_table exynos5250_freq_table[] = {
>> >> -     {L0, 1700 * 1000},
>> >> -     {L1, 1600 * 1000},
>> >> -     {L2, 1500 * 1000},
>> >> -     {L3, 1400 * 1000},
>> >> -     {L4, 1300 * 1000},
>> >> -     {L5, 1200 * 1000},
>> >> -     {L6, 1100 * 1000},
>> >> -     {L7, 1000 * 1000},
>> >> -     {L8,  900 * 1000},
>> >> -     {L9,  800 * 1000},
>> >> -     {L10, 700 * 1000},
>> >> -     {L11, 600 * 1000},
>> >> -     {L12, 500 * 1000},
>> >> -     {L13, 400 * 1000},
>> >> -     {L14, 300 * 1000},
>> >> -     {L15, 200 * 1000},
>> >> -     {0, CPUFREQ_TABLE_END},
>> >> -};
>> >> -
>> >> -static struct apll_freq apll_freq_5250[] = {
>> >> -     /*
>> >> -      * values:
>> >> -      * freq
>> >> -      * clock divider for ARM, CPUD, ACP, PERIPH, ATB, PCLK_DBG,
>> >> APLL, ARM2
>> >> -      * clock divider for COPY, HPM, RESERVED
>> >> -      * PLL M, P, S
>> >> -      */
>> >> -     APLL_FREQ(1700, 0, 3, 7, 7, 7, 3, 5, 0, 0, 2, 0, 425, 6, 0),
>> >> -     APLL_FREQ(1600, 0, 3, 7, 7, 7, 1, 4, 0, 0, 2, 0, 200, 3, 0),
>> >> -     APLL_FREQ(1500, 0, 2, 7, 7, 7, 1, 4, 0, 0, 2, 0, 250, 4, 0),
>> >> -     APLL_FREQ(1400, 0, 2, 7, 7, 6, 1, 4, 0, 0, 2, 0, 175, 3, 0),
>> >> -     APLL_FREQ(1300, 0, 2, 7, 7, 6, 1, 3, 0, 0, 2, 0, 325, 6, 0),
>> >> -     APLL_FREQ(1200, 0, 2, 7, 7, 5, 1, 3, 0, 0, 2, 0, 200, 4, 0),
>> >> -     APLL_FREQ(1100, 0, 3, 7, 7, 5, 1, 3, 0, 0, 2, 0, 275, 6, 0),
>> >> -     APLL_FREQ(1000, 0, 1, 7, 7, 4, 1, 2, 0, 0, 2, 0, 125, 3, 0),
>> >> -     APLL_FREQ(900,  0, 1, 7, 7, 4, 1, 2, 0, 0, 2, 0, 150, 4, 0),
>> >> -     APLL_FREQ(800,  0, 1, 7, 7, 4, 1, 2, 0, 0, 2, 0, 100, 3, 0),
>> >> -     APLL_FREQ(700,  0, 1, 7, 7, 3, 1, 1, 0, 0, 2, 0, 175, 3, 1),
>> >> -     APLL_FREQ(600,  0, 1, 7, 7, 3, 1, 1, 0, 0, 2, 0, 200, 4, 1),
>> >> -     APLL_FREQ(500,  0, 1, 7, 7, 2, 1, 1, 0, 0, 2, 0, 125, 3, 1),
>> >> -     APLL_FREQ(400,  0, 1, 7, 7, 2, 1, 1, 0, 0, 2, 0, 100, 3, 1),
>> >> -     APLL_FREQ(300,  0, 1, 7, 7, 1, 1, 1, 0, 0, 2, 0, 200, 4, 2),
>> >> -     APLL_FREQ(200,  0, 1, 7, 7, 1, 1, 1, 0, 0, 2, 0, 100, 3, 2),
>> >> -};
>> >> -
>> >> -static void set_clkdiv(unsigned int div_index)
>> >> -{
>> >> -     unsigned int tmp;
>> >> -
>> >> -     /* Change Divider - CPU0 */
>> >> -
>> >> -     tmp = apll_freq_5250[div_index].clk_div_cpu0;
>> >> -
>> >> -     __raw_writel(tmp, EXYNOS5_CLKDIV_CPU0);
>> >> -
>> >> -     while (__raw_readl(EXYNOS5_CLKDIV_STATCPU0) & 0x11111111)
>> >> -             cpu_relax();
>> >> -
>> >> -     /* Change Divider - CPU1 */
>> >> -     tmp = apll_freq_5250[div_index].clk_div_cpu1;
>> >> -
>> >> -     __raw_writel(tmp, EXYNOS5_CLKDIV_CPU1);
>> >> -
>> >> -     while (__raw_readl(EXYNOS5_CLKDIV_STATCPU1) & 0x11)
>> >> -             cpu_relax();
>> >> -}
>> >> -
>> >> -static void set_apll(unsigned int index)
>> >> -{
>> >> -     unsigned int tmp;
>> >> -     unsigned int freq = apll_freq_5250[index].freq;
>> >> -
>> >> -     /* MUX_CORE_SEL = MPLL, ARMCLK uses MPLL for lock time */
>> >> -     clk_set_parent(moutcore, mout_mpll);
>> >> -
>> >> -     do {
>> >> -             cpu_relax();
>> >> -             tmp = (__raw_readl(EXYNOS5_CLKMUX_STATCPU) >> 16);
>> >> -             tmp &= 0x7;
>> >> -     } while (tmp != 0x2);
>> >> -
>> >> -     clk_set_rate(mout_apll, freq * 1000);
>> >> -
>> >> -     /* MUX_CORE_SEL = APLL */
>> >> -     clk_set_parent(moutcore, mout_apll);
>> >> -
>> >> -     do {
>> >> -             cpu_relax();
>> >> -             tmp = __raw_readl(EXYNOS5_CLKMUX_STATCPU);
>> >> -             tmp &= (0x7 << 16);
>> >> -     } while (tmp != (0x1 << 16));
>> >> -}
>> >> -
>> >> -static void exynos5250_set_frequency(unsigned int old_index,
>> >> -                               unsigned int new_index)
>> >> -{
>> >> -     if (old_index > new_index) {
>> >> -             set_clkdiv(new_index);
>> >> -             set_apll(new_index);
>> >> -     } else if (old_index < new_index) {
>> >> -             set_apll(new_index);
>> >> -             set_clkdiv(new_index);
>> >> -     }
>> >> -}
>> >> -
>> >> -int exynos5250_cpufreq_init(struct exynos_dvfs_info *info)
>> >> -{
>> >> -     unsigned long rate;
>> >> -
>> >> -     cpu_clk = clk_get(NULL, "armclk");
>> >> -     if (IS_ERR(cpu_clk))
>> >> -             return PTR_ERR(cpu_clk);
>> >> -
>> >> -     moutcore = clk_get(NULL, "mout_cpu");
>> >> -     if (IS_ERR(moutcore))
>> >> -             goto err_moutcore;
>> >> -
>> >> -     mout_mpll = clk_get(NULL, "mout_mpll");
>> >> -     if (IS_ERR(mout_mpll))
>> >> -             goto err_mout_mpll;
>> >> -
>> >> -     rate = clk_get_rate(mout_mpll) / 1000;
>> >> -
>> >> -     mout_apll = clk_get(NULL, "mout_apll");
>> >> -     if (IS_ERR(mout_apll))
>> >> -             goto err_mout_apll;
>> >> -
>> >> -     info->mpll_freq_khz = rate;
>> >> -     /* 800Mhz */
>> >> -     info->pll_safe_idx = L9;
>> >> -     info->cpu_clk = cpu_clk;
>> >> -     info->volt_table = exynos5250_volt_table;
>> >> -     info->freq_table = exynos5250_freq_table;
>> >> -     info->set_freq = exynos5250_set_frequency;
>> >> -
>> >> -     return 0;
>> >> -
>> >> -err_mout_apll:
>> >> -     clk_put(mout_mpll);
>> >> -err_mout_mpll:
>> >> -     clk_put(moutcore);
>> >> -err_moutcore:
>> >> -     clk_put(cpu_clk);
>> >> -
>> >> -     pr_err("%s: failed initialization\n", __func__);
>> >> -     return -EINVAL;
>> >> -}
>> >
>> >
>> >
>> > --
>> > Best regards,
>> >
>> > Lukasz Majewski
>> >
>> > Samsung R&D Institute Poland (SRPOL) | Linux Platform Group
>> --
>> To unsubscribe from this list: send the line "unsubscribe cpufreq" in
>> the body of a message to majordomo@xxxxxxxxxxxxxxx
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>>
>
>
>
> --
> Best regards,
>
> Lukasz Majewski
>
> Samsung R&D Institute Poland (SRPOL) | Linux Platform Group
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