I would say that it probably could run at 1ghz after you fixed the kernel.
On Fri, May 3, 2013 at 8:50 AM, cnyk <michak...@gmail.com> wrote:
> Hi,
> I'm asking about Samsung GT-I8160 phone. It has NovaThor U8500 chipset and
> should run at 1GHz CPU speed but it's limited by Samsung to 800MHz.
> I've compared kernels source code with GT-I9070 and GT-I8190 (they have
> same chipset but 1GHz) and that's what I found:
>
> All three devices have the same frequency table declared in
> /arch/arm/mach-ux500/devices-db8500.c file and for all three devices max
> frequency there is 800MHz.
>
> static struct cpufreq_frequency_table db8500_freq_table[] = {
> [0] = {
> .index = 0,
> .frequency = 200000,
> },
> [1] = {
> .index = 1,
> .frequency = 400000,
> },
> [2] = {
> .index = 2,
> .frequency = 800000,
> },
> #if defined(CONFIG_MACH_GAVINI)
> [3] = {
> /* Used for MAX_OPP, if available */
> .index = 3,
> .frequency = 1000000,
> },
> #else
> [3] = {
> .index = 3,
> .frequency = CPUFREQ_TABLE_END,
> },
> #endif
> [4] = {
> .index = 4,
> .frequency = CPUFREQ_TABLE_END,
> },};struct platform_device db8500_prcmu_device = {
> .name = "db8500-prcmu",
> .dev = {
> .platform_data = db8500_freq_table,
> },};
>
>
> The frequency table is modified by PRCMU driver
>
> /* /drivers/mfd/db8500-prcmu.c */
> static void db8500_prcmu_update_freq(void *pdata){
> freq_table =
> (struct cpufreq_frequency_table *)pdata;
> if (!db8500_prcmu_has_arm_maxopp())
> return;
> switch (fw_info.version.project) {
> case PRCMU_FW_PROJECT_U8500:
> case PRCMU_FW_PROJECT_U9500:
> case PRCMU_FW_PROJECT_U8420:
> case PRCMU_FW_PROJECT_U8420_SYSCLK:
> case PRCMU_FW_PROJECT_A9420:
> case PRCMU_FW_PROJECT_U8500_MBL:
> freq_table[3].frequency = 1000000;
> break;
> case PRCMU_FW_PROJECT_U8500_C2:
> case PRCMU_FW_PROJECT_U8520:
> freq_table[3].frequency = 1150000;
> break;
> default:
> break;
> }}
>
>
> Unfortunately, db8500_prcmu_has_arm_maxopp function on my device returns
> false.
>
> /* Index of different voltages to be used when accessing AVSData */#define
> PRCM_AVS_BASE 0x2FC#define PRCM_AVS_VARM_MAX_OPP
> (PRCM_AVS_BASE + 0x4)
> static bool db8500_prcmu_has_arm_maxopp(void){
> return (readb(tcdm_base + PRCM_AVS_VARM_MAX_OPP) &
> PRCM_AVS_ISMODEENABLE_MASK) == PRCM_AVS_ISMODEENABLE_MASK;}
>
> So, does it mean that it's hardware limit or software? Is there any chance
> to set CPU frequency to 1GHz?
> Greetings, Michal.
>
>
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