[U-Boot] [PATCH] arm: socfpga: Actually enable L2 cache

[Stefan Roese <sr@denx.de>]

On 19.12.2015 11:03, Stefan Roese wrote:
> On 19.12.2015 06:58, Marek Vasut wrote:
>> The L2 cache was never enabled in the v7_outer_cache_enable(), fix
>> this and enable the L2 cache.
>>
>> Signed-off-by: Marek Vasut <marex@denx.de>
>> Cc: Dinh Nguyen <dinguyen@opensource.altera.com>
>> Cc: Chin Liang See <clsee@altera.com>
>> ---
>>   arch/arm/mach-socfpga/misc.c | 7 +++++--
>>   1 file changed, 5 insertions(+), 2 deletions(-)
>>
>> diff --git a/arch/arm/mach-socfpga/misc.c b/arch/arm/mach-socfpga/misc.c
>> index b110f5b..621f5d9 100644
>> --- a/arch/arm/mach-socfpga/misc.c
>> +++ b/arch/arm/mach-socfpga/misc.c
>> @@ -54,14 +54,17 @@ void enable_caches(void)
>>
>>   void v7_outer_cache_enable(void)
>>   {
>> -    /* disable the L2 cache */
>> -    writel(0, &pl310->pl310_ctrl);
>> +    /* Disable the L2 cache */
>> +    clrbits_le32(&pl310->pl310_ctrl, L2X0_CTRL_EN);
>>
>>       /* enable BRESP, instruction and data prefetch, full line of
>> zeroes */
>>       setbits_le32(&pl310->pl310_aux_ctrl,
>>                L310_AUX_CTRL_DATA_PREFETCH_MASK |
>>                L310_AUX_CTRL_INST_PREFETCH_MASK |
>>                L310_SHARED_ATT_OVERRIDE_ENABLE);
>> +
>> +    /* Enable the L2 cache */
>> +    setbits_le32(&pl310->pl310_ctrl, L2X0_CTRL_EN);
>
> Thanks Marek. I would be interested in some number here. Do you see
> a bigger change in the performance (ethernet driver or dhrystone)
> by enabling the L2 cache?

And another comment. It might be necessary to disable the L2 cache
when booting into Linux by providing the v7_outer_cache_enable()
function. I noticed problems in Linux with MVEBU with the L2
cache still enabled.

Thanks,
Stefan