Hi,
2010/5/25 Ben Dooks <ben@xxxxxxxxxxxx>:
> On 04/05/10 18:55, yajin wrote:
>> Gdium uses different freq of mclk&m1xclk of sm501. This seems a dirty
>> hack. Maybe we need a configuration option for changing the freq of
>> these clocks.
>>
>> Signed-off-by: yajin <yajin@xxxxxxxxxxxxx>
>> ---
>> drivers/mfd/sm501.c | 9 +++++++--
>> 1 files changed, 7 insertions(+), 2 deletions(-)
>>
>> diff --git a/drivers/mfd/sm501.c b/drivers/mfd/sm501.c
>> index ce5dfce..5e55cbd 100644
>> --- a/drivers/mfd/sm501.c
>> +++ b/drivers/mfd/sm501.c
>> @@ -1606,10 +1606,15 @@ static struct sm501_initdata sm501_pci_initdata = {
>> .devices = SM501_USE_ALL,
>>
>> /* Errata AB-3 says that 72MHz is the fastest available
>> - * for 33MHZ PCI with proper bus-mastering operation */
>> -
>> + * for 33MHZ PCI with proper bus-mastering operation
>> + * For gdium, it works under 84&112M clock freq.*/
>> +#ifdef CONFIG_DEXXON_GDIUM
>> + .mclk = 84 * MHZ,
>> + .m1xclk = 112 * MHZ,
>> +#else
>
> I think these frequencies are out of spec for the SM501,
> Plus, it is a hack.
> Does it not work at 72/144?
>
I have asked the similar question on loongson-dev mail list[1]. If the
mclk clock freq is set to 72M, the LCD output has some problem. But it
works well on 84M freq. Maybe Arnaud knows the reason.
[1] http://groups.google.com/group/loongson-dev/browse_thread/thread/6233a6cb67dc02d2?hl=en_US
