[PATCH 1/4] drm/radeon: fix and simplify pot argument checks v2

[Christian König]

On 23.10.2012 18:45, Klaus Schnass wrote:
>> /**
>> + * radeon_check_pot_argument - check that argument is a power of two
>> + *
>> + * @arg: value to check
>> + *
>> + * Validates that a certain argument is a power of two (all asics).
>> + * Returns true if argument is valid.
>> + */
>> +static bool radeon_ckeck_pot_argument(int arg)
>> +{
>> +	return (arg & (arg - 1)) == 0;
>> +}
> comment says  "check_pot_argument" but is called c_K_eck_pot_argument
Good catch, that's indeed a typo.

>
>> +
>> +/**
>>   * radeon_check_arguments - validate module params
>>   *
>>   * @rdev: radeon_device pointer
>> @@ -845,52 +860,25 @@ static unsigned int radeon_vga_set_decode(void *cookie,
> bool state)
>> static void radeon_check_arguments(struct radeon_device *rdev)
>> {
>> 	/* vramlimit must be a power of two */
>> -	switch (radeon_vram_limit) {
>> -	case 0:
>> -	case 4:
>> -	case 8:
>> -	case 16:
>> -	case 32:
>> -	case 64:
>> -	case 128:
>> -	case 256:
>> -	case 512:
>> -	case 1024:
>> -	case 2048:
>> -	case 4096:
>> -		break;
>> -	default:
>> +	if (!radeon_ckeck_pot_argument(radeon_vram_limit)) {
> check_pot_argument is also true for radeon_vram_limit = 1 and 2 which was
> missing from the previous case statement, was that intentional?
Not really, but I don't see a reason why 1 and 2 MB limits shouldn't 
work (if your resolution is low enough).

Christian.

>
> Best regards,
> Klaus
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