[PATCH] drm: radeon: r600_dma: Replace cpu_to_le32() by lower_32_bits()
Christian König
ckoenig.leichtzumerken at gmail.com
Mon Aug 16 12:47:18 UTC 2021
Am 13.08.21 um 17:03 schrieb Michel Dänzer:
> On 2021-08-13 10:54 a.m., zhaoxiao wrote:
>> This patch fixes the following sparse errors:
>> drivers/gpu/drm/radeon/r600_dma.c:247:30: warning: incorrect type in assignment (different base types)
>> drivers/gpu/drm/radeon/r600_dma.c:247:30: expected unsigned int volatile [usertype]
>> drivers/gpu/drm/radeon/r600_dma.c:247:30: got restricted __le32 [usertype]
>>
>> Signed-off-by: zhaoxiao <zhaoxiao at uniontech.com>
>> ---
>> drivers/gpu/drm/radeon/r600_dma.c | 2 +-
>> 1 file changed, 1 insertion(+), 1 deletion(-)
>>
>> diff --git a/drivers/gpu/drm/radeon/r600_dma.c b/drivers/gpu/drm/radeon/r600_dma.c
>> index fb65e6fb5c4f..a2d0b1edcd22 100644
>> --- a/drivers/gpu/drm/radeon/r600_dma.c
>> +++ b/drivers/gpu/drm/radeon/r600_dma.c
>> @@ -244,7 +244,7 @@ int r600_dma_ring_test(struct radeon_device *rdev,
>> gpu_addr = rdev->wb.gpu_addr + index;
>>
>> tmp = 0xCAFEDEAD;
>> - rdev->wb.wb[index/4] = cpu_to_le32(tmp);
>> + rdev->wb.wb[index/4] = lower_32_bits(tmp);
>>
>> r = radeon_ring_lock(rdev, ring, 4);
>> if (r) {
>>
> Seems better to mark rdev->wb.wb as little endian instead. It's read with le32_to_cpu (with some exceptions which look like bugs), which would result in 0xADEDFECA like this.
Yeah, that patch doesn't look correct at all and most likely breaks ring
test on big endian systems.
Christian.
More information about the dri-devel
mailing list