[PATCH] drm/amdgpu: Set the bit of ip_block_mask correspond to the IP block define

[Alex Deucher]

On Thu, Feb 1, 2018 at 3:32 PM, Liu, Shaoyun <Shaoyun.Liu at amd.com> wrote:
> Can you provide the example of which different block with the same type and why we want to do that ?
> With the old implementation , the bit mask is depends on the order that driver call the  amdgpu_device_ip_block_add(),  they are not fixed .  With this change ,at least developer can count out how to set the  bit mask after check the ip type defines and  they are fixed for amdgpu driver .
>

We don't do it today, (although we could have structured SDMA that way
on platforms that support two SDMA IPs).  The idea was that you might
have future designs that have multiple IPs on a single SoC.  E.g., two
different VCE blocks, potentially with different IP versions.

Alex

> Regards
> Shaoyun.liu
>
>
> -----Original Message-----
> From: Christian König [mailto:ckoenig.leichtzumerken at gmail.com]
> Sent: Thursday, February 01, 2018 3:17 PM
> To: Liu, Shaoyun; amd-gfx at lists.freedesktop.org
> Subject: Re: [PATCH] drm/amdgpu: Set the bit of ip_block_mask correspond to the IP block define
>
> NAK, there might be different blocks with the same type and we want to be able to disable/enable them individually.
>
> But we could improve a bit printing which block has which number during startup.
>
> Regards,
> Christian.
>
> Am 01.02.2018 um 21:10 schrieb Shaoyun Liu:
>> Change-Id: I4bdc6dbcd82f32416f65e0a38fb9c3cb580684bf
>> Signed-off-by: Shaoyun Liu <Shaoyun.Liu at amd.com>
>> ---
>>   drivers/gpu/drm/amd/amdgpu/amdgpu_device.c | 3 ++-
>>   1 file changed, 2 insertions(+), 1 deletion(-)
>>
>> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
>> b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
>> index 21be5e5..05bf9b6 100644
>> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
>> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
>> @@ -1297,7 +1297,8 @@ static int amdgpu_device_ip_early_init(struct amdgpu_device *adev)
>>       }
>>
>>       for (i = 0; i < adev->num_ip_blocks; i++) {
>> -             if ((amdgpu_ip_block_mask & (1 << i)) == 0) {
>> +             if ((amdgpu_ip_block_mask &
>> +                     (1 << adev->ip_blocks[i].version->type)) == 0) {
>>                       DRM_ERROR("disabled ip block: %d <%s>\n",
>>                                 i, adev->ip_blocks[i].version->funcs->name);
>>                       adev->ip_blocks[i].status.valid = false;
>
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