| 1 |
On Sun, Feb 11, 2018 at 12:47 AM, Peter Humphrey <peter@××××××××××××.uk> wrote: |
| 2 |
> |
| 3 |
> [drm:dce_v11_0_afmt_setmode] *ERROR* Couldn't read SADs: 0 |
| 4 |
> [...] |
| 5 |
> traps: plugin-containe[6833] general protection ip:7f0a2e1711b1 sp:7fff6f64dc30 error:0 in ld-2.25.so[7f0a2e15c000+23000] |
| 6 |
> |
| 7 |
> What is a SAD (other than a seasonal affective disorder)? That library comes |
| 8 |
> from glibc, of which I've had 5 versions or revisions in that time |
| 9 |
|
| 10 |
Never heard of it neither. Digging into the kernel source gives |
| 11 |
|
| 12 |
static void radeon_audio_write_sad_regs(struct drm_encoder *encoder) |
| 13 |
{ |
| 14 |
struct drm_connector *connector = radeon_get_connector_for_encoder$ |
| 15 |
struct radeon_encoder *radeon_encoder = to_radeon_encoder(encoder); |
| 16 |
struct cea_sad *sads; |
| 17 |
int sad_count; |
| 18 |
|
| 19 |
if (!connector) |
| 20 |
return; |
| 21 |
|
| 22 |
sad_count = drm_edid_to_sad(radeon_connector_edid(connector), &sad$ |
| 23 |
if (sad_count <= 0) { |
| 24 |
DRM_ERROR("Couldn't read SADs: %d\n", sad_count); |
| 25 |
return; |
| 26 |
} |
| 27 |
BUG_ON(!sads); |
| 28 |
|
| 29 |
if (radeon_encoder->audio && radeon_encoder->audio->write_sad_regs) |
| 30 |
radeon_encoder->audio->write_sad_regs(encoder, sads, sad_c$ |
| 31 |
|
| 32 |
kfree(sads); |
| 33 |
} |
| 34 |
|
| 35 |
|
| 36 |
in theses files |
| 37 |
|
| 38 |
drivers/gpu/drm/radeon/radeon_audio.c |
| 39 |
drivers/gpu/drm/amd/amdgpu/dce_v6_0.c |
| 40 |
drivers/gpu/drm/amd/amdgpu/dce_v10_0.c |
| 41 |
drivers/gpu/drm/amd/amdgpu/dce_v11_0.c |
| 42 |
drivers/gpu/drm/amd/amdgpu/dce_v8_0.c |
| 43 |
|
| 44 |
which ``drm_edid_to_sad‘’ is defined in drivers/gpu/drm/drm_edid.c. |
| 45 |
Comments read |
| 46 |
|
| 47 |
/** |
| 48 |
* drm_edid_to_sad - extracts SADs from EDID |
| 49 |
* @edid: EDID to parse |
| 50 |
* @sads: pointer that will be set to the extracted SADs |
| 51 |
* |
| 52 |
* Looks for CEA EDID block and extracts SADs (Short Audio Descriptors) fr$ |
| 53 |
* |
| 54 |
* Note: The returned pointer needs to be freed using kfree(). |
| 55 |
* |
| 56 |
* Return: The number of found SADs or negative number on error. |
| 57 |
*/ |
| 58 |
|
| 59 |
Considering the term ``EDID'' and some audio related words, I think |
| 60 |
it's reading some info from your monitor. |
| 61 |
|
| 62 |
-- |
| 63 |
Silence is golden. |
Archives