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drm/nouveau/kms: Don't clear DP_MST_CTRL DPCD in nv50_mstm_new()

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Since commit fa3cdf8d0b ("drm/nouveau: Reset MST branching unit before
enabling") we've been clearing DP_MST_CTRL before we start enabling MST.
Since then clearing DP_MST_CTRL in nv50_mstm_new() has been unnecessary
and redundant, so let's remove it.

Signed-off-by: Lyude Paul <lyude@redhat.com>
Reviewed-by: Ben Skeggs <bskeggs@redhat.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20200826182456.322681-6-lyude@redhat.com
This commit is contained in:
Lyude Paul 2020-08-26 14:24:41 -04:00
parent 57940402b5
commit 254e7e3bfc
1 changed files with 0 additions and 11 deletions
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11
drivers/gpu/drm/nouveau/dispnv50/disp.c
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@ -1535,17 +1535,6 @@ nv50_mstm_new(struct nouveau_encoder *outp, struct drm_dp_aux *aux, int aux_max,
struct drm_device *dev = outp->base.base.dev;
struct nv50_mstm *mstm;
int ret;
u8 dpcd;
/* This is a workaround for some monitors not functioning
* correctly in MST mode on initial module load. I think
* some bad interaction with the VBIOS may be responsible.
*
* A good ol' off and on again seems to work here ;)
*/
ret = drm_dp_dpcd_readb(aux, DP_DPCD_REV, &dpcd);
if (ret >= 0 && dpcd >= 0x12)
drm_dp_dpcd_writeb(aux, DP_MSTM_CTRL, 0);
if (!(mstm = *pmstm = kzalloc(sizeof(*mstm), GFP_KERNEL)))
return -ENOMEM;