drm/nv50: prevent switching off SOR when in use for DVI-over-DP

Another hack because of us exposing each encoder block's function as
an encoder rather than exposing a single encoder that deals with them
all.

A proper fix will come, it's just rather invasive so this hack will
do until then.

Signed-off-by: Ben Skeggs <bskeggs@redhat.com>

diff --git a/drivers/gpu/drm/nouveau/nv50_sor.c b/drivers/gpu/drm/nouveau/nv50_sor.c
index e395c16..ecf1936 100644 (file)
--- a/drivers/gpu/drm/nouveau/nv50_sor.c
+++ b/drivers/gpu/drm/nouveau/nv50_sor.c
@@ -90,11 +90,24 @@ nv50_sor_dpms(struct drm_encoder *encoder, int mode)
 {
        struct drm_device *dev = encoder->dev;
        struct nouveau_encoder *nv_encoder = nouveau_encoder(encoder);
+       struct drm_encoder *enc;
        uint32_t val;
        int or = nv_encoder->or;
 
        NV_DEBUG_KMS(dev, "or %d mode %d\n", or, mode);
 
+       nv_encoder->last_dpms = mode;
+       list_for_each_entry(enc, &dev->mode_config.encoder_list, head) {
+               struct nouveau_encoder *nvenc = nouveau_encoder(enc);
+
+               if (nvenc == nv_encoder ||
+                   nvenc->dcb->or != nv_encoder->dcb->or)
+                       continue;
+
+               if (nvenc->last_dpms == DRM_MODE_DPMS_ON)
+                       return;
+       }
+
        /* wait for it to be done */
        if (!nv_wait(NV50_PDISPLAY_SOR_DPMS_CTRL(or),
                     NV50_PDISPLAY_SOR_DPMS_CTRL_PENDING, 0)) {