commit: 92441b2263866c27ef48137be5aa6c8c692652fc
From: Marcin Slusarz <[email protected]>
Date: Tue, 18 Dec 2012 20:30:47 +0100
Subject: drm/nouveau: fix blank LVDS screen regression on pre-nv50 cards
Commit 2a44e499 ("drm/nouveau/disp: introduce proper init/fini, separate
from create/destroy") started to call display init routines on pre-nv50
hardware on module load. But LVDS init code sets driver state in a way
which prevents modesetting code from operating properly.
nv04_display_init calls nv04_dfp_restore, which sets encoder->last_dpms to
NV_DPMS_CLEARED.
drm_crtc_helper_set_mode
nv04_dfp_prepare
nv04_lvds_dpms(DRM_MODE_DPMS_OFF)
nv04_lvds_dpms checks last_dpms mode (which is NV_DPMS_CLEARED) and wrongly
assumes it's a "powersaving mode", the new one (DRM_MODE_DPMS_OFF) is too,
so it skips calling some crucial lvds scripts.
Reported-by: Chris Paulson-Ellis <[email protected]>
Signed-off-by: Marcin Slusarz <[email protected]>
Signed-off-by: Ben Skeggs <[email protected]>
Cc: [email protected]
---
drivers/gpu/drm/nouveau/nv04_dfp.c | 2 +-
1 files changed, 1 insertions(+), 1 deletions(-)
diff --git a/drivers/gpu/drm/nouveau/nv04_dfp.c
b/drivers/gpu/drm/nouveau/nv04_dfp.c
index 184cdf8..39ffc07 100644
--- a/drivers/gpu/drm/nouveau/nv04_dfp.c
+++ b/drivers/gpu/drm/nouveau/nv04_dfp.c
@@ -505,7 +505,7 @@ static void nv04_dfp_update_backlight(struct drm_encoder
*encoder, int mode)
static inline bool is_powersaving_dpms(int mode)
{
- return (mode != DRM_MODE_DPMS_ON);
+ return mode != DRM_MODE_DPMS_ON && mode != NV_DPMS_CLEARED;
}
static void nv04_lvds_dpms(struct drm_encoder *encoder, int mode)
--
1.7.3.4
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