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| author | Imre Deak <imre.deak@intel.com> | 2016-02-12 18:55:21 +0200 |
|---|---|---|
| committer | Imre Deak <imre.deak@intel.com> | 2016-02-17 16:17:35 +0200 |
| commit | ecb2448218acf23c401434c26be256147833b221 (patch) | |
| tree | bc2e43701e104d457227f3b5d4177737ad89722c | |
| parent | 5b0921748c0b1d0362bbfa802dc25a5c23de7e76 (diff) | |
| download | linux-ecb2448218acf23c401434c26be256147833b221.tar.gz linux-ecb2448218acf23c401434c26be256147833b221.tar.bz2 linux-ecb2448218acf23c401434c26be256147833b221.zip | |
drm/i915/lvds: Ensure the HW is powered during HW state readout
The assumption when adding the intel_display_power_is_enabled() checks
was that if it returns success the power can't be turned off afterwards
during the HW access, which is guaranteed by modeset locks. This isn't
always true, so make sure we hold a dedicated reference for the time of
the access.
Signed-off-by: Imre Deak <imre.deak@intel.com>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: http://patchwork.freedesktop.org/patch/msgid/1455296121-4742-13-git-send-email-imre.deak@intel.com
| -rw-r--r-- | drivers/gpu/drm/i915/intel_lvds.c | 14 |
1 files changed, 11 insertions, 3 deletions
diff --git a/drivers/gpu/drm/i915/intel_lvds.c b/drivers/gpu/drm/i915/intel_lvds.c index 811ddf7799f0..30a8403a8f4f 100644 --- a/drivers/gpu/drm/i915/intel_lvds.c +++ b/drivers/gpu/drm/i915/intel_lvds.c @@ -76,22 +76,30 @@ static bool intel_lvds_get_hw_state(struct intel_encoder *encoder, struct intel_lvds_encoder *lvds_encoder = to_lvds_encoder(&encoder->base); enum intel_display_power_domain power_domain; u32 tmp; + bool ret; power_domain = intel_display_port_power_domain(encoder); - if (!intel_display_power_is_enabled(dev_priv, power_domain)) + if (!intel_display_power_get_if_enabled(dev_priv, power_domain)) return false; + ret = false; + tmp = I915_READ(lvds_encoder->reg); if (!(tmp & LVDS_PORT_EN)) - return false; + goto out; if (HAS_PCH_CPT(dev)) *pipe = PORT_TO_PIPE_CPT(tmp); else *pipe = PORT_TO_PIPE(tmp); - return true; + ret = true; + +out: + intel_display_power_put(dev_priv, power_domain); + + return ret; } static void intel_lvds_get_config(struct intel_encoder *encoder, |