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[0324/1094] drm/i915: add init power domain to always-on power wells

Message ID 1413889294-31328-325-git-send-email-dheerajx.s.jamwal@intel.com (mailing list archive)
State New, archived
Headers show

Commit Message

Dheeraj Jamwal Oct. 21, 2014, 10:48 a.m. UTC 
From: Imre Deak <imre.deak@intel.com>

Whenever we request a power domain it has to guarantee that all HW
resources are enabled that are needed to access a HW register associated
with that power domain. In case a register is on an always-on power well
this won't result in turning on a power well, but it may require
enabling some other HW resource. One such resource is the HSW/BDW device
D0 state that is required for all register accesses and thus for all
power wells/power domains.

So far the init power domain (guaranteeing access to all HW registers)
was part of the default i9xx always-on power well, but not the HSW/BDW
always-on power wells. Add the domain to the latter power wells too.

Atm, all the always-on power wells have noop handlers, so this doesn't
change the functionality.

v2:
- clarify semantics of always-on power wells (Paulo)

Signed-off-by: Imre Deak <imre.deak@intel.com>
Reviewed-by: Jesse Barnes <jbarnes@virtuousgeek.org>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
(cherry picked from commit f5938f363535b1723f81bd5debcb7ce5161ece95)

Signed-off-by: Dheeraj Jamwal <dheerajx.s.jamwal@intel.com>
---
 drivers/gpu/drm/i915/intel_pm.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)
diff mbox

Patch

diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c
index e3ee8d3..0804383 100644
--- a/drivers/gpu/drm/i915/intel_pm.c
+++ b/drivers/gpu/drm/i915/intel_pm.c
@@ -5451,7 +5451,8 @@  EXPORT_SYMBOL_GPL(i915_release_power_well);
 
 #define HSW_ALWAYS_ON_POWER_DOMAINS (			\
 	BIT(POWER_DOMAIN_PIPE_A) |			\
-	BIT(POWER_DOMAIN_TRANSCODER_EDP))
+	BIT(POWER_DOMAIN_TRANSCODER_EDP) |		\
+	BIT(POWER_DOMAIN_INIT))
 #define HSW_DISPLAY_POWER_DOMAINS (				\
 	(POWER_DOMAIN_MASK & ~HSW_ALWAYS_ON_POWER_DOMAINS) |	\
 	BIT(POWER_DOMAIN_INIT))