From: Daniel Vetter <daniel.vetter at ffwll.ch>
commit 09153000b8ca32a539a1207edebabd0d40b6c61b
Author: Daniel Vetter <daniel.vetter at ffwll.ch>
Date: Wed Dec 12 14:06:44 2012 +0100
drm/i915: rework locking for intel_dpio|sbi_read|write
reworked the locking around sbi_read/write functions for 3.8-fixes.
But
commit dde86e2db54545ef981b64805097a7b4c3156d6e
Author: Paulo Zanoni <paulo.r.zanoni at intel.com>
Date: Sat Dec 1 12:04:25 2012 -0200
drm/i915: add lpt_init_pch_refcl
Added new use-cases in the -next tree which has not been updated in
the merge. Fix it up.
Reported-by: Ben Widawsky <ben at bwidawsk.net>
Signed-off-by: Daniel Vetter <daniel.vetter at ffwll.ch>
---
drivers/gpu/drm/i915/intel_display.c | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index 26df9e3..27fe702 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -4871,6 +4871,8 @@ static void lpt_init_pch_refclk(struct drm_device *dev)
if (!has_vga)
return;
+ mutex_lock(&dev_priv->dpio_lock);
+
/* XXX: Rip out SDV support once Haswell ships for real. */
if (IS_HASWELL(dev) && (dev->pci_device & 0xFF00) == 0x0C00)
is_sdv = true;
@@ -5013,6 +5015,8 @@ static void lpt_init_pch_refclk(struct drm_device *dev)
tmp = intel_sbi_read(dev_priv, SBI_DBUFF0, SBI_ICLK);
tmp |= SBI_DBUFF0_ENABLE;
intel_sbi_write(dev_priv, SBI_DBUFF0, tmp, SBI_ICLK);
+
+ mutex_unlock(&dev_priv->dpio_lock);
}
/*
--
1.7.10.4
