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| author | Rodrigo Vivi <rodrigo.vivi@intel.com> | 2017-09-19 14:57:03 -0700 |
|---|---|---|
| committer | Rodrigo Vivi <rodrigo.vivi@intel.com> | 2017-09-19 16:04:56 -0700 |
| commit | 3b92e263dd4a38fa168d12a55ea4c8193483b884 (patch) | |
| tree | 1c9fabfa5a9c6bb7a77e3d4a84ae4d4c06a5765c /drivers/gpu/drm/i915/i915_irq.c | |
| parent | fb5f4e96fdf9cb7ec5e6a590e1c3fdc3b6fd1e01 (diff) | |
| download | op-kernel-dev-3b92e263dd4a38fa168d12a55ea4c8193483b884.zip op-kernel-dev-3b92e263dd4a38fa168d12a55ea4c8193483b884.tar.gz | |
drm/i915/cnp: Display Wa #1179: WaHardHangonHotPlug
"CNL PCH chance of hang when software accesses south display
registers after hotplug is enabled.
Workaround: Program 0xC2000 bits 11:8 = 0xF before enabling
south display hotplug detection."
"Workaround only needs to be applied to pre-production steppings
used in graphics capable SKUs, but it is easier to apply to
everything, and does not hurt."
v2: Moving from clock gating to right before enabling
SHOTPLUG_CTL as it should be.
v3: Align with SOUTH_CHICKEN1 (DK) and consequently use proper
spaces on bits definition since other bits around already use
new style. And now that checkpatch is not noise anymore I also
fixed the reg read mask to avoid going over 80 chars.
Suggested-by: Ben Widawsky <ben@bwidawsk.net>
Cc: Ben Widawsky <ben@bwidawsk.net>
Cc: Dhinakaran Pandiyan <dhinakaran.pandiyan@intel.com>
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Reviewed-by: Dhinakaran Pandiyan <dhinakaran.pandiyan@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20170919215703.25947-1-rodrigo.vivi@intel.com
Diffstat (limited to 'drivers/gpu/drm/i915/i915_irq.c')
| -rw-r--r-- | drivers/gpu/drm/i915/i915_irq.c | 10 |
1 files changed, 9 insertions, 1 deletions
diff --git a/drivers/gpu/drm/i915/i915_irq.c b/drivers/gpu/drm/i915/i915_irq.c index 4d0e8f7..c23efc4 100644 --- a/drivers/gpu/drm/i915/i915_irq.c +++ b/drivers/gpu/drm/i915/i915_irq.c @@ -3218,7 +3218,15 @@ static void ibx_hpd_irq_setup(struct drm_i915_private *dev_priv) static void spt_hpd_detection_setup(struct drm_i915_private *dev_priv) { - u32 hotplug; + u32 val, hotplug; + + /* Display WA #1179 WaHardHangonHotPlug: cnp */ + if (HAS_PCH_CNP(dev_priv)) { + val = I915_READ(SOUTH_CHICKEN1); + val &= ~CHASSIS_CLK_REQ_DURATION_MASK; + val |= CHASSIS_CLK_REQ_DURATION(0xf); + I915_WRITE(SOUTH_CHICKEN1, val); + } /* Enable digital hotplug on the PCH */ hotplug = I915_READ(PCH_PORT_HOTPLUG); |
