[git pull] drm next tree

[Jiri Kosina]

On Thu, 30 Jan 2014, Jiri Kosina wrote:

> >   git://people.freedesktop.org/~airlied/linux drm-next
> [ ... snip ... ]
> > Daniel Vetter (59):
> [ ... snip ... ]
> >       drm/i915: dp aux irq support for g4x/vlv
> 
> This commit causes all kinds of havoc on my ThinkPad x200s. It results in
[ ... snip ... ]

Not having received any response, I suggest the following for 3.14




From: Jiri Kosina <jkosina at suse.cz>
Subject: [PATCH] Revert "drm/i915: dp aux irq support for g4x/vlv"

This reverts commit 4aeebd7443e36b0a40032e518a9338f48bd27efc.

Conflicts:

	drivers/gpu/drm/i915/i915_reg.h

This commit causes all kinds of havoc on my ThinkPad x200s. It results in

 irq 16: nobody cared (try booting with the "irqpoll" option)
 CPU: 0 PID: 0 Comm: swapper/0 Not tainted 3.12.0-00854-g4aeebd7 #1
 Hardware name: LENOVO 7470BN2/7470BN2, BIOS 6DET38WW (2.02 ) 12/19/2008
  ffff8800795186c0 ffff88007c203e08 ffffffff81582503 ffff88007c203e38
  ffffffff810a6a98 ffff88007c203e88 ffff880079518600 0000000000000000
  0000000000000010 ffff88007c203e78 ffffffff810a6d43 00000010ffc4af9d
 Call Trace:
  <IRQ>  [<ffffffff81582503>] dump_stack+0x7a/0x97
  [<ffffffff810a6a98>] __report_bad_irq+0x38/0xf0
  [<ffffffff810a6d43>] note_interrupt+0x1f3/0x240
  [<ffffffff810a42d2>] handle_irq_event_percpu+0x142/0x220
  [<ffffffff810a43f9>] handle_irq_event+0x49/0x70
  [<ffffffff810a7561>] handle_fasteoi_irq+0x61/0x100
  [<ffffffff81004a89>] handle_irq+0x59/0x150
  [<ffffffff81052b6e>] ? _local_bh_enable+0xe/0x10
  [<ffffffff81052bf1>] ? irq_enter+0x81/0x90
  [<ffffffff8100403b>] do_IRQ+0x5b/0xe0
  [<ffffffff81588aaf>] common_interrupt+0x6f/0x6f
  <EOI>  [<ffffffff81588b5c>] ? retint_restore_args+0xe/0xe
  [<ffffffff8146c767>] ? poll_idle+0x47/0x90
  [<ffffffff8146c740>] ? poll_idle+0x20/0x90
  [<ffffffff810acd96>] ? ktime_get+0x56/0xd0
  [<ffffffff8146c7f0>] cpuidle_enter_state+0x40/0xd0
  [<ffffffff8146cc0a>] cpuidle_idle_call+0x10a/0x160
  [<ffffffff8100b7b9>] arch_cpu_idle+0x9/0x30
  [<ffffffff810a370b>] cpu_idle_loop+0x8b/0x270
  [<ffffffff810a390e>] cpu_startup_entry+0x1e/0x20
  [<ffffffff8157a0c3>] rest_init+0xd3/0xe0
  [<ffffffff81579ff0>] ? csum_partial_copy_generic+0x170/0x170
  [<ffffffff81ad905c>] start_kernel+0x3b3/0x461
  [<ffffffff81ad8a96>] ? repair_env_string+0x58/0x58
  [<ffffffff81ad84d1>] x86_64_start_reservations+0x1b/0x32
  [<ffffffff81ad8622>] x86_64_start_kernel+0x13a/0x141
 handlers:
 [<ffffffffa00acbc0>] usb_hcd_irq [usbcore]
 Disabling IRQ #16

and things go south afterwards (the machine hangs randomly, I/O is 
horribly slow, etc).

Signed-off-by: Jiri Kosina <jkosina at suse.cz>

---
 drivers/gpu/drm/i915/i915_irq.c |    7 -------
 drivers/gpu/drm/i915/i915_reg.h |    5 -----
 drivers/gpu/drm/i915/intel_dp.c |    2 +-
 3 files changed, 1 insertions(+), 13 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_irq.c b/drivers/gpu/drm/i915/i915_irq.c
index 17d8fcb..b7fae5b 100644
--- a/drivers/gpu/drm/i915/i915_irq.c
+++ b/drivers/gpu/drm/i915/i915_irq.c
@@ -1480,9 +1480,6 @@ static irqreturn_t valleyview_irq_handler(int irq, void *arg)
 
 			intel_hpd_irq_handler(dev, hotplug_trigger, hpd_status_i915);
 
-			if (hotplug_status & DP_AUX_CHANNEL_MASK_INT_STATUS_G4X)
-				dp_aux_irq_handler(dev);
-
 			I915_WRITE(PORT_HOTPLUG_STAT, hotplug_status);
 			I915_READ(PORT_HOTPLUG_STAT);
 		}
@@ -3670,10 +3667,6 @@ static irqreturn_t i965_irq_handler(int irq, void *arg)
 			intel_hpd_irq_handler(dev, hotplug_trigger,
 					      IS_G4X(dev) ? hpd_status_g4x : hpd_status_i915);
 
-			if (IS_G4X(dev) &&
-			    (hotplug_status & DP_AUX_CHANNEL_MASK_INT_STATUS_G4X))
-				dp_aux_irq_handler(dev);
-
 			I915_WRITE(PORT_HOTPLUG_STAT, hotplug_status);
 			I915_READ(PORT_HOTPLUG_STAT);
 		}
diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index a48b7ca..94b4cd5 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -2139,11 +2139,6 @@
 #define   CRT_HOTPLUG_MONITOR_COLOR		(3 << 8)
 #define   CRT_HOTPLUG_MONITOR_MONO		(2 << 8)
 #define   CRT_HOTPLUG_MONITOR_NONE		(0 << 8)
-#define   DP_AUX_CHANNEL_D_INT_STATUS_G4X	(1 << 6)
-#define   DP_AUX_CHANNEL_C_INT_STATUS_G4X	(1 << 5)
-#define   DP_AUX_CHANNEL_B_INT_STATUS_G4X	(1 << 4)
-#define   DP_AUX_CHANNEL_MASK_INT_STATUS_G4X	(7 << 4)
-
 /* SDVO is different across gen3/4 */
 #define   SDVOC_HOTPLUG_INT_STATUS_G4X		(1 << 3)
 #define   SDVOB_HOTPLUG_INT_STATUS_G4X		(1 << 2)
diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
index 5ede4e8..464c047 100644
--- a/drivers/gpu/drm/i915/intel_dp.c
+++ b/drivers/gpu/drm/i915/intel_dp.c
@@ -404,7 +404,7 @@ intel_dp_aux_ch(struct intel_dp *intel_dp,
 	int i, ret, recv_bytes;
 	uint32_t status;
 	int try, precharge, clock = 0;
-	bool has_aux_irq = true;
+	bool has_aux_irq = INTEL_INFO(dev)->gen >= 5 && !IS_VALLEYVIEW(dev);
 	uint32_t timeout;
 
 	/* dp aux is extremely sensitive to irq latency, hence request the
-- 
Jiri Kosina
SUSE Labs