[ 3.5.y.z extended stable ] Patch "drm/i915: Fix CAGF for HSW" has been added to staging queue

[Luis Henriques]

This is a note to let you know that I have just added a patch titled

    drm/i915: Fix CAGF for HSW

to the linux-3.5.y-queue branch of the 3.5.y.z extended stable tree 
which can be found at:

 http://kernel.ubuntu.com/git?p=ubuntu/linux.git;a=shortlog;h=refs/heads/linux-3.5.y-queue

If you, or anyone else, feels it should not be added to this tree, please 
reply to this email.

For more information about the 3.5.y.z tree, see
https://wiki.ubuntu.com/Kernel/Dev/ExtendedStable

Thanks.
-Luis

------

>From 5e1afd7ef5f14065348cc65920e3d7f9d6d6c006 Mon Sep 17 00:00:00 2001
From: Ben Widawsky <ben at bwidawsk.net>
Date: Tue, 29 Jan 2013 12:00:15 -0800
Subject: [PATCH] drm/i915: Fix CAGF for HSW

commit f82855d342b6c8483c56e6d2e200a71731509a39 upstream.

The shift changed, hurray.

Reported-by: Kenneth Graunke <kenneth at whitecape.org>
Cc: Paulo Zanoni <przanoni at gmail.com>
Reviewed-by: Paulo Zanoni <paulo.r.zanoni at intel.com>
Tested-by: Paulo Zanoni <paulo.r.zanoni at intel.com>
Signed-off-by: Ben Widawsky <ben at bwidawsk.net>
Signed-off-by: Daniel Vetter <daniel.vetter at ffwll.ch>
[ luis: removed reference to GT_FREQUENCY_MULTIPLIER, replacing it by 50 ]
Signed-off-by: Luis Henriques <luis.henriques at canonical.com>
---
 drivers/gpu/drm/i915/i915_debugfs.c | 10 +++++++---
 drivers/gpu/drm/i915/i915_reg.h     |  2 ++
 2 files changed, 9 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_debugfs.c b/drivers/gpu/drm/i915/i915_debugfs.c
index ca472ca..3459e27 100644
--- a/drivers/gpu/drm/i915/i915_debugfs.c
+++ b/drivers/gpu/drm/i915/i915_debugfs.c
@@ -894,7 +894,7 @@ static int i915_cur_delayinfo(struct seq_file *m, void *unused)
 		u32 gt_perf_status = I915_READ(GEN6_GT_PERF_STATUS);
 		u32 rp_state_limits = I915_READ(GEN6_RP_STATE_LIMITS);
 		u32 rp_state_cap = I915_READ(GEN6_RP_STATE_CAP);
-		u32 rpstat;
+		u32 rpstat, cagf;
 		u32 rpupei, rpcurup, rpprevup;
 		u32 rpdownei, rpcurdown, rpprevdown;
 		int max_freq;
@@ -913,6 +913,11 @@ static int i915_cur_delayinfo(struct seq_file *m, void *unused)
 		rpdownei = I915_READ(GEN6_RP_CUR_DOWN_EI);
 		rpcurdown = I915_READ(GEN6_RP_CUR_DOWN);
 		rpprevdown = I915_READ(GEN6_RP_PREV_DOWN);
+		if (IS_HASWELL(dev))
+			cagf = (rpstat & HSW_CAGF_MASK) >> HSW_CAGF_SHIFT;
+		else
+			cagf = (rpstat & GEN6_CAGF_MASK) >> GEN6_CAGF_SHIFT;
+		cagf *= 50;

 		gen6_gt_force_wake_put(dev_priv);
 		mutex_unlock(&dev->struct_mutex);
@@ -925,8 +930,7 @@ static int i915_cur_delayinfo(struct seq_file *m, void *unused)
 			   gt_perf_status & 0xff);
 		seq_printf(m, "Render p-state limit: %d\n",
 			   rp_state_limits & 0xff);
-		seq_printf(m, "CAGF: %dMHz\n", ((rpstat & GEN6_CAGF_MASK) >>
-						GEN6_CAGF_SHIFT) * 50);
+		seq_printf(m, "CAGF: %dMHz\n", cagf);
 		seq_printf(m, "RP CUR UP EI: %dus\n", rpupei &
 			   GEN6_CURICONT_MASK);
 		seq_printf(m, "RP CUR UP: %dus\n", rpcurup &
diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index 44feabe..26b8bba 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -4045,7 +4045,9 @@
 #define GEN6_RP_INTERRUPT_LIMITS		0xA014
 #define GEN6_RPSTAT1				0xA01C
 #define   GEN6_CAGF_SHIFT			8
+#define   HSW_CAGF_SHIFT			7
 #define   GEN6_CAGF_MASK			(0x7f << GEN6_CAGF_SHIFT)
+#define   HSW_CAGF_MASK				(0x7f << HSW_CAGF_SHIFT)
 #define GEN6_RP_CONTROL				0xA024
 #define   GEN6_RP_MEDIA_TURBO			(1<<11)
 #define   GEN6_RP_MEDIA_MODE_MASK		(3<<9)
--
1.8.1.2