From: Rodrigo Vivi <rodrigo.vivi@intel.com>
Date: Thu, 4 Oct 2018 15:18:14 +0000 (-0700)
Subject: drm/i915/icl: MBUS B credit change
X-Git-Url: http://git.cdn.openwrt.org/?a=commitdiff_plain;h=443d5e3973e8e774addd830bc1091498b49b4bf2;p=openwrt%2Fstaging%2Fblogic.git

drm/i915/icl: MBUS B credit change

No functional change. But just a minor change to keep
up with Spec, since it has changed since commit c3cc39c539d4
("drm/i915/icl: program mbus during pipe enable")

The instructions previously said to program pipe's
B credit = 24 / number of pipes, which is 8 for ICL.
Now the spec gives us direct values independent of number
of pipes. Let's keep in sync.

Also just a reorder on fields to make easier to compare
against spec's sequence: A -> BW -> B.

Cc: Lucas De Marchi <lucas.demarchi@intel.com>
Cc: Paulo Zanoni <paulo.r.zanoni@intel.com>
Cc: Mahesh Kumar <mahesh1.kumar@intel.com>
Cc: Arthur J Runyan <arthur.j.runyan@intel.com>
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Reviewed-by: Mahesh Kumar <mahesh1.kumar@intel.com>
Reviewed-by: Lucas De Marchi <lucas.demarchi@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20181004151814.6054-1-rodrigo.vivi@intel.com
---

diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index e2e8420b17cc..1aefbc9347a6 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -5694,10 +5694,9 @@ static void icl_pipe_mbus_enable(struct intel_crtc *crtc)
 	enum pipe pipe = crtc->pipe;
 	uint32_t val;
 
-	val = MBUS_DBOX_BW_CREDIT(1) | MBUS_DBOX_A_CREDIT(2);
-
-	/* Program B credit equally to all pipes */
-	val |= MBUS_DBOX_B_CREDIT(24 / INTEL_INFO(dev_priv)->num_pipes);
+	val = MBUS_DBOX_A_CREDIT(2);
+	val |= MBUS_DBOX_BW_CREDIT(1);
+	val |= MBUS_DBOX_B_CREDIT(8);
 
 	I915_WRITE(PIPE_MBUS_DBOX_CTL(pipe), val);
 }