[Intel-gfx] [PATCH] drm/i915/slpc: Set rps' min and max frequencies even with SLPC.

[Rodrigo Vivi]

We need to inform PCODE of a desired ring frequencies so PCODE update
the memory frequencies to us. rps->min_freq and rps->max_freq are the
frequencies used in that request. However they were unset when SLPC was
enabled and PCODE never updated the memory freq.

Let's at least for now get these freq set up so we can inform PCODE.

Cc: Ashutosh Dixit <ashutosh.dixit at intel.com>
Tested-by: Sushma Venkatesh Reddy <sushma.venkatesh.reddy at intel.com>
Signed-off-by: Rodrigo Vivi <rodrigo.vivi at intel.com>
---
 drivers/gpu/drm/i915/gt/intel_rps.c | 18 +++++++++++++++++-
 1 file changed, 17 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/i915/gt/intel_rps.c b/drivers/gpu/drm/i915/gt/intel_rps.c
index 8c289a032103..58a82978d5df 100644
--- a/drivers/gpu/drm/i915/gt/intel_rps.c
+++ b/drivers/gpu/drm/i915/gt/intel_rps.c
@@ -1128,6 +1128,20 @@ void gen6_rps_get_freq_caps(struct intel_rps *rps, struct intel_rps_freq_caps *c
 	}
 }
 
+static void rps_basic_init_for_slpc(struct intel_rps *rps)
+{
+	struct intel_rps_freq_caps caps;
+
+	/*
+	 * Even with SLPC we need to initialize at least a basic min and max
+	 * frequency so we can inform pcode a desired IA ring frequency in
+	 * gen6_update_ring_freq
+	 */
+	gen6_rps_get_freq_caps(rps, &caps);
+	rps->min_freq = caps.min_freq;
+	rps->max_freq = caps.rp0_freq;
+}
+
 static void gen6_rps_init(struct intel_rps *rps)
 {
 	struct drm_i915_private *i915 = rps_to_i915(rps);
@@ -1970,8 +1984,10 @@ void intel_rps_init(struct intel_rps *rps)
 {
 	struct drm_i915_private *i915 = rps_to_i915(rps);
 
-	if (rps_uses_slpc(rps))
+	if (rps_uses_slpc(rps)) {
+		rps_basic_init_for_slpc(rps);
 		return;
+	}
 
 	if (IS_CHERRYVIEW(i915))
 		chv_rps_init(rps);
-- 
2.37.1