[PATCH 5.9 019/133] drm/i915: Restore ILK-M RPS support

[Greg Kroah-Hartman]

From: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>

commit 5cbd7685b22823ebf432ec71eac1691b71c41037 upstream.

Restore RPS for ILK-M. We lost it when an extra HAS_RPS()
check appeared in intel_rps_enable().

Unfortunaltey this just makes the performance worse on my
ILK because intel_ips insists on limiting the GPU freq to
the minimum. If we don't do the RPS init then intel_ips will
not limit the frequency for whatever reason. Either it can't
get at some required information and thus makes wrong decisions,
or we mess up some weights/etc. and cause it to make the wrong
decisions when RPS init has been done, or the entire thing is
just wrong. Would require a bunch of reverse engineering to
figure out what's going on.

Cc: stable@xxxxxxxxxxxxxxx
Cc: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
Fixes: 9c878557b1eb ("drm/i915/gt: Use the RPM config register to determine clk frequencies")
Signed-off-by: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
Link: https://patchwork.freedesktop.org/patch/msgid/20201021131443.25616-1-ville.syrjala@xxxxxxxxxxxxxxx
Reviewed-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
(cherry picked from commit 2bf06370bcfb0dea5655e9a5ad460c7f7dca7739)
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@xxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

---
 drivers/gpu/drm/i915/i915_pci.c |    1 +
 1 file changed, 1 insertion(+)

--- a/drivers/gpu/drm/i915/i915_pci.c
+++ b/drivers/gpu/drm/i915/i915_pci.c
@@ -389,6 +389,7 @@ static const struct intel_device_info il
 	GEN5_FEATURES,
 	PLATFORM(INTEL_IRONLAKE),
 	.is_mobile = 1,
+	.has_rps = true,
 	.display.has_fbc = 1,
 };