Commit 15fc156f authored by Ville Syrjälä's avatar Ville Syrjälä
Browse files

drm/i915: Probe whether SAGV works on pre-icl 



Instead of leaving the SAGV enable/disable to the first commit
let's try to disable it first thing to see if we can do it or
not (disabling SAGV is a safe thing to at any time). This avoids
running the code in this funny intermediate state where we don't
know if SAGV is available or not.

Signed-off-by: default avatarVille Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20220309164948.10671-4-ville.syrjala@linux.intel.com


Reviewed-by: default avatarStanislav Lisovskiy <stanislav.lisovskiy@intel.com>
parent c0074e71

drivers/gpu/drm/i915/intel_pm.c

+14 −0
Original line number Diff line number Diff line
@@ -57,6 +57,8 @@ 
#include "vlv_sideband.h"

#include "../../../platform/x86/intel_ips.h"



static int intel_disable_sagv(struct drm_i915_private *dev_priv);



struct drm_i915_clock_gating_funcs {

	void (*init_clock_gating)(struct drm_i915_private *i915);

};
@@ -3697,6 +3699,18 @@ intel_sagv_block_time(struct drm_i915_private *dev_priv) 


static void intel_sagv_init(struct drm_i915_private *i915)

{

	if (!intel_has_sagv(i915))

		i915->sagv_status = I915_SAGV_NOT_CONTROLLED;



	/*

	 * Probe to see if we have working SAGV control.

	 * For icl+ this was already determined by intel_bw_init_hw().

	 */

	if (DISPLAY_VER(i915) < 11)

		intel_disable_sagv(i915);



	drm_WARN_ON(&i915->drm, i915->sagv_status == I915_SAGV_UNKNOWN);



	i915->sagv_block_time_us = intel_sagv_block_time(i915);



	drm_dbg_kms(&i915->drm, "SAGV supported: %s, original SAGV block time: %u us\n",