linux-kernel - [PATCH v2 3/4] drm/amdgpu: Add amdgpu_atpx_get

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Date:   Thu, 28 Jun 2018 15:14:54 -0400
From:   Lyude Paul <lyude@...hat.com>
To:     amd-gfx@...ts.freedesktop.org
Cc:     stable@...r.kernel.org, Alex Deucher <alexander.deucher@....com>,
        Christian König <christian.koenig@....com>,
        "David (ChunMing) Zhou" <David1.Zhou@....com>,
        David Airlie <airlied@...ux.ie>, Monk Liu <Monk.Liu@....com>,
        Felix Kuehling <Felix.Kuehling@....com>,
        Shaoyun Liu <Shaoyun.Liu@....com>,
        Kai-Heng Feng <kai.heng.feng@...onical.com>,
        Huang Rui <ray.huang@....com>,
        Luc Van Oostenryck <luc.vanoostenryck@...il.com>,
        dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Subject: [PATCH v2 3/4] drm/amdgpu: Add amdgpu_atpx_get_dhandle()

The handles for ACPI methods like ATPX and ATIF will live under the
integrated GPU's namespace on systems with more then one GPU. ATPX is
already detected regardless of the namespace it lives in, and it will
always be in the same namespace as ATIF. So we can make things easier on
ourselves by just adding some functions to retrieve said namespace so it
can be searched later for ATIF.

Signed-off-by: Lyude Paul <lyude@...hat.com>
Cc: stable@...r.kernel.org
---
 drivers/gpu/drm/amd/amdgpu/amdgpu.h              | 6 ++++++
 drivers/gpu/drm/amd/amdgpu/amdgpu_atpx_handler.c | 6 ++++++
 2 files changed, 12 insertions(+)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu.h b/drivers/gpu/drm/amd/amdgpu/amdgpu.h
index 7df5d3d11aff..7dcbac8af9a7 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu.h
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu.h
@@ -1858,6 +1858,12 @@ static inline bool amdgpu_atpx_dgpu_req_power_for_displays(void) { return false;
 static inline bool amdgpu_has_atpx(void) { return false; }
 #endif
 
+#if defined(CONFIG_VGA_SWITCHEROO) && defined(CONFIG_ACPI)
+void *amdgpu_atpx_get_dhandle(void);
+#else
+static inline void *amdgpu_atpx_get_dhandle(void) { return NULL; }
+#endif
+
 /*
  * KMS
  */
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_atpx_handler.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_atpx_handler.c
index a3896412a019..b33f1680c9a3 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_atpx_handler.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_atpx_handler.c
@@ -90,6 +90,12 @@ bool amdgpu_atpx_dgpu_req_power_for_displays(void) {
 	return amdgpu_atpx_priv.atpx.dgpu_req_power_for_displays;
 }
 
+#if defined(CONFIG_ACPI)
+void *amdgpu_atpx_get_dhandle(void) {
+	return amdgpu_atpx_priv.dhandle;
+}
+#endif
+
 /**
  * amdgpu_atpx_call - call an ATPX method
  *
-- 
2.17.1