linux-kernel - [PATCH 4.6 130/203] drm/amd/powerplay: need to notify system bios pcie device ready

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Date:	Mon, 25 Jul 2016 13:55:45 -0700
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org, Rex Zhu <Rex.Zhu@....com>,
	Alex Deucher <alexander.deucher@....com>,
	Ken Wang <Qingqing.Wang@....com>
Subject: [PATCH 4.6 130/203] drm/amd/powerplay: need to notify system bios pcie device ready

4.6-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Rex Zhu <Rex.Zhu@....com>

commit 0a4fef559b69ae2e682c98f31d53a225fbda78bd upstream.

before request performance state.

Signed-off-by: Rex Zhu <Rex.Zhu@....com>
Reviewed-by: Alex Deucher <alexander.deucher@....com>
Reviewed-by: Ken Wang <Qingqing.Wang@....com>
Signed-off-by: Alex Deucher <alexander.deucher@....com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/gpu/drm/amd/powerplay/hwmgr/pp_acpi.c |   16 +++++++++++++++-
 drivers/gpu/drm/amd/powerplay/inc/pp_acpi.h   |    1 +
 2 files changed, 16 insertions(+), 1 deletion(-)

--- a/drivers/gpu/drm/amd/powerplay/hwmgr/pp_acpi.c
+++ b/drivers/gpu/drm/amd/powerplay/hwmgr/pp_acpi.c
@@ -21,6 +21,20 @@ bool acpi_atcs_functions_supported(void
 	return result == 0 ? (output_buf.function_bits & (1 << (index - 1))) != 0 : false;
 }
 
+bool acpi_atcs_notify_pcie_device_ready(void *device)
+{
+	int32_t temp_buffer = 1;
+
+	return cgs_call_acpi_method(device, CGS_ACPI_METHOD_ATCS,
+				ATCS_FUNCTION_PCIE_DEVICE_READY_NOTIFICATION,
+						&temp_buffer,
+						NULL,
+						0,
+						sizeof(temp_buffer),
+						0);
+}
+
+
 int acpi_pcie_perf_request(void *device, uint8_t perf_req, bool advertise)
 {
 	struct atcs_pref_req_input atcs_input;
@@ -29,7 +43,7 @@ int acpi_pcie_perf_request(void *device,
 	int result;
 	struct cgs_system_info info = {0};
 
-	if (!acpi_atcs_functions_supported(device, ATCS_FUNCTION_PCIE_PERFORMANCE_REQUEST))
+	if( 0 != acpi_atcs_notify_pcie_device_ready(device))
 		return -EINVAL;
 
 	info.size = sizeof(struct cgs_system_info);
--- a/drivers/gpu/drm/amd/powerplay/inc/pp_acpi.h
+++ b/drivers/gpu/drm/amd/powerplay/inc/pp_acpi.h
@@ -26,3 +26,4 @@ extern bool acpi_atcs_functions_supporte
 extern int acpi_pcie_perf_request(void *device,
 						uint8_t perf_req,
 						bool advertise);
+extern bool acpi_atcs_notify_pcie_device_ready(void *device);