From 5cca4bdc0d0518b31c7bf8f5e8a895af01c4c90a Mon Sep 17 00:00:00 2001
From: Karol Herbst <nouveau@karolherbst.de>
Date: Tue, 5 Jan 2016 21:44:18 +0100
Subject: [PATCH] drm/nouveau/pci: implement pcie speed change for tesla

v5: don't set fermi or kepler func pointers
v6: fix alignment
---
 drivers/gpu/drm/nouveau/nvkm/subdev/pci/g84.c | 92 +++++++++++++++++++
 drivers/gpu/drm/nouveau/nvkm/subdev/pci/g94.c | 18 ++++
 .../gpu/drm/nouveau/nvkm/subdev/pci/priv.h    | 10 ++
 3 files changed, 120 insertions(+)

diff --git a/drivers/gpu/drm/nouveau/nvkm/subdev/pci/g84.c b/drivers/gpu/drm/nouveau/nvkm/subdev/pci/g84.c
index 3faa6bfb895b..62438d892f42 100644
--- a/drivers/gpu/drm/nouveau/nvkm/subdev/pci/g84.c
+++ b/drivers/gpu/drm/nouveau/nvkm/subdev/pci/g84.c
@@ -25,6 +25,80 @@
 
 #include <core/pci.h>
 
+static int
+g84_pcie_version_supported(struct nvkm_pci *pci)
+{
+	/* g84 and g86 report wrong information about what they support */
+	return 1;
+}
+
+int
+g84_pcie_version(struct nvkm_pci *pci)
+{
+	struct nvkm_device *device = pci->subdev.device;
+	return (nvkm_rd32(device, 0x00154c) & 0x1) + 1;
+}
+
+void
+g84_pcie_set_version(struct nvkm_pci *pci, u8 ver)
+{
+	struct nvkm_device *device = pci->subdev.device;
+	nvkm_mask(device, 0x00154c, 0x1, (ver >= 2 ? 0x1 : 0x0));
+}
+
+static void
+g84_pcie_set_cap_speed(struct nvkm_pci *pci, bool full_speed)
+{
+	struct nvkm_device *device = pci->subdev.device;
+	nvkm_mask(device, 0x00154c, 0x80, full_speed ? 0x80 : 0x0);
+}
+
+enum nvkm_pcie_speed
+g84_pcie_cur_speed(struct nvkm_pci *pci)
+{
+	u32 reg_v = nvkm_pci_rd32(pci, 0x88) & 0x30000;
+	switch (reg_v) {
+	case 0x30000:
+		return NVKM_PCIE_SPEED_8_0;
+	case 0x20000:
+		return NVKM_PCIE_SPEED_5_0;
+	case 0x10000:
+	default:
+		return NVKM_PCIE_SPEED_2_5;
+	}
+}
+
+enum nvkm_pcie_speed
+g84_pcie_max_speed(struct nvkm_pci *pci)
+{
+	u32 reg_v = nvkm_pci_rd32(pci, 0x460) & 0x3300;
+	if (reg_v == 0x2200)
+		return NVKM_PCIE_SPEED_5_0;
+	return NVKM_PCIE_SPEED_2_5;
+}
+
+void
+g84_pcie_set_link_speed(struct nvkm_pci *pci, enum nvkm_pcie_speed speed)
+{
+	u32 mask_value;
+
+	if (speed == NVKM_PCIE_SPEED_5_0)
+		mask_value = 0x20;
+	else
+		mask_value = 0x10;
+
+	nvkm_pci_mask(pci, 0x460, 0x30, mask_value);
+	nvkm_pci_mask(pci, 0x460, 0x1, 0x1);
+}
+
+int
+g84_pcie_set_link(struct nvkm_pci *pci, enum nvkm_pcie_speed speed, u8 width)
+{
+	g84_pcie_set_cap_speed(pci, speed == NVKM_PCIE_SPEED_5_0);
+	g84_pcie_set_link_speed(pci, speed);
+	return 0;
+}
+
 void
 g84_pci_init(struct nvkm_pci *pci)
 {
@@ -48,6 +122,14 @@ g84_pci_init(struct nvkm_pci *pci)
 		nvkm_pci_mask(pci, 0x041c, 0x00000060, 0x00000000);
 }
 
+int
+g84_pcie_init(struct nvkm_pci *pci)
+{
+	bool full_speed = g84_pcie_cur_speed(pci) == NVKM_PCIE_SPEED_5_0;
+	g84_pcie_set_cap_speed(pci, full_speed);
+	return 0;
+}
+
 static const struct nvkm_pci_func
 g84_pci_func = {
 	.init = g84_pci_init,
@@ -55,6 +137,16 @@ g84_pci_func = {
 	.wr08 = nv40_pci_wr08,
 	.wr32 = nv40_pci_wr32,
 	.msi_rearm = nv46_pci_msi_rearm,
+
+	.pcie.init = g84_pcie_init,
+	.pcie.set_link = g84_pcie_set_link,
+
+	.pcie.max_speed = g84_pcie_max_speed,
+	.pcie.cur_speed = g84_pcie_cur_speed,
+
+	.pcie.set_version = g84_pcie_set_version,
+	.pcie.version = g84_pcie_version,
+	.pcie.version_supported = g84_pcie_version_supported,
 };
 
 int
diff --git a/drivers/gpu/drm/nouveau/nvkm/subdev/pci/g94.c b/drivers/gpu/drm/nouveau/nvkm/subdev/pci/g94.c
index cd311ee311cc..43444123bc04 100644
--- a/drivers/gpu/drm/nouveau/nvkm/subdev/pci/g94.c
+++ b/drivers/gpu/drm/nouveau/nvkm/subdev/pci/g94.c
@@ -23,6 +23,14 @@
  */
 #include "priv.h"
 
+int
+g94_pcie_version_supported(struct nvkm_pci *pci)
+{
+	if ((nvkm_pci_rd32(pci, 0x460) & 0x200) == 0x200)
+		return 2;
+	return 1;
+}
+
 static const struct nvkm_pci_func
 g94_pci_func = {
 	.init = g84_pci_init,
@@ -30,6 +38,16 @@ g94_pci_func = {
 	.wr08 = nv40_pci_wr08,
 	.wr32 = nv40_pci_wr32,
 	.msi_rearm = nv40_pci_msi_rearm,
+
+	.pcie.init = g84_pcie_init,
+	.pcie.set_link = g84_pcie_set_link,
+
+	.pcie.max_speed = g84_pcie_max_speed,
+	.pcie.cur_speed = g84_pcie_cur_speed,
+
+	.pcie.set_version = g84_pcie_set_version,
+	.pcie.version = g84_pcie_version,
+	.pcie.version_supported = g94_pcie_version_supported,
 };
 
 int
diff --git a/drivers/gpu/drm/nouveau/nvkm/subdev/pci/priv.h b/drivers/gpu/drm/nouveau/nvkm/subdev/pci/priv.h
index 79eb9795dda1..8c389a61d5a1 100644
--- a/drivers/gpu/drm/nouveau/nvkm/subdev/pci/priv.h
+++ b/drivers/gpu/drm/nouveau/nvkm/subdev/pci/priv.h
@@ -36,6 +36,16 @@ void nv46_pci_msi_rearm(struct nvkm_pci *);
 void g84_pci_init(struct nvkm_pci *pci);
 
 /* pcie functions */
+void g84_pcie_set_version(struct nvkm_pci *, u8);
+int g84_pcie_version(struct nvkm_pci *);
+void g84_pcie_set_link_speed(struct nvkm_pci *, enum nvkm_pcie_speed);
+enum nvkm_pcie_speed g84_pcie_cur_speed(struct nvkm_pci *);
+enum nvkm_pcie_speed g84_pcie_max_speed(struct nvkm_pci *);
+int g84_pcie_init(struct nvkm_pci *);
+int g84_pcie_set_link(struct nvkm_pci *, enum nvkm_pcie_speed, u8);
+
+int g94_pcie_version_supported(struct nvkm_pci *);
+
 int nvkm_pcie_oneinit(struct nvkm_pci *);
 int nvkm_pcie_init(struct nvkm_pci *);
 #endif
-- 
2.39.2