These changes are the raw update to linux-4.4.6-rt14. Kernel sources

[kvmfornfv.git] / kernel / drivers / gpu / drm / nouveau / nvkm / subdev / pci / g84.c

diff --git a/kernel/drivers/gpu/drm/nouveau/nvkm/subdev/pci/g84.c b/kernel/drivers/gpu/drm/nouveau/nvkm/subdev/pci/g84.c
new file mode 100644 (file)
index 0000000..3faa6bf
--- /dev/null
+++ b/kernel/drivers/gpu/drm/nouveau/nvkm/subdev/pci/g84.c
@@ -0,0 +1,64 @@
+/*
+ * Copyright 2015 Red Hat Inc.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
+ * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
+ * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ *
+ * Authors: Ben Skeggs <bskeggs@redhat.com>
+ */
+#include "priv.h"
+
+#include <core/pci.h>
+
+void
+g84_pci_init(struct nvkm_pci *pci)
+{
+       /* The following only concerns PCIe cards. */
+       if (!pci_is_pcie(pci->pdev))
+               return;
+
+       /* Tag field is 8-bit long, regardless of EXT_TAG.
+        * However, if EXT_TAG is disabled, only the lower 5 bits of the tag
+        * field should be used, limiting the number of request to 32.
+        *
+        * Apparently, 0x041c stores some limit on the number of requests
+        * possible, so if EXT_TAG is disabled, limit that requests number to
+        * 32
+        *
+        * Fixes fdo#86537
+        */
+       if (nvkm_pci_rd32(pci, 0x007c) & 0x00000020)
+               nvkm_pci_mask(pci, 0x0080, 0x00000100, 0x00000100);
+       else
+               nvkm_pci_mask(pci, 0x041c, 0x00000060, 0x00000000);
+}
+
+static const struct nvkm_pci_func
+g84_pci_func = {
+       .init = g84_pci_init,
+       .rd32 = nv40_pci_rd32,
+       .wr08 = nv40_pci_wr08,
+       .wr32 = nv40_pci_wr32,
+       .msi_rearm = nv46_pci_msi_rearm,
+};
+
+int
+g84_pci_new(struct nvkm_device *device, int index, struct nvkm_pci **ppci)
+{
+       return nvkm_pci_new_(&g84_pci_func, device, index, ppci);
+}