[Patch 0/4] Tegra234 Memory Interconnect followup changes

[Patch 0/4] Tegra234 Memory Interconnect followup changes

[Sumit Gupta]

This patch set adds VIC, NVDEC, NVENC, NVJPG, NVDISPLAY clients
of Memory Controller to the Tegra234 MC clients table. It also
improves error handling when some MRQ's are not supported by a
platform. For Example:
- Avoid "tegra186_emc_probe" failure if the "MRQ_EMC_DVFS_LATENCY"
  is not supported.
- Avoid Error returned by icc_set_bw() in the MC client drivers if
  the "MRQ_BWMGR_INT" is not supported.

Sumit Gupta (4):
  memory: tegra: sort tegra234_mc_clients table as per register offsets
  memory: tegra: Add clients used by DRM in Tegra234
  memory: tegra: add check if MRQ_EMC_DVFS_LATENCY is supported
  memory: tegra: make icc_set_bw return zero if BWMGR not supported

 drivers/memory/tegra/tegra186-emc.c | 136 ++++---
 drivers/memory/tegra/tegra234.c     | 604 +++++++++++++++++-----------
 2 files changed, 435 insertions(+), 305 deletions(-)

-- 
2.17.1

[Patch 1/4] memory: tegra: sort tegra234_mc_clients table as per register offsets

[Sumit Gupta]

Sort the MC client entries in "tegra234_mc_clients" table as per the
override and security register offsets. This will help to avoid
creating duplicate entries.

Signed-off-by: Sumit Gupta <sumitg@nvidia.com>
---
 drivers/memory/tegra/tegra234.c | 514 ++++++++++++++++----------------
 1 file changed, 259 insertions(+), 255 deletions(-)

diff --git a/drivers/memory/tegra/tegra234.c b/drivers/memory/tegra/tegra234.c
index 8e873a7bc34f..3e44efe4541e 100644
--- a/drivers/memory/tegra/tegra234.c
+++ b/drivers/memory/tegra/tegra234.c
@@ -12,6 +12,10 @@
 #include <soc/tegra/bpmp.h>
 #include "mc.h"
 
+/*
+ * MC Client entries are sorted in the increasing order of the
+ * override and security register offsets.
+ */
 static const struct tegra_mc_client tegra234_mc_clients[] = {
 	{
 		.id = TEGRA234_MEMORY_CLIENT_HDAR,
@@ -25,6 +29,106 @@ static const struct tegra_mc_client tegra234_mc_clients[] = {
 				.security = 0xac,
 			},
 		},
+	}, {
+		.id = TEGRA234_MEMORY_CLIENT_PCIE6AR,
+		.name = "pcie6ar",
+		.bpmp_id = TEGRA_ICC_BPMP_PCIE_6,
+		.type = TEGRA_ICC_NISO,
+		.sid = TEGRA234_SID_PCIE6,
+		.regs = {
+			.sid = {
+				.override = 0x140,
+				.security = 0x144,
+			},
+		},
+	}, {
+		.id = TEGRA234_MEMORY_CLIENT_PCIE6AW,
+		.name = "pcie6aw",
+		.bpmp_id = TEGRA_ICC_BPMP_PCIE_6,
+		.type = TEGRA_ICC_NISO,
+		.sid = TEGRA234_SID_PCIE6,
+		.regs = {
+			.sid = {
+				.override = 0x148,
+				.security = 0x14c,
+			},
+		},
+	}, {
+		.id = TEGRA234_MEMORY_CLIENT_PCIE7AR,
+		.name = "pcie7ar",
+		.bpmp_id = TEGRA_ICC_BPMP_PCIE_7,
+		.type = TEGRA_ICC_NISO,
+		.sid = TEGRA234_SID_PCIE7,
+		.regs = {
+			.sid = {
+				.override = 0x150,
+				.security = 0x154,
+			},
+		},
+	}, {
+		.id = TEGRA234_MEMORY_CLIENT_DLA0RDB,
+		.name = "dla0rdb",
+		.sid = TEGRA234_SID_NVDLA0,
+		.regs = {
+			.sid = {
+				.override = 0x160,
+				.security = 0x164,
+			},
+		},
+	}, {
+		.id = TEGRA234_MEMORY_CLIENT_DLA0RDB1,
+		.name = "dla0rdb1",
+		.sid = TEGRA234_SID_NVDLA0,
+		.regs = {
+			.sid = {
+				.override = 0x168,
+				.security = 0x16c,
+			},
+		},
+	}, {
+		.id = TEGRA234_MEMORY_CLIENT_DLA0WRB,
+		.name = "dla0wrb",
+		.sid = TEGRA234_SID_NVDLA0,
+		.regs = {
+			.sid = {
+				.override = 0x170,
+				.security = 0x174,
+			},
+		},
+	}, {
+		.id = TEGRA234_MEMORY_CLIENT_DLA1RDB,
+		.name = "dla0rdb",
+		.sid = TEGRA234_SID_NVDLA1,
+		.regs = {
+			.sid = {
+				.override = 0x178,
+				.security = 0x17c,
+			},
+		},
+	}, {
+		.id = TEGRA234_MEMORY_CLIENT_PCIE7AW,
+		.name = "pcie7aw",
+		.bpmp_id = TEGRA_ICC_BPMP_PCIE_7,
+		.type = TEGRA_ICC_NISO,
+		.sid = TEGRA234_SID_PCIE7,
+		.regs = {
+			.sid = {
+				.override = 0x180,
+				.security = 0x184,
+			},
+		},
+	}, {
+		.id = TEGRA234_MEMORY_CLIENT_PCIE8AR,
+		.name = "pcie8ar",
+		.bpmp_id = TEGRA_ICC_BPMP_PCIE_8,
+		.type = TEGRA_ICC_NISO,
+		.sid = TEGRA234_SID_PCIE8,
+		.regs = {
+			.sid = {
+				.override = 0x190,
+				.security = 0x194,
+			},
+		},
 	}, {
 		.id = TEGRA234_MEMORY_CLIENT_HDAW,
 		.name = "hdaw",
@@ -37,6 +141,102 @@ static const struct tegra_mc_client tegra234_mc_clients[] = {
 				.security = 0x1ac,
 			},
 		},
+	}, {
+		.id = TEGRA234_MEMORY_CLIENT_PCIE8AW,
+		.name = "pcie8aw",
+		.bpmp_id = TEGRA_ICC_BPMP_PCIE_8,
+		.type = TEGRA_ICC_NISO,
+		.sid = TEGRA234_SID_PCIE8,
+		.regs = {
+			.sid = {
+				.override = 0x1d8,
+				.security = 0x1dc,
+			},
+		},
+	}, {
+		.id = TEGRA234_MEMORY_CLIENT_PCIE9AR,
+		.name = "pcie9ar",
+		.bpmp_id = TEGRA_ICC_BPMP_PCIE_9,
+		.type = TEGRA_ICC_NISO,
+		.sid = TEGRA234_SID_PCIE9,
+		.regs = {
+			.sid = {
+				.override = 0x1e0,
+				.security = 0x1e4,
+			},
+		},
+	}, {
+		.id = TEGRA234_MEMORY_CLIENT_PCIE6AR1,
+		.name = "pcie6ar1",
+		.bpmp_id = TEGRA_ICC_BPMP_PCIE_6,
+		.type = TEGRA_ICC_NISO,
+		.sid = TEGRA234_SID_PCIE6,
+		.regs = {
+			.sid = {
+				.override = 0x1e8,
+				.security = 0x1ec,
+			},
+		},
+	}, {
+		.id = TEGRA234_MEMORY_CLIENT_PCIE9AW,
+		.name = "pcie9aw",
+		.bpmp_id = TEGRA_ICC_BPMP_PCIE_9,
+		.type = TEGRA_ICC_NISO,
+		.sid = TEGRA234_SID_PCIE9,
+		.regs = {
+			.sid = {
+				.override = 0x1f0,
+				.security = 0x1f4,
+			},
+		},
+	}, {
+		.id = TEGRA234_MEMORY_CLIENT_PCIE10AR,
+		.name = "pcie10ar",
+		.bpmp_id = TEGRA_ICC_BPMP_PCIE_10,
+		.type = TEGRA_ICC_NISO,
+		.sid = TEGRA234_SID_PCIE10,
+		.regs = {
+			.sid = {
+				.override = 0x1f8,
+				.security = 0x1fc,
+			},
+		},
+	}, {
+		.id = TEGRA234_MEMORY_CLIENT_PCIE10AW,
+		.name = "pcie10aw",
+		.bpmp_id = TEGRA_ICC_BPMP_PCIE_10,
+		.type = TEGRA_ICC_NISO,
+		.sid = TEGRA234_SID_PCIE10,
+		.regs = {
+			.sid = {
+				.override = 0x200,
+				.security = 0x204,
+			},
+		},
+	}, {
+		.id = TEGRA234_MEMORY_CLIENT_PCIE10AR1,
+		.name = "pcie10ar1",
+		.bpmp_id = TEGRA_ICC_BPMP_PCIE_10,
+		.type = TEGRA_ICC_NISO,
+		.sid = TEGRA234_SID_PCIE10,
+		.regs = {
+			.sid = {
+				.override = 0x240,
+				.security = 0x244,
+			},
+		},
+	}, {
+		.id = TEGRA234_MEMORY_CLIENT_PCIE7AR1,
+		.name = "pcie7ar1",
+		.bpmp_id = TEGRA_ICC_BPMP_PCIE_7,
+		.type = TEGRA_ICC_NISO,
+		.sid = TEGRA234_SID_PCIE7,
+		.regs = {
+			.sid = {
+				.override = 0x248,
+				.security = 0x24c,
+			},
+		},
 	}, {
 		.id = TEGRA234_MEMORY_CLIENT_MGBEARD,
 		.name = "mgbeard",
@@ -157,6 +357,26 @@ static const struct tegra_mc_client tegra234_mc_clients[] = {
 				.security = 0x33c,
 			},
 		},
+	}, {
+		.id = TEGRA234_MEMORY_CLIENT_DLA1RDB1,
+		.name = "dla0rdb1",
+		.sid = TEGRA234_SID_NVDLA1,
+		.regs = {
+			.sid = {
+				.override = 0x370,
+				.security = 0x374,
+			},
+		},
+	}, {
+		.id = TEGRA234_MEMORY_CLIENT_DLA1WRB,
+		.name = "dla0wrb",
+		.sid = TEGRA234_SID_NVDLA1,
+		.regs = {
+			.sid = {
+				.override = 0x378,
+				.security = 0x37c,
+			},
+		},
 	}, {
 		.id = TEGRA234_MEMORY_CLIENT_VI2W,
 		.name = "vi2w",
@@ -181,18 +401,6 @@ static const struct tegra_mc_client tegra234_mc_clients[] = {
 				.security = 0x38c,
 			},
 		},
-	}, {
-		.id = TEGRA234_MEMORY_CLIENT_VI2FALW,
-		.name = "vi2falw",
-		.bpmp_id = TEGRA_ICC_BPMP_VI2FAL,
-		.type = TEGRA_ICC_ISO_VIFAL,
-		.sid = TEGRA234_SID_ISO_VI2FALC,
-		.regs = {
-			.sid = {
-				.override = 0x3e0,
-				.security = 0x3e4,
-			},
-		},
 	}, {
 		.id = TEGRA234_MEMORY_CLIENT_APER,
 		.name = "aper",
@@ -218,27 +426,27 @@ static const struct tegra_mc_client tegra234_mc_clients[] = {
 			},
 		},
 	}, {
-		.id = TEGRA234_MEMORY_CLIENT_NVDISPLAYR,
-		.name = "nvdisplayr",
-		.bpmp_id = TEGRA_ICC_BPMP_DISPLAY,
-		.type = TEGRA_ICC_ISO_DISPLAY,
-		.sid = TEGRA234_SID_ISO_NVDISPLAY,
+		.id = TEGRA234_MEMORY_CLIENT_VI2FALW,
+		.name = "vi2falw",
+		.bpmp_id = TEGRA_ICC_BPMP_VI2FAL,
+		.type = TEGRA_ICC_ISO_VIFAL,
+		.sid = TEGRA234_SID_ISO_VI2FALC,
 		.regs = {
 			.sid = {
-				.override = 0x490,
-				.security = 0x494,
+				.override = 0x3e0,
+				.security = 0x3e4,
 			},
 		},
 	}, {
-		.id = TEGRA234_MEMORY_CLIENT_NVDISPLAYR1,
-		.name = "nvdisplayr1",
+		.id = TEGRA234_MEMORY_CLIENT_NVDISPLAYR,
+		.name = "nvdisplayr",
 		.bpmp_id = TEGRA_ICC_BPMP_DISPLAY,
 		.type = TEGRA_ICC_ISO_DISPLAY,
 		.sid = TEGRA234_SID_ISO_NVDISPLAY,
 		.regs = {
 			.sid = {
-				.override = 0x508,
-				.security = 0x50c,
+				.override = 0x490,
+				.security = 0x494,
 			},
 		},
 	}, {
@@ -305,6 +513,18 @@ static const struct tegra_mc_client tegra234_mc_clients[] = {
 				.security = 0x504,
 			},
 		},
+	}, {
+		.id = TEGRA234_MEMORY_CLIENT_NVDISPLAYR1,
+		.name = "nvdisplayr1",
+		.bpmp_id = TEGRA_ICC_BPMP_DISPLAY,
+		.type = TEGRA_ICC_ISO_DISPLAY,
+		.sid = TEGRA234_SID_ISO_NVDISPLAY,
+		.regs = {
+			.sid = {
+				.override = 0x508,
+				.security = 0x50c,
+			},
+		},
 	}, {
 		.id = TEGRA234_MEMORY_CLIENT_DLA0RDA,
 		.name = "dla0rda",
@@ -335,26 +555,6 @@ static const struct tegra_mc_client tegra234_mc_clients[] = {
 				.security = 0x604,
 			},
 		},
-	}, {
-		.id = TEGRA234_MEMORY_CLIENT_DLA0RDB,
-		.name = "dla0rdb",
-		.sid = TEGRA234_SID_NVDLA0,
-		.regs = {
-			.sid = {
-				.override = 0x160,
-				.security = 0x164,
-			},
-		},
-	}, {
-		.id = TEGRA234_MEMORY_CLIENT_DLA0RDA1,
-		.name = "dla0rda1",
-		.sid = TEGRA234_SID_NVDLA0,
-		.regs = {
-			.sid = {
-				.override = 0x748,
-				.security = 0x74c,
-			},
-		},
 	}, {
 		.id = TEGRA234_MEMORY_CLIENT_DLA0FALWRB,
 		.name = "dla0falwrb",
@@ -365,26 +565,6 @@ static const struct tegra_mc_client tegra234_mc_clients[] = {
 				.security = 0x60c,
 			},
 		},
-	}, {
-		.id = TEGRA234_MEMORY_CLIENT_DLA0RDB1,
-		.name = "dla0rdb1",
-		.sid = TEGRA234_SID_NVDLA0,
-		.regs = {
-			.sid = {
-				.override = 0x168,
-				.security = 0x16c,
-			},
-		},
-	}, {
-		.id = TEGRA234_MEMORY_CLIENT_DLA0WRB,
-		.name = "dla0wrb",
-		.sid = TEGRA234_SID_NVDLA0,
-		.regs = {
-			.sid = {
-				.override = 0x170,
-				.security = 0x174,
-			},
-		},
 	}, {
 		.id = TEGRA234_MEMORY_CLIENT_DLA1RDA,
 		.name = "dla0rda",
@@ -415,26 +595,6 @@ static const struct tegra_mc_client tegra234_mc_clients[] = {
 				.security = 0x624,
 			},
 		},
-	}, {
-		.id = TEGRA234_MEMORY_CLIENT_DLA1RDB,
-		.name = "dla0rdb",
-		.sid = TEGRA234_SID_NVDLA1,
-		.regs = {
-			.sid = {
-				.override = 0x178,
-				.security = 0x17c,
-			},
-		},
-	}, {
-		.id = TEGRA234_MEMORY_CLIENT_DLA1RDA1,
-		.name = "dla0rda1",
-		.sid = TEGRA234_SID_NVDLA1,
-		.regs = {
-			.sid = {
-				.override = 0x750,
-				.security = 0x754,
-			},
-		},
 	}, {
 		.id = TEGRA234_MEMORY_CLIENT_DLA1FALWRB,
 		.name = "dla0falwrb",
@@ -445,26 +605,6 @@ static const struct tegra_mc_client tegra234_mc_clients[] = {
 				.security = 0x62c,
 			},
 		},
-	}, {
-		.id = TEGRA234_MEMORY_CLIENT_DLA1RDB1,
-		.name = "dla0rdb1",
-		.sid = TEGRA234_SID_NVDLA1,
-		.regs = {
-			.sid = {
-				.override = 0x370,
-				.security = 0x374,
-			},
-		},
-	}, {
-		.id = TEGRA234_MEMORY_CLIENT_DLA1WRB,
-		.name = "dla0wrb",
-		.sid = TEGRA234_SID_NVDLA1,
-		.regs = {
-			.sid = {
-				.override = 0x378,
-				.security = 0x37c,
-			},
-		},
 	}, {
 		.id = TEGRA234_MEMORY_CLIENT_PCIE0R,
 		.name = "pcie0r",
@@ -610,171 +750,35 @@ static const struct tegra_mc_client tegra234_mc_clients[] = {
 			},
 		},
 	}, {
-		.id = TEGRA234_MEMORY_CLIENT_PCIE5R1,
-		.name = "pcie5r1",
-		.bpmp_id = TEGRA_ICC_BPMP_PCIE_5,
-		.type = TEGRA_ICC_NISO,
-		.sid = TEGRA234_SID_PCIE5,
-		.regs = {
-			.sid = {
-				.override = 0x778,
-				.security = 0x77c,
-			},
-		},
-	}, {
-		.id = TEGRA234_MEMORY_CLIENT_PCIE6AR,
-		.name = "pcie6ar",
-		.bpmp_id = TEGRA_ICC_BPMP_PCIE_6,
-		.type = TEGRA_ICC_NISO,
-		.sid = TEGRA234_SID_PCIE6,
-		.regs = {
-			.sid = {
-				.override = 0x140,
-				.security = 0x144,
-			},
-		},
-	}, {
-		.id = TEGRA234_MEMORY_CLIENT_PCIE6AW,
-		.name = "pcie6aw",
-		.bpmp_id = TEGRA_ICC_BPMP_PCIE_6,
-		.type = TEGRA_ICC_NISO,
-		.sid = TEGRA234_SID_PCIE6,
-		.regs = {
-			.sid = {
-				.override = 0x148,
-				.security = 0x14c,
-			},
-		},
-	}, {
-		.id = TEGRA234_MEMORY_CLIENT_PCIE6AR1,
-		.name = "pcie6ar1",
-		.bpmp_id = TEGRA_ICC_BPMP_PCIE_6,
-		.type = TEGRA_ICC_NISO,
-		.sid = TEGRA234_SID_PCIE6,
-		.regs = {
-			.sid = {
-				.override = 0x1e8,
-				.security = 0x1ec,
-			},
-		},
-	}, {
-		.id = TEGRA234_MEMORY_CLIENT_PCIE7AR,
-		.name = "pcie7ar",
-		.bpmp_id = TEGRA_ICC_BPMP_PCIE_7,
-		.type = TEGRA_ICC_NISO,
-		.sid = TEGRA234_SID_PCIE7,
-		.regs = {
-			.sid = {
-				.override = 0x150,
-				.security = 0x154,
-			},
-		},
-	}, {
-		.id = TEGRA234_MEMORY_CLIENT_PCIE7AW,
-		.name = "pcie7aw",
-		.bpmp_id = TEGRA_ICC_BPMP_PCIE_7,
-		.type = TEGRA_ICC_NISO,
-		.sid = TEGRA234_SID_PCIE7,
-		.regs = {
-			.sid = {
-				.override = 0x180,
-				.security = 0x184,
-			},
-		},
-	}, {
-		.id = TEGRA234_MEMORY_CLIENT_PCIE7AR1,
-		.name = "pcie7ar1",
-		.bpmp_id = TEGRA_ICC_BPMP_PCIE_7,
-		.type = TEGRA_ICC_NISO,
-		.sid = TEGRA234_SID_PCIE7,
-		.regs = {
-			.sid = {
-				.override = 0x248,
-				.security = 0x24c,
-			},
-		},
-	}, {
-		.id = TEGRA234_MEMORY_CLIENT_PCIE8AR,
-		.name = "pcie8ar",
-		.bpmp_id = TEGRA_ICC_BPMP_PCIE_8,
-		.type = TEGRA_ICC_NISO,
-		.sid = TEGRA234_SID_PCIE8,
-		.regs = {
-			.sid = {
-				.override = 0x190,
-				.security = 0x194,
-			},
-		},
-	}, {
-		.id = TEGRA234_MEMORY_CLIENT_PCIE8AW,
-		.name = "pcie8aw",
-		.bpmp_id = TEGRA_ICC_BPMP_PCIE_8,
-		.type = TEGRA_ICC_NISO,
-		.sid = TEGRA234_SID_PCIE8,
-		.regs = {
-			.sid = {
-				.override = 0x1d8,
-				.security = 0x1dc,
-			},
-		},
-	}, {
-		.id = TEGRA234_MEMORY_CLIENT_PCIE9AR,
-		.name = "pcie9ar",
-		.bpmp_id = TEGRA_ICC_BPMP_PCIE_9,
-		.type = TEGRA_ICC_NISO,
-		.sid = TEGRA234_SID_PCIE9,
-		.regs = {
-			.sid = {
-				.override = 0x1e0,
-				.security = 0x1e4,
-			},
-		},
-	}, {
-		.id = TEGRA234_MEMORY_CLIENT_PCIE9AW,
-		.name = "pcie9aw",
-		.bpmp_id = TEGRA_ICC_BPMP_PCIE_9,
-		.type = TEGRA_ICC_NISO,
-		.sid = TEGRA234_SID_PCIE9,
-		.regs = {
-			.sid = {
-				.override = 0x1f0,
-				.security = 0x1f4,
-			},
-		},
-	}, {
-		.id = TEGRA234_MEMORY_CLIENT_PCIE10AR,
-		.name = "pcie10ar",
-		.bpmp_id = TEGRA_ICC_BPMP_PCIE_10,
-		.type = TEGRA_ICC_NISO,
-		.sid = TEGRA234_SID_PCIE10,
+		.id = TEGRA234_MEMORY_CLIENT_DLA0RDA1,
+		.name = "dla0rda1",
+		.sid = TEGRA234_SID_NVDLA0,
 		.regs = {
 			.sid = {
-				.override = 0x1f8,
-				.security = 0x1fc,
+				.override = 0x748,
+				.security = 0x74c,
 			},
 		},
 	}, {
-		.id = TEGRA234_MEMORY_CLIENT_PCIE10AW,
-		.name = "pcie10aw",
-		.bpmp_id = TEGRA_ICC_BPMP_PCIE_10,
-		.type = TEGRA_ICC_NISO,
-		.sid = TEGRA234_SID_PCIE10,
+		.id = TEGRA234_MEMORY_CLIENT_DLA1RDA1,
+		.name = "dla0rda1",
+		.sid = TEGRA234_SID_NVDLA1,
 		.regs = {
 			.sid = {
-				.override = 0x200,
-				.security = 0x204,
+				.override = 0x750,
+				.security = 0x754,
 			},
 		},
 	}, {
-		.id = TEGRA234_MEMORY_CLIENT_PCIE10AR1,
-		.name = "pcie10ar1",
-		.bpmp_id = TEGRA_ICC_BPMP_PCIE_10,
+		.id = TEGRA234_MEMORY_CLIENT_PCIE5R1,
+		.name = "pcie5r1",
+		.bpmp_id = TEGRA_ICC_BPMP_PCIE_5,
 		.type = TEGRA_ICC_NISO,
-		.sid = TEGRA234_SID_PCIE10,
+		.sid = TEGRA234_SID_PCIE5,
 		.regs = {
 			.sid = {
-				.override = 0x240,
-				.security = 0x244,
+				.override = 0x778,
+				.security = 0x77c,
 			},
 		},
 	}, {
-- 
2.17.1

[Patch 3/4] memory: tegra: add check if MRQ_EMC_DVFS_LATENCY is supported

[Sumit Gupta]

Add check to ensure that "MRQ_EMC_DVFS_LATENCY" is supported by the
BPMP-FW before making the MRQ request. Currently, if the BPMP-FW
doesn't support this MRQ, then the "tegra186_emc_probe" fails.
Due to this the Memory Interconnect initialization also doesn't
happen. Memory Interconnect is not dependent on this MRQ and can
initialize even when this MRQ is not supported in any platform.
The check ensures that the MRQ is called only when it is supported
by the BPMP-FW and Interconnect initializes independent of this MRQ.
Also, moved the code to new function for better readability.

Signed-off-by: Sumit Gupta <sumitg@nvidia.com>
---
 drivers/memory/tegra/tegra186-emc.c | 136 +++++++++++++++-------------
 1 file changed, 71 insertions(+), 65 deletions(-)

diff --git a/drivers/memory/tegra/tegra186-emc.c b/drivers/memory/tegra/tegra186-emc.c
index 6ad8a4023dd7..83981ae3ea86 100644
--- a/drivers/memory/tegra/tegra186-emc.c
+++ b/drivers/memory/tegra/tegra186-emc.c
@@ -155,6 +155,73 @@ DEFINE_DEBUGFS_ATTRIBUTE(tegra186_emc_debug_max_rate_fops,
 			  tegra186_emc_debug_max_rate_get,
 			  tegra186_emc_debug_max_rate_set, "%llu\n");
 
+static int tegra186_emc_get_emc_dvfs_latency(struct tegra186_emc *emc)
+{
+	struct mrq_emc_dvfs_latency_response response;
+	struct tegra_bpmp_message msg;
+	unsigned int i;
+	int err;
+
+	memset(&msg, 0, sizeof(msg));
+	msg.mrq = MRQ_EMC_DVFS_LATENCY;
+	msg.tx.data = NULL;
+	msg.tx.size = 0;
+	msg.rx.data = &response;
+	msg.rx.size = sizeof(response);
+
+	err = tegra_bpmp_transfer(emc->bpmp, &msg);
+	if (err < 0) {
+		dev_err(emc->dev, "failed to EMC DVFS pairs: %d\n", err);
+		return err;
+	}
+	if (msg.rx.ret < 0) {
+		dev_err(emc->dev, "EMC DVFS MRQ failed: %d (BPMP error code)\n", msg.rx.ret);
+		return -EINVAL;
+	}
+
+	emc->debugfs.min_rate = ULONG_MAX;
+	emc->debugfs.max_rate = 0;
+
+	emc->num_dvfs = response.num_pairs;
+
+	emc->dvfs = devm_kmalloc_array(emc->dev, emc->num_dvfs, sizeof(*emc->dvfs), GFP_KERNEL);
+	if (!emc->dvfs)
+		return -ENOMEM;
+
+	dev_dbg(emc->dev, "%u DVFS pairs:\n", emc->num_dvfs);
+
+	for (i = 0; i < emc->num_dvfs; i++) {
+		emc->dvfs[i].rate = response.pairs[i].freq * 1000;
+		emc->dvfs[i].latency = response.pairs[i].latency;
+
+		if (emc->dvfs[i].rate < emc->debugfs.min_rate)
+			emc->debugfs.min_rate = emc->dvfs[i].rate;
+
+		if (emc->dvfs[i].rate > emc->debugfs.max_rate)
+			emc->debugfs.max_rate = emc->dvfs[i].rate;
+
+		dev_dbg(emc->dev, "  %2u: %lu Hz -> %lu us\n", i,
+			emc->dvfs[i].rate, emc->dvfs[i].latency);
+	}
+
+	err = clk_set_rate_range(emc->clk, emc->debugfs.min_rate, emc->debugfs.max_rate);
+	if (err < 0) {
+		dev_err(emc->dev, "failed to set rate range [%lu-%lu] for %pC\n",
+			emc->debugfs.min_rate, emc->debugfs.max_rate, emc->clk);
+		return err;
+	}
+
+	emc->debugfs.root = debugfs_create_dir("emc", NULL);
+	debugfs_create_file("available_rates", S_IRUGO, emc->debugfs.root,
+			    emc, &tegra186_emc_debug_available_rates_fops);
+	debugfs_create_file("min_rate", S_IRUGO | S_IWUSR, emc->debugfs.root,
+			    emc, &tegra186_emc_debug_min_rate_fops);
+	debugfs_create_file("max_rate", S_IRUGO | S_IWUSR, emc->debugfs.root,
+			    emc, &tegra186_emc_debug_max_rate_fops);
+
+	return 0;
+}
+
 /*
  * tegra_emc_icc_set_bw() - Set BW api for EMC provider
  * @src: ICC node for External Memory Controller (EMC)
@@ -251,10 +318,7 @@ static int tegra_emc_interconnect_init(struct tegra186_emc *emc)
 static int tegra186_emc_probe(struct platform_device *pdev)
 {
 	struct tegra_mc *mc = dev_get_drvdata(pdev->dev.parent);
-	struct mrq_emc_dvfs_latency_response response;
-	struct tegra_bpmp_message msg;
 	struct tegra186_emc *emc;
-	unsigned int i;
 	int err;
 
 	emc = devm_kzalloc(&pdev->dev, sizeof(*emc), GFP_KERNEL);
@@ -275,70 +339,12 @@ static int tegra186_emc_probe(struct platform_device *pdev)
 	platform_set_drvdata(pdev, emc);
 	emc->dev = &pdev->dev;
 
-	memset(&msg, 0, sizeof(msg));
-	msg.mrq = MRQ_EMC_DVFS_LATENCY;
-	msg.tx.data = NULL;
-	msg.tx.size = 0;
-	msg.rx.data = &response;
-	msg.rx.size = sizeof(response);
-
-	err = tegra_bpmp_transfer(emc->bpmp, &msg);
-	if (err < 0) {
-		dev_err(&pdev->dev, "failed to EMC DVFS pairs: %d\n", err);
-		goto put_bpmp;
-	}
-	if (msg.rx.ret < 0) {
-		err = -EINVAL;
-		dev_err(&pdev->dev, "EMC DVFS MRQ failed: %d (BPMP error code)\n", msg.rx.ret);
-		goto put_bpmp;
-	}
-
-	emc->debugfs.min_rate = ULONG_MAX;
-	emc->debugfs.max_rate = 0;
-
-	emc->num_dvfs = response.num_pairs;
-
-	emc->dvfs = devm_kmalloc_array(&pdev->dev, emc->num_dvfs,
-				       sizeof(*emc->dvfs), GFP_KERNEL);
-	if (!emc->dvfs) {
-		err = -ENOMEM;
-		goto put_bpmp;
-	}
-
-	dev_dbg(&pdev->dev, "%u DVFS pairs:\n", emc->num_dvfs);
-
-	for (i = 0; i < emc->num_dvfs; i++) {
-		emc->dvfs[i].rate = response.pairs[i].freq * 1000;
-		emc->dvfs[i].latency = response.pairs[i].latency;
-
-		if (emc->dvfs[i].rate < emc->debugfs.min_rate)
-			emc->debugfs.min_rate = emc->dvfs[i].rate;
-
-		if (emc->dvfs[i].rate > emc->debugfs.max_rate)
-			emc->debugfs.max_rate = emc->dvfs[i].rate;
-
-		dev_dbg(&pdev->dev, "  %2u: %lu Hz -> %lu us\n", i,
-			emc->dvfs[i].rate, emc->dvfs[i].latency);
-	}
-
-	err = clk_set_rate_range(emc->clk, emc->debugfs.min_rate,
-				 emc->debugfs.max_rate);
-	if (err < 0) {
-		dev_err(&pdev->dev,
-			"failed to set rate range [%lu-%lu] for %pC\n",
-			emc->debugfs.min_rate, emc->debugfs.max_rate,
-			emc->clk);
-		goto put_bpmp;
+	if (tegra_bpmp_mrq_is_supported(emc->bpmp, MRQ_EMC_DVFS_LATENCY)) {
+		err = tegra186_emc_get_emc_dvfs_latency(emc);
+		if (err)
+			goto put_bpmp;
 	}
 
-	emc->debugfs.root = debugfs_create_dir("emc", NULL);
-	debugfs_create_file("available_rates", S_IRUGO, emc->debugfs.root,
-			    emc, &tegra186_emc_debug_available_rates_fops);
-	debugfs_create_file("min_rate", S_IRUGO | S_IWUSR, emc->debugfs.root,
-			    emc, &tegra186_emc_debug_min_rate_fops);
-	debugfs_create_file("max_rate", S_IRUGO | S_IWUSR, emc->debugfs.root,
-			    emc, &tegra186_emc_debug_max_rate_fops);
-
 	if (mc && mc->soc->icc_ops) {
 		if (tegra_bpmp_mrq_is_supported(emc->bpmp, MRQ_BWMGR_INT)) {
 			mc->bwmgr_mrq_supported = true;
-- 
2.17.1

[Patch 4/4] memory: tegra: make icc_set_bw return zero if BWMGR not supported

[Sumit Gupta]

Return zero from icc_set_bw() to MC client driver if MRQ_BWMGR_INT
is not supported by the BPMP-FW. Currently, 'EINVAL' is returned
which causes error message in client drivers even when the platform
doesn't support scaling.

Signed-off-by: Sumit Gupta <sumitg@nvidia.com>
---
 drivers/memory/tegra/tegra234.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/memory/tegra/tegra234.c b/drivers/memory/tegra/tegra234.c
index bc73be7fe143..07aba301a173 100644
--- a/drivers/memory/tegra/tegra234.c
+++ b/drivers/memory/tegra/tegra234.c
@@ -951,7 +951,7 @@ static int tegra234_mc_icc_set(struct icc_node *src, struct icc_node *dst)
 		return 0;
 
 	if (!mc->bwmgr_mrq_supported)
-		return -EINVAL;
+		return 0;
 
 	if (!mc->bpmp) {
 		dev_err(mc->dev, "BPMP reference NULL\n");
@@ -998,7 +998,7 @@ static int tegra234_mc_icc_aggregate(struct icc_node *node, u32 tag, u32 avg_bw,
 	struct tegra_mc *mc = icc_provider_to_tegra_mc(p);
 
 	if (!mc->bwmgr_mrq_supported)
-		return -EINVAL;
+		return 0;
 
 	if (node->id == TEGRA_ICC_MC_CPU_CLUSTER0 ||
 	    node->id == TEGRA_ICC_MC_CPU_CLUSTER1 ||
-- 
2.17.1