drm/etnaviv: add hardware database

New versions of the Vivante kernel driver don't trust the hardware feature
bits anymore, but use an internal hardware database. This also includes
more feature fields than are available in hardware.

As we can't trust the hardware feature bits to be correct anymore, we need
to replicate the HWDB in etanviv. For now only the GC7000L as found on
the i.MX8M is supported.
Signed-off-by: Lucas Stach <l.stach@pengutronix.de>

drivers/gpu/drm/etnaviv/Makefile

@@ -9,6 +9,7 @@ etnaviv-y := \
 	etnaviv_gem_submit.o \
 	etnaviv_gem.o \
 	etnaviv_gpu.o \
+	etnaviv_hwdb.o \
 	etnaviv_iommu_v2.o \
 	etnaviv_iommu.o \
 	etnaviv_mmu.o \

drivers/gpu/drm/etnaviv/etnaviv_gpu.c

@@ -374,6 +374,13 @@ static void etnaviv_hw_identify(struct etnaviv_gpu *gpu)
 	dev_info(gpu->dev, "model: GC%x, revision: %x\n",
 		 gpu->identity.model, gpu->identity.revision);
 
+	/*
+	 * If there is a match in the HWDB, we aren't interested in the
+	 * remaining register values, as they might be wrong.
+	 */
+	if (etnaviv_fill_identity_from_hwdb(gpu))
+		return;
+
 	gpu->identity.features = gpu_read(gpu, VIVS_HI_CHIP_FEATURE);
 
 	/* Disable fast clear on GC700. */

drivers/gpu/drm/etnaviv/etnaviv_gpu.h

@@ -170,6 +170,7 @@ static inline bool fence_completed(struct etnaviv_gpu *gpu, u32 fence)
 int etnaviv_gpu_get_param(struct etnaviv_gpu *gpu, u32 param, u64 *value);
 
 int etnaviv_gpu_init(struct etnaviv_gpu *gpu);
+bool etnaviv_fill_identity_from_hwdb(struct etnaviv_gpu *gpu);
 
 #ifdef CONFIG_DEBUG_FS
 int etnaviv_gpu_debugfs(struct etnaviv_gpu *gpu, struct seq_file *m);

drivers/gpu/drm/etnaviv/etnaviv_hwdb.c

+/*
+ * Copyright (C) 2018 Etnaviv Project
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 as published by
+ * the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "etnaviv_gpu.h"
+
+static const struct etnaviv_chip_identity etnaviv_chip_identities[] = {
+	{
+		.model = 0x7000,
+		.revision = 0x6214,
+		.stream_count = 16,
+		.register_max = 64,
+		.thread_count = 1024,
+		.shader_core_count = 4,
+		.vertex_cache_size = 16,
+		.vertex_output_buffer_size = 1024,
+		.pixel_pipes = 2,
+		.instruction_count = 512,
+		.num_constants = 320,
+		.buffer_size = 0,
+		.varyings_count = 16,
+		.features = 0xe0287cad,
+		.minor_features0 = 0xc1799eff,
+		.minor_features1 = 0xfefbfad9,
+		.minor_features2 = 0xeb9d4fbf,
+		.minor_features3 = 0xedfffced,
+		.minor_features4 = 0xdb0dafc7,
+		.minor_features5 = 0xbb5ac333,
+		.minor_features6 = 0xfc8ee200,
+		.minor_features7 = 0x03fbfa6f,
+		.minor_features8 = 0x00ef0ef0,
+		.minor_features9 = 0x0edbf03c,
+		.minor_features10 = 0x90044250,
+		.minor_features11 = 0x00000024,
+	},
+};
+
+bool etnaviv_fill_identity_from_hwdb(struct etnaviv_gpu *gpu)
+{
+	struct etnaviv_chip_identity *ident = &gpu->identity;
+	int i;
+
+	for (i = 0; i < ARRAY_SIZE(etnaviv_chip_identities); i++) {
+		if (etnaviv_chip_identities[i].model == ident->model &&
+		    etnaviv_chip_identities[i].revision == ident->revision) {
+			memcpy(ident, &etnaviv_chip_identities[i],
+			       sizeof(*ident));
+			return true;
+		}
+	}
+
+	return false;
+}