intel_disable_clock_gating: New tool for turning off clock gating on ILK.

This is something I sometimes want to do in testing, to see if a
mystery bug (say, 29172) is due to broken clock gating.  Sadly, in
this case it isn't.  Note that it isn't supported on non-ILK chipsets
yet.

.gitignore

@@ -47,6 +47,7 @@ tests/gem_bad_address
 tests/gem_bad_batch
 tests/gem_bad_blit
 tests/gem_hang
+tools/intel_disable_clock_gating
 tools/intel_error_decode
 tools/intel_gpu_dump
 tools/intel_gpu_time

lib/intel_reg.h

@@ -1566,6 +1566,13 @@ SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 #define ADPA_HSYNC_ACTIVE_HIGH	(1<<3)
 #define ADPA_HSYNC_ACTIVE_LOW	0
 
+#define PCH_DSPCLK_GATE_D	0x42020
+#define PCH_DSPRAMCLK_GATE_D	0x42024
+#define PCH_3DCGDIS0		0x46020
+#define PCH_3DCGDIS1		0x46024
+#define PCH_3DRAMCGDIS0		0x46028
+#define SOUTH_DSPCLK_GATE_D	0xc2020
+
 #define CPU_eDP_A		0x64000
 #define PCH_DP_B		0xe4100
 #define PCH_DP_C		0xe4200

tools/Makefile.am

@@ -1,4 +1,5 @@
 bin_PROGRAMS = \
+	intel_disable_clock_gating \
 	intel_audio_dump \
 	intel_bios_dumper \
 	intel_bios_reader \

tools/intel_disable_clock_gating.c

@@ -0,0 +1,72 @@
+/*
+ * Copyright © 2010 Intel Corporation
+ *
+ * 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 (including the next
+ * paragraph) 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 AUTHORS OR COPYRIGHT HOLDERS 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:
+ *	Zhenyu Wang <zhenyuw@linux.intel.com>
+ *
+ */
+
+#include <unistd.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <err.h>
+#include <string.h>
+#include "intel_gpu_tools.h"
+
+int main(int argc, char** argv)
+{
+	struct pci_device *pci_dev;
+	uint32_t temp;
+
+	pci_dev = intel_get_pci_device();
+	intel_get_mmio(pci_dev);
+
+	if (IS_IRONLAKE(pci_dev->device_id)) {
+		printf("Restore method:\n");
+
+		printf("intel_reg_write 0x%x 0x%08x\n",
+		       PCH_3DCGDIS0, INREG(PCH_3DCGDIS0));
+		OUTREG(PCH_3DCGDIS0, 0xffffffff);
+
+		printf("intel_reg_write 0x%x 0x%08x\n",
+		       PCH_3DCGDIS1, INREG(PCH_3DCGDIS1));
+		OUTREG(PCH_3DCGDIS1, 0xffffffff);
+
+		printf("intel_reg_write 0x%x 0x%08x\n",
+		       PCH_3DRAMCGDIS0, INREG(PCH_3DRAMCGDIS0));
+		OUTREG(PCH_3DRAMCGDIS0, 0xffffffff);
+
+		printf("intel_reg_write 0x%x 0x%08x\n",
+		       PCH_DSPCLK_GATE_D, INREG(PCH_DSPCLK_GATE_D));
+		OUTREG(PCH_DSPCLK_GATE_D, 0xffffffff);
+
+		printf("intel_reg_write 0x%x 0x%08x\n",
+		       PCH_DSPRAMCLK_GATE_D, INREG(PCH_DSPRAMCLK_GATE_D));
+		OUTREG(PCH_DSPRAMCLK_GATE_D, 0xffffffff);
+	} else {
+		fprintf(stderr, "unsupported chipset\n");
+	}
+
+
+	return 0;
+}
+