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* [igt-dev] [RFC] tools/dpcd_dump: Introduce DPCD dump on IGT.
@ 2018-08-21  0:12 Rodrigo Vivi
  2018-08-21  1:33 ` [igt-dev] ✓ Fi.CI.BAT: success for " Patchwork
                   ` (2 more replies)
  0 siblings, 3 replies; 9+ messages in thread
From: Rodrigo Vivi @ 2018-08-21  0:12 UTC (permalink / raw)
  To: igt-dev; +Cc: Rafael Antognolli, Jani Nikula, Dhinakaran Pandiyan, Rodrigo Vivi

The idea is to remove the dump from i915's debugfs, but
before we need to be able to keep the current debug dpcd list
and IGT seems a good place to have some flexibility.

FIXME: fffff trash...

Current debugfs:

$ sudo cat /sys/kernel/debug/dri/0/DP-1/i915_dpcd
0000: 12 14 c4 01 01 00 01 00 02 02 06 00 00 00 02
0070: 00 00
0080: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0100: 14 84 00 06 06 06 06 00 01 04 00
0200: 41 00 77 77 01 03 22 22
0600: 01
0700: 01
0701: 00 00 00 00
0720: 00 01 00 00 00 01 01 00 00 00 00 00 01 00 00 01
0732: 00 00

$ sudo cat /sys/kernel/debug/dri/0/eDP-1/i915_dpcd
0000: 12 14 84 40 00 00 01 01 02 00 00 00 00 0b 00
0070: 01 00
0080: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0100: 14 04 00 00 00 00 00 00 00 00 00
0200: 41 00 00 00 80 00 66 66
0600: 01
0700: 02
0701: 9f 40 00 00
0720: 00 00 00 00 00 00 00 01 00 00 00 00 00 00 00 00
0732: 00 00

---------------------------------------------------------

Current dpcd_dump proposed here:
$ sudo ./build/tools/dpcd_dump

Dumping DPDDC-B
:
0000:  12 14 ffffffc4 01 01 00 01 00 02 02 06 00 00 00 02
0070:  00 00
0080:  00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0100:  14 ffffff84 00 06 06 06 06 00 01 04 00
0200:  41 00 77 77 01 03 22 22
0600:  01
0700:  01
0701:  00 00 00 00
0720:  00 01 00 00 00 01 01 00 00 00 00 00 01 00 00 01
0732:  00 00

DPCD DPDDC-C
 seems not available. skipping...
Dumping DPDDC-A
:
0000:  12 14 ffffff84 40 00 00 01 01 02 00 00 00 00 0b 00
0070:  01 00
0080:  00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0100:  14 04 00 00 00 00 00 00 00 00 00
0200:  41 00 00 00 ffffff80 00 66 66
0600:  01
0700:  02
0701:  ffffff9f 40 00 00
0720:  00 00 00 00 00 00 00 01 00 00 00 00 00 00 00 00
0732:  00 00

Cc: Rafael Antognolli <rafael.antognolli@intel.com>
Cc: Jani Nikula <jani.nikula@intel.com>
Cc: Dhinakaran Pandiyan <dhinakaran.pandiyan@intel.com>
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
---
 tools/Makefile.sources |   1 +
 tools/dpcd_dump.c      | 152 +++++++++++++++++++++++++++++++++++++++++
 tools/meson.build      |   1 +
 3 files changed, 154 insertions(+)
 create mode 100644 tools/dpcd_dump.c

diff --git a/tools/Makefile.sources b/tools/Makefile.sources
index abd23a0f..f4921f83 100644
--- a/tools/Makefile.sources
+++ b/tools/Makefile.sources
@@ -6,6 +6,7 @@ noinst_PROGRAMS =		\
 	$(NULL)
 
 tools_prog_lists =		\
+	dpcd_dump		\
 	igt_stats		\
 	intel_audio_dump	\
 	intel_reg		\
diff --git a/tools/dpcd_dump.c b/tools/dpcd_dump.c
new file mode 100644
index 00000000..1b989e53
--- /dev/null
+++ b/tools/dpcd_dump.c
@@ -0,0 +1,152 @@
+/*
+ * Copyright © 2018 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.
+ *
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <dirent.h>
+#include <string.h>
+
+struct dpcd_block {
+	/* DPCD dump start address. */
+	unsigned int offset;
+	/* DPCD dump size. If unset, defaults to 1. */
+	size_t size;
+};
+
+static const struct dpcd_block dpcd_dump[] = {
+	/* DP_DPCD_REV */
+	{ .offset = 0, .size = 15 },
+	/* DP_PSR_SUPPORT to DP_PSR_CAPS*/
+	{ .offset =  0x70, .size = 2 },
+	/* DP_DOWNSTREAM_PORT_0 */
+	{ .offset =  0x80, .size = 16 },
+	/* DP_LINK_BW_SET to DP_EDP_CONFIGURATION_SET */
+	{ .offset = 0x100, .size = 11 },
+	/* DP_SINK_COUNT to DP_ADJUST_REQUEST_LANE2_3 */
+	{ .offset = 0x200, .size = 8 },
+	/* DP_SET_POWER */
+	{ .offset = 0x600 },
+	/* DP_EDP_DPCD_REV */
+	{ .offset =  0x700 },
+	/* DP_EDP_GENERAL_CAP_1 to DP_EDP_GENERAL_CAP_3 */
+	{ .offset = 0x701, .size = 4 },
+	/* DP_EDP_DISPLAY_CONTROL_REGISTER to DP_EDP_BACKLIGHT_FREQ_CAP_MAX_LSB */
+	{ .offset = 0x720, .size = 16},
+	/* DP_EDP_DBC_MINIMUM_BRIGHTNESS_SET to DP_EDP_DBC_MAXIMUM_BRIGHTNESS_SET */
+	{ .offset =  0x732, .size = 2 },
+};
+
+void dump_all(int fd)
+{
+	int ret, i, j, size;
+        char buf[32];
+
+	for (i = 0; i < sizeof(dpcd_dump) / sizeof(dpcd_dump[0]); i++) {
+		ret = lseek(fd, dpcd_dump[i].offset, SEEK_SET);
+		if (ret < 0) {
+			fprintf(stderr, "lseek to %04x failed!\n", dpcd_dump[i].offset);
+			return;
+		}
+
+		size = dpcd_dump[i].size ? dpcd_dump[i].size: 1;
+		printf("%04x: ", dpcd_dump[i].offset);
+		ret = read(fd, &buf, size);
+		if (ret < 0) {
+			fprintf(stderr, "read of %d bytes to %04x failed!\n", size, dpcd_dump[i].offset);
+			return;
+		}
+
+		for (j = 0; j < size; j++)
+			printf(" %02x", buf[j]);
+		printf("\n");
+	}
+}
+
+int main(int argc, char **argv)
+{
+	struct dirent *dirent;
+	DIR *dir;
+	char dev_path[PATH_MAX];
+	char sysfs_path[PATH_MAX];
+	int dev_fd, sysfs_fd, ret = 0;
+	char dpcd_name[8];
+	char discard;
+
+	dir = opendir("/sys/class/drm_dp_aux_dev/");
+	if (!dir) {
+		fprintf(stderr, "fail to read /dev\n");
+		return -1;
+	}
+
+	while ((dirent = readdir(dir))) {
+		if (strncmp(dirent->d_name, "drm_dp_aux", 10) == 0) {
+			sprintf(dev_path, "/dev/%s", dirent->d_name);
+			sprintf(sysfs_path, "/sys/class/drm_dp_aux_dev/%s/name",
+				dirent->d_name);
+
+			sysfs_fd = open(sysfs_path, O_RDONLY);
+			if (sysfs_fd < 0) {
+				fprintf(stderr,"fail to open %s\n", sysfs_path);
+				continue;
+			}
+
+			dev_fd = open(dev_path, O_RDONLY);
+			if (dev_fd < 0) {
+				fprintf(stderr,"fail to open %s\n", dev_path);
+				continue;
+			}
+
+			ret = read(sysfs_fd, &dpcd_name, sizeof(dpcd_name));
+			if (ret < 0) {
+				fprintf(stderr, "fail to read dpcd name from %s\n\n", sysfs_path);
+				continue;
+			}
+			dpcd_name[ret] = '\0';
+
+			/* Dummy read to check if dpcd is available */
+			ret = read(dev_fd, &discard, 1);
+			if (ret != 1) {
+				fprintf(stderr, "DPCD %s seems not available. skipping...\n", dpcd_name);
+				continue;
+			}
+
+			printf("Dumping %s:\n", dpcd_name);
+			dump_all(dev_fd);
+			printf("\n");
+
+
+
+			close(sysfs_fd);
+			close(dev_fd);
+		}
+	}
+
+	closedir(dir);
+
+	return 0;
+}
diff --git a/tools/meson.build b/tools/meson.build
index e4517d66..3326a5a7 100644
--- a/tools/meson.build
+++ b/tools/meson.build
@@ -14,6 +14,7 @@ endforeach
 tools_progs = [
 	# FIXME we already have a libtestcase with this name as target
 	#'igt_stats',
+	'dpcd_dump',
 	'intel_audio_dump',
 	'intel_backlight',
 	'intel_bios_dumper',
-- 
2.17.1

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^ permalink raw reply related	[flat|nested] 9+ messages in thread
end of thread, other threads:[~2018-08-27 22:26 UTC | newest]

Thread overview: 9+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2018-08-21  0:12 [igt-dev] [RFC] tools/dpcd_dump: Introduce DPCD dump on IGT Rodrigo Vivi
2018-08-21  1:33 ` [igt-dev] ✓ Fi.CI.BAT: success for " Patchwork
2018-08-21  4:12 ` [igt-dev] ✓ Fi.CI.IGT: " Patchwork
2018-08-21  7:42 ` [igt-dev] [RFC] " Jani Nikula
2018-08-21 14:58   ` Rodrigo Vivi
2018-08-22 10:35     ` Jani Nikula
2018-08-22 16:16       ` Rodrigo Vivi
2018-08-22 17:11         ` Pandiyan, Dhinakaran
2018-08-27 22:26           ` Tarun Vyas

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