Re: [igt-dev] [PATCH] tests/i915_pm_rpm: improved strictness and verbosity of i2c subtest

["Ville Syrjälä" <ville.syrjala@linux.intel.com>]

On Tue, May 07, 2019 at 02:58:10PM +0300, Imre Deak wrote:
> On Tue, May 07, 2019 at 11:51:54AM +0300, Oleg Vasilev wrote:
> > Test checked that the number of valid edids from drm is equal to the
> > same number from i2c.
> > 
> > Now for each edid the whole blob is compared. In case of mismatch the
> > whole edid is printed.
> 
> Hm, if I'm parsing the code correctly we have a symlink to the
> connector's I2C device only for DP and SDVO connectors, but not for
> HDMI or VGA.

For DP the aux/i2c is a child of the connector. For everything else I
think it's a child of the pci device. SDVO looks like the non-DP case
to me, ie. i2c dev is a child of the pci dev. Which probably makes
sense in case the SDVO encoder has multiple connectors.

> 
> Jani, Ville do you know what's the reason for that? I think having a
> symlink would be useful.

Yes, symlink would be nice.

> 
> Is there another way to identify which I2C device a connector uses?
> 
> > 
> > Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=104097
> > Cc: Arkadiusz Hiler <arkadiusz.hiler@intel.com>
> > Cc: Imre Deak <imre.deak@intel.com>
> > Signed-off-by: Oleg Vasilev <oleg.vasilev@intel.com>
> > ---
> >  tests/i915/i915_pm_rpm.c | 176 ++++++++++++++++++++++++---------------
> >  1 file changed, 108 insertions(+), 68 deletions(-)
> > 
> > diff --git a/tests/i915/i915_pm_rpm.c b/tests/i915/i915_pm_rpm.c
> > index a2c9d0ed..f1530391 100644
> > --- a/tests/i915/i915_pm_rpm.c
> > +++ b/tests/i915/i915_pm_rpm.c
> > @@ -571,33 +571,56 @@ static void assert_drm_infos_equal(struct compare_data *d1,
> >  		assert_drm_crtcs_equal(d1->crtcs[i], d2->crtcs[i]);
> >  }
> >  
> > -/* We could check the checksum too, but just the header is probably enough. */
> > -static bool edid_is_valid(const unsigned char *edid)
> > +static bool find_i2c_path(char *connector_name, char *i2c_path)
> >  {
> > -	char edid_header[] = {
> > -		0x0, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0x0,
> > -	};
> > +	struct dirent *dirent;
> > +	DIR *dir;
> > +	int sysfs_card_fd = igt_sysfs_open(drm_fd);
> > +	int connector_fd = -1;
> > +	bool found_i2c_file = false;
> >  
> > -	return (memcmp(edid, edid_header, sizeof(edid_header)) == 0);
> > -}
> > +	dir = fdopendir(sysfs_card_fd);
> > +	igt_assert(dir);
> >  
> > -static int count_drm_valid_edids(struct mode_set_data *data)
> > -{
> > -	int ret = 0;
> > +	while ((dirent = readdir(dir))) {
> > +		/* Skip "cardx-" prefix */
> > +		char *dirname = dirent->d_name;
> > +		while(dirname[0] != '\0' && dirname[0] != '-')
> > +			++dirname;
> >  
> > -	if (!data->res)
> > -		return 0;
> > +		if(*dirname == '-')
> > +			++dirname;
> >  
> > -	for (int i = 0; i < data->res->count_connectors; i++)
> > -		if (data->edids[i] && edid_is_valid(data->edids[i]->data))
> > -			ret++;
> > -	return ret;
> > +		if (strcmp(dirname, connector_name) == 0) {
> > +			connector_fd = openat(sysfs_card_fd, dirent->d_name, O_RDONLY);
> > +			break;
> > +		}
> > +	}
> > +	closedir(dir);
> > +
> > +	if(connector_fd < 0)
> > +		return false;
> > +
> > +	dir = fdopendir(connector_fd);
> > +	igt_assert(dir);
> > +
> > +	while ((dirent = readdir(dir))) {
> > +		if (strncmp(dirent->d_name, "i2c-", 4) == 0) {
> > +			sprintf(i2c_path, "/dev/%s", dirent->d_name);
> > +			found_i2c_file = true;
> > +		}
> > +	}
> > +	closedir(dir);
> > +	return found_i2c_file;
> >  }
> >  
> > -static bool i2c_edid_is_valid(int fd)
> > +
> > +static bool i2c_read_edid(char *connector_name, unsigned char *edid)
> >  {
> > -	int rc;
> > -	unsigned char edid[128] = {};
> > +	char i2c_path[PATH_MAX];
> > +	bool result = find_i2c_path(connector_name, i2c_path);
> > +	int rc, fd;
> > +
> >  	struct i2c_msg msgs[] = {
> >  		{ /* Start at 0. */
> >  			.addr = 0x50,
> > @@ -616,69 +639,86 @@ static bool i2c_edid_is_valid(int fd)
> >  		.nmsgs = 2,
> >  	};
> >  
> > +
> > +	if (!result)
> > +		return false;
> > +
> > +	fd = open(i2c_path, O_RDWR);
> > +	igt_assert_neq(fd, -1);
> > +
> >  	rc = ioctl(fd, I2C_RDWR, &msgset);
> > -	return (rc >= 0) ? edid_is_valid(edid) : false;
> > +
> > +	close(fd);
> > +	return rc >= 0;
> >  }
> >  
> > -static int count_i2c_valid_edids(void)
> > +static void format_hex_string(unsigned char edid[static EDID_LENGTH],
> > +			      char buf[static EDID_LENGTH * 5 + 1])
> >  {
> > -	int fd, ret = 0;
> > -	DIR *dir;
> > +	for (size_t i = 0; i < EDID_LENGTH; ++i)
> > +		sprintf(buf+i*5, "0x%02x ", edid[i]);
> > +}
> >  
> > -	struct dirent *dirent;
> > -	char full_name[PATH_MAX];
> > +static void test_i2c(struct mode_set_data *data)
> > +{
> > +	bool failed = false;
> > +	igt_display_t display;
> > +	igt_display_require(&display, drm_fd);
> >  
> > -	dir = opendir("/dev/");
> > -	igt_assert(dir);
> > +	for (int i = 0; i < data->res->count_connectors; i++) {
> > +		unsigned char *drm_edid = data->edids[i] ? data->edids[i]->data : NULL;
> > +		unsigned char i2c_edid[EDID_LENGTH] = {};
> >  
> > -	while ((dirent = readdir(dir))) {
> > -		if (strncmp(dirent->d_name, "i2c-", 4) == 0) {
> > -			sprintf(full_name, "/dev/%s", dirent->d_name);
> > -			fd = open(full_name, O_RDWR);
> > -			igt_assert_neq(fd, -1);
> > -			if (i2c_edid_is_valid(fd))
> > -				ret++;
> > -			close(fd);
> > -		}
> > -	}
> > +		igt_output_t *output = igt_output_from_connector(&display,
> > +								 data->connectors[i]);
> > +		char *connector_name = (char *) igt_output_name(output);
> >  
> > -	closedir(dir);
> > +		bool got_i2c_edid = i2c_read_edid(connector_name, i2c_edid);
> > +		bool got_drm_edid = drm_edid != NULL;
> > +		bool is_vga = data->connectors[i]->connector_type == DRM_MODE_CONNECTOR_VGA;
> >  
> > -	return ret;
> > -}
> > +		bool edids_equal;
> >  
> > -static int count_vga_outputs(struct mode_set_data *data)
> > -{
> > -	int count = 0;
> > +		/* We fail to detect some VGA monitors using our i2c method. If you look
> > +		 * at the dmesg of these cases, you'll see the Kernel complaining about
> > +		 * the EDID reading mostly FFs and then disabling bit-banging. Since we
> > +		 * don't want to reimplement everything the Kernel does, let's just
> > +		 * accept the fact that some VGA outputs won't be properly detected. */
> > +		if(is_vga)
> > +			continue;
> >  
> > -	if (!data->res)
> > -		return 0;
> > +		if(!got_i2c_edid && !got_drm_edid)
> > +			continue;
> > +
> > +		if(got_i2c_edid && got_drm_edid)
> > +			edids_equal = (0 == memcmp(drm_edid, i2c_edid, EDID_LENGTH));
> > +		else
> > +			edids_equal = false;
> >  
> > -	for (int i = 0; i < data->res->count_connectors; i++)
> > -		if (data->connectors[i]->connector_type ==
> > -		    DRM_MODE_CONNECTOR_VGA)
> > -			count++;
> >  
> > -	return count;
> > -}
> > +		if (!edids_equal) {
> > +			char buf[5 * EDID_LENGTH + 1];
> > +			igt_critical("For connector %s EDID mismatch!\n",
> > +				     connector_name);
> >  
> > -static void test_i2c(struct mode_set_data *data)
> > -{
> > -	int i2c_edids = count_i2c_valid_edids();
> > -	int drm_edids = count_drm_valid_edids(data);
> > -	int vga_outputs = count_vga_outputs(data);
> > -	int diff;
> > -
> > -	igt_debug("i2c edids:%d drm edids:%d vga outputs:%d\n",
> > -		  i2c_edids, drm_edids, vga_outputs);
> > -
> > -	/* We fail to detect some VGA monitors using our i2c method. If you look
> > -	 * at the dmesg of these cases, you'll see the Kernel complaining about
> > -	 * the EDID reading mostly FFs and then disabling bit-banging. Since we
> > -	 * don't want to reimplement everything the Kernel does, let's just
> > -	 * accept the fact that some VGA outputs won't be properly detected. */
> > -	diff = drm_edids - i2c_edids;
> > -	igt_assert(diff <= vga_outputs && diff >= 0);
> > +			if(got_i2c_edid)
> > +				format_hex_string(i2c_edid, buf);
> > +			else
> > +				sprintf(buf, "NULL");
> > +
> > +			igt_critical("i2c: %s\n", buf);
> > +
> > +			if(got_drm_edid)
> > +				format_hex_string(drm_edid, buf);
> > +			else
> > +				sprintf(buf, "NULL");
> > +
> > +			igt_critical("drm: %s\n", buf);
> > +
> > +			failed = true;
> > +		}
> > +	}
> > +	igt_fail_on_f(failed, "Mismatch on EDID we got from i2c and DRM!\n");
> >  }
> >  
> >  static void setup_pc8(void)
> > -- 
> > 2.21.0
> > 

-- 
Ville Syrjälä
Intel
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