drm/modes: parse_cmdline: Accept extras directly after mode combined with options

Before this commit it was impossible to combine an extra mode argument
specified directly after the resolution with an option, e.g.
video=HDMI-1:720x480e,rotate=180 would not work, either the "e" to force
enable would need to be dropped or the ",rotate=180", otherwise the
mode_option would not be accepted.

This commit fixes this by setting parse_extras to true in this case, so
that drm_mode_parse_cmdline_res_mode() parses the extra arguments directly
after the resolution.
Acked-by: Maxime Ripard <mripard@kernel.org>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20191118155134.30468-4-hdegoede@redhat.com

drivers/gpu/drm/drm_modes.c

@@ -1794,6 +1794,7 @@ bool drm_mode_parse_command_line_for_connector(const char *mode_option,
 		mode_end = refresh_off;
 	} else if (options_ptr) {
 		mode_end = options_off;
+		parse_extras = true;
 	} else {
 		mode_end = strlen(name);
 		parse_extras = true;

drivers/gpu/drm/selftests/drm_cmdline_selftests.h

@@ -61,3 +61,4 @@ cmdline_test(drm_cmdline_test_margin_options)
 cmdline_test(drm_cmdline_test_multiple_options)
 cmdline_test(drm_cmdline_test_invalid_option)
 cmdline_test(drm_cmdline_test_bpp_extra_and_option)
+cmdline_test(drm_cmdline_test_extra_and_option)

drivers/gpu/drm/selftests/test-drm_cmdline_parser.c

@@ -1018,6 +1018,30 @@ static int drm_cmdline_test_bpp_extra_and_option(void *ignored)
 	return 0;
 }
 
+static int drm_cmdline_test_extra_and_option(void *ignored)
+{
+	struct drm_cmdline_mode mode = { };
+
+	FAIL_ON(!drm_mode_parse_command_line_for_connector("720x480e,rotate=180",
+							   &no_connector,
+							   &mode));
+	FAIL_ON(!mode.specified);
+	FAIL_ON(mode.xres != 720);
+	FAIL_ON(mode.yres != 480);
+	FAIL_ON(mode.rotation_reflection != DRM_MODE_ROTATE_180);
+
+	FAIL_ON(mode.refresh_specified);
+	FAIL_ON(mode.bpp_specified);
+
+	FAIL_ON(mode.rb);
+	FAIL_ON(mode.cvt);
+	FAIL_ON(mode.interlace);
+	FAIL_ON(mode.margins);
+	FAIL_ON(mode.force != DRM_FORCE_ON);
+
+	return 0;
+}
+
 #include "drm_selftest.c"
 
 static int __init test_drm_cmdline_init(void)