[Intel-gfx] [PATCH v2 14/33] drm/modes: Move named modes parsing to a separate function

[Maxime Ripard]

The current construction of the named mode parsing doesn't allow to extend
it easily. Let's move it to a separate function so we can add more
parameters and modes.

Signed-off-by: Maxime Ripard <maxime at cerno.tech>

diff --git a/drivers/gpu/drm/drm_modes.c b/drivers/gpu/drm/drm_modes.c
index a1964e08c38f..b1e800e4ed60 100644
--- a/drivers/gpu/drm/drm_modes.c
+++ b/drivers/gpu/drm/drm_modes.c
@@ -2229,6 +2229,32 @@ static const char * const drm_named_modes_whitelist[] = {
 	"PAL",
 };
 
+static int drm_mode_parse_cmdline_named_mode(const char *name,
+					     unsigned int name_end,
+					     struct drm_cmdline_mode *cmdline_mode)
+{
+	unsigned int i;
+
+	/*
+	 * We're sure we're a named mode at that point, iterate over the
+	 * list of modes we're aware of.
+	 */
+	for (i = 0; i < ARRAY_SIZE(drm_named_modes_whitelist); i++) {
+		int ret;
+
+		ret = str_has_prefix(name, drm_named_modes_whitelist[i]);
+		if (ret != name_end)
+			continue;
+
+		strcpy(cmdline_mode->name, drm_named_modes_whitelist[i]);
+		cmdline_mode->specified = true;
+
+		return 1;
+	}
+
+	return -EINVAL;
+}
+
 /**
  * drm_mode_parse_command_line_for_connector - parse command line modeline for connector
  * @mode_option: optional per connector mode option
@@ -2265,7 +2291,7 @@ bool drm_mode_parse_command_line_for_connector(const char *mode_option,
 	const char *bpp_ptr = NULL, *refresh_ptr = NULL, *extra_ptr = NULL;
 	const char *options_ptr = NULL;
 	char *bpp_end_ptr = NULL, *refresh_end_ptr = NULL;
-	int i, len, ret;
+	int len, ret;
 
 	memset(mode, 0, sizeof(*mode));
 	mode->panel_orientation = DRM_MODE_PANEL_ORIENTATION_UNKNOWN;
@@ -2306,17 +2332,19 @@ bool drm_mode_parse_command_line_for_connector(const char *mode_option,
 		parse_extras = true;
 	}
 
-	/* First check for a named mode */
-	for (i = 0; i < ARRAY_SIZE(drm_named_modes_whitelist); i++) {
-		ret = str_has_prefix(name, drm_named_modes_whitelist[i]);
-		if (ret == mode_end) {
-			if (refresh_ptr)
-				return false; /* named + refresh is invalid */
 
-			strcpy(mode->name, drm_named_modes_whitelist[i]);
-			mode->specified = true;
-			break;
-		}
+	if (mode_end) {
+		ret = drm_mode_parse_cmdline_named_mode(name, mode_end, mode);
+		if (ret < 0)
+			return false;
+
+		/*
+		 * Having a mode that starts by a letter (and thus is named)
+		 * and an at-sign (used to specify a refresh rate) is
+		 * disallowed.
+		 */
+		if (ret && refresh_ptr)
+			return false;
 	}
 
 	/* No named mode? Check for a normal mode argument, e.g. 1024x768 */

-- 
b4 0.10.0