[PATCH v4 15/30] drm/modes: Move named modes parsing to a separate function

[Maxime Ripard <maxime@xxxxxxxxxx>]

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.

In order for the tests to still pass, some extra checks are needed, so
it's not a 1:1 move.

Signed-off-by: Maxime Ripard <maxime@xxxxxxxxxx>

---
Changes in v4:
- Fold down all the named mode patches that were split into a single
  patch again to maintain bisectability
---
 drivers/gpu/drm/drm_modes.c | 73 ++++++++++++++++++++++++++++++++++++++-------
 1 file changed, 62 insertions(+), 11 deletions(-)

diff --git a/drivers/gpu/drm/drm_modes.c b/drivers/gpu/drm/drm_modes.c
index c0dceff51cac..2f020ef2ddf2 100644
--- a/drivers/gpu/drm/drm_modes.c
+++ b/drivers/gpu/drm/drm_modes.c
@@ -2229,6 +2229,55 @@ 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;
+
+	if (!name_end)
+		return 0;
+
+	/* If the name starts with a digit, it's not a named mode */
+	if (isdigit(name[0]))
+		return 0;
+
+	/*
+	 * If there's an equal sign in the name, the command-line
+	 * contains only an option and no mode.
+	 */
+	if (strnchr(name, name_end, '='))
+		return 0;
+
+#define STR_STRICT_EQ(str, len, cmp) \
+	(str_has_prefix(str, cmp) == len)
+
+	/* The connection status extras can be set without a mode. */
+	if (STR_STRICT_EQ(name, name_end, "d") ||
+	    STR_STRICT_EQ(name, name_end, "D") ||
+	    STR_STRICT_EQ(name, name_end, "e"))
+		return 0;
+
+	/*
+	 * 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 +2314,7 @@ 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 +2355,19 @@ 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 0.11.0-dev-7da52