From: Geert Uytterhoeven <geert@linux-m68k.org>

It is fairly common for named video modes to contain dashes (e.g.
"tt-mid" on Atari, "dblntsc-ff" on Amiga).  Currently such mode names
are not recognized, as the dash is considered to be a separator between
mode name and bpp.

Fix this by skipping any dashes that are not followed immediately by a
digit when looking for the separator.

Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
Reviewed-by: Hans de Goede <redacted>
Signed-off-by: Maxime Ripard <redacted>

diff --git a/drivers/gpu/drm/drm_modes.c b/drivers/gpu/drm/drm_modes.c
index b4e1ff56b4d8..99a21e5cd00d 100644
--- a/drivers/gpu/drm/drm_modes.c
+++ b/drivers/gpu/drm/drm_modes.c

@@ -2263,6 +2263,8 @@ bool drm_mode_parse_command_line_for_connector(const char *mode_option,
 
 	/* Try to locate the bpp and refresh specifiers, if any */
 	bpp_ptr = strnchr(name, options_off, '-');
+	while (bpp_ptr && !isdigit(bpp_ptr[1]))
+		bpp_ptr = strnchr(bpp_ptr + 1, options_off, '-');
 	if (bpp_ptr)
 		bpp_off = bpp_ptr - name;
 

-- 
b4 0.10.0-dev-65ba7

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