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From:   Geert Uytterhoeven <geert@linux-m68k.org>
To:     Maarten Lankhorst <maarten.lankhorst@linux.intel.com>,
        Maxime Ripard <mripard@kernel.org>,
        Thomas Zimmermann <tzimmermann@suse.de>,
        David Airlie <airlied@linux.ie>,
        Daniel Vetter <daniel@ffwll.ch>,
        Hans de Goede <hdegoede@redhat.com>
Cc:     dri-devel@lists.freedesktop.org, linux-fbdev@vger.kernel.org,
        linux-m68k@vger.kernel.org, linux-kernel@vger.kernel.org,
        Geert Uytterhoeven <geert@linux-m68k.org>
Subject: [PATCH v2 5/5] drm/modes: parse_cmdline: Add support for named modes containing dashes
Date:   Thu, 14 Jul 2022 11:04:10 +0200
Message-Id: <2eb205da88c3cb19ddf04d167ece4e16a330948b.1657788997.git.geert@linux-m68k.org>
In-Reply-To: <cover.1657788997.git.geert@linux-m68k.org>
References: <cover.1657788997.git.geert@linux-m68k.org>
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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 <hdegoede@redhat.com>
---
v2:
  - Add Reviewed-by.
---
 drivers/gpu/drm/drm_modes.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/gpu/drm/drm_modes.c b/drivers/gpu/drm/drm_modes.c
index bfc3a08614522689..c5f490de70314176 100644
--- a/drivers/gpu/drm/drm_modes.c
+++ b/drivers/gpu/drm/drm_modes.c
@@ -1827,6 +1827,8 @@ bool drm_mode_parse_command_line_for_connector(const char *mode_option,
 
 	/* Try to locate the bpp and refresh specifiers, if any */
 	bpp_ptr = strchr(name, '-');
+	while (bpp_ptr && !isdigit(bpp_ptr[1]))
+		bpp_ptr = strchr(bpp_ptr + 1, '-');
 	if (bpp_ptr)
 		bpp_off = bpp_ptr - name;
 
-- 
2.25.1