linux-kernel - [PATCH 5.15 115/262] drm: mxsfb: Set fallback bus format when the bridge doesnt provide one

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite for Android: free password hash cracker in your pocket

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <20220307091705.713819381@linuxfoundation.org>
Date:   Mon,  7 Mar 2022 10:17:39 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Martin Kepplinger <martink@...teo.de>,
        Guido Günther <agx@...xcpu.org>,
        Lucas Stach <l.stach@...gutronix.de>,
        Sam Ravnborg <sam@...nborg.org>,
        Stefan Agner <stefan@...er.ch>, Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.15 115/262] drm: mxsfb: Set fallback bus format when the bridge doesnt provide one

From: Guido Günther <agx@...xcpu.org>

[ Upstream commit 1db060509903b29d63fe2e39c14fd0f99c4a447e ]

If a bridge doesn't do any bus format handling MEDIA_BUS_FMT_FIXED is
returned. Fallback to a reasonable default (MEDIA_BUS_FMT_RGB888_1X24) in
that case.

This unbreaks e.g. using mxsfb with the nwl bridge and mipi dsi panels.

Reported-by: Martin Kepplinger <martink@...teo.de>
Signed-off-by: Guido Günther <agx@...xcpu.org>
Reviewed-by: Lucas Stach <l.stach@...gutronix.de>
Reviewed-by: Sam Ravnborg <sam@...nborg.org>
Acked-by: Stefan Agner <stefan@...er.ch>
Link: https://patchwork.freedesktop.org/patch/msgid/781f0352052cc50c823c199ef5f53c84902d0580.1633959458.git.agx@sigxcpu.org
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/gpu/drm/mxsfb/mxsfb_kms.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/gpu/drm/mxsfb/mxsfb_kms.c b/drivers/gpu/drm/mxsfb/mxsfb_kms.c
index 89dd618d78f31..b96ba348c68d9 100644
--- a/drivers/gpu/drm/mxsfb/mxsfb_kms.c
+++ b/drivers/gpu/drm/mxsfb/mxsfb_kms.c
@@ -362,6 +362,12 @@ static void mxsfb_crtc_atomic_enable(struct drm_crtc *crtc,
 			drm_atomic_get_new_bridge_state(state,
 							mxsfb->bridge);
 		bus_format = bridge_state->input_bus_cfg.format;
+		if (bus_format == MEDIA_BUS_FMT_FIXED) {
+			dev_warn_once(drm->dev,
+				      "Bridge does not provide bus format, assuming MEDIA_BUS_FMT_RGB888_1X24.\n"
+				      "Please fix bridge driver by handling atomic_get_input_bus_fmts.\n");
+			bus_format = MEDIA_BUS_FMT_RGB888_1X24;
+		}
 	}
 
 	/* If there is no bridge, use bus format from connector */
-- 
2.34.1