Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.35 as permitted sender) client-ip=23.128.96.35;
From:   Liu Ying <victor.liu@nxp.com>
To:     linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org
Cc:     linux-next@vger.kernel.org, sfr@canb.auug.org.au,
        gregkh@linuxfoundation.org, rafael@kernel.org,
        andrzej.hajda@intel.com, neil.armstrong@linaro.org,
        rfoss@kernel.org, Laurent.pinchart@ideasonboard.com,
        jonas@kwiboo.se, jernej.skrabec@gmail.com,
        maarten.lankhorst@linux.intel.com, mripard@kernel.org,
        tzimmermann@suse.de, airlied@gmail.com, daniel@ffwll.ch,
        angelogioacchino.delregno@collabora.com, ulf.hansson@linaro.org,
        linus.walleij@linaro.org
Subject: [PATCH v2 0/2] drm/bridge: panel: Check device dependency before managing device link
Date:   Mon, 27 Nov 2023 13:14:12 +0800
Message-Id: <20231127051414.3783108-1-victor.liu@nxp.com>
Content-Transfer-Encoding: 8bit
Content-Type: text/plain
MIME-Version: 1.0
X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1
X-MS-Exchange-AntiSpam-MessageData-0: =?us-ascii?Q?S1YPmC6rO+kZujkFpkk5iIlS6/onAVQxHAHy+CWbrAD0Pl7m5I6oWKk6I2Sv?=
 =?us-ascii?Q?XIeRWxIM8eCvJ0gBvjsmE9qtgeKO1dV/SdV+EwO64QyUqa4Waw+B/36EoFuq?=
 =?us-ascii?Q?W5bnDnSgJgTZJp1GEtwZ3HLw4b7leNIDUBP+kq72YDGEbuJTYx9gy3RiKTvr?=
 =?us-ascii?Q?MPG/jehQM1aYI8uJEjRau4h2UsY/aCyn4AOlXuQ1PRhxH7rNxhiRZmQuvr3L?=
 =?us-ascii?Q?Y8zFxISvdCOQTh9pt7ciHufMTK9ua5qJfFLnhg0pOcdF6W3/U7xe8hkNjk2O?=
 =?us-ascii?Q?cDxIpKyBKEHSIGsh0yBvx7hLK2llHymRN33sgqis7w7WP5qrh2tNR8ZYLEDS?=
 =?us-ascii?Q?CUJ+xU2S+H2Bi+bf11wflmr37L/6rTc+YwkJtKc1msb7nKU3mCnZGUNmD3wT?=
 =?us-ascii?Q?ffLy16OhuKihLpL2PbEyACMWth94aOwHVh5e+fbQtAxbvF3wpcr71WBYEfhg?=
 =?us-ascii?Q?NUjWcth4+iLhEbvj9V26Hm37zs/5h3y8AIsm2pFjYjPFd63bauVmKzN0GQth?=
 =?us-ascii?Q?v3iiSBPS/BLXwg1D+1MgHr34EF0h9J3WHqIGosxxins9aXKhhbhrEqYkJBTU?=
 =?us-ascii?Q?pHyCfJxBtSO9O+72VPY606ycYq/yXBuyvz01Jvjn80pOFZQIY5SG/v2Glkq5?=
 =?us-ascii?Q?GEZUZCjYQj32Zr6jHcVQ7RT9/8H6PdX5DG5JbVCCHUi1t8ulT2jINaSRyzW/?=
 =?us-ascii?Q?CL8BDx4qtTqCyKkmTuuHuTz+T1F+qu0s7+q39jaFj2U5pZHF9N+bdsH8B3zV?=
 =?us-ascii?Q?VLfkqNfODhLyCG8wMLzInLSbM9G/afeQ5Gm5wmRFzh6+RXhyeAzyVQMq2A84?=
 =?us-ascii?Q?UQdJ3SQBj4n0UFjRSQBdNZZmJzEQoj8ZUS87iGx4m710UmsdT1pNjzsuKSiU?=
 =?us-ascii?Q?A85wD4HwKCb186D86ug4PiJIlUeso/r3q64RHUisou508PCTLmo1pUp6Yb/L?=
 =?us-ascii?Q?RBPh289s4+zzKv8jLwBSmHaxdgkx0kZggkx+fdzksCIH7tuBju1rwnMyEHHA?=
 =?us-ascii?Q?2gwJQkKZHn0JIffuSI5YORfTmSk3tflXruYYxwpOiSe59uBbcrp99ewU5V30?=
 =?us-ascii?Q?CXO4DfS2Yp3aZ9QLleKoUz6eYBK2hDQSxhQSj6Mm+RNycsW385u76L6Lin/f?=
 =?us-ascii?Q?juuEkQ/tnND9S6G//8PuCFgtVZrhpbrw3UH/aQE+2K7UATSn7ZWl1i2OFR0H?=
 =?us-ascii?Q?4fuosSe365BDjAzcpgcChdyG/bUFqMahoRSRAoseAdvE4ePqupgF29BV7ojD?=
 =?us-ascii?Q?l8pV7A7gsZMi5ImmEcYVKPsbt/Tw3tjkzeMPwzXtbWGwjh25PcFUzvCbi6vH?=
 =?us-ascii?Q?+E/zsOX9/qqexPD8/G8n4E9wgLSsSa+lKDPEUa4MxRILg1ewf123i1HWd7TU?=
 =?us-ascii?Q?2SOEGeZ6P1wa1aG59t4u/p1MVzpis9d4YxHnacDTnVBd438ievH2nsYbkUHx?=
 =?us-ascii?Q?G6Pzj7oeDtdbQaSh5M5jHCFoNVjhR1NcNWwiYKEkN1Y/jUXpf66F3z562FF4?=
 =?us-ascii?Q?pl54wfms55THY4KLujj6bvcceaAkavsXnka00Idc9qfvu0t8nAHqp08Nv9lk?=
 =?us-ascii?Q?LDdFW81Ety/fKCLtGEBGtV0NZ1zLAdk/cqj7DA4i?=
X-OriginatorOrg: nxp.com
X-MS-Exchange-CrossTenant-Network-Message-Id: 7131f90a-acd9-47fc-a03c-08dbef071b84
X-MS-Exchange-CrossTenant-AuthSource: AM7PR04MB7046.eurprd04.prod.outlook.com
X-MS-Exchange-CrossTenant-AuthAs: Internal
X-MS-Exchange-CrossTenant-OriginalArrivalTime: 27 Nov 2023 05:10:01.2251
 (UTC)
X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted
X-MS-Exchange-CrossTenant-Id: 686ea1d3-bc2b-4c6f-a92c-d99c5c301635
X-MS-Exchange-CrossTenant-MailboxType: HOSTED
X-MS-Exchange-CrossTenant-UserPrincipalName: eJtFp+gpMkl/IX4j6jHVZufeQplKwbFtGzKeHX2+jZiIpm+ajFGwGNFCx6RjtCAIdfmmlGQjFGn/FdQiIZINhw==
X-MS-Exchange-Transport-CrossTenantHeadersStamped: AM0PR04MB6961
X-Spam-Status: No, score=-0.9 required=5.0 tests=DKIM_SIGNED,DKIM_VALID,
	DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,
	SPF_HELO_NONE,SPF_PASS,T_SCC_BODY_TEXT_LINE autolearn=unavailable
	autolearn_force=no version=3.4.6
X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on groat.vger.email
Precedence: bulk
List-ID: <linux-kernel.vger.kernel.org>
X-Mailing-List: linux-kernel@vger.kernel.org
X-Greylist: Sender passed SPF test, not delayed by milter-greylist-4.6.4 (groat.vger.email [0.0.0.0]); Sun, 26 Nov 2023 21:10:15 -0800 (PST)

Hi,

This series aims to check panel device dependency upon DRM device before
managing device link between them.  It fixes eariler patches in v6.7-rc1
which tried to manage the link.  Without this series, the link fails to
be added for dependent panel devices and hence relevant panel bridges
fail to be attached.  A real broken panel is "novatek,nt35510" defined
in arch/arm/boot/dts/st/ste-ux500-samsung-skomer.dts as reported by
Linus Walleij.

Patch 1 exports device_is_dependent() to modules as needed by patch 2.
Patch 2 checks device dependency before managing the device link.

Note that patch 2 is already in drm-misc/drm-misc-fixes and
drm-misc/for-linux-next-fixes.  Patch 1 needs to be reviewed and picked up.

v2:
* Introduce patch 1 to export device_is_dependent() to modules as needed by
  patch 2.

Liu Ying (2):
  driver core: Export device_is_dependent() to modules
  drm/bridge: panel: Check device dependency before managing device link

 drivers/base/core.c            |  1 +
 drivers/gpu/drm/bridge/panel.c | 27 ++++++++++++++++++---------
 2 files changed, 19 insertions(+), 9 deletions(-)

-- 
2.37.1