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Thu, 08 Jan 2026 01:12:55 -0800 (PST) Message-ID: Date: Thu, 8 Jan 2026 11:12:54 +0200 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [BUG] drm/panel: ilitek-ili9881c: kernel panic on reboot To: Hugo Villeneuve , dri-devel@lists.freedesktop.org Cc: linux-renesas-soc@vger.kernel.org, linux-clk@vger.kernel.org, linux-kernel@vger.kernel.org, Claudiu Beznea , Neil Armstrong , Jessica Zhang , Maarten Lankhorst , Maxime Ripard , Thomas Zimmermann , David Airlie , Simona Vetter , Biju Das Biju Das , Chris Brandt References: <20260107164839.a490a194d975edc399d72d01@hugovil.com> Content-Language: en-US From: Claudiu Beznea In-Reply-To: <20260107164839.a490a194d975edc399d72d01@hugovil.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Hi, Hugo, On 1/7/26 23:48, Hugo Villeneuve wrote: > Hi, > when issuing a reboot command, I encounter the following kernel panic: > > [ 36.183478] SError Interrupt on CPU1, code 0x00000000be000011 -- SError > [ 36.183492] CPU: 1 UID: 0 PID: 1 Comm: systemd-shutdow Tainted: G M 6.19.0-rc4-arm64-renesas-00019-g067a81578add #62 NONE > [ 36.183504] Tainted: [M]=MACHINE_CHECK > [ 36.183507] Hardware name: Gecko ECO2 nxtpad (DT) > [ 36.183512] pstate: 80400005 (Nzcv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--) > [ 36.183519] pc : rzg2l_mipi_dsi_host_transfer+0x114/0x458 > [ 36.183538] lr : rzg2l_mipi_dsi_host_transfer+0x98/0x458 > [ 36.183547] sp : ffff8000813db860 > [ 36.183550] x29: ffff8000813db890 x28: ffff800080c602c0 x27: ffff000009dd7450 > [ 36.183563] x26: ffff800080c5fcc0 x25: ffff000009dd7450 x24: ffff800080e1f7a8 > [ 36.183573] x23: ffff000009dd7400 x22: 0000000000000000 x21: ffff000009dd7430 > [ 36.183582] x20: ffff8000813db8e8 x19: 0000000002050028 x18: 00000000ffffffff > [ 36.183592] x17: 0000000000000000 x16: 0000000000000000 x15: ffff8000813db220 > [ 36.183602] x14: 0000000000000000 x13: ffff800081255bc0 x12: 00000000000009a2 > [ 36.183611] x11: 0000000000000336 x10: ffff8000812b28d0 x9 : ffff800081255bc0 > [ 36.183621] x8 : ffff800081399000 x7 : ffff00000a042600 x6 : 0000000000000000 > [ 36.183631] x5 : 0000000000000805 x4 : 0000000002000000 x3 : 0000000000000028 > [ 36.183640] x2 : 0000000049627000 x1 : ffff800080c60b40 x0 : ffff800081780000 > [ 36.183652] Kernel panic - not syncing: Asynchronous SError Interrupt > [ 36.183657] CPU: 1 UID: 0 PID: 1 Comm: systemd-shutdow Tainted: G M 6.19.0-rc4-arm64-renesas-00019-g067a81578add #62 NONE > [ 36.183665] Tainted: [M]=MACHINE_CHECK > [ 36.183668] Hardware name: devboard1 (DT) > [ 36.183672] Call trace: > [ 36.183675] show_stack+0x18/0x24 (C) > [ 36.183692] dump_stack_lvl+0x34/0x8c > [ 36.183702] dump_stack+0x18/0x24 > [ 36.183708] vpanic+0x314/0x35c > [ 36.183716] nmi_panic+0x0/0x64 > [ 36.183722] add_taint+0x0/0xbc > [ 36.183728] arm64_serror_panic+0x70/0x80 > [ 36.183735] do_serror+0x28/0x68 > [ 36.183742] el1h_64_error_handler+0x34/0x50 > [ 36.183751] el1h_64_error+0x6c/0x70 > [ 36.183758] rzg2l_mipi_dsi_host_transfer+0x114/0x458 (P) > [ 36.183770] mipi_dsi_device_transfer+0x44/0x58 > [ 36.183781] mipi_dsi_dcs_set_display_off_multi+0x9c/0xc4 > [ 36.183792] ili9881c_unprepare+0x38/0x88 > [ 36.183802] drm_panel_unprepare+0xbc/0x108 > [ 36.183814] panel_bridge_atomic_post_disable+0x50/0x60 > [ 36.183823] drm_atomic_bridge_call_post_disable+0x24/0x4c > [ 36.183835] drm_atomic_bridge_chain_post_disable+0xa8/0x100 > [ 36.183845] drm_atomic_helper_commit_modeset_disables+0x2fc/0x5f8 > [ 36.183856] drm_atomic_helper_commit_tail_rpm+0x24/0x7c > [ 36.183865] commit_tail+0xa4/0x18c > [ 36.183874] drm_atomic_helper_commit+0x17c/0x194 > [ 36.183884] drm_atomic_commit+0x8c/0xcc > [ 36.183892] drm_atomic_helper_disable_all+0x200/0x210 > [ 36.183901] drm_atomic_helper_shutdown+0xa8/0x150 > [ 36.183911] rzg2l_du_shutdown+0x18/0x24 > [ 36.183920] platform_shutdown+0x24/0x34 > [ 36.183931] device_shutdown+0x128/0x284 > [ 36.183938] kernel_restart+0x44/0xa4 > [ 36.183950] __do_sys_reboot+0x178/0x270 > [ 36.183959] __arm64_sys_reboot+0x24/0x30 > [ 36.183968] invoke_syscall.constprop.0+0x50/0xe4 > [ 36.183979] do_el0_svc+0x40/0xc0 > [ 36.183988] el0_svc+0x3c/0x164 > [ 36.183995] el0t_64_sync_handler+0xa0/0xe4 > [ 36.184002] el0t_64_sync+0x198/0x19c > [ 36.184020] Kernel Offset: disabled > [ 36.184022] CPU features: 0x200000,00020001,4000c501,0400720b > [ 36.184028] Memory Limit: none > [ 36.495305] ---[ end Kernel panic - not syncing: Asynchronous SError Interrupt ]--- > > The problem is present since linux-6.18-rc1, but not in linux-6.17. I also confirm the bug is present in linux-6.19-rc4. > > The bug seems to be happening in rzg2l_mipi_dsi_host_transfer(). > > After bisecting, here is the first bad commit: > > commit 56de5e305d4b ("clk: renesas: r9a07g044: Add MSTOP for RZ/G2L") > > Reverting this change makes the bug disappear. > > My limited understanding seems to indicate that the MIPI/DSI host may > no longer be available/on when the panel tries to send MIPI/DSI > commands in ili9881c_unprepare(), maybe because the MIPI/DSI clock has been stopped... > > The exact same board with two other panels (jd9365da and st7703) doesn't have the bug. Could you please provide the output of command: cat /sys/kernel/debug/mstop for both cases? Also, could you please check if the following diff solves your problem: diff --git a/drivers/gpu/drm/renesas/rz-du/rzg2l_mipi_dsi.c b/drivers/gpu/drm/renesas/rz-du/rzg2l_mipi_dsi.c index 5edd45424562..62957632a96f 100644 --- a/drivers/gpu/drm/renesas/rz-du/rzg2l_mipi_dsi.c +++ b/drivers/gpu/drm/renesas/rz-du/rzg2l_mipi_dsi.c @@ -1282,6 +1282,10 @@ static ssize_t rzg2l_mipi_dsi_host_transfer(struct mipi_dsi_host *host, value |= SQCH0DSC0AR_FMT_SHORT; } + ret = pm_runtime_resume_and_get(dsi->dev); + if (ret) + return ret; + rzg2l_mipi_dsi_link_write(dsi, SQCH0DSC0AR, value); /* @@ -1322,6 +1326,8 @@ static ssize_t rzg2l_mipi_dsi_host_transfer(struct mipi_dsi_host *host, ret = packet.payload_length; } + pm_runtime_put(dsi->dev); + return ret; } Thank you, Claudiu