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From:   Frank Wunderlich <frank-w@public-files.de>
To:     linux-kernel@vger.kernel.org, linux-mediatek@lists.infradead.org
Cc:     Matthias Brugger <matthias.bgg@gmail.com>,
        Ryder Lee <ryder.lee@mediatek.com>,
        Chunfeng Yun <chunfeng.yun@mediatek.com>,
        Sean Wang <sean.wang@mediatek.com>
Subject: [BUG] 5.9-rc1 broken bootup on mt7622/mt7623
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Date:   Mon, 17 Aug 2020 16:47:09 +0200
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Hi

at least my Bananapi R2/R64 does not bootup (no output on serial console) =
with 5.9-rc1

made a bisect which points me to this commit:

commit f97dbf48ca43009e8b8bcdf07f47fc9f06149b36
Author: Saravana Kannan <saravanak@google.com>
Date:   Fri Jul 17 17:06:36 2020 -0700

    irqchip/mtk-sysirq: Convert to a platform driver

    This driver can work as a platform driver. So covert it to a platform
    driver.

    Signed-off-by: Saravana Kannan <saravanak@google.com>
    Signed-off-by: Marc Zyngier <maz@kernel.org>
    Reviewed-by: Hanks Chen <hanks.chen@mediatek.com>
    Link: https://lore.kernel.org/r/20200718000637.3632841-4-saravanak@goo=
gle.com

 drivers/irqchip/irq-mtk-sysirq.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

at least on my devices i got 5.9 working by reverting the commit, will sen=
d a revert-Patch

$ git bisect log
git bisect start
# bad: [d24b5abc4640b46bb356bb5371d244866a5fe0a3] gitignore: add from 5.8 =
+ itb/mod
git bisect bad d24b5abc4640b46bb356bb5371d244866a5fe0a3
# good: [bcf876870b95592b52519ed4aafcf9d95999bc9c] Linux 5.8
git bisect good bcf876870b95592b52519ed4aafcf9d95999bc9c
# bad: [8186749621ed6b8fc42644c399e8c755a2b6f630] Merge tag 'drm-next-2020=
-08-06' of git://anongit.freedesktop.org/drm/drm
git bisect bad 8186749621ed6b8fc42644c399e8c755a2b6f630
# bad: [2324d50d051ec0f14a548e78554fb02513d6dcef] Merge tag 'docs-5.9' of =
git://git.lwn.net/linux
git bisect bad 2324d50d051ec0f14a548e78554fb02513d6dcef
# good: [92c59e126b21fd212195358a0d296e787e444087] Merge tag 'arm-defconfi=
g-5.9' of git://git.kernel.org/pub/scm/linux/kernel/git/soc/soc
git bisect good 92c59e126b21fd212195358a0d296e787e444087
# good: [d4db4e553249eda9016fab2e363c26e52c47926f] Merge tag 'arm-newsoc-5=
.9' of git://git.kernel.org/pub/scm/linux/kernel/git/soc/soc
git bisect good d4db4e553249eda9016fab2e363c26e52c47926f
# good: [fd76a74d940ae3d6b8b2395cd12914630c7e1739] Merge tag 'audit-pr-202=
00803' of git://git.kernel.org/pub/scm/linux/kernel/git/pcmoore/audit
git bisect good fd76a74d940ae3d6b8b2395cd12914630c7e1739
# bad: [95ffa676583b23baed40861d30b65fe31397da00] Merge branch 'parisc-5.9=
-1' of git://git.kernel.org/pub/scm/linux/kernel/git/deller/parisc-linux
git bisect bad 95ffa676583b23baed40861d30b65fe31397da00
# bad: [f8b036a7fc231fe6e8297daddee5dffdbbf2581f] Merge tag 'irq-core-2020=
-08-04' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
git bisect bad f8b036a7fc231fe6e8297daddee5dffdbbf2581f
# good: [4f30a60aa78410496e5ffe632a371c00f0d83a8d] Merge tag 'close-range-=
v5.9' of git://git.kernel.org/pub/scm/linux/kernel/git/brauner/linux
git bisect good 4f30a60aa78410496e5ffe632a371c00f0d83a8d
# good: [8d16f5b979660c0fdcfa21a418cc03f1fde60cf7] genirq: Export irq_chip=
_retrigger_hierarchy and irq_chip_set_vcpu_affinity_parent
git bisect good 8d16f5b979660c0fdcfa21a418cc03f1fde60cf7
# bad: [c9c73a05413ea4a465cae1cb3593b01b190a233f] irqchip/loongson-liointc=
: Fix misuse of gc->mask_cache
git bisect bad c9c73a05413ea4a465cae1cb3593b01b190a233f
# bad: [f97dbf48ca43009e8b8bcdf07f47fc9f06149b36] irqchip/mtk-sysirq: Conv=
ert to a platform driver
git bisect bad f97dbf48ca43009e8b8bcdf07f47fc9f06149b36
# bad: [f97dbf48ca43009e8b8bcdf07f47fc9f06149b36] irqchip/mtk-sysirq: Conv=
ert to a platform driver
git bisect bad f97dbf48ca43009e8b8bcdf07f47fc9f06149b36 //needs change fro=
m 762a21fd45e0 as build-fix
# good: [3af9571cd585efafc2facbd8dbd407317ff898cf] irqchip/gic-v4.1: Ensur=
e accessing the correct RD when writing INVALLR
git bisect good 3af9571cd585efafc2facbd8dbd407317ff898cf
# good: [f8410e626569324cfe831aaecc0504cafc12b471] irqchip: Add IRQCHIP_PL=
ATFORM_DRIVER_BEGIN/END and IRQCHIP_MATCH helper macros
git bisect good f8410e626569324cfe831aaecc0504cafc12b471
# good: [5be57099d44550d2c4cf44a86c44df87edb79a57] irqchip/qcom-pdc: Switc=
h to using IRQCHIP_PLATFORM_DRIVER helper macros
git bisect good 5be57099d44550d2c4cf44a86c44df87edb79a57
# first bad commit: [f97dbf48ca43009e8b8bcdf07f47fc9f06149b36] irqchip/mtk=
-sysirq: Convert to a platform driver

regards Frank