From: Pavel Machek <pavel@ucw.cz>
To: pali.rohar@gmail.com, sre@kernel.org,
kernel list <linux-kernel@vger.kernel.org>,
linux-arm-kernel <linux-arm-kernel@lists.infradead.org>,
linux-omap@vger.kernel.org, tony@atomide.com, khilman@kernel.org,
aaro.koskinen@iki.fi, ivo.g.dimitrov.75@gmail.com,
patrikbachan@gmail.com, serge@hallyn.com, abcloriens@gmail.com,
clayton@craftyguy.net, martijn@brixit.nl,
sakari.ailus@linux.intel.com, wsa@the-dreams.de,
linux-i2c@vger.kernel.org, balbi@ti.com, jlu@pengutronix.de
Subject: i2c-omap.c vs. qemu: too much work in one irq (and broken boot)
Date: Sun, 1 Oct 2017 22:42:15 +0200 [thread overview]
Message-ID: <20171001204215.GA9928@amd> (raw)
[-- Attachment #1: Type: text/plain, Size: 2409 bytes --]
Hi!
I'm trying to get qemu emulation of Nokia N900 to work, but
unfortunately i2c-omap.c breaks boot in the emulator (real hardware
works ok).
[ 0.837524] omap2-onenand omap2-onenand: initializing on CS0, phys
base 0x01000000, virtual base d00c0000, freq 66 MHz
[ 0.838958] Muxed OneNAND 256MB 1.8V 16-bit (0x40)
[ 0.839752] OneNAND version = 0x0121
[ 0.842102] Scanning device for bad blocks
[ 1.012451] 6 ofpart partitions found on MTD device omap2-onenand
[ 1.013153] Creating 6 MTD partitions on "omap2-onenand":
[ 1.014007] 0x000000000000-0x000000020000 : "bootloader"
[ 1.018066] 0x000000020000-0x000000080000 : "config"
[ 1.020660] 0x000000080000-0x0000000c0000 : "log"
[ 1.022827] 0x0000000c0000-0x0000002c0000 : "kernel"
[ 1.025848] 0x0000002c0000-0x0000004c0000 : "initfs"
[ 1.028106] 0x0000004c0000-0x000010000000 : "rootfs"
[ 1.047668] omap_i2c 48070000.i2c: addr: 0x004b, len: 2, flags:
0x0, stop: 1
[ 1.048828] omap_i2c 48070000.i2c: IRQ (ISR = 0x0010)
[ 1.049530] omap_i2c 48070000.i2c: IRQ (ISR = 0x0010)
[ 1.050018] omap_i2c 48070000.i2c: IRQ (ISR = 0x0010)
[ 1.050476] omap_i2c 48070000.i2c: IRQ (ISR = 0x0010)
[ 1.050872] omap_i2c 48070000.i2c: IRQ (ISR = 0x0010)
[ 1.051422] omap_i2c 48070000.i2c: IRQ (ISR = 0x0010)
[ 1.052001] omap_i2c 48070000.i2c: IRQ (ISR = 0x0010)
[ 1.052398] omap_i2c 48070000.i2c: IRQ (ISR = 0x0010)
[ 1.052825] omap_i2c 48070000.i2c: IRQ (ISR = 0x0010)
[ 1.053222] omap_i2c 48070000.i2c: IRQ (ISR = 0x0010)
[ 1.053619] omap_i2c 48070000.i2c: IRQ (ISR = 0x0010)
[ 1.054016] omap_i2c 48070000.i2c: IRQ (ISR = 0x0010)
[ 1.054412] omap_i2c 48070000.i2c: IRQ (ISR = 0x0010)
[ 1.054840] omap_i2c 48070000.i2c: IRQ (ISR = 0x0010)
...
After 100 messages I get "Too much work in one IRQ" message, and then
repeat. I tried just disabling omap_i2c in the dts, but 1) its not
easy 2) I'd lose quite fundamental functionality.
Ideas welcome.
Best regards,
Pavel
PS: If anyone is interested, this is why working qemu would be useful:
https://wiki.postmarketos.org/wiki/Nokia_N900_(nokia-rx51) . There's a
lot of work to be done in the userspace, and swapping SD cards is kind
of slow.
--
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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WARNING: multiple messages have this Message-ID (diff)
From: pavel@ucw.cz (Pavel Machek)
To: linux-arm-kernel@lists.infradead.org
Subject: i2c-omap.c vs. qemu: too much work in one irq (and broken boot)
Date: Sun, 1 Oct 2017 22:42:15 +0200 [thread overview]
Message-ID: <20171001204215.GA9928@amd> (raw)
Hi!
I'm trying to get qemu emulation of Nokia N900 to work, but
unfortunately i2c-omap.c breaks boot in the emulator (real hardware
works ok).
[ 0.837524] omap2-onenand omap2-onenand: initializing on CS0, phys
base 0x01000000, virtual base d00c0000, freq 66 MHz
[ 0.838958] Muxed OneNAND 256MB 1.8V 16-bit (0x40)
[ 0.839752] OneNAND version = 0x0121
[ 0.842102] Scanning device for bad blocks
[ 1.012451] 6 ofpart partitions found on MTD device omap2-onenand
[ 1.013153] Creating 6 MTD partitions on "omap2-onenand":
[ 1.014007] 0x000000000000-0x000000020000 : "bootloader"
[ 1.018066] 0x000000020000-0x000000080000 : "config"
[ 1.020660] 0x000000080000-0x0000000c0000 : "log"
[ 1.022827] 0x0000000c0000-0x0000002c0000 : "kernel"
[ 1.025848] 0x0000002c0000-0x0000004c0000 : "initfs"
[ 1.028106] 0x0000004c0000-0x000010000000 : "rootfs"
[ 1.047668] omap_i2c 48070000.i2c: addr: 0x004b, len: 2, flags:
0x0, stop: 1
[ 1.048828] omap_i2c 48070000.i2c: IRQ (ISR = 0x0010)
[ 1.049530] omap_i2c 48070000.i2c: IRQ (ISR = 0x0010)
[ 1.050018] omap_i2c 48070000.i2c: IRQ (ISR = 0x0010)
[ 1.050476] omap_i2c 48070000.i2c: IRQ (ISR = 0x0010)
[ 1.050872] omap_i2c 48070000.i2c: IRQ (ISR = 0x0010)
[ 1.051422] omap_i2c 48070000.i2c: IRQ (ISR = 0x0010)
[ 1.052001] omap_i2c 48070000.i2c: IRQ (ISR = 0x0010)
[ 1.052398] omap_i2c 48070000.i2c: IRQ (ISR = 0x0010)
[ 1.052825] omap_i2c 48070000.i2c: IRQ (ISR = 0x0010)
[ 1.053222] omap_i2c 48070000.i2c: IRQ (ISR = 0x0010)
[ 1.053619] omap_i2c 48070000.i2c: IRQ (ISR = 0x0010)
[ 1.054016] omap_i2c 48070000.i2c: IRQ (ISR = 0x0010)
[ 1.054412] omap_i2c 48070000.i2c: IRQ (ISR = 0x0010)
[ 1.054840] omap_i2c 48070000.i2c: IRQ (ISR = 0x0010)
...
After 100 messages I get "Too much work in one IRQ" message, and then
repeat. I tried just disabling omap_i2c in the dts, but 1) its not
easy 2) I'd lose quite fundamental functionality.
Ideas welcome.
Best regards,
Pavel
PS: If anyone is interested, this is why working qemu would be useful:
https://wiki.postmarketos.org/wiki/Nokia_N900_(nokia-rx51) . There's a
lot of work to be done in the userspace, and swapping SD cards is kind
of slow.
--
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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next reply other threads:[~2017-10-01 20:42 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-10-01 20:42 Pavel Machek [this message]
2017-10-01 20:42 ` i2c-omap.c vs. qemu: too much work in one irq (and broken boot) Pavel Machek
2017-10-01 22:19 ` Pavel Machek
2017-10-01 22:19 ` Pavel Machek
2017-10-02 7:23 ` Pali Rohár
2017-10-02 7:23 ` Pali Rohár
2017-10-03 9:38 ` Pavel Machek
2017-10-03 9:38 ` Pavel Machek
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