linux-kernel - Re: [PATCH v3 2/3] ARM: bcm2835: Switch to use %ptT

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Date:   Tue, 16 Jun 2020 19:13:46 +0300
From:   Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To:     Nicolas Saenz Julienne <nsaenzjulienne@...e.de>
Cc:     Petr Mladek <pmladek@...e.com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Sergey Senozhatsky <sergey.senozhatsky@...il.com>,
        linux-kernel@...r.kernel.org,
        Rasmus Villemoes <linux@...musvillemoes.dk>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Stefan Wahren <wahrenst@....net>
Subject: Re: [PATCH v3 2/3] ARM: bcm2835: Switch to use %ptT

On Tue, Jun 16, 2020 at 05:53:23PM +0200, Nicolas Saenz Julienne wrote:
> On Wed, 2020-04-15 at 20:00 +0300, Andy Shevchenko wrote:
> > Use %ptT instead of open coded variant to print content of
> > time64_t type in human readable format.
> > 
> > Signed-off-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
> > ---
> 
> as originally reported by Stefan Wahren, this patch is likely to be the cause
> for a regression on RPi3b+ 32bit mode (multi_v7_defconfig,
> 5.8.0-rc1-00019-ga5dc8300df75):
> 
> [    3.759892] raspberrypi-firmware soc:firmware: Attached to firmware from 18446744073709048425-02-19T15:52:16
> 
> Whereas the same doesn't seem to happen in 64bit mode:
> 
> [    1.584126] raspberrypi-firmware soc:firmware: Attached to firmware from 2020-02-12T12:39:27

Had you chance to run test_printf on that machine and see if it reports any failure?
If no, can you provide a raw date which makes this happen?

Ah, I think I have an idea what is going on... stay tuned!

Does below fix it?

--- a/drivers/firmware/raspberrypi.c
+++ b/drivers/firmware/raspberrypi.c
@@ -181,6 +181,7 @@ EXPORT_SYMBOL_GPL(rpi_firmware_property);
 static void
 rpi_firmware_print_firmware_revision(struct rpi_firmware *fw)
 {
+	time64_t date_and_time;
 	u32 packet;
 	int ret = rpi_firmware_property(fw,
 					RPI_FIRMWARE_GET_FIRMWARE_REVISION,
@@ -189,7 +190,8 @@ rpi_firmware_print_firmware_revision(struct rpi_firmware *fw)
 	if (ret)
 		return;
 
-	dev_info(fw->cl.dev, "Attached to firmware from %ptT\n", &packet);
+	date_and_time = packet;
+	dev_info(fw->cl.dev, "Attached to firmware from %ptT\n", &date_and_time);
 }

-- 
With Best Regards,
Andy Shevchenko