Re: next/pending-fixes bisection: baseline.login on mt8173-elm-hana

[Mark Brown <broonie@kernel.org>]

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On Mon, May 09, 2022 at 09:12:51AM -0700, KernelCI bot wrote:

The KernelCI bisection bot found a boot regression on mt8173-elm-hana
which bisected to 6f81fdded0d02 ("serial: 8250_mtk: Make sure to select
the right FEATURE_SEL").  With the patch the output terminates at:

<6>[    0.763969] EINJ: ACPI disabled.
<6>[    0.789312] Serial: 8250/16550 driver, 4 ports, IRQ sharing enabled
<6>[    0.798321] printk: console [ttyS0] disabled
<6>[    0.823022] 11002000.serial: ttyS0 at MMIO 0x11002000 (irq = 251, base_baud = 1625000) is a 16550A

with a stream of ^@s following.

I've included the full bisection report, including links to more info
like full logs and a Reported-by tag from the bot below:

> * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
> * This automated bisection report was sent to you on the basis  *
> * that you may be involved with the breaking commit it has      *
> * found.  No manual investigation has been done to verify it,   *
> * and the root cause of the problem may be somewhere else.      *
> *                                                               *
> * If you do send a fix, please include this trailer:            *
> *   Reported-by: "kernelci.org bot" <bot@kernelci.org>          *
> *                                                               *
> * Hope this helps!                                              *
> * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *

> next/pending-fixes bisection: baseline.login on mt8173-elm-hana
> 
> Summary:
>   Start:      a42b168a3ce2c Merge branch 'for-linux-next-fixes' of git://anongit.freedesktop.org/drm/drm-misc
>   Plain log:  https://storage.kernelci.org/next/pending-fixes/v5.18-rc6-166-ga42b168a3ce2/arm64/defconfig+arm64-chromebook/gcc-10/lab-collabora/baseline-mt8173-elm-hana.txt
>   HTML log:   https://storage.kernelci.org/next/pending-fixes/v5.18-rc6-166-ga42b168a3ce2/arm64/defconfig+arm64-chromebook/gcc-10/lab-collabora/baseline-mt8173-elm-hana.html
>   Result:     6f81fdded0d02 serial: 8250_mtk: Make sure to select the right FEATURE_SEL
> 
> Checks:
>   revert:     PASS
>   verify:     PASS
> 
> Parameters:
>   Tree:       next
>   URL:        https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git
>   Branch:     pending-fixes
>   Target:     mt8173-elm-hana
>   CPU arch:   arm64
>   Lab:        lab-collabora
>   Compiler:   gcc-10
>   Config:     defconfig+arm64-chromebook
>   Test case:  baseline.login
> 
> Breaking commit found:
> 
> -------------------------------------------------------------------------------
> commit 6f81fdded0d024c7d4084d434764f30bca1cd6b1
> Author: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
> Date:   Wed Apr 27 15:23:27 2022 +0200
> 
>     serial: 8250_mtk: Make sure to select the right FEATURE_SEL
>     
>     Set the FEATURE_SEL at probe time to make sure that BIT(0) is enabled:
>     this guarantees that when the port is configured as AP UART, the
>     right register layout is interpreted by the UART IP.
>     
>     Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
>     Cc: stable <stable@vger.kernel.org>
>     Link: https://lore.kernel.org/r/20220427132328.228297-3-angelogioacchino.delregno@collabora.com
>     Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
> 
> diff --git a/drivers/tty/serial/8250/8250_mtk.c b/drivers/tty/serial/8250/8250_mtk.c
> index cd62a5f340149..28e36459642ce 100644
> --- a/drivers/tty/serial/8250/8250_mtk.c
> +++ b/drivers/tty/serial/8250/8250_mtk.c
> @@ -54,6 +54,9 @@
>  #define MTK_UART_TX_TRIGGER	1
>  #define MTK_UART_RX_TRIGGER	MTK_UART_RX_SIZE
>  
> +#define MTK_UART_FEATURE_SEL	39	/* Feature Selection register */
> +#define MTK_UART_FEAT_NEWRMAP	BIT(0)	/* Use new register map */
> +
>  #ifdef CONFIG_SERIAL_8250_DMA
>  enum dma_rx_status {
>  	DMA_RX_START = 0,
> @@ -569,6 +572,10 @@ static int mtk8250_probe(struct platform_device *pdev)
>  		uart.dma = data->dma;
>  #endif
>  
> +	/* Set AP UART new register map */
> +	writel(MTK_UART_FEAT_NEWRMAP, uart.port.membase +
> +	       (MTK_UART_FEATURE_SEL << uart.port.regshift));
> +
>  	/* Disable Rate Fix function */
>  	writel(0x0, uart.port.membase +
>  			(MTK_UART_RATE_FIX << uart.port.regshift));
> -------------------------------------------------------------------------------
> 
> 
> Git bisection log:
> 
> -------------------------------------------------------------------------------
> git bisect start
> # good: [c5eb0a61238dd6faf37f58c9ce61c9980aaffd7a] Linux 5.18-rc6
> git bisect good c5eb0a61238dd6faf37f58c9ce61c9980aaffd7a
> # bad: [a42b168a3ce2c4923d405814c81ef015aa5e6515] Merge branch 'for-linux-next-fixes' of git://anongit.freedesktop.org/drm/drm-misc
> git bisect bad a42b168a3ce2c4923d405814c81ef015aa5e6515
> # bad: [d424caf55dd6da1f39787899d223b17b61bff74e] Merge branch 'tty-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty.git
> git bisect bad d424caf55dd6da1f39787899d223b17b61bff74e
> # good: [2ecea400e96eddd79295a717ce9a7ef71d9519c0] Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net.git
> git bisect good 2ecea400e96eddd79295a717ce9a7ef71d9519c0
> # good: [493e389da29b9df4898136e487b7217b277a0d2f] Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/broonie/sound.git
> git bisect good 493e389da29b9df4898136e487b7217b277a0d2f
> # good: [4e02910ec7a8c7d7608dd3d18169f92d04e40eac] Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/helgaas/pci.git
> git bisect good 4e02910ec7a8c7d7608dd3d18169f92d04e40eac
> # bad: [edd5f60c340086891fab094ad61270d6c80f9ca4] tty: n_gsm: fix mux activation issues in gsm_config()
> git bisect bad edd5f60c340086891fab094ad61270d6c80f9ca4
> # bad: [6f81fdded0d024c7d4084d434764f30bca1cd6b1] serial: 8250_mtk: Make sure to select the right FEATURE_SEL
> git bisect bad 6f81fdded0d024c7d4084d434764f30bca1cd6b1
> # good: [bb0b197aadd928f52ce6f01f0ee977f0a08cf1be] serial: 8250_mtk: Fix UART_EFR register address
> git bisect good bb0b197aadd928f52ce6f01f0ee977f0a08cf1be
> # first bad commit: [6f81fdded0d024c7d4084d434764f30bca1cd6b1] serial: 8250_mtk: Make sure to select the right FEATURE_SEL
> -------------------------------------------------------------------------------
> 
> 
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