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Message-ID: <7d16f013-7fdc-41f3-a966-973e8f5ccfdb@leemhuis.info>
Date: Tue, 23 Jan 2024 16:45:11 +0100
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Subject: Re: [PATCH v11 03/10] spi: Add multi-cs memories support in SPI core
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From: "Linux regression tracking #update (Thorsten Leemhuis)"
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To: Linux kernel regressions list <regressions@lists.linux.dev>
Cc: linux-kernel@vger.kernel.org, linux-sound@vger.kernel.org,
 linux-arm-kernel@lists.infradead.org, linux-spi@vger.kernel.org
Reply-To: Linux regressions mailing list <regressions@lists.linux.dev>,
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References: <20231125092137.2948-1-amit.kumar-mahapatra@amd.com>
 <20231125092137.2948-4-amit.kumar-mahapatra@amd.com>
 <3d3a11b1-8396-4d8e-9bb3-61ecb67e7efa@roeck-us.net>
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On 21.01.24 10:42, Linux regression tracking #adding (Thorsten Leemhuis)
wrote:
> On 12.01.24 20:11, Guenter Roeck wrote:
>>
>> On Sat, Nov 25, 2023 at 02:51:30PM +0530, Amit Kumar Mahapatra wrote:
>>> AMD-Xilinx GQSPI controller has two advanced mode that allows the
>>> controller to consider two flashes as one single device.
>>>
>>> One of these two mode is the parallel mode in which each byte of data is
>>> stored in both devices, the even bits in the lower flash & the odd bits in
>>> the upper flash. The byte split is automatically handled by the QSPI
>>> controller.
>> [...]
>> With this patch in the mainline kernel, two of my qemu emulations
>> (quanta-q71l-bmc and almetto-bmc) fail to instantiate the first SPI
>> controller and thus fail to boot from SPI. The error message is
>>
>> [    3.006458] spi_master spi0: No. of CS is more than max. no. of supported CS
>> [    3.006775] spi_master spi0: Failed to create SPI device for /ahb/spi@1e620000/flash@0
>>
>> The problem is no longer seen after reverting this patch.
>> [...]
>> # first bad commit: [4d8ff6b0991d5e86b17b235fc46ec62e9195cb9b] spi: Add multi-cs memories support in SPI core
> 
> Thanks for the report. To be sure the issue doesn't fall through the
> cracks unnoticed, I'm adding it to regzbot, the Linux kernel regression
> tracking bot:
> 
> #regzbot ^introduced 4d8ff6b0991d5e86b17b235fc46ec62e9195cb9
> #regzbot title spi: qemu emulations quanta-q71l-bmc and almetto-bmc fail
> to boot
> #regzbot ignore-activity

#regzbot fix: spi: Raise limit on number of chip selects
#regzbot ignore-activity

Ciao, Thorsten (wearing his 'the Linux kernel's regression tracker' hat)
--
Everything you wanna know about Linux kernel regression tracking:
https://linux-regtracking.leemhuis.info/about/#tldr
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