* [PATCH] Documentation: Note QDF2400 SoC Erratum 44 @ 2017-02-15 21:54 ` Christopher Covington 0 siblings, 0 replies; 4+ messages in thread From: Christopher Covington @ 2017-02-15 21:54 UTC (permalink / raw) To: linux-arm-kernel The Qualcomm Datacenter Technologies QDF2400 family of SoCs contains a custom (non-PrimeCell) implementation of the SBSA UART. Occasionally the BUSY bit in the Flag Register gets stuck as 1, erratum 44 for both 2432v1 and 2400v1 SoCs.Checking that the Transmit FIFO Empty (TXFE) bit is 0, instead of checking that the BUSY bit is 1, works around the issue. Note this in the customary location. To minimize conflicts, this documentation update is separate from the code changes, "tty: pl011: Work around QDF2400 E44 stuck BUSY bit". Signed-off-by: Christopher Covington <cov@codeaurora.org> Acked-by: Russell King <rmk+kernel@armlinux.org.uk> Acked-by: Mark Rutland <mark.rutland@arm.com> Acked-by: Timur Tabi <timur@codeaurora.org> --- Documentation to go with https://patchwork.kernel.org/patch/9575103/ Based on http://git.kernel.org/cgit/linux/kernel/git/arm64/linux.git/log/?h=for-next/core --- Documentation/arm64/silicon-errata.txt | 2 ++ 1 file changed, 2 insertions(+) diff --git a/Documentation/arm64/silicon-errata.txt b/Documentation/arm64/silicon-errata.txt index a71b8095dbd8..bc3d086bc624 100644 --- a/Documentation/arm64/silicon-errata.txt +++ b/Documentation/arm64/silicon-errata.txt @@ -68,3 +68,5 @@ stable kernels. | | | | | | Qualcomm Tech. | Falkor v1 | E1003 | QCOM_FALKOR_ERRATUM_1003 | | Qualcomm Tech. | Falkor v1 | E1009 | QCOM_FALKOR_ERRATUM_1009 | +| Qualcomm Tech. | QDF2432v1 UART | SoC E44 | N/A | +| Qualcomm Tech. | QDF2400v1 UART | SoC E44 | N/A | -- Qualcomm Datacenter Technologies, Inc. as an affiliate of Qualcomm Technologies, Inc. Qualcomm Technologies, Inc. is a member of the Code Aurora Forum, a Linux Foundation Collaborative Project. ^ permalink raw reply related [flat|nested] 4+ messages in thread
* [PATCH] Documentation: Note QDF2400 SoC Erratum 44 @ 2017-02-15 21:54 ` Christopher Covington 0 siblings, 0 replies; 4+ messages in thread From: Christopher Covington @ 2017-02-15 21:54 UTC (permalink / raw) To: Catalin Marinas, Will Deacon, Jonathan Corbet, linux-arm-kernel, linux-doc, linux-kernel Cc: Greg Kroah-Hartman, Marc Zyngier, Russell King, Mark Rutland, Peter Hurley, Aleksey Makarov, Robin Murphy, Shanker Donthineni, Timur Tabi, Mark Langsdorf, Mark Salter, Jon Masters, Neil Leeder, Steve Ulrich, Christopher Covington The Qualcomm Datacenter Technologies QDF2400 family of SoCs contains a custom (non-PrimeCell) implementation of the SBSA UART. Occasionally the BUSY bit in the Flag Register gets stuck as 1, erratum 44 for both 2432v1 and 2400v1 SoCs.Checking that the Transmit FIFO Empty (TXFE) bit is 0, instead of checking that the BUSY bit is 1, works around the issue. Note this in the customary location. To minimize conflicts, this documentation update is separate from the code changes, "tty: pl011: Work around QDF2400 E44 stuck BUSY bit". Signed-off-by: Christopher Covington <cov@codeaurora.org> Acked-by: Russell King <rmk+kernel@armlinux.org.uk> Acked-by: Mark Rutland <mark.rutland@arm.com> Acked-by: Timur Tabi <timur@codeaurora.org> --- Documentation to go with https://patchwork.kernel.org/patch/9575103/ Based on http://git.kernel.org/cgit/linux/kernel/git/arm64/linux.git/log/?h=for-next/core --- Documentation/arm64/silicon-errata.txt | 2 ++ 1 file changed, 2 insertions(+) diff --git a/Documentation/arm64/silicon-errata.txt b/Documentation/arm64/silicon-errata.txt index a71b8095dbd8..bc3d086bc624 100644 --- a/Documentation/arm64/silicon-errata.txt +++ b/Documentation/arm64/silicon-errata.txt @@ -68,3 +68,5 @@ stable kernels. | | | | | | Qualcomm Tech. | Falkor v1 | E1003 | QCOM_FALKOR_ERRATUM_1003 | | Qualcomm Tech. | Falkor v1 | E1009 | QCOM_FALKOR_ERRATUM_1009 | +| Qualcomm Tech. | QDF2432v1 UART | SoC E44 | N/A | +| Qualcomm Tech. | QDF2400v1 UART | SoC E44 | N/A | -- Qualcomm Datacenter Technologies, Inc. as an affiliate of Qualcomm Technologies, Inc. Qualcomm Technologies, Inc. is a member of the Code Aurora Forum, a Linux Foundation Collaborative Project. ^ permalink raw reply related [flat|nested] 4+ messages in thread
* [PATCH] Documentation: Note QDF2400 SoC Erratum 44 2017-02-15 21:54 ` Christopher Covington @ 2017-02-17 18:14 ` Will Deacon -1 siblings, 0 replies; 4+ messages in thread From: Will Deacon @ 2017-02-17 18:14 UTC (permalink / raw) To: linux-arm-kernel On Wed, Feb 15, 2017 at 04:54:07PM -0500, Christopher Covington wrote: > The Qualcomm Datacenter Technologies QDF2400 family of SoCs contains a > custom (non-PrimeCell) implementation of the SBSA UART. Occasionally the > BUSY bit in the Flag Register gets stuck as 1, erratum 44 for both 2432v1 > and 2400v1 SoCs.Checking that the Transmit FIFO Empty (TXFE) bit is 0, > instead of checking that the BUSY bit is 1, works around the issue. Note > this in the customary location. To minimize conflicts, this documentation > update is separate from the code changes, "tty: pl011: Work around QDF2400 > E44 stuck BUSY bit". > > Signed-off-by: Christopher Covington <cov@codeaurora.org> > Acked-by: Russell King <rmk+kernel@armlinux.org.uk> > Acked-by: Mark Rutland <mark.rutland@arm.com> > Acked-by: Timur Tabi <timur@codeaurora.org> > --- > Documentation to go with https://patchwork.kernel.org/patch/9575103/ Please poke me when that goes into -next. I don't want to merge the doc until the patch is queued too. Thanks, Will ^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: [PATCH] Documentation: Note QDF2400 SoC Erratum 44 @ 2017-02-17 18:14 ` Will Deacon 0 siblings, 0 replies; 4+ messages in thread From: Will Deacon @ 2017-02-17 18:14 UTC (permalink / raw) To: Christopher Covington Cc: Catalin Marinas, Jonathan Corbet, linux-arm-kernel, linux-doc, linux-kernel, Greg Kroah-Hartman, Marc Zyngier, Russell King, Mark Rutland, Peter Hurley, Aleksey Makarov, Robin Murphy, Shanker Donthineni, Timur Tabi, Mark Langsdorf, Mark Salter, Jon Masters, Neil Leeder, Steve Ulrich On Wed, Feb 15, 2017 at 04:54:07PM -0500, Christopher Covington wrote: > The Qualcomm Datacenter Technologies QDF2400 family of SoCs contains a > custom (non-PrimeCell) implementation of the SBSA UART. Occasionally the > BUSY bit in the Flag Register gets stuck as 1, erratum 44 for both 2432v1 > and 2400v1 SoCs.Checking that the Transmit FIFO Empty (TXFE) bit is 0, > instead of checking that the BUSY bit is 1, works around the issue. Note > this in the customary location. To minimize conflicts, this documentation > update is separate from the code changes, "tty: pl011: Work around QDF2400 > E44 stuck BUSY bit". > > Signed-off-by: Christopher Covington <cov@codeaurora.org> > Acked-by: Russell King <rmk+kernel@armlinux.org.uk> > Acked-by: Mark Rutland <mark.rutland@arm.com> > Acked-by: Timur Tabi <timur@codeaurora.org> > --- > Documentation to go with https://patchwork.kernel.org/patch/9575103/ Please poke me when that goes into -next. I don't want to merge the doc until the patch is queued too. Thanks, Will ^ permalink raw reply [flat|nested] 4+ messages in thread
end of thread, other threads:[~2017-02-17 18:23 UTC | newest] Thread overview: 4+ messages (download: mbox.gz follow: Atom feed -- links below jump to the message on this page -- 2017-02-15 21:54 [PATCH] Documentation: Note QDF2400 SoC Erratum 44 Christopher Covington 2017-02-15 21:54 ` Christopher Covington 2017-02-17 18:14 ` Will Deacon 2017-02-17 18:14 ` Will Deacon
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