diff mbox

Documentation: Note QDF2400 SoC Erratum 44

Message ID 20170215215407.25854-1-cov@codeaurora.org (mailing list archive)
State New, archived
Headers show

Commit Message

Christopher Covington Feb. 15, 2017, 9:54 p.m. UTC 
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(+)

Comments

Will Deacon Feb. 17, 2017, 6:14 p.m. UTC | #1 
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
diff mbox

Patch

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                         |