linux-kernel - Re: [PATCH v3 0/2] iio: dac: adi-axi-dac: fix for wrong bus read

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Message-ID: <a0a926291e2975572cfc1499eef930b0c762591f.camel@gmail.com>
Date: Fri, 23 May 2025 14:36:50 +0100
From: Nuno Sá <noname.nuno@...il.com>
To: Angelo Dureghello <adureghello@...libre.com>, Lars-Peter Clausen	
 <lars@...afoo.de>, Michael Hennerich <Michael.Hennerich@...log.com>, Nuno
 Sa	 <nuno.sa@...log.com>, Jonathan Cameron <jic23@...nel.org>, David
 Lechner	 <dlechner@...libre.com>, Andy Shevchenko <andy@...nel.org>
Cc: Jonathan Cameron <Jonathan.Cameron@...wei.com>,
 linux-iio@...r.kernel.org, 	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 0/2] iio: dac: adi-axi-dac: fix for wrong bus read

On Fri, 2025-05-23 at 11:00 +0200, Angelo Dureghello wrote:
> This patchset is intended to fix a random wrong chip ID read, or a
> scratchpad test mismatch, tests done in the ad3552r-hs driver probe. The
> bus "read" operation must always check for busy flag before reading.
> 
> First patch fixes the wrong bus read occurence, second patch reorganizes
> a bit the busy-wait polling code.
> 
> NOTE: due to ongoing changes in adi-axi-dac.c, this patch is intended to be
> applied after the linked "ramp generator" patch.
> 
> Link:
> https://lore.kernel.org/linux-iio/20250408-wip-bl-ad3552r-fixes-v4-0-b33c0264bd78@baylibre.com
> Signed-off-by: Angelo Dureghello <adureghello@...libre.com>
> ---

Reviewed-by: Nuno Sá <nuno.sa@...log.com>

> Changes in v3:
> - fix axi_dac_wait_bus_free(), 0 must be checked on poll, not -1. Someway
>   failed testing it here initially.
> - Link to v2:
> https://lore.kernel.org/r/20250409-ad3552r-fix-bus-read-v2-0-34d3b21e8ca0@baylibre.com
> 
> Changes in v2:
> - invert patch order, fix first.
> - Link to v1:
> https://lore.kernel.org/r/20250408-ad3552r-fix-bus-read-v1-0-37add66aeb08@baylibre.com
> 
> ---
> Angelo Dureghello (2):
>       iio: dac: adi-axi-dac: fix bus read
>       iio: dac: adi-axi-dac: use unique bus free check
> 
>  drivers/iio/dac/adi-axi-dac.c | 40 +++++++++++++++++++++++++---------------
>  1 file changed, 25 insertions(+), 15 deletions(-)
> ---
> base-commit: 6fb85f14853ddde06d57030c753168402bf69cd9
> change-id: 20250408-ad3552r-fix-bus-read-1522622fbd2b
> 
> Best regards,