linux-kernel - Re: [PATCH v5 3/3] spi: tegra210-quad: Check hardware status on timeout

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Message-ID: <wo3oezxxxqbld326h7736lzyspgk7odvvvcamgp5wemtxsnzee@ybl3kg54arvy>
Date: Mon, 3 Nov 2025 15:16:46 +0100
From: Thierry Reding <thierry.reding@...il.com>
To: Vishwaroop A <va@...dia.com>
Cc: Mark Brown <broonie@...nel.org>, 
	Jonathan Hunter <jonathanh@...dia.com>, Sowjanya Komatineni <skomatineni@...dia.com>, 
	Laxman Dewangan <ldewangan@...dia.com>, smangipudi@...dia.com, kyarlagadda@...dia.com, 
	linux-spi@...r.kernel.org, linux-tegra@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v5 3/3] spi: tegra210-quad: Check hardware status on
 timeout

On Tue, Oct 28, 2025 at 03:57:03PM +0000, Vishwaroop A wrote:
> Under high system load, QSPI interrupts can be delayed or blocked on the
> target CPU, causing wait_for_completion_timeout() to report failure even
> though the hardware successfully completed the transfer.
> 
> When a timeout occurs, check the QSPI_RDY bit in QSPI_TRANS_STATUS to
> determine if the hardware actually completed the transfer. If so, manually
> invoke the completion handler to process the transfer successfully instead
> of failing it.
> 
> This distinguishes lost/delayed interrupts from real hardware timeouts,
> preventing unnecessary failures of transfers that completed successfully.
> 
> Signed-off-by: Vishwaroop A <va@...dia.com>
> ---
>  drivers/spi/spi-tegra210-quad.c | 100 +++++++++++++++++++++++++-------
>  1 file changed, 80 insertions(+), 20 deletions(-)

Acked-by: Thierry Reding <treding@...dia.com>

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