On Tue, 2024-07-23 at 13:36 -0500, David Lechner wrote: > This adds a check on xfer->len to avoid emitting an XFER_BITS > instruction for empty transfers in the AXI SPI Engine driver. This > avoids unnecessary delays caused by executing an instruction that has > no effect on the actual SPI transfer. > > Signed-off-by: David Lechner <dlechner@xxxxxxxxxxxx> > --- Reviewed-by: Nuno Sa <nuno.sa@xxxxxxxxxx>
Re: [PATCH] spi: axi-spi-engine: don't emit XFER_BITS for empty xfer
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- Subject: Re: [PATCH] spi: axi-spi-engine: don't emit XFER_BITS for empty xfer
- From: Nuno Sá <noname.nuno@xxxxxxxxx>
- Date: Wed, 24 Jul 2024 09:45:59 +0200
- Cc: Michael Hennerich <michael.hennerich@xxxxxxxxxx>, Nuno Sá <nuno.sa@xxxxxxxxxx>, linux-spi@xxxxxxxxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx
- In-reply-to: <20240723-spi-axi-spi-engine-opt-bpw-v1-1-2625ba4c4387@baylibre.com>
- References: <20240723-spi-axi-spi-engine-opt-bpw-v1-1-2625ba4c4387@baylibre.com>
- User-agent: Evolution 3.52.2 (3.52.2-1.fc40)
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- [PATCH] spi: axi-spi-engine: don't emit XFER_BITS for empty xfer
- From: David Lechner
- [PATCH] spi: axi-spi-engine: don't emit XFER_BITS for empty xfer
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