spi: microchip-core-qspi: don't attempt to transmit during emulated read-only dual/quad operations

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The core will deal with reads by creating clock cycles itself, there's
no need to generate clock cycles by transmitting garbage data at the
driver level. Further, transmitting garbage data just bricks the transfer
since QSPI doesn't have a dedicated master-out line like MOSI in regular
SPI. I'm not entirely sure if the transfer is bricked because of the
garbage data being transmitted on the bus or because the core loses
track of whether it is supposed to be sending or receiving data.

Fixes: 8f9cf02c88 ("spi: microchip-core-qspi: Add regular transfers")
CC: stable@vger.kernel.org
Signed-off-by: Conor Dooley <conor.dooley@microchip.com>
Link: https://patch.msgid.link/20260430-freezing-saloon-95b1f3d9dad0@spud
Signed-off-by: Mark Brown <broonie@kernel.org>

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Conor Dooley 2026-04-30 11:10:19 +01:00 • committed by Mark Brown

parent 7672749e14

commit eb56deaabf

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drivers/spi/spi-microchip-core-qspi.c

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