spi: dw: update NDF while using enhanced spi mode

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If the transfer of Transmit only mode is using enhanced SPI then
NDF needs to be updated with the number of data frames.
If the Transmit FIFO goes empty in-between, DWC_ssi masks the serial
clock and wait for rest of the data until the programmed amount of
frames are transferred successfully.
In receive mode, the number of data frames received is equal to this
register value plus 1.
In transmit mode, the number of data frames is equal this register
value.

Signed-off-by: Sudip Mukherjee <sudip.mukherjee@sifive.com>
Co-developed-by: Changhuang Liang <changhuang.liang@starfivetech.com>
Signed-off-by: Changhuang Liang <changhuang.liang@starfivetech.com>
Link: https://patch.msgid.link/20260803124044.156998-6-changhuang.liang@starfivetech.com
Signed-off-by: Mark Brown <broonie@kernel.org>

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Sudip Mukherjee 2026-08-03 05:40:38 -07:00 • committed by Mark Brown

parent 3d7fd27c97

commit 8678095362

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drivers/spi/spi-dw-core.c

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