Vincent Whitchurch c202ad048f spi: s3c64xx: Fix large transfers with DMA
[ Upstream commit 1224e29572f655facfcd850cf0f0a4784f36a903 ]

The COUNT_VALUE in the PACKET_CNT register is 16-bit so the maximum
value is 65535.  Asking the driver to transfer a larger size currently
leads to the DMA transfer timing out.  Implement ->max_transfer_size()
and have the core split the transfer as needed.

Fixes: 230d42d422e7 ("spi: Add s3c64xx SPI Controller driver")
Signed-off-by: Vincent Whitchurch <vincent.whitchurch@axis.com>
Link: https://lore.kernel.org/r/20220927112117.77599-5-vincent.whitchurch@axis.com
Signed-off-by: Mark Brown <broonie@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
2022-10-26 13:22:25 +02:00
..
2019-09-16 15:52:38 -07:00
2022-04-15 14:17:59 +02:00
2020-08-19 08:16:25 +02:00