tree a1d814014404a2ae2d9f6fa530b0a9316f4d4271
parent 96db8b65da93eaa476a1704cbaee51604fee2a99
author Ashok Reddy Soma <ashok.reddy.soma@amd.com> 1661432344 -0600
committer Michal Simek <michal.simek@amd.com> 1663061568 +0200

spi: zynqmp_gqspi: Fix issue of reading more than 32bits length

As the flash sizes are increasing day by day, QSPI can have devices of
size > 512MB. In qspi driver we are trying to read all the data at once
using DMA.

The DMA descriptor destination size is only 29bits long.

QSPIDMA_DST_SIZE 0xFF0F0804

BITS:  1:0      Reserved to keep word alignment
BITS: 28:2      Number of 4-byte words the DMA will transfer
BITS: 31:29     Reserved: Returns 0 when read, writes ignored

So we can only transfer data of 0x1FFFFFF0(512MB minus 4bytes) bytes.
Anything above will overflow this register and will ignore higher bits
above 29 bits.

Change the DMA functionality if the requested size is greater than or
equal to 512MB to read 256MB chunks.

Signed-off-by: Ashok Reddy Soma <ashok.reddy.soma@amd.com>
Link: https://lore.kernel.org/r/20220825125906.11581-5-ashok.reddy.soma@amd.com
Signed-off-by: Michal Simek <michal.simek@amd.com>