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spi: spi_amd: Remove read{q,b} usage on DMA buffer

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Add changes to replace the usage of read{q,b} MMIO accessors with direct
memory copy logic for reading data from DMA buffer.

Co-developed-by: Krishnamoorthi M <krishnamoorthi.m@amd.com>
Signed-off-by: Krishnamoorthi M <krishnamoorthi.m@amd.com>
Signed-off-by: Raju Rangoju <Raju.Rangoju@amd.com>
Link: https://patch.msgid.link/20250516100658.585654-2-Raju.Rangoju@amd.com
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Raju Rangoju 2025-05-16 15:36:56 +05:30 committed by Mark Brown
parent 4614fd6342
commit 8cd079e69d
No known key found for this signature in database
GPG Key ID: 24D68B725D5487D0
1 changed files with 11 additions and 5 deletions
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16
drivers/spi/spi-amd.c
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@ -590,15 +590,21 @@ static void amd_spi_mem_data_in(struct amd_spi *amd_spi,
* Use index mode otherwise.
*/
if (amd_spi->version == AMD_HID2_SPI && amd_is_spi_read_cmd(op->cmd.opcode)) {
u64 *dma_buf64 = (u64 *)amd_spi->dma_virt_addr;
u8 *dma_buf;
amd_spi_hiddma_read(amd_spi, op);
for (i = 0; left_data >= 8; i++, left_data -= 8)
*buf_64++ = readq((u8 __iomem *)amd_spi->dma_virt_addr + (i * 8));
/* Copy data from DMA buffer */
while (left_data >= 8) {
*buf_64++ = *dma_buf64++;
left_data -= 8;
}
buf = (u8 *)buf_64;
for (i = 0; i < left_data; i++)
buf[i] = readb((u8 __iomem *)amd_spi->dma_virt_addr +
(nbytes - left_data + i));
dma_buf = (u8 *)dma_buf64;
while (left_data--)
*buf++ = *dma_buf++;
/* Reset HID RX memory logic */
data = amd_spi_readreg32(amd_spi, AMD_SPI_HID2_CNTRL);