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

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>

diff --git a/drivers/spi/spi-amd.c b/drivers/spi/spi-amd.c
index 90b1f7d..52d893d 100644 (file)
--- a/drivers/spi/spi-amd.c
+++ b/drivers/spi/spi-amd.c
@@ -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);