mtd: spi: renesas: Configure DRDRENR register

Make sure DRDRENR register is configured before performing external address space read. This register might have been configured by a prior stage bootloader and leaving it unconfigured would interfere with U-Boot operation. Since U-Boot RPC SPI driver does not support DDR data transfer mode yet, set this register unconditionally to 0. Signed-off-by: Marek Vasut <[email protected]>
zyntax9999 · Sep 8, 2024 · c907950 · c907950
1 parent 3fba388
commit c907950
Showing 1 changed file with 1 addition and 0 deletions.
diff --git a/drivers/spi/renesas_rpc_spi.c b/drivers/spi/renesas_rpc_spi.c
@@ -294,6 +294,7 @@ static int rpc_spi_mem_exec_op(struct spi_slave *spi,
 
 		writel(8 * op->dummy.nbytes - 1, priv->regs + RPC_DRDMCR);
 		writel(0, priv->regs + RPC_DROPR);
+		writel(0, priv->regs + RPC_DRDRENR);
 		writel(smenr, priv->regs + RPC_DRENR);
 
 		memcpy_fromio(din, (void *)(priv->extr + offset), op->data.nbytes);