[PATCH v2 3/6] memory: renesas-rpc-if: Consolidate XSPI_CDTBUF0 updates in write path

From: Lad Prabhakar <[email protected]>

Program the XSPI_CDTBUF0 TRTYPE, DATASIZE and ADDSIZE fields with a
single regmap_update_bits() call in the RPCIF_DATA_OUT transfer path.

The existing code updates these fields through three separate
read-modify-write operations even though all values are known before the
transfer request is issued. Combine the updates into a single register
access to reduce overhead and simplify the configuration sequence.

Signed-off-by: Lad Prabhakar <[email protected]>
---
 drivers/memory/renesas-rpc-if.c | 9 ++-------
 1 file changed, 2 insertions(+), 7 deletions(-)

diff --git a/drivers/memory/renesas-rpc-if.c b/drivers/memory/renesas-rpc-if.c
index 50294e5d2bf5..e406afc42616 100644
--- a/drivers/memory/renesas-rpc-if.c
+++ b/drivers/memory/renesas-rpc-if.c
@@ -660,17 +660,12 @@ static int xspi_manual_xfer_impl(struct rpcif_priv *xspi)
 			u32 bytes_left = xspi->xferlen - pos;
 			u32 nbytes, data[2], *p = data;
 
-			regmap_update_bits(xspi->regmap, XSPI_CDTBUF0,
-					   XSPI_CDTBUF_TRTYPE, XSPI_CDTBUF_TRTYPE);
-
 			nbytes = bytes_left >= max ? max : bytes_left;
 
 			regmap_update_bits(xspi->regmap, XSPI_CDTBUF0,
-					   XSPI_CDTBUF_DATASIZE(0xf),
-					   XSPI_CDTBUF_DATASIZE(nbytes));
-
-			regmap_update_bits(xspi->regmap, XSPI_CDTBUF0,
+					   XSPI_CDTBUF_TRTYPE | XSPI_CDTBUF_DATASIZE(0xf) |
 					   XSPI_CDTBUF_ADDSIZE(0x7),
+					   XSPI_CDTBUF_TRTYPE | XSPI_CDTBUF_DATASIZE(nbytes) |
 					   XSPI_CDTBUF_ADDSIZE(xspi->addr_nbytes));
 
 			memcpy(data, xspi->buffer + pos, nbytes);
-- 
2.54.0