[PATCH 5.10.y-cip 1/3] memory: renesas-rpc-if: Clear HS bit during hardware initialization

[Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>]

From: Cong Dang <cong.dang.xn@renesas.com>

commit 5192481f908e576be42bd39ec12979b79e11f7e0 upstream.

According to the datasheet, HS bit should be specified to 1 when using
DMA transfer. As DMA transfer is not supported, it should be cleared to
0.

Previously, the driver relied on the HS bit being cleared by prior
firmware but this is not always the case.

Fix this by ensuring the bit is cleared during hardware initialization.

Fixes: ca7d8b980b67 ("memory: add Renesas RPC-IF driver")
Signed-off-by: Cong Dang <cong.dang.xn@renesas.com>
Signed-off-by: Hai Pham <hai.pham.ud@renesas.com>
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Reviewed-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Link: https://lore.kernel.org/r/08d9fb10b3051decebf871267a6e2e7cb2d4faf9.1665583089.git.geert+renesas@glider.be
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
---
 drivers/memory/renesas-rpc-if.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/memory/renesas-rpc-if.c b/drivers/memory/renesas-rpc-if.c
index 6a096a033651..598180b2adaf 100644
--- a/drivers/memory/renesas-rpc-if.c
+++ b/drivers/memory/renesas-rpc-if.c
@@ -318,6 +318,9 @@ int rpcif_hw_init(struct rpcif *rpc, bool hyperflash)
 	regmap_update_bits(rpc->regmap, RPCIF_PHYCNT, RPCIF_PHYCNT_PHYMEM_MASK,
 			   RPCIF_PHYCNT_PHYMEM(hyperflash ? 3 : 0));
 
+	/* DMA Transfer is not supported */
+	regmap_update_bits(rpc->regmap, RPCIF_PHYCNT, RPCIF_PHYCNT_HS, 0);
+
 	if (rpc->type == RPCIF_RCAR_GEN3)
 		regmap_update_bits(rpc->regmap, RPCIF_PHYCNT,
 				   RPCIF_PHYCNT_STRTIM(7), RPCIF_PHYCNT_STRTIM(7));
-- 
2.34.1