[PATCH] memory: renesas-rpc-if: Fix IO state based on flash type

[Biju Das <biju.das.jz@bp.renesas.com>]

Currently, RZ/G2L-alike SoCs use 2 different SPI serial flash memories
 1) AT25QL128A  embedded in RZ/{G2UL,Five} SMARC EVKs
 2) MT25QU512AB embedded in RZ/{G2L,G2LC,V2L} SMARC EVKs

As per section 8.14 on the AT25QL128A hardware manual,
IO1..IO3 must be set to Hi-Z state for this flash for fast read quad IO.
Snippet from HW manual section 8.14:
The upper nibble of the Mode(M7-4) controls the length of the next FAST
Read Quad IO instruction through the inclusion or exclusion of the first
byte instruction code. The lower nibble bits of the Mode(M3-0) are don't
care. However, the IO pins must be high-impedance before the falling edge
of the first data out clock.

As per the Figure 20: QUAD INPUT/OUTPUT FAST READ on MT25QU512AB mentions
IO1..IO2 to be in Hi-Z state and IO3 in '1' state

Add a variable io3_fv to struct rpcif_priv and check the child
node compatible value to detect micron flash and set IO1..IO3 states
based on flash type.

Signed-off-by: Biju Das <biju.das.jz@bp.renesas.com>
---
 drivers/memory/renesas-rpc-if.c | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/drivers/memory/renesas-rpc-if.c b/drivers/memory/renesas-rpc-if.c
index 9695b2d3ae59..68f2bb3f8e61 100644
--- a/drivers/memory/renesas-rpc-if.c
+++ b/drivers/memory/renesas-rpc-if.c
@@ -189,6 +189,7 @@ struct rpcif_priv {
 	u32 enable;		/* DRENR or SMENR */
 	u32 dummy;		/* DRDMCR or SMDMCR */
 	u32 ddr;		/* DRDRENR or SMDRENR */
+	u32 io3_fv;
 };
 
 static const struct rpcif_info rpcif_info_r8a7796 = {
@@ -367,7 +368,8 @@ int rpcif_hw_init(struct device *dev, bool hyperflash)
 		regmap_update_bits(rpc->regmap, RPCIF_CMNCR,
 				   RPCIF_CMNCR_MOIIO(3) | RPCIF_CMNCR_IOFV(3) |
 				   RPCIF_CMNCR_BSZ(3),
-				   RPCIF_CMNCR_MOIIO(1) | RPCIF_CMNCR_IOFV(2) |
+				   RPCIF_CMNCR_MOIIO(1) | RPCIF_CMNCR_IO0FV(2) |
+				   RPCIF_CMNCR_IO2FV(3) | rpc->io3_fv |
 				   RPCIF_CMNCR_BSZ(hyperflash ? 1 : 0));
 	else
 		regmap_update_bits(rpc->regmap, RPCIF_CMNCR,
@@ -774,6 +776,12 @@ static int rpcif_probe(struct platform_device *pdev)
 		return ret;
 	}
 
+	if (rpc->info->type == RPCIF_RZ_G2L &&
+	    of_device_is_compatible(flash, "micron,mt25qu512a"))
+		rpc->io3_fv = RPCIF_CMNCR_IO3FV(1);
+	else
+		rpc->io3_fv = RPCIF_CMNCR_IO3FV(3);
+
 	return 0;
 }
 
-- 
2.25.1