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| author | Wolfram Sang <wsa+renesas@sang-engineering.com> | 2021-11-17 10:37:10 +0100 |
|---|---|---|
| committer | Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com> | 2021-11-22 10:53:01 +0100 |
| commit | 57ea9daad51f7707f61a602a743decf10cf9fea9 (patch) | |
| tree | 9831ee7e035a12e2af8cc16e7631c45c1fe5bc91 /drivers/memory | |
| parent | 2db468d6fda4c33d26ba9dde7c72e081b2b86ad1 (diff) | |
| download | linux-57ea9daad51f7707f61a602a743decf10cf9fea9.tar.gz linux-57ea9daad51f7707f61a602a743decf10cf9fea9.tar.bz2 linux-57ea9daad51f7707f61a602a743decf10cf9fea9.zip | |
memory: renesas-rpc-if: avoid use of undocumented bits
Instead of writing fixed values with undocumented bits which happen to
be set on some SoCs, better switch to read-modify-write operations
changing only bits which are documented. This is way more future-proof
as we don't know yet how these bits may be on upcoming SoCs.
Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Tested-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
Reviewed-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
Link: https://lore.kernel.org/r/20211117093710.14430-1-wsa+renesas@sang-engineering.com
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com>
Diffstat (limited to 'drivers/memory')
| -rw-r--r-- | drivers/memory/renesas-rpc-if.c | 58 |
1 files changed, 22 insertions, 36 deletions
diff --git a/drivers/memory/renesas-rpc-if.c b/drivers/memory/renesas-rpc-if.c index edd7eb4486e1..ccd662ee2acb 100644 --- a/drivers/memory/renesas-rpc-if.c +++ b/drivers/memory/renesas-rpc-if.c @@ -20,7 +20,6 @@ #define RPCIF_CMNCR 0x0000 /* R/W */ #define RPCIF_CMNCR_MD BIT(31) -#define RPCIF_CMNCR_SFDE BIT(24) /* undocumented but must be set */ #define RPCIF_CMNCR_MOIIO3(val) (((val) & 0x3) << 22) #define RPCIF_CMNCR_MOIIO2(val) (((val) & 0x3) << 20) #define RPCIF_CMNCR_MOIIO1(val) (((val) & 0x3) << 18) @@ -287,49 +286,36 @@ int rpcif_hw_init(struct rpcif *rpc, bool hyperflash) rpcif_rzg2l_timing_adjust_sdr(rpc); } - /* - * NOTE: The 0x260 are undocumented bits, but they must be set. - * RPCIF_PHYCNT_STRTIM is strobe timing adjustment bits, - * 0x0 : the delay is biggest, - * 0x1 : the delay is 2nd biggest, - * On H3 ES1.x, the value should be 0, while on others, - * the value should be 7. - */ - if (rpc->type == RPCIF_RCAR_GEN3) { - regmap_write(rpc->regmap, RPCIF_PHYCNT, RPCIF_PHYCNT_STRTIM(7) | - RPCIF_PHYCNT_PHYMEM(hyperflash ? 3 : 0) | 0x260); - } else { - regmap_read(rpc->regmap, RPCIF_PHYCNT, &dummy); - dummy &= ~RPCIF_PHYCNT_PHYMEM_MASK; - dummy |= RPCIF_PHYCNT_PHYMEM(hyperflash ? 3 : 0) | 0x260; - regmap_write(rpc->regmap, RPCIF_PHYCNT, dummy); - } + regmap_update_bits(rpc->regmap, RPCIF_PHYCNT, RPCIF_PHYCNT_PHYMEM_MASK, + RPCIF_PHYCNT_PHYMEM(hyperflash ? 3 : 0)); + + if (rpc->type == RPCIF_RCAR_GEN3) + regmap_update_bits(rpc->regmap, RPCIF_PHYCNT, + RPCIF_PHYCNT_STRTIM(7), RPCIF_PHYCNT_STRTIM(7)); - /* - * NOTE: The 0x1511144 are undocumented bits, but they must be set - * for RPCIF_PHYOFFSET1. - * The 0x31 are undocumented bits, but they must be set - * for RPCIF_PHYOFFSET2. - */ - regmap_write(rpc->regmap, RPCIF_PHYOFFSET1, 0x1511144 | - RPCIF_PHYOFFSET1_DDRTMG(3)); - regmap_write(rpc->regmap, RPCIF_PHYOFFSET2, 0x31 | - RPCIF_PHYOFFSET2_OCTTMG(4)); + regmap_update_bits(rpc->regmap, RPCIF_PHYOFFSET1, RPCIF_PHYOFFSET1_DDRTMG(3), + RPCIF_PHYOFFSET1_DDRTMG(3)); + regmap_update_bits(rpc->regmap, RPCIF_PHYOFFSET2, RPCIF_PHYOFFSET2_OCTTMG(7), + RPCIF_PHYOFFSET2_OCTTMG(4)); if (hyperflash) regmap_update_bits(rpc->regmap, RPCIF_PHYINT, RPCIF_PHYINT_WPVAL, 0); if (rpc->type == RPCIF_RCAR_GEN3) - regmap_write(rpc->regmap, RPCIF_CMNCR, RPCIF_CMNCR_SFDE | - RPCIF_CMNCR_MOIIO_HIZ | RPCIF_CMNCR_IOFV_HIZ | - RPCIF_CMNCR_BSZ(hyperflash ? 1 : 0)); + regmap_update_bits(rpc->regmap, RPCIF_CMNCR, + RPCIF_CMNCR_MOIIO_HIZ | RPCIF_CMNCR_BSZ(3), + RPCIF_CMNCR_MOIIO_HIZ | + RPCIF_CMNCR_BSZ(hyperflash ? 1 : 0)); else - regmap_write(rpc->regmap, RPCIF_CMNCR, RPCIF_CMNCR_SFDE | - RPCIF_CMNCR_MOIIO3(1) | RPCIF_CMNCR_MOIIO2(1) | - RPCIF_CMNCR_MOIIO1(1) | RPCIF_CMNCR_MOIIO0(1) | - RPCIF_CMNCR_IO3FV(2) | RPCIF_CMNCR_IO2FV(2) | - RPCIF_CMNCR_IO0FV(2) | RPCIF_CMNCR_BSZ(hyperflash ? 1 : 0)); + regmap_update_bits(rpc->regmap, RPCIF_CMNCR, + RPCIF_CMNCR_MOIIO_HIZ | RPCIF_CMNCR_IOFV_HIZ | + RPCIF_CMNCR_BSZ(3), + RPCIF_CMNCR_MOIIO3(1) | RPCIF_CMNCR_MOIIO2(1) | + RPCIF_CMNCR_MOIIO1(1) | RPCIF_CMNCR_MOIIO0(1) | + RPCIF_CMNCR_IO3FV(2) | RPCIF_CMNCR_IO2FV(2) | + RPCIF_CMNCR_IO0FV(2) | + RPCIF_CMNCR_BSZ(hyperflash ? 1 : 0)); /* Set RCF after BSZ update */ regmap_write(rpc->regmap, RPCIF_DRCR, RPCIF_DRCR_RCF); |