On 02/10/2020 01:21 PM, Behme Dirk (CM/ESO2) wrote:
>> Add the memory driver for Renesas RPC-IF which registers either SPI or
>> HyperFLash device depending on the contents of the device tree subnode.
>> It also provides the absract "back end" device APIs that can be used by
>> the "front end" SPI/MTD drivers to talk to the real hardware.
>>
>> Based on the original patch by Mason Yang <masonccyang@xxxxxxxxxxx>.
>>
>> Signed-off-by: Sergei Shtylyov <sergei.shtylyov@xxxxxxxxxxxxxxxxxx>
>
>
> FYI, please find below [1] the changes I did locally on this driver. It seems to read & write successfully on my custom M3 (R8A7796) device, now.
Not for me...
BTW, your patch had whitespace ruined, I had to apply it by hand, you'd better
attach the patches, not paste. :-/
> Best regards
>
> Dirk
>
> [1]
>
> From d72b805cc461ab1e9747c973e9be84e7abb8f828 Mon Sep 17 00:00:00 2001
> From: Dirk Behme <dirk.behme@xxxxxxxxxxxx>
> Date: Tue, 4 Feb 2020 08:39:31 +0100
> Subject: [PATCH] memory: renesas-rpc-if: Correct the STRTIM and some other
> clean up
>
> This is required to make the driver work correctly in my M3 environment.
>
> Signed-off-by: Dirk Behme <dirk.behme@xxxxxxxxxxxx>
> ---
> drivers/memory/renesas-rpc-if.c | 42 ++++++++++++++++++++-------------
> 1 file changed, 25 insertions(+), 17 deletions(-)
>
> diff --git a/drivers/memory/renesas-rpc-if.c b/drivers/memory/renesas-rpc-if.c
> index 04be92b64bfa..f4356b066384 100644
> --- a/drivers/memory/renesas-rpc-if.c
> +++ b/drivers/memory/renesas-rpc-if.c
[...]
> @@ -513,19 +525,15 @@ ssize_t rpcif_dirmap_read(struct rpcif *rpc, u64 offs, size_t len, void *buf)
> pm_runtime_get_sync(rpc->dev);
>
> regmap_update_bits(rpc->regmap, RPCIF_CMNCR, RPCIF_CMNCR_MD, 0);
> - regmap_write(rpc->regmap, RPCIF_DRCR,
> - RPCIF_DRCR_RBURST(32) | RPCIF_DRCR_RBE);
> - regmap_write(rpc->regmap, RPCIF_DRCMR, rpc->command);
> - regmap_write(rpc->regmap, RPCIF_DREAR,
> - RPCIF_DREAR_EAV(offs >> 25) | RPCIF_DREAR_EAC(1));
> - regmap_write(rpc->regmap, RPCIF_DROPR, rpc->option);
> - regmap_write(rpc->regmap, RPCIF_DRENR,
> - rpc->enable & ~RPCIF_SMENR_SPIDE(0xF));
> - regmap_write(rpc->regmap, RPCIF_DRDMCR, rpc->dummy);
> - regmap_write(rpc->regmap, RPCIF_DRDRENR, rpc->ddr);
The driver somehow works only with this left in place (with 2 bytes eaten
as before), otherwise all the flash reads all 0xff (via dirmap).
> + ret = wait_msg_xfer_end(rpc);
> + if (ret) {
> + len = 0;
> + goto err_out;
> + }
>
> memcpy_fromio(buf, rpc->dirmap + from, len);
>
> +err_out:
> pm_runtime_put(rpc->dev);
>
> return len;
MBR, Sergei
