linux-kernel - Re: [PATCH v9 2/3] spi: Add Renesas R-Car Gen3 RPC-IF SPI controller driver

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Date:   Wed, 10 Apr 2019 08:27:55 +0200
From:   Marek Vasut <marek.vasut@...il.com>
To:     masonccyang@...c.com.tw,
        Sergei Shtylyov <sergei.shtylyov@...entembedded.com>
Cc:     bbrezillon@...nel.org, broonie@...nel.org,
        devicetree@...r.kernel.org,
        Geert Uytterhoeven <geert+renesas@...der.be>,
        Simon Horman <horms@...ge.net.au>, juliensu@...c.com.tw,
        lee.jones@...aro.org, linux-kernel@...r.kernel.org,
        linux-renesas-soc@...r.kernel.org, linux-spi@...r.kernel.org,
        mark.rutland@....com, robh+dt@...nel.org, zhengxunli@...c.com.tw
Subject: Re: [PATCH v9 2/3] spi: Add Renesas R-Car Gen3 RPC-IF SPI controller
 driver

On 4/10/19 3:33 AM, masonccyang@...c.com.tw wrote:
> Hi Sergei,
> 
>> > +static ssize_t rpc_spi_mem_dirmap_write(struct spi_mem_dirmap_desc
> *desc,
>> > +               u64 offs, size_t len, const void *buf)
>> > +{
>> > +   struct rpc_spi *rpc =
>> > +         spi_controller_get_devdata(desc->mem->spi->controller);
>> > +   int ret;
>> > +
>> > +   if (offs + desc->info.offset + len > U32_MAX)
>> > +      return -EINVAL;
>> > +
>> > +   if (len > RPC_WBUF_SIZE)
>> > +      len = RPC_WBUF_SIZE;
>> > +
>> > +   ret = rpc_spi_set_freq(rpc, desc->mem->spi->max_speed_hz);
>> > +   if (ret)
>> > +      return ret;
>> > +
>> > +   rpc_spi_mem_set_prep_op_cfg(desc->mem->spi,
>> > +                &desc->info.op_tmpl, &offs, &len);
>> > +
>> > +   regmap_update_bits(rpc->regmap, RPC_CMNCR, RPC_CMNCR_MD,
> RPC_CMNCR_MD);
>> > +
>> > +   regmap_write(rpc->regmap, RPC_SMDRENR, 0);
>> > +
>> > +   regmap_update_bits(rpc->regmap, RPC_PHYCNT, RPC_PHYCNT_STRTIM(7) |
>> > +            RPC_PHYCNT_WBUF2 | RPC_PHYCNT_WBUF,
>> > +            RPC_PHYCNT_WBUF2 | RPC_PHYCNT_WBUF);
>> > +
>> > +   memcpy_toio(rpc->wbuf, buf, len);
>>
>>    Wait, doesn't the manual say that the whole 256-byte buffer should be
>> filled?  I think that short chunks have to be written w/o WBUF (done,
> in fact,
>> by the HF driver).
>>
> 
> From spi-nor.c layer always transfer 256 bytes data with page program
> command.

Does that apply even for flashes with not-256-byte pages ?

-- 
Best regards,
Marek Vasut