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Subject: Re: [PATCH v9 2/3] spi: Add Renesas R-Car Gen3 RPC-IF SPI controller
 driver
To:     masonccyang@mxic.com.tw,
        Sergei Shtylyov <sergei.shtylyov@cogentembedded.com>
Cc:     bbrezillon@kernel.org, broonie@kernel.org,
        devicetree@vger.kernel.org,
        Geert Uytterhoeven <geert+renesas@glider.be>,
        Simon Horman <horms@verge.net.au>, juliensu@mxic.com.tw,
        lee.jones@linaro.org, linux-kernel@vger.kernel.org,
        linux-renesas-soc@vger.kernel.org, linux-spi@vger.kernel.org,
        mark.rutland@arm.com, robh+dt@kernel.org, zhengxunli@mxic.com.tw
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 <OFC7F0028A.CFF6BD04-ON482583D8.00084FA1-482583D8.0008985F@mxic.com.tw>
From:   Marek Vasut <marek.vasut@gmail.com>
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Date:   Wed, 10 Apr 2019 08:27:55 +0200
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On 4/10/19 3:33 AM, masonccyang@mxic.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