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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [day] [month] [year] [list]

Message-ID: <a6b534c8-25c3-fe29-6266-0a29a862610d@gmail.com>
Date:   Wed, 10 Apr 2019 10:03:50 +0200
From:   Marek Vasut <marek.vasut@...il.com>
To:     masonccyang@...c.com.tw
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,
        Sergei Shtylyov <sergei.shtylyov@...entembedded.com>,
        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 10:01 AM, masonccyang@...c.com.tw wrote:
> Hi,
>  
>> 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?
> 
> it could be less than 256 bytes, i.e., 128 bytes to rpc->wbuf !
> 
>  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 ?
>>
> 
> I think it needs to patch in case of nor->page_size = 512 bytes.

There are also flashes with page size < 256 bytes :)

-- 
Best regards,
Marek Vasut