Re: [Uclinux-dist-devel] [PATCH 1/2] mtd: m25p80: Reworkprobing/JEDEC code

[Barry Song <21cnbao@gmail.com>]

[-- Warning: decoded text below may be mangled, UTF-8 assumed --]
[-- Attachment #1: Type: text/plain; charset=UTF-8, Size: 2202 bytes --]

On Mon, Jun 21, 2010 at 3:15 PM, Anton Vorontsov <cbouatmailru@gmail.com> wrote:> On Mon, Jun 21, 2010 at 11:27:31AM +0800, Barry Song wrote:> [...]>> > How about we add a non_jedec flag in platform_data, if the flag is 1, we>> > let the detection pass even though the ID is 0? Otherwise, we need a>> > valid ID?>> Here i mean:>> This will break at least OF-enabled platforms (e.g. PowerPC),> they assume that the driver will success for non-JEDEC flashes.> OF platforms don't pass platform data, and even if they did,> device tree doesn't specify if the flash is JEDEC or non-JEDEC.>> Which is why I think that, by default, the driver should> successfully register the flash even if JEDEC probe fails. So,> instead of checking for "!non_jedec", I would recommend> "force_jedec" check.
Mike Frysinger suggested to use non_jedec since most devices arestandard jedec devices. Only if non_jedec=1, we let the detection passif ID is 0.
>>> Index: drivers/mtd/devices/m25p80.c>> ===================================================================>> --- drivers/mtd/devices/m25p80.c      (revision 8927)>> +++ drivers/mtd/devices/m25p80.c      (revision 8929)>> @@ -795,8 +795,13 @@>>>>               jid = jedec_probe(spi);>>               if (!jid) {>> -                     dev_info(&spi->dev, "non-JEDEC variant of %s\n",>> -                              id->name);>> +                     if (!data->non_jedec) {>> +                             dev_err(&spi->dev, "fail to detect%s\n",>> +                                             id->name);>> +                             return -ENODEV;>> +                     } else>> +                             dev_info(&spi->dev, "non-JEDEC variant of %s\n",>> +                                             id->name);>>               } else if (jid != id) {>> --> Anton Vorontsov> email: cbouatmailru@gmail.com> irc://irc.freenode.net/bd2>ÿôèº{.nÇ+‰·Ÿ®‰­†+%ŠËÿ±éݶ\x17¥Šwÿº{.nÇ+‰·¥Š{±þG«éÿŠ{ayº\x1dʇڙë,j\a­¢f£¢·hšïêÿ‘êçz_è®\x03(­éšŽŠÝ¢j"ú\x1a¶^[m§ÿÿ¾\a«þG«éÿ¢¸?™¨è­Ú&£ø§~á¶iO•æ¬z·švØ^\x14\x04\x1a¶^[m§ÿÿÃ\fÿ¶ìÿ¢¸?–I¥