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Received: by mail.gandi.net (Postfix) with ESMTPSA id 2734820010; Tue, 6 Jun 2023 07:03:46 +0000 (UTC) Date: Tue, 6 Jun 2023 09:03:44 +0200 From: Miquel Raynal To: Arseniy Krasnov Cc: Liang Yang , Richard Weinberger , Vignesh Raghavendra , Neil Armstrong , Kevin Hilman , Jerome Brunet , Martin Blumenstingl , , , , , , Subject: Re: [RFC PATCH v5 2/6] mtd: rawnand: meson: wait for command in polling mode Message-ID: <20230606090344.3aca96c8@xps-13> In-Reply-To: References: <20230601061850.3907800-1-AVKrasnov@sberdevices.ru> <20230601061850.3907800-3-AVKrasnov@sberdevices.ru> <20230601100751.41c3ff0b@xps-13> <9e106d50-2524-c999-48b1-a20760238aaf@sberdevices.ru> <20230605110546.6cb00a8d@xps-13> <2a755783-1d56-9842-2eee-b5ab41152c81@amlogic.com> <163e0684-caff-77d0-1eaf-9a58290c200d@amlogic.com> Organization: Bootlin X-Mailer: Claws Mail 4.0.0 (GTK+ 3.24.33; x86_64-pc-linux-gnu) MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: 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2023 00:03:50 -0700 (PDT) X-GND-Sasl: miquel.raynal@bootlin.com DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=bootlin.com; s=gm1; t=1686035029; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=reafBMrUZj+7Va9OhYXaqDy3QOGdwu434t/u9hYeCkc=; b=fnifd9QSx/KpYKg+eS5X/XcAS3vs+xQ765oNv2AoThbgpBo4q/8H4ROsyNwUKf7a+GaNXU ihJW2gBv4OxsC7hs5iP1ukBE9v6lXuY/9lU7+ycDkRCe0k4mk0g0SrzPY3WtdGc4HPRB5m sksNXL/kJl9/jfeSV/ShbSMAm1zEUcF2pBjItDgHftHEf887pHrpPsyNMFgJQvUk9P5V4J YPqDsV70g4NU9caJyKhE2dnCmoDnkno6IRXzarZlDCjR8sXA1iIj4bhAez1YEsxc0VLaSR gW2mch4tYmr5PIRuFzvD6mRZrl/ufF0FkfBDayJpmkRBOUiLhO3CcxMDYvmF+A== X-GND-Sasl: miquel.raynal@bootlin.com X-GND-Sasl: miquel.raynal@bootlin.com X-GND-Sasl: miquel.raynal@bootlin.com X-GND-Sasl: miquel.raynal@bootlin.com X-GND-Sasl: miquel.raynal@bootlin.com X-GND-Sasl: miquel.raynal@bootlin.com X-GND-Sasl: miquel.raynal@bootlin.com X-GND-Sasl: miquel.raynal@bootlin.com X-GND-Sasl: miquel.raynal@bootlin.com X-GND-Sasl: miquel.raynal@bootlin.com X-GND-Sasl: miquel.raynal@bootlin.com X-GND-Sasl: miquel.raynal@bootlin.com X-GND-Sasl: miquel.raynal@bootlin.com Received: by mail.gandi.net (Postfix) with ESMTPSA id 2734820010; Tue, 6 Jun 2023 07:03:46 +0000 (UTC) Date: Tue, 6 Jun 2023 09:03:44 +0200 From: Miquel Raynal To: Arseniy Krasnov Cc: Liang Yang , Richard Weinberger , Vignesh Raghavendra , Neil Armstrong , Kevin Hilman , Jerome Brunet , Martin Blumenstingl , , , , , , Subject: Re: [RFC PATCH v5 2/6] mtd: rawnand: meson: wait for command in polling mode Message-ID: <20230606090344.3aca96c8@xps-13> In-Reply-To: References: <20230601061850.3907800-1-AVKrasnov@sberdevices.ru> <20230601061850.3907800-3-AVKrasnov@sberdevices.ru> <20230601100751.41c3ff0b@xps-13> <9e106d50-2524-c999-48b1-a20760238aaf@sberdevices.ru> <20230605110546.6cb00a8d@xps-13> <2a755783-1d56-9842-2eee-b5ab41152c81@amlogic.com> <163e0684-caff-77d0-1eaf-9a58290c200d@amlogic.com> Organization: Bootlin X-Mailer: Claws Mail 4.0.0 (GTK+ 3.24.33; x86_64-pc-linux-gnu) MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi Arseniy, avkrasnov@sberdevices.ru wrote on Mon, 5 Jun 2023 19:58:02 +0300: > On 05.06.2023 16:30, Liang Yang wrote: > >=20 > >=20 > > On 2023/6/5 21:19, Liang Yang wrote: =20 > >> Hi Miquel and Arseniy, > >> > >> > >> On 2023/6/5 17:05, Miquel Raynal wrote: =20 > >>> [ EXTERNAL EMAIL ] > >>> > >>> Hi Arseniy, > >>> =20 > >>>>>> @@ -1412,6 +1419,8 @@ static int meson_nfc_probe(struct platform_d= evice *pdev) > >>>>>> =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= return ret; > >>>>>> =C2=A0=C2=A0=C2=A0 } > >>>>>> > >>>>>> +=C2=A0 nfc->use_polling =3D of_property_read_bool(dev->of_node, "= polling"); =20 > >>>>> > >>>>> This is a problem. You cannot add a polling property like that. > >>>>> > >>>>> There is already a nand-rb property which is supposed to carry how = are > >>>>> wired the RB lines. I don't see any in-tree users of the compatible= s, I > >>>>> don't know how acceptable it is to consider using soft fallback when > >>>>> this property is missing, otherwise take the values of the rb lines > >>>>> provided in the DT and user hardware control, but I would definitely > >>>>> prefer that. =20 > >>>> > >>>> I see. So i need to implement processing of this property here? And = if it > >>>> is missed -> use software waiting. I think interesting thing will be= that: > >>>> > >>>> 1) Even with support of this property here, I really don't know how = to pass > >>>> =C2=A0=C2=A0=C2=A0 RB values to this controller - I just have define= for RB command and that's > >>>> =C2=A0=C2=A0=C2=A0 it. I found that this property is an array of u32= - IIUC each element is > >>>> =C2=A0=C2=A0=C2=A0 RB pin per chip. May be i need to dive into the o= ld vendor's driver to find > >>>> =C2=A0=C2=A0=C2=A0 how to use RB values (although this driver uses s= oftware waiting so I'm not > >>>> =C2=A0=C2=A0=C2=A0 sure that I'll find something in it). =20 > >>> > >>> Liang, can you please give use the relevant information here? How do = we > >>> target RB0 and RB1? It seems like you use the CS as only information > >>> like if the RB lines where hardwired internally to a CS. Can we invert > >>> the lines with a specific configuration? =20 > >> > >> Controllor has only one external RB pinmux (NAND_RB0). all the RB pins > >> of different CEs need to be bound into one wire and connect with > >> NAND_RB0 if want to use controller polling rb. the current operating > >> CE of NAND is decided to "chip_select", of course controller internall= y has different nfc commands to regconize which Ce's RB signal is polling. > >> > >> <&nand_pins> in dts/yaml should include the NAND_RB0 if hardware conne= cts, or use software polling here. > >> > >> @Arseniy, sorry, i don't travel all the informations yet. but why don'= t you use the new RB_INT command with irq that i provided in another thread= . the new RB_INT command doesn't depend on the physical RB wires, it also s= end the READ status command(0x70) and wait for the irq wake up completion. = =20 >=20 > Technically no problem! I can use new RB_INT instead of 'nand_soft_waitrd= y()' as software fallback, and currently > implemented RB_INT as interrupt driven way. What do You think Miquel ? >=20 > >=20 > > Use "nand-rb" in dts to decide old RB_INT(physical RB wires is needed) = or new RB_INT(no physical RB wires). the new RB_INT command decides the RB0= or RB1 by the previous command with ce args. > > =20 >=20 > So I can implement "nand-rb" in dts as boolean value - "false" or missing= means use "no physical RB wires", "true" - means use "physical RB wires" ? As long as it works and does not contain any extremely strange READ0 or READ_STATUS in the middle of nothing, I'm fine, take the simplest approach which will work for all. >=20 > Thanks, Arseniy >=20 > >> =20 > >>> Arseniy, if the answer to my above question is no, then you should > >>> expect the nand-rb and reg arrays to be identical. If they are not, > >>> then you can return -EINVAL. > >>> > >>> If the nand-rb property is missing, then fallback to software wait. > >>> =20 > >>>> 2) I can't test RB mode - I don't have such device :( > >>>> > >>>> Also for example in arasan-nand-controller.c parsed 'nand-rb' values= are used > >>>> in controller specific register for waiting (I guess Meson controlle= r has something > >>>> like that, but I don't have doc). While in marvell_nand.c it looks l= ike that they parse > >>>> 'nand-rb' property, but never use it. =20 > >>> > >>> Yes, the logic around the second RB line (taking care of CS1/CS3) is > >>> slightly broken or at least badly documented, and thus should not be > >>> used. > >>> =20 > >>>>> In any case you'll need a dt-binding update which must be acked by > >>>>> dt-binding maintainers. =20 > >>>> > >>>> You mean to add this property desc to Documentation/devicetree/bindi= ngs/mtd/amlogic,meson-nand.yaml ? =20 > >>> > >>> Yes. In a dedicated patch. Something along the lines: > >>> > >>> =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 nand-rb: true > >>> > >>> inside the nand chip object should be fine. And flag the change as a > >>> fix because we should have used and parsed this property since the > >>> beginning. > >>> > >>> Thanks, > >>> Miqu=C3=A8l =20 Thanks, Miqu=C3=A8l