From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mslow1.mail.gandi.net (mslow1.mail.gandi.net [217.70.178.240]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 7C0FE13FF4 for ; Tue, 29 Aug 2023 09:28:35 +0000 (UTC) Received: from relay8-d.mail.gandi.net (unknown [217.70.183.201]) by mslow1.mail.gandi.net (Postfix) with ESMTP id DF7E4CDE63 for ; Tue, 29 Aug 2023 09:16:21 +0000 (UTC) Received: by mail.gandi.net (Postfix) with ESMTPSA id 508541BF207; Tue, 29 Aug 2023 09:16:12 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=bootlin.com; s=gm1; t=1693300574; 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=9vq4ofEpHyOMcy5b5TahWFabzG08hTAP6j/W1z24Ls4=; b=EO9fZGZj4zW35tOltEoCC0KpG+J/t9xY52fGD7MMn72vc92p0culeB24Sgw72b9zWBgMUD 5VpQCIv7B2+DUz9b0Usyfy2zTQdDbEqrRqDulP6p3yMfFykZ73BfupGRbpbkyN4T8SZ+s6 USd0LZqzAkTcK3Po6m7jLwAsvEKZ8bA0ou9F9fxY78WLQI9ffiFmkGAKKlMIgCXfn1Q0Eb qJMJNCVk6GO/jZhdtxBDbt6s3liyg5P/xI9TMDyeYvOpD2igO+ibBZ3zc12jd0VPt+l8Pp BN2ZRWvewcN0gJ/KjqXTl/2xYSsEzIsrqs06RJnUSFAHfAscyD02TITD62DXbw== Date: Tue, 29 Aug 2023 11:16:11 +0200 From: Miquel Raynal To: Frank Li Cc: Conor Culhane , Alexandre Belloni , linux-i3c@lists.infradead.org (moderated list:SILVACO I3C DUAL-ROLE MASTER), linux-kernel@vger.kernel.org (open list), imx@lists.linux.dev Subject: Re: [PATCH 2/2] i3c: master: svc: fix probe failure when no i3c device exist Message-ID: <20230829111611.12f91348@xps-13> In-Reply-To: <20230828192502.3525418-2-Frank.Li@nxp.com> References: <20230828192502.3525418-1-Frank.Li@nxp.com> <20230828192502.3525418-2-Frank.Li@nxp.com> Organization: Bootlin X-Mailer: Claws Mail 4.0.0 (GTK+ 3.24.33; x86_64-pc-linux-gnu) Precedence: bulk X-Mailing-List: imx@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable X-GND-Sasl: miquel.raynal@bootlin.com Hi Frank, Frank.Li@nxp.com wrote on Mon, 28 Aug 2023 15:25:02 -0400: > If there are not i3c device, all ccc command will get NACK. Set no NACKed? > i3c_ccc_cmd::err as I3C_ERROR_M2. This sentence should come last and be slightly more explicit. > Return success when no i3c device found at svc_i3c_master_do_daa_locked(). Please explain why this is important/useful. > Fixes: dd3c52846d59 ("i3c: master: svc: Add Silvaco I3C master driver") Shall we consider a backport into stable kernels? > Signed-off-by: Frank Li > --- > drivers/i3c/master/svc-i3c-master.c | 13 +++++++++++-- > 1 file changed, 11 insertions(+), 2 deletions(-) >=20 > diff --git a/drivers/i3c/master/svc-i3c-master.c b/drivers/i3c/master/svc= -i3c-master.c > index 770b40e28015e..a5620103acb73 100644 > --- a/drivers/i3c/master/svc-i3c-master.c > +++ b/drivers/i3c/master/svc-i3c-master.c > @@ -789,6 +789,9 @@ static int svc_i3c_master_do_daa_locked(struct svc_i3= c_master *master, > */ > break; > } else if (SVC_I3C_MSTATUS_NACKED(reg)) { > + /* No I3C devices attached */ > + if (dev_nb =3D=3D 0) > + break; \n ? > /* > * A slave device nacked the address, this is > * allowed only once, DAA will be stopped and > @@ -1263,11 +1266,17 @@ static int svc_i3c_master_send_ccc_cmd(struct i3c= _master_controller *m, > { > struct svc_i3c_master *master =3D to_svc_i3c_master(m); > bool broadcast =3D cmd->id < 0x80; > + int ret; > =20 > if (broadcast) > - return svc_i3c_master_send_bdcast_ccc_cmd(master, cmd); > + ret =3D svc_i3c_master_send_bdcast_ccc_cmd(master, cmd); > else > - return svc_i3c_master_send_direct_ccc_cmd(master, cmd); > + ret =3D svc_i3c_master_send_direct_ccc_cmd(master, cmd); > + > + if (ret) > + cmd->err =3D I3C_ERROR_M2; > + > + return ret; > } > =20 > static int svc_i3c_master_priv_xfers(struct i3c_dev_desc *dev, Thanks, Miqu=C3=A8l