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[88.113.215.33]) by smtp.gmail.com with ESMTPSA id z7sm2791037lfa.81.2019.12.12.00.19.04 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 12 Dec 2019 00:19:05 -0800 (PST) From: Felipe Balbi To: Thinh Nguyen , Greg Kroah-Hartman , Thinh Nguyen , linux-usb@vger.kernel.org, devicetree@vger.kernel.org, Rob Herring , Mark Rutland Cc: John Youn Subject: Re: [RFC PATCH 13/14] usb: devicetree: dwc3: Add property to disable mult TRB fetch In-Reply-To: References: Date: Thu, 12 Dec 2019 10:19:50 +0200 Message-ID: <87mubyvtuh.fsf@kernel.org> MIME-Version: 1.0 Content-Type: multipart/signed; boundary="=-=-="; micalg=pgp-sha256; protocol="application/pgp-signature" Sender: linux-usb-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-usb@vger.kernel.org --=-=-= Content-Type: text/plain Content-Transfer-Encoding: quoted-printable Hi, Thinh Nguyen writes: > DWC_usb32 has a feature where it can issue multiple TRB fetch requests. > Add a new property to limit and only do only single TRB fetch request. > > Signed-off-by: Thinh Nguyen > --- > Documentation/devicetree/bindings/usb/dwc3.txt | 2 ++ > 1 file changed, 2 insertions(+) > > diff --git a/Documentation/devicetree/bindings/usb/dwc3.txt b/Documentati= on/devicetree/bindings/usb/dwc3.txt > index ff35fa6de2eb..29d6f9b1fc70 100644 > --- a/Documentation/devicetree/bindings/usb/dwc3.txt > +++ b/Documentation/devicetree/bindings/usb/dwc3.txt > @@ -108,6 +108,8 @@ Optional properties: > - snps,num-trb-prefetch: max value to do TRBs cache for DWC_usb32. The = value > can be from 1 to DWC_USB32_CACHE_TRBS_PER_TRANSFER. > Default value is DWC_USB32_CACHE_TRBS_PER_TRANSFER. > + - snps,dis-mult-trb-fetch: set to issue only single TRB fetch request in > + DWC_usb32. two questions: =2D how is this different from passing 1 to the previous DT binding =2D do we know of anybody having issues with multi-trb prefetch? =2D-=20 balbi --=-=-= Content-Type: application/pgp-signature; name="signature.asc" -----BEGIN PGP SIGNATURE----- iQIzBAEBCAAdFiEElLzh7wn96CXwjh2IzL64meEamQYFAl3x+CYACgkQzL64meEa mQb0HBAA3L/LffH8+b3EL5yPsoWNT8i2KENKIFVWIMyIBAyCA4yoIVvZo0oukQhY stJ/1DjEX0XhdjKFzA+XU6pQpP3XRmMubYY1rWqF6GhSoQU6VR/eIeECe8OaFD/L hXQbn2cC7G52N+IBqP0e3RLDknhWD0JKPW5IsziRPpZhmau/Yu3JB3bBo1eCEKQ0 1ECXeX87cYAKFtv1judsHH2fHB2CMmViWDPwRaWmYwcKsoI1b2sGC37mp2jE5ZeC 9A4T95nrtkCTLv2uOHW/UjS+vvyxXuYX+q/M96C+ZM6/k++q9dJzSjOgw3X3PTB3 rERhz9NRHD8hyouiW0zN/HPRbQMX3XZE/PFTPFMdA753dsstcKGTYe4MgyiyF2zn 7jnPCXW3FU9k2YDEFjmjF3Kt4rN0rcppkJpCHPn5pTXbavLO2HQLqqX4rqEA6N59 7zclIwSM+ekbu7RpUx/xW34/ii/MAwLhWR0/ddFmjr08jyS5YJAVtL2P1pXD6o8b yAtJEDRlglRVoRrSrVVwam8s9gMLUR58VRweKBNJoSf5Gk3BObw9VfheVhrxStP4 rGTunWH6RH+9LY+KQzjjiqekoMOHVwr3tl23B76Cw/o3ZmIx8HLDv5YDS+o9FbWS XzCuqyaHc06XDUHchbVtR9zHR2oGBSGJsloVu9dyDQwb6/rk0w0= =K5vC -----END PGP SIGNATURE----- --=-=-=--