From mboxrd@z Thu Jan 1 00:00:00 1970 From: Wolfram Sang Subject: Re: [PATCH v2] ARM: at91: sama5d3: reduce TWI internal clock frequency Date: Fri, 22 Nov 2013 17:25:41 +0100 Message-ID: <20131122162541.GE7420@katana> References: <1385136523-11962-1-git-send-email-ludovic.desroches@atmel.com> Mime-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha1; protocol="application/pgp-signature"; boundary="f5QefDQHtn8hx44O" Return-path: Content-Disposition: inline In-Reply-To: <1385136523-11962-1-git-send-email-ludovic.desroches-AIFe0yeh4nAAvxtiuMwx3w@public.gmane.org> Sender: linux-i2c-owner-u79uwXL29TY76Z2rM5mHXA@public.gmane.org To: ludovic.desroches-AIFe0yeh4nAAvxtiuMwx3w@public.gmane.org Cc: linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org, nicolas.ferre-AIFe0yeh4nAAvxtiuMwx3w@public.gmane.org, plagnioj-sclMFOaUSTBWk0Htik3J/w@public.gmane.org, linux-i2c-u79uwXL29TY76Z2rM5mHXA@public.gmane.org List-Id: linux-i2c@vger.kernel.org --f5QefDQHtn8hx44O Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Fri, Nov 22, 2013 at 05:08:43PM +0100, ludovic.desroches-AIFe0yeh4nAAvxtiuMwx3w@public.gmane.org wrote: > From: Ludovic Desroches >=20 > With some devices, transfer hangs during I2C frame transmission. This iss= ue > disappears when reducing the internal frequency of the TWI IP. Even if it= is > indicated that internal clock max frequency is 66MHz, it seems we have > oversampling on I2C signals making TWI believe that a transfer in progress > is done. >=20 > This fix has no impact on the I2C bus frequency. >=20 > Cc: #3.10+ > Acked-by: Nicolas Ferre > Signed-off-by: Ludovic Desroches Acked-by: Wolfram Sang --f5QefDQHtn8hx44O Content-Type: application/pgp-signature; name="signature.asc" Content-Description: Digital signature -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.15 (GNU/Linux) iQIcBAEBAgAGBQJSj4WFAAoJEBQN5MwUoCm2DAAP/0d9Gda0tD/j8zTxe6Qx7a45 f+ofVJBgk/RQgkvdwD8wVpzMG5FFcR1CKu3ZgyFbhrZUJq9T2sK5G0mr/UDa0TDd WlnxJPZZ8lDlpZAK/CMyL82AajNn1tLN3qb2ruBatPbgQSxPSbA4huZnrJQx+u6m ljba4XnKp0yB2uve07iE3mwHJexEN3EiVx1zHC+k20s8TwSI4XZHIg1Dc8ycTUgd QnV+CRisIF171McilIn9zRhkmcJoFAGhO858slLZsej58Kr3F9+lI2ZDjRNATO2I WC1aUaEltND6LLdQCb6yswaGF7as49NVQhR9889DktEmzdGyJrqIYHBjHPmpnEQ4 ERPIXowq141p+F/SRcRt7ioVjcPxmtab+hKSKACOztkLbSSe17NrgCu9aHpoGvli Kx6zLEQtR/n+EklRaq0gAx+wmbT8PVQ/0TmotP01InyKPhvCP1gzYjaVqbq1j0YL Io5lyOyl+wIlIzp16Khj7ZDh3ni7UcFdCW7DRfvgNrmX1JxskP90tpmsc2FN5PjK FqvbKVJvGvnafFiHQn6mHEiEFEPPdHVwMW7al/wt5rZUft+cjCjlHPonFPkyiNLt 1aIs7NOMLxldvF9YzPwvQFixuLncDr2e0jiA5bhqJWugHHBsnaFi79Pu7gLHb82A IaCLgn7tZgKqaHN6lvu4 =DM0h -----END PGP SIGNATURE----- --f5QefDQHtn8hx44O--