From mboxrd@z Thu Jan 1 00:00:00 1970 From: Tomi Valkeinen Date: Thu, 28 Jun 2012 15:14:18 +0000 Subject: Re: [PATCH 3/3] OMAPDSS: HDMI: Cache EDID Message-Id: <1340896458.5037.131.camel@deskari> MIME-Version: 1 Content-Type: multipart/mixed; boundary="=-96cmH2sjNRqU/YvAHvjR" List-Id: References: <1340805944-28805-1-git-send-email-jaswinder.singh@linaro.org> <1340869729.5037.7.camel@deskari> <1340878461.5037.30.camel@deskari> <1340881815.5037.53.camel@deskari> <4FEC47FA.1040801@linaro.org> In-Reply-To: To: Jassi Brar Cc: Andy Green , mythripk@ti.com, linux-omap@vger.kernel.org, linux-fbdev@vger.kernel.org, n-dechesne@ti.com, patches@linaro.org --=-96cmH2sjNRqU/YvAHvjR Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Thu, 2012-06-28 at 18:43 +0530, Jassi Brar wrote: > A quick reaction of my guts say, we simply enable 5V/HPD_IRQ during > probe and disable during remove. > HDMI enable/disable via /sysfs/ and HPD (de)assertion, switch only > HDMI_PHY on/off. > The user selecting "Autodetect and Configure" option would then equate > to "(un)loading" of the HDMI driver. > Not to mean a trivial job. One more thing I realized while thinking about this: While it could be argued that the power draw from having the tpd12s015 always enabled is very small, I think it could matter. If you consider a phone with HDMI output, it's likely that the phone is locked 99% of the time. When the phone is locked, there's no need to keep the HDMI HPD enabled. So this could add to a considerable amount of power wasted, if the HPD was always enabled. At least I can't figure out a reason why one would want the HPD to work when the phone is locked. Also, I have never used the HDMI output on my phone, so I'd be glad if it was totally powered off if it gave me more standby hours =3D). Tomi --=-96cmH2sjNRqU/YvAHvjR Content-Type: application/pgp-signature; name="signature.asc" Content-Description: This is a digitally signed message part Content-Transfer-Encoding: 7bit -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.11 (GNU/Linux) iQIcBAABAgAGBQJP7HTKAAoJEPo9qoy8lh71deoP/j2uDc8Lt2pcC8bDEFRBPhjR +R1f3R1AsMeRe8eods4VOhGbMrI0EbZ2Rw9Qkckmo1cnnsN4zydJy8mAY5bizIx9 F8R5bH6q5znvd6e2N+NbKhESRCAzA99INQarXJXezCEc277XDrcyvrbkLn+aGBmG IuvxBrgI26Ijde0sPd59CwBfnTlZmQojUy1yRP0TmM6PL4folY4j2K8B/jELf1ms Zi0BWvBlCL3XOAjMMK88NqVA+9umCA4X13b47duC3s+STaTJuaGZeqZ/RsaLTy+b AgZQWMucIbIMegelKUxR4qLwEhuBFOLO+2mDIwRR2DlgOl4DywTBpiBFdbnK0BsJ 91D+Q8H0pCdmYcrnsi8o64aFXPVDw+6z/6+6L+oy00BBkVWGn127VxnSMh+8i0B8 3FwZ716ixRin19HUdp5Xymgg7r8WSuWxk21dS04qCzBo99gPHIX7RJWCsBNxjFdR FbfLBk2SYr+ddrouzl4avv+5YBwO0ILyQWXPXh+2F9jzykCDZ1TP1SjgfYJUn/MO ItSO0vxq2nzAPkbwpLJJofh8OK7EjJuuR+19nhKY2PkKUBnlbGMIF0dt+mIkS0ti lOuIeL9Rbjk5/QK2FY/bwRM2IyiaecSC8gXRCYUuBVjq4LqlnZmoOdha4yfHVOao 0RkdZM2wU7L8HvLrxlMJ =ktqH -----END PGP SIGNATURE----- --=-96cmH2sjNRqU/YvAHvjR-- From mboxrd@z Thu Jan 1 00:00:00 1970 From: Tomi Valkeinen Subject: Re: [PATCH 3/3] OMAPDSS: HDMI: Cache EDID Date: Thu, 28 Jun 2012 18:14:18 +0300 Message-ID: <1340896458.5037.131.camel@deskari> References: <1340805944-28805-1-git-send-email-jaswinder.singh@linaro.org> <1340869729.5037.7.camel@deskari> <1340878461.5037.30.camel@deskari> <1340881815.5037.53.camel@deskari> <4FEC47FA.1040801@linaro.org> Mime-Version: 1.0 Content-Type: multipart/signed; micalg="pgp-sha1"; protocol="application/pgp-signature"; boundary="=-96cmH2sjNRqU/YvAHvjR" Return-path: Received: from na3sys009aog103.obsmtp.com ([74.125.149.71]:33183 "EHLO na3sys009aog103.obsmtp.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751459Ab2F1POX (ORCPT ); Thu, 28 Jun 2012 11:14:23 -0400 Received: by bkcje2 with SMTP id je2so1392224bkc.15 for ; Thu, 28 Jun 2012 08:14:20 -0700 (PDT) In-Reply-To: Sender: linux-omap-owner@vger.kernel.org List-Id: linux-omap@vger.kernel.org To: Jassi Brar Cc: Andy Green , mythripk@ti.com, linux-omap@vger.kernel.org, linux-fbdev@vger.kernel.org, n-dechesne@ti.com, patches@linaro.org --=-96cmH2sjNRqU/YvAHvjR Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Thu, 2012-06-28 at 18:43 +0530, Jassi Brar wrote: > A quick reaction of my guts say, we simply enable 5V/HPD_IRQ during > probe and disable during remove. > HDMI enable/disable via /sysfs/ and HPD (de)assertion, switch only > HDMI_PHY on/off. > The user selecting "Autodetect and Configure" option would then equate > to "(un)loading" of the HDMI driver. > Not to mean a trivial job. One more thing I realized while thinking about this: While it could be argued that the power draw from having the tpd12s015 always enabled is very small, I think it could matter. If you consider a phone with HDMI output, it's likely that the phone is locked 99% of the time. When the phone is locked, there's no need to keep the HDMI HPD enabled. So this could add to a considerable amount of power wasted, if the HPD was always enabled. At least I can't figure out a reason why one would want the HPD to work when the phone is locked. Also, I have never used the HDMI output on my phone, so I'd be glad if it was totally powered off if it gave me more standby hours =3D). Tomi --=-96cmH2sjNRqU/YvAHvjR Content-Type: application/pgp-signature; name="signature.asc" Content-Description: This is a digitally signed message part Content-Transfer-Encoding: 7bit -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.11 (GNU/Linux) iQIcBAABAgAGBQJP7HTKAAoJEPo9qoy8lh71deoP/j2uDc8Lt2pcC8bDEFRBPhjR +R1f3R1AsMeRe8eods4VOhGbMrI0EbZ2Rw9Qkckmo1cnnsN4zydJy8mAY5bizIx9 F8R5bH6q5znvd6e2N+NbKhESRCAzA99INQarXJXezCEc277XDrcyvrbkLn+aGBmG IuvxBrgI26Ijde0sPd59CwBfnTlZmQojUy1yRP0TmM6PL4folY4j2K8B/jELf1ms Zi0BWvBlCL3XOAjMMK88NqVA+9umCA4X13b47duC3s+STaTJuaGZeqZ/RsaLTy+b AgZQWMucIbIMegelKUxR4qLwEhuBFOLO+2mDIwRR2DlgOl4DywTBpiBFdbnK0BsJ 91D+Q8H0pCdmYcrnsi8o64aFXPVDw+6z/6+6L+oy00BBkVWGn127VxnSMh+8i0B8 3FwZ716ixRin19HUdp5Xymgg7r8WSuWxk21dS04qCzBo99gPHIX7RJWCsBNxjFdR FbfLBk2SYr+ddrouzl4avv+5YBwO0ILyQWXPXh+2F9jzykCDZ1TP1SjgfYJUn/MO ItSO0vxq2nzAPkbwpLJJofh8OK7EjJuuR+19nhKY2PkKUBnlbGMIF0dt+mIkS0ti lOuIeL9Rbjk5/QK2FY/bwRM2IyiaecSC8gXRCYUuBVjq4LqlnZmoOdha4yfHVOao 0RkdZM2wU7L8HvLrxlMJ =ktqH -----END PGP SIGNATURE----- --=-96cmH2sjNRqU/YvAHvjR--