From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Greg Kroah-Hartman , alan@lxorguk.ukuu.org.uk, =?ISO-8859-15?q?Dominik=20K=C3=83=C2=B6ppl?= , Jani Nikula , Daniel Vetter , Julien Cristau Subject: [ 125/171] drm/i915: only enable sdvo hotplug irq if needed Date: Tue, 15 Jan 2013 14:44:50 -0800 Message-Id: <20130115224322.366751064@linuxfoundation.org> In-Reply-To: <20130115224313.394976595@linuxfoundation.org> References: <20130115224313.394976595@linuxfoundation.org> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org List-ID: 3.4-stable review patch. If anyone has any objections, please let me know. ------------------ From: Jani Nikula commit fcbc50da7753b210b4442ca9abc4efbd4e481f6e upstream. Avoid constant wakeups caused by noisy irq lines when we don't even care about the irq. This should be particularly useful for i945g/gm where the hotplug has been disabled: commit 768b107e4b3be0acf6f58e914afe4f337c00932b Author: Daniel Vetter Date: Fri May 4 11:29:56 2012 +0200 drm/i915: disable sdvo hotplug on i945g/gm v2: While at it, remove the bogus hotplug_active read, and do not mask hotplug_active[0] before checking whether the irq is needed, per discussion with Daniel on IRC. Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=38442 Tested-by: Dominik Köppl Signed-off-by: Jani Nikula Signed-off-by: Daniel Vetter Signed-off-by: Julien Cristau Signed-off-by: Greg Kroah-Hartman --- drivers/gpu/drm/i915/intel_sdvo.c | 15 ++++++--------- 1 file changed, 6 insertions(+), 9 deletions(-) --- a/drivers/gpu/drm/i915/intel_sdvo.c +++ b/drivers/gpu/drm/i915/intel_sdvo.c @@ -2570,7 +2570,6 @@ bool intel_sdvo_init(struct drm_device * hotplug_mask = IS_SDVOB(sdvo_reg) ? SDVOB_HOTPLUG_INT_STATUS_I915 : SDVOC_HOTPLUG_INT_STATUS_I915; } - dev_priv->hotplug_supported_mask |= hotplug_mask; drm_encoder_helper_add(&intel_encoder->base, &intel_sdvo_helper_funcs); @@ -2578,14 +2577,6 @@ bool intel_sdvo_init(struct drm_device * if (!intel_sdvo_get_capabilities(intel_sdvo, &intel_sdvo->caps)) goto err; - /* Set up hotplug command - note paranoia about contents of reply. - * We assume that the hardware is in a sane state, and only touch - * the bits we think we understand. - */ - intel_sdvo_get_value(intel_sdvo, SDVO_CMD_GET_ACTIVE_HOT_PLUG, - &intel_sdvo->hotplug_active, 2); - intel_sdvo->hotplug_active[0] &= ~0x3; - if (intel_sdvo_output_setup(intel_sdvo, intel_sdvo->caps.output_flags) != true) { DRM_DEBUG_KMS("SDVO output failed to setup on SDVO%c\n", @@ -2593,6 +2584,12 @@ bool intel_sdvo_init(struct drm_device * goto err; } + /* Only enable the hotplug irq if we need it, to work around noisy + * hotplug lines. + */ + if (intel_sdvo->hotplug_active[0]) + dev_priv->hotplug_supported_mask |= hotplug_mask; + intel_sdvo_select_ddc_bus(dev_priv, intel_sdvo, sdvo_reg); /* Set the input timing to the screen. Assume always input 0. */