Patch "drm/i915/vbt: split out defaults that are set when there is no VBT" has been added to the 4.11-stable tree

[<gregkh@linuxfoundation.org>]

This is a note to let you know that I've just added the patch titled

    drm/i915/vbt: split out defaults that are set when there is no VBT

to the 4.11-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     drm-i915-vbt-split-out-defaults-that-are-set-when-there-is-no-vbt.patch
and it can be found in the queue-4.11 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>From bb1d132935c2f87cd261eb559759fe49d5e5dc43 Mon Sep 17 00:00:00 2001
From: Jani Nikula <jani.nikula@intel.com>
Date: Fri, 10 Mar 2017 15:27:58 +0200
Subject: drm/i915/vbt: split out defaults that are set when there is no VBT
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

From: Jani Nikula <jani.nikula@intel.com>

commit bb1d132935c2f87cd261eb559759fe49d5e5dc43 upstream.

The main thing are the DDI ports. If there's a VBT that says there are
no outputs, we should trust that, and not have semi-random
defaults. Unfortunately, the defaults have resulted in some Chromebooks
without VBT to rely on this behaviour, so we split out the defaults for
the missing VBT case.

Reviewed-by: Manasi Navare <manasi.d.navare@intel.com>
Cc: Manasi Navare <manasi.d.navare@intel.com>
Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/95c26079ff640d43f53b944f17e9fc356b36daec.1489152288.git.jani.nikula@intel.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 drivers/gpu/drm/i915/intel_bios.c |   17 ++++++++++++++++-
 1 file changed, 16 insertions(+), 1 deletion(-)

--- a/drivers/gpu/drm/i915/intel_bios.c
+++ b/drivers/gpu/drm/i915/intel_bios.c
@@ -1341,6 +1341,7 @@ parse_device_mapping(struct drm_i915_pri
 	return;
 }
 
+/* Common defaults which may be overridden by VBT. */
 static void
 init_vbt_defaults(struct drm_i915_private *dev_priv)
 {
@@ -1377,6 +1378,18 @@ init_vbt_defaults(struct drm_i915_privat
 			&dev_priv->vbt.ddi_port_info[port];
 
 		info->hdmi_level_shift = HDMI_LEVEL_SHIFT_UNKNOWN;
+	}
+}
+
+/* Defaults to initialize only if there is no VBT. */
+static void
+init_vbt_missing_defaults(struct drm_i915_private *dev_priv)
+{
+	enum port port;
+
+	for (port = PORT_A; port < I915_MAX_PORTS; port++) {
+		struct ddi_vbt_port_info *info =
+			&dev_priv->vbt.ddi_port_info[port];
 
 		info->supports_dvi = (port != PORT_A && port != PORT_E);
 		info->supports_hdmi = info->supports_dvi;
@@ -1516,8 +1529,10 @@ void intel_bios_init(struct drm_i915_pri
 	parse_ddi_ports(dev_priv, bdb);
 
 out:
-	if (!vbt)
+	if (!vbt) {
 		DRM_INFO("Failed to find VBIOS tables (VBT)\n");
+		init_vbt_missing_defaults(dev_priv);
+	}
 
 	if (bios)
 		pci_unmap_rom(pdev, bios);


Patches currently in stable-queue which might be from jani.nikula@intel.com are

queue-4.11/drm-i915-vbt-don-t-propagate-errors-from-intel_bios_init.patch
queue-4.11/drm-i915-vbt-split-out-defaults-that-are-set-when-there-is-no-vbt.patch
queue-4.11/drm-i915-fix-runtime-pm-for-lpe-audio.patch