Attachment 129802 Details for Bug 98912 – Set short HPD signaling

[patch] Set short HPD signaling

0001-drm-i915-lspcon-Set-short-HPD-signaling.patch (text/plain), 1.55 KB, created by Imre Deak on 2017-02-21 17:28:35 UTC

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Creator: Imre Deak

Created: 2017-02-21 17:28:35 UTC

Size: 1.55 KB

patch

obsolete

>From 5b435132259323fa43b43c52dbc6f7ede286c4c6 Mon Sep 17 00:00:00 2001
>From: Imre Deak <imre.deak@intel.com>
>Date: Tue, 21 Feb 2017 18:31:54 +0200
>Subject: [PATCH] drm/i915/lspcon: Set short HPD signaling
>
>Signed-off-by: Imre Deak <imre.deak@intel.com>
>---
> drivers/gpu/drm/i915/intel_lspcon.c | 18 ++++++++++++++++++
> 1 file changed, 18 insertions(+)
>
>diff --git a/drivers/gpu/drm/i915/intel_lspcon.c b/drivers/gpu/drm/i915/intel_lspcon.c
>index 71cbe9c..890c646 100644
>--- a/drivers/gpu/drm/i915/intel_lspcon.c
>+++ b/drivers/gpu/drm/i915/intel_lspcon.c
>@@ -209,6 +209,8 @@ bool lspcon_init(struct intel_digital_port *intel_dig_port)
> 	struct intel_lspcon *lspcon = &intel_dig_port->lspcon;
> 	struct drm_device *dev = intel_dig_port->base.base.dev;
> 	struct drm_i915_private *dev_priv = to_i915(dev);
>+	u8 branch_ctrl;
>+	ssize_t ret;
> 
> 	if (!IS_GEN9(dev_priv)) {
> 		DRM_ERROR("LSPCON is supported on GEN9 only\n");
>@@ -242,6 +244,22 @@ bool lspcon_init(struct intel_digital_port *intel_dig_port)
> 
> 	intel_dp_read_desc(dp);
> 
>+	ret = drm_dp_dpcd_readb(&dp->aux, DP_BRANCH_DEVICE_CTRL, &branch_ctrl);
>+	if (ret != 1) {
>+		DRM_DEBUG_KMS("Can't read branch device ctrl (%zd)\n", ret);
>+	} else {
>+		DRM_DEBUG_KMS("Original branch device ctrl: %02x\n",
>+			      branch_ctrl);
>+
>+		branch_ctrl |= DP_BRANCH_DEVICE_IRQ_HPD;
>+
>+		ret = drm_dp_dpcd_writeb(&dp->aux, DP_BRANCH_DEVICE_CTRL,
>+					 DP_BRANCH_DEVICE_IRQ_HPD);
>+		if (ret != 1)
>+			DRM_DEBUG_KMS("Can't enable short HPD signaling (%zd)\n",
>+				      ret);
>+	}
>+
> 	DRM_DEBUG_KMS("Success: LSPCON init\n");
> 	return true;
> }
>-- 
>2.5.0
>

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Attachments on bug 98912: 128283 | 128284 | 128290 | 128296 | 129802 | 129827 | 129873

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