From 554d6af50a40125c28e4e1035527a684d2607266 Mon Sep 17 00:00:00 2001 From: Paulo Zanoni Date: Thu, 12 Sep 2013 17:10:11 -0300 Subject: [PATCH] drm/i915: add some assertions about VBT DDI port types Our code makes a lot of assumptions regarding what each DDI port actually supports, and the VBT should tell us what is really happening in the hardware. So parse the information provided by the VBT and check if any of our assumptions is wrong. Our driver also has a history of not really trusting the VBT, so a WARN here could mean that: a) our coding assumptions are wrong b) the VBT is wrong c) we're incorrectly parsing the VBT d) the checks are wrong But I really hope we won't ever trigger any of those WARNs. v2: Don't check the redundant "Capabilities" field from byte 24 since it doesn't seem to be used. v3: Rebase v4: Replace WARN with DRM_DEBUG_KMS Signed-off-by: Paulo Zanoni Reviewed-by: Rodrigo Vivi (v2) Signed-off-by: Daniel Vetter --- drivers/gpu/drm/i915/intel_bios.c | 24 +++++++++++++++++++++++- 1 file changed, 23 insertions(+), 1 deletion(-) diff --git a/drivers/gpu/drm/i915/intel_bios.c b/drivers/gpu/drm/i915/intel_bios.c index 12e4fd18076d..7ce1c3c2f0f1 100644 --- a/drivers/gpu/drm/i915/intel_bios.c +++ b/drivers/gpu/drm/i915/intel_bios.c @@ -590,7 +590,7 @@ static void parse_ddi_port(struct drm_i915_private *dev_priv, enum port port, struct ddi_vbt_port_info *info = &dev_priv->vbt.ddi_port_info[port]; uint8_t hdmi_level_shift; int i, j; - bool is_dvi, is_dp; + bool is_dvi, is_hdmi, is_dp, is_edp, is_crt; uint8_t aux_channel; /* Each DDI port can have more than one value on the "DVO Port" field, * so look for all the possible values for each port and abort if more @@ -628,6 +628,28 @@ static void parse_ddi_port(struct drm_i915_private *dev_priv, enum port port, is_dvi = child->common.device_type & (1 << 4); is_dp = child->common.device_type & (1 << 2); + is_crt = child->common.device_type & (1 << 0); + is_hdmi = is_dvi && (child->common.device_type & (1 << 11)) == 0; + is_edp = is_dp && (child->common.device_type & (1 << 12)); + + DRM_DEBUG_KMS("Port %c VBT info: DP:%d HDMI:%d DVI:%d EDP:%d CRT:%d\n", + port_name(port), is_dp, is_hdmi, is_dvi, is_edp, is_crt); + + if (is_edp && is_dvi) + DRM_DEBUG_KMS("Internal DP port %c is TMDS compatible\n", + port_name(port)); + if (is_crt && port != PORT_E) + DRM_DEBUG_KMS("Port %c is analog\n", port_name(port)); + if (is_crt && (is_dvi || is_dp)) + DRM_DEBUG_KMS("Analog port %c is also DP or TMDS compatible\n", + port_name(port)); + if (is_dvi && (port == PORT_A || port == PORT_E)) + DRM_DEBUG_KMS("Port %c is TMDS compabile\n", port_name(port)); + if (!is_dvi && !is_dp && !is_crt) + DRM_DEBUG_KMS("Port %c is not DP/TMDS/CRT compatible\n", + port_name(port)); + if (is_edp && (port == PORT_B || port == PORT_C || port == PORT_E)) + DRM_DEBUG_KMS("Port %c is internal DP\n", port_name(port)); if (is_dvi) { if (child->common.ddc_pin == 0x05 && port != PORT_B) -- 2.39.5