On Tue, Oct 26, 2021 at 02:01:15PM +0300, Jani Nikula wrote:
On Mon, 25 Oct 2021, Ville Syrjala ville.syrjala@linux.intel.com wrote:
From: Ville Syrjälä ville.syrjala@linux.intel.com
Looks like we never updated intel_bios_is_port_dp_dual_mode() when the VBT port mapping became erratic on modern platforms. This is causing us to look up the wrong child device and thus throwing the heuristic off (ie. we might end looking at a child device for a genuine DP++ port when we were supposed to look at one for a native HDMI port).
Fix it up by not using the outdated port_mapping[] in intel_bios_is_port_dp_dual_mode() and rely on intel_bios_encoder_data_lookup() instead.
It's just crazy, we have like 7 port_mapping tables in intel_bios.c, what happened?!
I wish we could unify all of this more.
Cc: stable@vger.kernel.org Tested-by: Randy Dunlap rdunlap@infradead.org Closes: https://gitlab.freedesktop.org/drm/intel/-/issues/4138 Signed-off-by: Ville Syrjälä ville.syrjala@linux.intel.com
drivers/gpu/drm/i915/display/intel_bios.c | 85 +++++++++++++++++------ 1 file changed, 63 insertions(+), 22 deletions(-)
diff --git a/drivers/gpu/drm/i915/display/intel_bios.c b/drivers/gpu/drm/i915/display/intel_bios.c index f9776ca85de3..2b1423a43437 100644 --- a/drivers/gpu/drm/i915/display/intel_bios.c +++ b/drivers/gpu/drm/i915/display/intel_bios.c @@ -1707,6 +1707,39 @@ static void sanitize_aux_ch(struct intel_bios_encoder_data *devdata, child->aux_channel = 0; } +static u8 dvo_port_type(u8 dvo_port) +{
- switch (dvo_port) {
- case DVO_PORT_HDMIA:
- case DVO_PORT_HDMIB:
- case DVO_PORT_HDMIC:
- case DVO_PORT_HDMID:
- case DVO_PORT_HDMIE:
- case DVO_PORT_HDMIF:
- case DVO_PORT_HDMIG:
- case DVO_PORT_HDMIH:
- case DVO_PORT_HDMII:
return DVO_PORT_HDMIA;- case DVO_PORT_DPA:
- case DVO_PORT_DPB:
- case DVO_PORT_DPC:
- case DVO_PORT_DPD:
- case DVO_PORT_DPE:
- case DVO_PORT_DPF:
- case DVO_PORT_DPG:
- case DVO_PORT_DPH:
- case DVO_PORT_DPI:
return DVO_PORT_DPA;- case DVO_PORT_MIPIA:
- case DVO_PORT_MIPIB:
- case DVO_PORT_MIPIC:
- case DVO_PORT_MIPID:
return DVO_PORT_MIPIA;- default:
return dvo_port;- }
+}
static enum port __dvo_port_to_port(int n_ports, int n_dvo, const int port_mapping[][3], u8 dvo_port) { @@ -2623,35 +2656,17 @@ bool intel_bios_is_port_edp(struct drm_i915_private *i915, enum port port) return false; } -static bool child_dev_is_dp_dual_mode(const struct child_device_config *child,
enum port port)+static bool child_dev_is_dp_dual_mode(const struct child_device_config *child) {
- static const struct {
u16 dp, hdmi;- } port_mapping[] = {
/** Buggy VBTs may declare DP ports as having* HDMI type dvo_port :( So let's check both.*/[PORT_B] = { DVO_PORT_DPB, DVO_PORT_HDMIB, },[PORT_C] = { DVO_PORT_DPC, DVO_PORT_HDMIC, },[PORT_D] = { DVO_PORT_DPD, DVO_PORT_HDMID, },[PORT_E] = { DVO_PORT_DPE, DVO_PORT_HDMIE, },[PORT_F] = { DVO_PORT_DPF, DVO_PORT_HDMIF, },- };
- if (port == PORT_A || port >= ARRAY_SIZE(port_mapping))
return false;- if ((child->device_type & DEVICE_TYPE_DP_DUAL_MODE_BITS) != (DEVICE_TYPE_DP_DUAL_MODE & DEVICE_TYPE_DP_DUAL_MODE_BITS)) return false;
- if (child->dvo_port == port_mapping[port].dp)
- if (dvo_port_type(child->dvo_port) == DVO_PORT_DPA) return true;
I wonder, why do we care about dvo_port here, while we ignore the dvo port DP/HDMI/DSI difference in parse_ddi_port()? I'm not really entirely happy about adding another dvo port check method. :/
Because VBTs suck and sometimes a DP++ port is declared as DP (as it should) but sometimes it's declared as HDMI instead. Hence the additional "do we has aux ch?" check for the dvo_port==HDMI case to make it at least try not to match native HDMI ports. I'm not sure whether we could just always do the AUX CH check and ignore the dvo_port entirely. Would need to look through a bunch of VBTs to get some idea I suppose. But that would be too much change for a bugfix anyway.
IIRC the other idea of just looking at the device_type bits was a bust on at least vlv/chv.
/* Only accept a HDMI dvo_port as DP++ if it has an AUX channel */
- if (child->dvo_port == port_mapping[port].hdmi &&
- if (dvo_port_type(child->dvo_port) == DVO_PORT_HDMIA && child->aux_channel != 0) return true;
@@ -2661,10 +2676,36 @@ static bool child_dev_is_dp_dual_mode(const struct child_device_config *child, bool intel_bios_is_port_dp_dual_mode(struct drm_i915_private *i915, enum port port) {
- static const struct {
u16 dp, hdmi;- } port_mapping[] = {
/** Buggy VBTs may declare DP ports as having* HDMI type dvo_port :( So let's check both.*/[PORT_B] = { DVO_PORT_DPB, DVO_PORT_HDMIB, },[PORT_C] = { DVO_PORT_DPC, DVO_PORT_HDMIC, },[PORT_D] = { DVO_PORT_DPD, DVO_PORT_HDMID, },[PORT_E] = { DVO_PORT_DPE, DVO_PORT_HDMIE, },[PORT_F] = { DVO_PORT_DPF, DVO_PORT_HDMIF, },- }; const struct intel_bios_encoder_data *devdata;
- if (HAS_DDI(i915)) {
const struct intel_bios_encoder_data *devdata;devdata = intel_bios_encoder_data_lookup(i915, port);return devdata && child_dev_is_dp_dual_mode(&devdata->child);- }
- if (port == PORT_A || port >= ARRAY_SIZE(port_mapping))
return false;- list_for_each_entry(devdata, &i915->vbt.display_devices, node) {
if (child_dev_is_dp_dual_mode(&devdata->child, port))
if ((devdata->child.dvo_port == port_mapping[port].dp ||devdata->child.dvo_port == port_mapping[port].hdmi) &&child_dev_is_dp_dual_mode(&devdata->child)) return true;-- Jani Nikula, Intel Open Source Graphics Center