The ACK/NACK implementation as found in e.g. the G965 has the falling clock edge and the release of the data line to ACK the received byte happen at the same time.
Some HDMI-to-VGA converters apparently read the ACK not in the middle of the clock high phase, but at the rising clock edge, so instead of an ACK sometimes a NACK is read and the slave (i.e. the EDID ROM) ends the transfer.
The bitbanging releases the data line for the ACK only 1/4 bit time after the falling clock edge, so a slave will see the correct value no matter if is samples at the rising or the falling clock edge or in the center.
Fallback to bitbanging is already done for the CRT connector.
Bug: https://bugs.freedesktop.org/show_bug.cgi?id=92685
Signed-off-by: Stefan Brüns stefan.bruens@rwth-aachen.de
---
drivers/gpu/drm/i915/intel_hdmi.c | 14 +++++++++++--- 1 file changed, 11 insertions(+), 3 deletions(-)
diff --git a/drivers/gpu/drm/i915/intel_hdmi.c b/drivers/gpu/drm/i915/intel_hdmi.c index 4dea833f9d1b..847cda4c017c 100644 --- a/drivers/gpu/drm/i915/intel_hdmi.c +++ b/drivers/gpu/drm/i915/intel_hdmi.c @@ -1573,12 +1573,20 @@ intel_hdmi_set_edid(struct drm_connector *connector) struct intel_hdmi *intel_hdmi = intel_attached_hdmi(connector); struct edid *edid; bool connected = false; + struct i2c_adapter *i2c;
intel_display_power_get(dev_priv, POWER_DOMAIN_GMBUS);
- edid = drm_get_edid(connector, - intel_gmbus_get_adapter(dev_priv, - intel_hdmi->ddc_bus)); + i2c = intel_gmbus_get_adapter(dev_priv, intel_hdmi->ddc_bus); + + edid = drm_get_edid(connector, i2c); + + if (!edid && !intel_gmbus_is_forced_bit(i2c)) { + DRM_DEBUG_KMS("HDMI GMBUS EDID read failed, retry using GPIO bit-banging\n"); + intel_gmbus_force_bit(i2c, true); + edid = drm_get_edid(connector, i2c); + intel_gmbus_force_bit(i2c, false); + }
intel_hdmi_dp_dual_mode_detect(connector, edid != NULL);