From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Greg Kroah-Hartman , alan@lxorguk.ukuu.org.uk, Niels Ole Salscheider , Alex Deucher Subject: [ 077/221] drm/radeon: Properly handle DDC probe for DP bridges Date: Tue, 15 Jan 2013 10:50:04 -0800 Message-Id: <20130115185003.620291210@linuxfoundation.org> In-Reply-To: <20130115184958.025580322@linuxfoundation.org> References: <20130115184958.025580322@linuxfoundation.org> Sender: linux-kernel-owner@vger.kernel.org List-ID: 3.7-stable review patch. If anyone has any objections, please let me know. ------------------ From: Niels Ole Salscheider commit 0a9069d34918659bc8a89e21e69e60b2b83291a3 upstream. DDC information can be accessed using AUX CH Fixes failure to probe monitors on some systems with DP bridge chips. agd5f: minor fixes Signed-off-by: Niels Ole Salscheider Signed-off-by: Alex Deucher Signed-off-by: Greg Kroah-Hartman --- drivers/gpu/drm/radeon/radeon_connectors.c | 10 ++++++---- drivers/gpu/drm/radeon/radeon_display.c | 13 +++++++++---- drivers/gpu/drm/radeon/radeon_i2c.c | 10 ++++++++-- drivers/gpu/drm/radeon/radeon_mode.h | 2 +- 4 files changed, 24 insertions(+), 11 deletions(-) --- a/drivers/gpu/drm/radeon/radeon_connectors.c +++ b/drivers/gpu/drm/radeon/radeon_connectors.c @@ -741,7 +741,7 @@ radeon_vga_detect(struct drm_connector * ret = connector_status_disconnected; if (radeon_connector->ddc_bus) - dret = radeon_ddc_probe(radeon_connector); + dret = radeon_ddc_probe(radeon_connector, false); if (dret) { radeon_connector->detected_by_load = false; if (radeon_connector->edid) { @@ -947,7 +947,7 @@ radeon_dvi_detect(struct drm_connector * return connector->status; if (radeon_connector->ddc_bus) - dret = radeon_ddc_probe(radeon_connector); + dret = radeon_ddc_probe(radeon_connector, false); if (dret) { radeon_connector->detected_by_load = false; if (radeon_connector->edid) { @@ -1401,7 +1401,8 @@ radeon_dp_detect(struct drm_connector *c if (encoder) { /* setup ddc on the bridge */ radeon_atom_ext_encoder_setup_ddc(encoder); - if (radeon_ddc_probe(radeon_connector)) /* try DDC */ + /* bridge chips are always aux */ + if (radeon_ddc_probe(radeon_connector, true)) /* try DDC */ ret = connector_status_connected; else if (radeon_connector->dac_load_detect) { /* try load detection */ struct drm_encoder_helper_funcs *encoder_funcs = encoder->helper_private; @@ -1419,7 +1420,8 @@ radeon_dp_detect(struct drm_connector *c if (radeon_dp_getdpcd(radeon_connector)) ret = connector_status_connected; } else { - if (radeon_ddc_probe(radeon_connector)) + /* try non-aux ddc (DP to DVI/HMDI/etc. adapter) */ + if (radeon_ddc_probe(radeon_connector, false)) ret = connector_status_connected; } } --- a/drivers/gpu/drm/radeon/radeon_display.c +++ b/drivers/gpu/drm/radeon/radeon_display.c @@ -695,10 +695,15 @@ int radeon_ddc_get_modes(struct radeon_c if (radeon_connector->router.ddc_valid) radeon_router_select_ddc_port(radeon_connector); - if ((radeon_connector->base.connector_type == DRM_MODE_CONNECTOR_DisplayPort) || - (radeon_connector->base.connector_type == DRM_MODE_CONNECTOR_eDP) || - (radeon_connector_encoder_get_dp_bridge_encoder_id(&radeon_connector->base) != - ENCODER_OBJECT_ID_NONE)) { + if (radeon_connector_encoder_get_dp_bridge_encoder_id(&radeon_connector->base) != + ENCODER_OBJECT_ID_NONE) { + struct radeon_connector_atom_dig *dig = radeon_connector->con_priv; + + if (dig->dp_i2c_bus) + radeon_connector->edid = drm_get_edid(&radeon_connector->base, + &dig->dp_i2c_bus->adapter); + } else if ((radeon_connector->base.connector_type == DRM_MODE_CONNECTOR_DisplayPort) || + (radeon_connector->base.connector_type == DRM_MODE_CONNECTOR_eDP)) { struct radeon_connector_atom_dig *dig = radeon_connector->con_priv; if ((dig->dp_sink_type == CONNECTOR_OBJECT_ID_DISPLAYPORT || --- a/drivers/gpu/drm/radeon/radeon_i2c.c +++ b/drivers/gpu/drm/radeon/radeon_i2c.c @@ -39,7 +39,7 @@ extern u32 radeon_atom_hw_i2c_func(struc * radeon_ddc_probe * */ -bool radeon_ddc_probe(struct radeon_connector *radeon_connector) +bool radeon_ddc_probe(struct radeon_connector *radeon_connector, bool use_aux) { u8 out = 0x0; u8 buf[8]; @@ -63,7 +63,13 @@ bool radeon_ddc_probe(struct radeon_conn if (radeon_connector->router.ddc_valid) radeon_router_select_ddc_port(radeon_connector); - ret = i2c_transfer(&radeon_connector->ddc_bus->adapter, msgs, 2); + if (use_aux) { + struct radeon_connector_atom_dig *dig = radeon_connector->con_priv; + ret = i2c_transfer(&dig->dp_i2c_bus->adapter, msgs, 2); + } else { + ret = i2c_transfer(&radeon_connector->ddc_bus->adapter, msgs, 2); + } + if (ret != 2) /* Couldn't find an accessible DDC on this connector */ return false; --- a/drivers/gpu/drm/radeon/radeon_mode.h +++ b/drivers/gpu/drm/radeon/radeon_mode.h @@ -559,7 +559,7 @@ extern void radeon_i2c_put_byte(struct r u8 val); extern void radeon_router_select_ddc_port(struct radeon_connector *radeon_connector); extern void radeon_router_select_cd_port(struct radeon_connector *radeon_connector); -extern bool radeon_ddc_probe(struct radeon_connector *radeon_connector); +extern bool radeon_ddc_probe(struct radeon_connector *radeon_connector, bool use_aux); extern int radeon_ddc_get_modes(struct radeon_connector *radeon_connector); extern struct drm_encoder *radeon_best_encoder(struct drm_connector *connector);