Re: [PATCH 6/6 v3] drm/i915: Enable HDMI on DDI-E

Daniel Vetter
2015-08-12T12:33:23Z

On Wed, Aug 12, 2015 at 06:39:34PM +0800, Xiong Zhang wrote:
> DDI-E doesn't have the correspondent GMBUS pin.
>
> We rely on VBT to tell us which one it being used instead.
>
> The DVI/HDMI on shared port couldn't exist.
>
> This patch isn't tested without hardware wchich has HDMI
> on DDI-E.
>
> v2: fix trailing whitespace
> v3: WARN() take place of BUG()

I asked for MISSING_CASE, not WARN.
-Daniel

>
> Signed-off-by: Xiong Zhang <xiong.y.zhang@intel.com>
> Reviewed-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
> ---
> drivers/gpu/drm/i915/i915_drv.h | 5 +++++
> drivers/gpu/drm/i915/intel_bios.c | 25 +++++++++++++++++++++----
> drivers/gpu/drm/i915/intel_hdmi.c | 18 ++++++++++++++++++
> 3 files changed, 44 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
> index 6d93334..5d8e7fe 100644
> --- a/drivers/gpu/drm/i915/i915_drv.h
> +++ b/drivers/gpu/drm/i915/i915_drv.h
> @@ -1414,6 +1414,10 @@ enum modeset_restore {
> #define DP_AUX_C 0x20
> #define DP_AUX_D 0x30
>
> +#define DDC_PIN_B 0x05
> +#define DDC_PIN_C 0x04
> +#define DDC_PIN_D 0x06
> +
> struct ddi_vbt_port_info {
> /*
> * This is an index in the HDMI/DVI DDI buffer translation table.
> @@ -1428,6 +1432,7 @@ struct ddi_vbt_port_info {
> uint8_t supports_dp:1;
>
> uint8_t alternate_aux_channel;
> + uint8_t alternate_ddc_pin;
> };
>
> enum psr_lines_to_wait {
> diff --git a/drivers/gpu/drm/i915/intel_bios.c b/drivers/gpu/drm/i915/intel_bios.c
> index 16cdf17..8140531 100644
> --- a/drivers/gpu/drm/i915/intel_bios.c
> +++ b/drivers/gpu/drm/i915/intel_bios.c
> @@ -894,7 +894,7 @@ static void parse_ddi_port(struct drm_i915_private *dev_priv, enum port port,
> uint8_t hdmi_level_shift;
> int i, j;
> bool is_dvi, is_hdmi, is_dp, is_edp, is_crt;
> - uint8_t aux_channel;
> + uint8_t aux_channel, ddc_pin;
> /* 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
> * than one is found. */
> @@ -928,6 +928,7 @@ static void parse_ddi_port(struct drm_i915_private *dev_priv, enum port port,
> return;
>
> aux_channel = child->raw[25];
> + ddc_pin = child->common.ddc_pin;
>
> is_dvi = child->common.device_type & DEVICE_TYPE_TMDS_DVI_SIGNALING;
> is_dp = child->common.device_type & DEVICE_TYPE_DISPLAYPORT_OUTPUT;
> @@ -959,11 +960,27 @@ static void parse_ddi_port(struct drm_i915_private *dev_priv, enum port port,
> DRM_DEBUG_KMS("Port %c is internal DP\n", port_name(port));
>
> if (is_dvi) {
> - if (child->common.ddc_pin == 0x05 && port != PORT_B)
> + if (port == PORT_E) {
> + info->alternate_ddc_pin = ddc_pin;
> + /* if DDIE share ddc pin with other port, then
> + * dvi/hdmi couldn't exist on the shared port.
> + * Otherwise they share the same ddc bin and system
> + * couldn't communicate with them seperately. */
> + if (ddc_pin == DDC_PIN_B) {
> + dev_priv->vbt.ddi_port_info[PORT_B].supports_dvi = 0;
> + dev_priv->vbt.ddi_port_info[PORT_B].supports_hdmi = 0;
> + } else if (ddc_pin == DDC_PIN_C) {
> + dev_priv->vbt.ddi_port_info[PORT_C].supports_dvi = 0;
> + dev_priv->vbt.ddi_port_info[PORT_C].supports_hdmi = 0;
> + } else if (ddc_pin == DDC_PIN_D) {
> + dev_priv->vbt.ddi_port_info[PORT_D].supports_dvi = 0;
> + dev_priv->vbt.ddi_port_info[PORT_D].supports_hdmi = 0;
> + }
> + } else if (ddc_pin == DDC_PIN_B && port != PORT_B)
> DRM_DEBUG_KMS("Unexpected DDC pin for port B\n");
> - if (child->common.ddc_pin == 0x04 && port != PORT_C)
> + else if (ddc_pin == DDC_PIN_C && port != PORT_C)
> DRM_DEBUG_KMS("Unexpected DDC pin for port C\n");
> - if (child->common.ddc_pin == 0x06 && port != PORT_D)
> + else if (ddc_pin == DDC_PIN_D && port != PORT_D)
> DRM_DEBUG_KMS("Unexpected DDC pin for port D\n");
> }
>
> diff --git a/drivers/gpu/drm/i915/intel_hdmi.c b/drivers/gpu/drm/i915/intel_hdmi.c
> index 70bad5b..a4129f2 100644
> --- a/drivers/gpu/drm/i915/intel_hdmi.c
> +++ b/drivers/gpu/drm/i915/intel_hdmi.c
> @@ -1991,6 +1991,24 @@ void intel_hdmi_init_connector(struct intel_digital_port *intel_dig_port,
> intel_hdmi->ddc_bus = GMBUS_PIN_DPD;
> intel_encoder->hpd_pin = HPD_PORT_D;
> break;
> + case PORT_E:
> + /* On SKL PORT E doesn't have seperate GMBUS pin
> + * We rely on VBT to set a proper alternate GMBUS pin. */
> + switch (dev_priv->vbt.ddi_port_info[PORT_E].alternate_ddc_pin) {
> + case DDC_PIN_B:
> + intel_hdmi->ddc_bus = GMBUS_PIN_DPB;
> + break;
> + case DDC_PIN_C:
> + intel_hdmi->ddc_bus = GMBUS_PIN_DPC;
> + break;
> + case DDC_PIN_D:
> + intel_hdmi->ddc_bus = GMBUS_PIN_DPD;
> + break;
> + default:
> + WARN(1, "VBT assign invalid DDC PIN for HDMI on PORT_E.\n");
> + }
> + intel_encoder->hpd_pin = HPD_PORT_E;
> + break;
> case PORT_A:
> intel_encoder->hpd_pin = HPD_PORT_A;
> /* Internal port only for eDP. */
> --
> 2.1.4
>
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--
Daniel Vetter
Software Engineer, Intel Corporation