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Date: Thu, 10 Nov 2016 21:16:49 +0100
From: Maarten Maathuis <madman2003@...il.com>
To: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc: Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
stable@...r.kernel.org,
Ville Syrjälä <ville.syrjala@...ux.intel.com>,
Jani Nikula <jani.nikula@...el.com>
Subject: Re: [PATCH 4.8 118/138] drm/i915: Clean up DDI DDC/AUX CH sanitation
Hi,
I'm merely curious why this patch isn't also included:
https://cgit.freedesktop.org/drm-intel/commit/?id=e4ab73a13291fc844c9e24d5c347bd95818544d2
When i checked it, it's also not in 4.9-rc git tree.
This patch affects HDMI, and the HDMI connector was "my problem".
@Ville: Is it intentional this one was left out?
Maarten.
On Wed, Nov 9, 2016 at 11:46 AM, Greg Kroah-Hartman
<gregkh@...uxfoundation.org> wrote:
> 4.8-stable review patch. If anyone has any objections, please let me know.
>
> ------------------
>
> From: Ville Syrjälä <ville.syrjala@...ux.intel.com>
>
> commit 0ce140d45a8398b501934ac289aef0eb7f47c596 upstream.
>
> Now that we use the AUX and GMBUS assignment from VBT for all ports,
> let's clean up the sanitization of the port information a bit.
> Previosuly we only did this for port E, and only complained about a
> non-standard assignment for the other ports. But as we know that
> non-standard assignments are a fact of life, let's expand the
> sanitization to all the ports.
>
> v2: Include a commit message, fix up the comments a bit
> v3: Don't clobber other ports if the current port has no alternate aux ch/ddc pin
>
> Cc: Maarten Maathuis <madman2003@...il.com>
> Tested-by: Maarten Maathuis <madman2003@...il.com>
> References: https://bugs.freedesktop.org/show_bug.cgi?id=97877
> Signed-off-by: Ville Syrjälä <ville.syrjala@...ux.intel.com>
> Link: http://patchwork.freedesktop.org/patch/msgid/1476208368-5710-4-git-send-email-ville.syrjala@linux.intel.com
> Reviewed-by: Jim Bride <jim.bride@...ux.intel.com> (v2)
> (cherry picked from commit 9454fa871edf15c20a0371548b3ec0d6d944a498)
> Signed-off-by: Jani Nikula <jani.nikula@...el.com>
> Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
>
> ---
> drivers/gpu/drm/i915/intel_bios.c | 122 +++++++++++++++++++++++---------------
> 1 file changed, 77 insertions(+), 45 deletions(-)
>
> --- a/drivers/gpu/drm/i915/intel_bios.c
> +++ b/drivers/gpu/drm/i915/intel_bios.c
> @@ -1031,6 +1031,77 @@ static u8 translate_iboost(u8 val)
> return mapping[val];
> }
>
> +static void sanitize_ddc_pin(struct drm_i915_private *dev_priv,
> + enum port port)
> +{
> + const struct ddi_vbt_port_info *info =
> + &dev_priv->vbt.ddi_port_info[port];
> + enum port p;
> +
> + if (!info->alternate_ddc_pin)
> + return;
> +
> + for_each_port_masked(p, (1 << port) - 1) {
> + struct ddi_vbt_port_info *i = &dev_priv->vbt.ddi_port_info[p];
> +
> + if (info->alternate_ddc_pin != i->alternate_ddc_pin)
> + continue;
> +
> + DRM_DEBUG_KMS("port %c trying to use the same DDC pin (0x%x) as port %c, "
> + "disabling port %c DVI/HDMI support\n",
> + port_name(p), i->alternate_ddc_pin,
> + port_name(port), port_name(p));
> +
> + /*
> + * If we have multiple ports supposedly sharing the
> + * pin, then dvi/hdmi couldn't exist on the shared
> + * port. Otherwise they share the same ddc bin and
> + * system couldn't communicate with them separately.
> + *
> + * Due to parsing the ports in alphabetical order,
> + * a higher port will always clobber a lower one.
> + */
> + i->supports_dvi = false;
> + i->supports_hdmi = false;
> + i->alternate_ddc_pin = 0;
> + }
> +}
> +
> +static void sanitize_aux_ch(struct drm_i915_private *dev_priv,
> + enum port port)
> +{
> + const struct ddi_vbt_port_info *info =
> + &dev_priv->vbt.ddi_port_info[port];
> + enum port p;
> +
> + if (!info->alternate_aux_channel)
> + return;
> +
> + for_each_port_masked(p, (1 << port) - 1) {
> + struct ddi_vbt_port_info *i = &dev_priv->vbt.ddi_port_info[p];
> +
> + if (info->alternate_aux_channel != i->alternate_aux_channel)
> + continue;
> +
> + DRM_DEBUG_KMS("port %c trying to use the same AUX CH (0x%x) as port %c, "
> + "disabling port %c DP support\n",
> + port_name(p), i->alternate_aux_channel,
> + port_name(port), port_name(p));
> +
> + /*
> + * If we have multiple ports supposedlt sharing the
> + * aux channel, then DP couldn't exist on the shared
> + * port. Otherwise they share the same aux channel
> + * and system couldn't communicate with them separately.
> + *
> + * Due to parsing the ports in alphabetical order,
> + * a higher port will always clobber a lower one.
> + */
> + i->supports_dp = false;
> + i->alternate_aux_channel = 0;
> + }
> +}
> +
> static void parse_ddi_port(struct drm_i915_private *dev_priv, enum port port,
> const struct bdb_header *bdb)
> {
> @@ -1105,54 +1176,15 @@ static void parse_ddi_port(struct drm_i9
> DRM_DEBUG_KMS("Port %c is internal DP\n", port_name(port));
>
> if (is_dvi) {
> - 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");
> - else if (ddc_pin == DDC_PIN_C && port != PORT_C)
> - DRM_DEBUG_KMS("Unexpected DDC pin for port C\n");
> - else if (ddc_pin == DDC_PIN_D && port != PORT_D)
> - DRM_DEBUG_KMS("Unexpected DDC pin for port D\n");
> + info->alternate_ddc_pin = ddc_pin;
> +
> + sanitize_ddc_pin(dev_priv, port);
> }
>
> if (is_dp) {
> - if (port == PORT_E) {
> - info->alternate_aux_channel = aux_channel;
> - /* if DDIE share aux channel with other port, then
> - * DP couldn't exist on the shared port. Otherwise
> - * they share the same aux channel and system
> - * couldn't communicate with them seperately. */
> - if (aux_channel == DP_AUX_A)
> - dev_priv->vbt.ddi_port_info[PORT_A].supports_dp = 0;
> - else if (aux_channel == DP_AUX_B)
> - dev_priv->vbt.ddi_port_info[PORT_B].supports_dp = 0;
> - else if (aux_channel == DP_AUX_C)
> - dev_priv->vbt.ddi_port_info[PORT_C].supports_dp = 0;
> - else if (aux_channel == DP_AUX_D)
> - dev_priv->vbt.ddi_port_info[PORT_D].supports_dp = 0;
> - }
> - else if (aux_channel == DP_AUX_A && port != PORT_A)
> - DRM_DEBUG_KMS("Unexpected AUX channel for port A\n");
> - else if (aux_channel == DP_AUX_B && port != PORT_B)
> - DRM_DEBUG_KMS("Unexpected AUX channel for port B\n");
> - else if (aux_channel == DP_AUX_C && port != PORT_C)
> - DRM_DEBUG_KMS("Unexpected AUX channel for port C\n");
> - else if (aux_channel == DP_AUX_D && port != PORT_D)
> - DRM_DEBUG_KMS("Unexpected AUX channel for port D\n");
> + info->alternate_aux_channel = aux_channel;
> +
> + sanitize_aux_ch(dev_priv, port);
> }
>
> if (bdb->version >= 158) {
>
>
--
Far away from the primal instinct, the song seems to fade away, the
river get wider between your thoughts and the things we do and say.
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