[PATCH v5 06/10] drm/i915/hdcp: Retain hdcp_capable return codes
Rodrigo Vivi
rodrigo.vivi at intel.com
Tue Apr 12 13:36:35 UTC 2022
On Mon, Apr 11, 2022 at 08:47:35PM +0000, Sean Paul wrote:
> From: Sean Paul <seanpaul at chromium.org>
>
> The shim functions return error codes, but they are discarded in
> intel_hdcp.c. This patch plumbs the return codes through so they are
> properly handled.
Reviewed-by: Rodrigo Vivi <rodrigo.vivi at intel.com>
>
> Acked-by: Jani Nikula <jani.nikula at intel.com>
> Signed-off-by: Sean Paul <seanpaul at chromium.org>
> Link: https://patchwork.freedesktop.org/patch/msgid/20210913175747.47456-7-sean@poorly.run #v1
> Link: https://patchwork.freedesktop.org/patch/msgid/20210915203834.1439-7-sean@poorly.run #v2
> Link: https://patchwork.freedesktop.org/patch/msgid/20211001151145.55916-7-sean@poorly.run #v3
> Link: https://patchwork.freedesktop.org/patch/msgid/20211105030434.2828845-7-sean@poorly.run #v4
>
> Changes in v2:
> -None
> Changes in v3:
> -None
> Changes in v4:
> -None
> Changes in v5:
> -None
> ---
> .../drm/i915/display/intel_display_debugfs.c | 9 +++-
> drivers/gpu/drm/i915/display/intel_hdcp.c | 51 ++++++++++---------
> drivers/gpu/drm/i915/display/intel_hdcp.h | 4 +-
> 3 files changed, 37 insertions(+), 27 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/display/intel_display_debugfs.c b/drivers/gpu/drm/i915/display/intel_display_debugfs.c
> index 452d773fd4e3..f18b4bec4dd4 100644
> --- a/drivers/gpu/drm/i915/display/intel_display_debugfs.c
> +++ b/drivers/gpu/drm/i915/display/intel_display_debugfs.c
> @@ -489,6 +489,7 @@ static void intel_panel_info(struct seq_file *m,
> static void intel_hdcp_info(struct seq_file *m,
> struct intel_connector *intel_connector)
> {
> + int ret;
> bool hdcp_cap, hdcp2_cap;
>
> if (!intel_connector->hdcp.shim) {
> @@ -496,8 +497,12 @@ static void intel_hdcp_info(struct seq_file *m,
> goto out;
> }
>
> - hdcp_cap = intel_hdcp_capable(intel_connector);
> - hdcp2_cap = intel_hdcp2_capable(intel_connector);
> + ret = intel_hdcp_capable(intel_connector, &hdcp_cap);
> + if (ret)
> + hdcp_cap = false;
> + ret = intel_hdcp2_capable(intel_connector, &hdcp2_cap);
> + if (ret)
> + hdcp2_cap = false;
>
> if (hdcp_cap)
> seq_puts(m, "HDCP1.4 ");
> diff --git a/drivers/gpu/drm/i915/display/intel_hdcp.c b/drivers/gpu/drm/i915/display/intel_hdcp.c
> index 6bb5a3971ed9..771e94fa8dff 100644
> --- a/drivers/gpu/drm/i915/display/intel_hdcp.c
> +++ b/drivers/gpu/drm/i915/display/intel_hdcp.c
> @@ -154,50 +154,49 @@ int intel_hdcp_read_valid_bksv(struct intel_digital_port *dig_port,
> }
>
> /* Is HDCP1.4 capable on Platform and Sink */
> -bool intel_hdcp_capable(struct intel_connector *connector)
> +int intel_hdcp_capable(struct intel_connector *connector, bool *capable)
> {
> struct intel_digital_port *dig_port = intel_attached_dig_port(connector);
> const struct intel_hdcp_shim *shim = connector->hdcp.shim;
> - bool capable = false;
> u8 bksv[5];
>
> + *capable = false;
> +
> if (!shim)
> - return capable;
> + return 0;
>
> - if (shim->hdcp_capable) {
> - shim->hdcp_capable(dig_port, &capable);
> - } else {
> - if (!intel_hdcp_read_valid_bksv(dig_port, shim, bksv))
> - capable = true;
> - }
> + if (shim->hdcp_capable)
> + return shim->hdcp_capable(dig_port, capable);
> +
> + if (!intel_hdcp_read_valid_bksv(dig_port, shim, bksv))
> + *capable = true;
>
> - return capable;
> + return 0;
> }
>
> /* Is HDCP2.2 capable on Platform and Sink */
> -bool intel_hdcp2_capable(struct intel_connector *connector)
> +int intel_hdcp2_capable(struct intel_connector *connector, bool *capable)
> {
> struct intel_digital_port *dig_port = intel_attached_dig_port(connector);
> struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
> struct intel_hdcp *hdcp = &connector->hdcp;
> - bool capable = false;
> +
> + *capable = false;
>
> /* I915 support for HDCP2.2 */
> if (!hdcp->hdcp2_supported)
> - return false;
> + return 0;
>
> /* MEI interface is solid */
> mutex_lock(&dev_priv->hdcp_comp_mutex);
> if (!dev_priv->hdcp_comp_added || !dev_priv->hdcp_master) {
> mutex_unlock(&dev_priv->hdcp_comp_mutex);
> - return false;
> + return 0;
> }
> mutex_unlock(&dev_priv->hdcp_comp_mutex);
>
> /* Sink's capability for HDCP2.2 */
> - hdcp->shim->hdcp_2_2_capable(dig_port, &capable);
> -
> - return capable;
> + return hdcp->shim->hdcp_2_2_capable(dig_port, capable);
> }
>
> static bool intel_hdcp_in_use(struct drm_i915_private *dev_priv,
> @@ -2332,6 +2331,7 @@ int intel_hdcp_enable(struct intel_connector *connector,
> struct intel_digital_port *dig_port = intel_attached_dig_port(connector);
> struct intel_hdcp *hdcp = &connector->hdcp;
> unsigned long check_link_interval = DRM_HDCP_CHECK_PERIOD_MS;
> + bool capable;
> int ret = -EINVAL;
>
> if (!hdcp->shim)
> @@ -2350,21 +2350,27 @@ int intel_hdcp_enable(struct intel_connector *connector,
> * Considering that HDCP2.2 is more secure than HDCP1.4, If the setup
> * is capable of HDCP2.2, it is preferred to use HDCP2.2.
> */
> - if (intel_hdcp2_capable(connector)) {
> + ret = intel_hdcp2_capable(connector, &capable);
> + if (capable) {
> ret = _intel_hdcp2_enable(connector);
> - if (!ret)
> + if (!ret) {
> check_link_interval = DRM_HDCP2_CHECK_PERIOD_MS;
> + goto out;
> + }
> }
>
> /*
> * When HDCP2.2 fails and Content Type is not Type1, HDCP1.4 will
> * be attempted.
> */
> - if (ret && intel_hdcp_capable(connector) &&
> - hdcp->content_type != DRM_MODE_HDCP_CONTENT_TYPE1) {
> + ret = intel_hdcp_capable(connector, &capable);
> + if (ret)
> + goto out;
> +
> + if (capable && hdcp->content_type != DRM_MODE_HDCP_CONTENT_TYPE1)
> ret = _intel_hdcp_enable(connector);
> - }
>
> +out:
> if (!ret) {
> schedule_delayed_work(&hdcp->check_work, check_link_interval);
> intel_hdcp_update_value(connector,
> @@ -2372,7 +2378,6 @@ int intel_hdcp_enable(struct intel_connector *connector,
> true);
> }
>
> -out:
> mutex_unlock(&dig_port->hdcp_mutex);
> mutex_unlock(&hdcp->mutex);
> return ret;
> diff --git a/drivers/gpu/drm/i915/display/intel_hdcp.h b/drivers/gpu/drm/i915/display/intel_hdcp.h
> index 7c5fd84a7b65..f06f6e5a2b1a 100644
> --- a/drivers/gpu/drm/i915/display/intel_hdcp.h
> +++ b/drivers/gpu/drm/i915/display/intel_hdcp.h
> @@ -33,8 +33,8 @@ void intel_hdcp_update_pipe(struct intel_atomic_state *state,
> const struct intel_crtc_state *crtc_state,
> const struct drm_connector_state *conn_state);
> bool is_hdcp_supported(struct drm_i915_private *dev_priv, enum port port);
> -bool intel_hdcp_capable(struct intel_connector *connector);
> -bool intel_hdcp2_capable(struct intel_connector *connector);
> +int intel_hdcp_capable(struct intel_connector *connector, bool *capable);
> +int intel_hdcp2_capable(struct intel_connector *connector, bool *capable);
> void intel_hdcp_component_init(struct drm_i915_private *dev_priv);
> void intel_hdcp_component_fini(struct drm_i915_private *dev_priv);
> void intel_hdcp_cleanup(struct intel_connector *connector);
> --
> Sean Paul, Software Engineer, Google / Chromium OS
>
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