RE: [Intel-gfx] [PATCH v6 01/10] drm/hdcp: Add drm_hdcp_atomic_check()

Kandpal, Suraj
2023-03-10T05:30:47Z

>
> From: Sean Paul <seanpaul@chromium.org>
>
> This patch moves the hdcp atomic check from i915 to drm_hdcp so other
> drivers can use it. No functional changes, just cleaned up some of the code
> when moving it over.
>
> Acked-by: Jani Nikula <jani.nikula@intel.com>
> Acked-by: Jani Nikula <jani.nikula@intel.com>
> Reviewed-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
> Reviewed-by: Abhinav Kumar <abhinavk@codeaurora.org>
> Signed-off-by: Sean Paul <seanpaul@chromium.org>
> Signed-off-by: Mark Yacoub <markyacoub@chromium.org>
> Link:
> https://patchwork.freedesktop.org/patch/msgid/20210913175747.47456-2-
> sean@poorly.run #v1
> Link:
> https://patchwork.freedesktop.org/patch/msgid/20210915203834.1439-2-
> sean@poorly.run #v2
> Link:
> https://patchwork.freedesktop.org/patch/msgid/20211001151145.55916-2-
> sean@poorly.run #v3
> Link:
> https://patchwork.freedesktop.org/patch/msgid/20211105030434.2828845-
> 2-sean@poorly.run #v4
> Link:
> https://patchwork.freedesktop.org/patch/msgid/20220411204741.1074308-
> 2-sean@poorly.run #v5
>
> Changes in v2:
> -None
> Changes in v3:
> -None
> Changes in v4:
> -None
> Changes in v5:
> -None
> Changes in V6:
> -Rebase: move helper from drm_hdcp.c to drm_hdcp_helper.c
>
> ---
> drivers/gpu/drm/display/drm_hdcp_helper.c | 69
> +++++++++++++++++++++
> drivers/gpu/drm/i915/display/intel_atomic.c | 4 +-
> drivers/gpu/drm/i915/display/intel_hdcp.c | 47 --------------
> drivers/gpu/drm/i915/display/intel_hdcp.h | 3 -
> include/drm/display/drm_hdcp_helper.h | 3 +
> 5 files changed, 74 insertions(+), 52 deletions(-)
>
> diff --git a/drivers/gpu/drm/display/drm_hdcp_helper.c
> b/drivers/gpu/drm/display/drm_hdcp_helper.c
> index e78999c72bd7..7d910523b05f 100644
> --- a/drivers/gpu/drm/display/drm_hdcp_helper.c
> +++ b/drivers/gpu/drm/display/drm_hdcp_helper.c
> @@ -20,6 +20,7 @@
> #include <drm/drm_property.h>
> #include <drm/drm_mode_object.h>
> #include <drm/drm_connector.h>
> +#include <drm/drm_atomic.h>
>
> static inline void drm_hdcp_print_ksv(const u8 *ksv) { @@ -419,3 +420,71
> @@ void drm_hdcp_update_content_protection(struct drm_connector
> *connector,
> dev-
> >mode_config.content_protection_property);
> }
> EXPORT_SYMBOL(drm_hdcp_update_content_protection);
> +
> +/**
> + * drm_hdcp_atomic_check - Helper for drivers to call during
> +connector->atomic_check
> + *
> + * @state: pointer to the atomic state being checked
> + * @connector: drm_connector on which content protection state needs an
> +update
> + *
> + * This function can be used by display drivers to perform an atomic
> +check on the
> + * hdcp state elements. If hdcp state has changed, this function will
> +set
> + * mode_changed on the crtc driving the connector so it can update its
> +hardware
> + * to match the hdcp state.
> + */
> +void drm_hdcp_atomic_check(struct drm_connector *connector,
> + struct drm_atomic_state *state)
> +{
> + struct drm_connector_state *new_conn_state, *old_conn_state;
> + struct drm_crtc_state *new_crtc_state;
> + u64 old_hdcp, new_hdcp;
> +
> + old_conn_state = drm_atomic_get_old_connector_state(state,
> connector);
> + old_hdcp = old_conn_state->content_protection;
> +
> + new_conn_state = drm_atomic_get_new_connector_state(state,
> connector);
> + new_hdcp = new_conn_state->content_protection;
> +
> + if (!new_conn_state->crtc) {
> + /*
> + * If the connector is being disabled with CP enabled, mark it
> + * desired so it's re-enabled when the connector is brought
> back
> + */
> + if (old_hdcp ==
> DRM_MODE_CONTENT_PROTECTION_ENABLED)
> + new_conn_state->content_protection =
> +
> DRM_MODE_CONTENT_PROTECTION_DESIRED;
> + return;
> + }
> +
> + new_crtc_state =
> + drm_atomic_get_new_crtc_state(state, new_conn_state-
> >crtc);
> + /*
> + * Fix the HDCP uapi content protection state in case of modeset.
> + * FIXME: As per HDCP content protection property uapi doc, an
> uevent()
> + * need to be sent if there is transition from ENABLED->DESIRED.
> + */

Hi Mark,
Is the above comment needed here as drm_hdcp_update_content_protection is
used to change property which sends a uevent making the above comment misleading

Regards,
Suraj Kandpal
> + if (drm_atomic_crtc_needs_modeset(new_crtc_state) &&
> + (old_hdcp == DRM_MODE_CONTENT_PROTECTION_ENABLED &&
> + new_hdcp != DRM_MODE_CONTENT_PROTECTION_UNDESIRED))
> + new_conn_state->content_protection =
> + DRM_MODE_CONTENT_PROTECTION_DESIRED;
> +
> + /*
> + * Nothing to do if content type is unchanged and one of:
> + * - state didn't change
> + * - HDCP was activated since the last commit
> + * - attempting to set to desired while already enabled
> + */
> + if (old_hdcp == new_hdcp ||
> + (old_hdcp == DRM_MODE_CONTENT_PROTECTION_DESIRED &&
> + new_hdcp == DRM_MODE_CONTENT_PROTECTION_ENABLED) ||
> + (old_hdcp == DRM_MODE_CONTENT_PROTECTION_ENABLED &&
> + new_hdcp == DRM_MODE_CONTENT_PROTECTION_DESIRED)) {
> + if (old_conn_state->hdcp_content_type ==
> + new_conn_state->hdcp_content_type)
> + return;
> + }
> +
> + new_crtc_state->mode_changed = true;
> +}
> +EXPORT_SYMBOL(drm_hdcp_atomic_check);
> diff --git a/drivers/gpu/drm/i915/display/intel_atomic.c
> b/drivers/gpu/drm/i915/display/intel_atomic.c
> index 18f0a5ae3bac..8a473199c4bf 100644
> --- a/drivers/gpu/drm/i915/display/intel_atomic.c
> +++ b/drivers/gpu/drm/i915/display/intel_atomic.c
> @@ -32,6 +32,7 @@
> #include <drm/drm_atomic.h>
> #include <drm/drm_atomic_helper.h>
> #include <drm/drm_fourcc.h>
> +#include <drm/display/drm_hdcp_helper.h>
>
> #include "i915_drv.h"
> #include "i915_reg.h"
> @@ -39,7 +40,6 @@
> #include "intel_cdclk.h"
> #include "intel_display_types.h"
> #include "intel_global_state.h"
> -#include "intel_hdcp.h"
> #include "intel_psr.h"
> #include "skl_universal_plane.h"
>
> @@ -123,7 +123,7 @@ int intel_digital_connector_atomic_check(struct
> drm_connector *conn,
> to_intel_digital_connector_state(old_state);
> struct drm_crtc_state *crtc_state;
>
> - intel_hdcp_atomic_check(conn, old_state, new_state);
> + drm_hdcp_atomic_check(conn, state);
>
> if (!new_state->crtc)
> return 0;
> diff --git a/drivers/gpu/drm/i915/display/intel_hdcp.c
> b/drivers/gpu/drm/i915/display/intel_hdcp.c
> index 6406fd487ee5..396d2cef000a 100644
> --- a/drivers/gpu/drm/i915/display/intel_hdcp.c
> +++ b/drivers/gpu/drm/i915/display/intel_hdcp.c
> @@ -2524,53 +2524,6 @@ void intel_hdcp_cleanup(struct intel_connector
> *connector)
> mutex_unlock(&hdcp->mutex);
> }
>
> -void intel_hdcp_atomic_check(struct drm_connector *connector,
> - struct drm_connector_state *old_state,
> - struct drm_connector_state *new_state)
> -{
> - u64 old_cp = old_state->content_protection;
> - u64 new_cp = new_state->content_protection;
> - struct drm_crtc_state *crtc_state;
> -
> - if (!new_state->crtc) {
> - /*
> - * If the connector is being disabled with CP enabled, mark it
> - * desired so it's re-enabled when the connector is brought
> back
> - */
> - if (old_cp ==
> DRM_MODE_CONTENT_PROTECTION_ENABLED)
> - new_state->content_protection =
> -
> DRM_MODE_CONTENT_PROTECTION_DESIRED;
> - return;
> - }
> -
> - crtc_state = drm_atomic_get_new_crtc_state(new_state->state,
> - new_state->crtc);
> - /*
> - * Fix the HDCP uapi content protection state in case of modeset.
> - * FIXME: As per HDCP content protection property uapi doc, an
> uevent()
> - * need to be sent if there is transition from ENABLED->DESIRED.
> - */
> - if (drm_atomic_crtc_needs_modeset(crtc_state) &&
> - (old_cp == DRM_MODE_CONTENT_PROTECTION_ENABLED &&
> - new_cp != DRM_MODE_CONTENT_PROTECTION_UNDESIRED))
> - new_state->content_protection =
> - DRM_MODE_CONTENT_PROTECTION_DESIRED;
> -
> - /*
> - * Nothing to do if the state didn't change, or HDCP was activated
> since
> - * the last commit. And also no change in hdcp content type.
> - */
> - if (old_cp == new_cp ||
> - (old_cp == DRM_MODE_CONTENT_PROTECTION_DESIRED &&
> - new_cp == DRM_MODE_CONTENT_PROTECTION_ENABLED)) {
> - if (old_state->hdcp_content_type ==
> - new_state->hdcp_content_type)
> - return;
> - }
> -
> - crtc_state->mode_changed = true;
> -}
> -
> /* Handles the CP_IRQ raised from the DP HDCP sink */ void
> intel_hdcp_handle_cp_irq(struct intel_connector *connector) { diff --git
> a/drivers/gpu/drm/i915/display/intel_hdcp.h
> b/drivers/gpu/drm/i915/display/intel_hdcp.h
> index 8f53b0c7fe5c..7c5fd84a7b65 100644
> --- a/drivers/gpu/drm/i915/display/intel_hdcp.h
> +++ b/drivers/gpu/drm/i915/display/intel_hdcp.h
> @@ -22,9 +22,6 @@ struct intel_digital_port; enum port; enum transcoder;
>
> -void intel_hdcp_atomic_check(struct drm_connector *connector,
> - struct drm_connector_state *old_state,
> - struct drm_connector_state *new_state);
> int intel_hdcp_init(struct intel_connector *connector,
> struct intel_digital_port *dig_port,
> const struct intel_hdcp_shim *hdcp_shim); diff --git
> a/include/drm/display/drm_hdcp_helper.h
> b/include/drm/display/drm_hdcp_helper.h
> index 8aaf87bf2735..dd02b2e72a50 100644
> --- a/include/drm/display/drm_hdcp_helper.h
> +++ b/include/drm/display/drm_hdcp_helper.h
> @@ -11,6 +11,7 @@
>
> #include <drm/display/drm_hdcp.h>
>
> +struct drm_atomic_state;
> struct drm_device;
> struct drm_connector;
>
> @@ -18,5 +19,7 @@ int drm_hdcp_check_ksvs_revoked(struct drm_device
> *dev, u8 *ksvs, u32 ksv_count) int
> drm_connector_attach_content_protection_property(struct drm_connector
> *connector,
> bool hdcp_content_type);
> void drm_hdcp_update_content_protection(struct drm_connector
> *connector, u64 val);
> +void drm_hdcp_atomic_check(struct drm_connector *connector,
> + struct drm_atomic_state *state);
>
> #endif
> --
> 2.39.0.246.g2a6d74b583-goog