Donate to e Foundation | Murena handsets with /e/OS | Own a part of Murena! Learn more

Commit 791a98dd authored by Ramalingam C's avatar Ramalingam C Committed by Sean Paul
Browse files

drm/i915: Detect panel's hdcp capability 



DP HDCP1.4 spec mandates that An can be written to panel only after
detecting the panel's hdcp capability.

For DP 0th Bit of Bcaps register indicates the panel's hdcp capability
For HDMI valid BKSV indicates the panel's hdcp capability.

For HDMI it is optional to detect the panel's hdcp capability before
An Write.

v2:
  Added comments explaining the need for action [Seanpaul].
  Made panel's hdcp capability detection optional for hdmi [Seanpaul].
  Defined a func for reading bcaps for DP [Seanpaul].

v3:
  Removed the NULL initialization [Seanpaul].

Signed-off-by: default avatarRamalingam C <ramalingam.c@intel.com>
Reviewed-by: default avatarSean Paul <seanpaul@chromium.org>
Signed-off-by: default avatarSean Paul <seanpaul@chromium.org>
Link: https://patchwork.freedesktop.org/patch/msgid/1517609350-10698-7-git-send-email-ramalingam.c@intel.com
parent 7ee57988

drivers/gpu/drm/i915/intel_dp.c

+35 −4
Original line number Diff line number Diff line
@@ -5084,17 +5084,32 @@ static int intel_dp_hdcp_read_bstatus(struct intel_digital_port *intel_dig_port, 
}



static

int intel_dp_hdcp_repeater_present(struct intel_digital_port *intel_dig_port,

				   bool *repeater_present)

int intel_dp_hdcp_read_bcaps(struct intel_digital_port *intel_dig_port,

			     u8 *bcaps)

{

	ssize_t ret;

	u8 bcaps;



	ret = drm_dp_dpcd_read(&intel_dig_port->dp.aux, DP_AUX_HDCP_BCAPS,

			       &bcaps, 1);

			       bcaps, 1);

	if (ret != 1) {

		DRM_ERROR("Read bcaps from DP/AUX failed (%zd)\n", ret);

		return ret >= 0 ? -EIO : ret;

	}



	return 0;

}



static

int intel_dp_hdcp_repeater_present(struct intel_digital_port *intel_dig_port,

				   bool *repeater_present)

{

	ssize_t ret;

	u8 bcaps;



	ret = intel_dp_hdcp_read_bcaps(intel_dig_port, &bcaps);

	if (ret)

		return ret;



	*repeater_present = bcaps & DP_BCAPS_REPEATER_PRESENT;

	return 0;

}
@@ -5195,6 +5210,21 @@ bool intel_dp_hdcp_check_link(struct intel_digital_port *intel_dig_port) 
	return !(bstatus & (DP_BSTATUS_LINK_FAILURE | DP_BSTATUS_REAUTH_REQ));

}



static

int intel_dp_hdcp_capable(struct intel_digital_port *intel_dig_port,

			  bool *hdcp_capable)

{

	ssize_t ret;

	u8 bcaps;



	ret = intel_dp_hdcp_read_bcaps(intel_dig_port, &bcaps);

	if (ret)

		return ret;



	*hdcp_capable = bcaps & DP_BCAPS_HDCP_CAPABLE;

	return 0;

}



static const struct intel_hdcp_shim intel_dp_hdcp_shim = {

	.write_an_aksv = intel_dp_hdcp_write_an_aksv,

	.read_bksv = intel_dp_hdcp_read_bksv,
@@ -5206,6 +5236,7 @@ static const struct intel_hdcp_shim intel_dp_hdcp_shim = { 
	.read_v_prime_part = intel_dp_hdcp_read_v_prime_part,

	.toggle_signalling = intel_dp_hdcp_toggle_signalling,

	.check_link = intel_dp_hdcp_check_link,

	.hdcp_capable = intel_dp_hdcp_capable,

};



static void intel_edp_panel_vdd_sanitize(struct intel_dp *intel_dp)

drivers/gpu/drm/i915/intel_drv.h

+4 −0
Original line number Diff line number Diff line
@@ -369,6 +369,10 @@ struct intel_hdcp_shim { 


	/* Ensures the link is still protected */

	bool (*check_link)(struct intel_digital_port *intel_dig_port);



	/* Detects panel's hdcp capability. This is optional for HDMI. */

	int (*hdcp_capable)(struct intel_digital_port *intel_dig_port,

			    bool *hdcp_capable);

};



struct intel_connector {

drivers/gpu/drm/i915/intel_hdcp.c

+17 −1
Original line number Diff line number Diff line
@@ -414,12 +414,28 @@ static int intel_hdcp_auth(struct intel_digital_port *intel_dig_port, 
		u32 reg;

		u8 shim[DRM_HDCP_RI_LEN];

	} ri;

	bool repeater_present;

	bool repeater_present, hdcp_capable;



	dev_priv = intel_dig_port->base.base.dev->dev_private;



	port = intel_dig_port->base.port;



	/*

	 * Detects whether the display is HDCP capable. Although we check for

	 * valid Bksv below, the HDCP over DP spec requires that we check

	 * whether the display supports HDCP before we write An. For HDMI

	 * displays, this is not necessary.

	 */

	if (shim->hdcp_capable) {

		ret = shim->hdcp_capable(intel_dig_port, &hdcp_capable);

		if (ret)

			return ret;

		if (!hdcp_capable) {

			DRM_ERROR("Panel is not HDCP capable\n");

			return -EINVAL;

		}

	}



	/* Initialize An with 2 random values and acquire it */

	for (i = 0; i < 2; i++)

		I915_WRITE(PORT_HDCP_ANINIT(port), get_random_u32());