Commit 0fd2ff47 authored by Hermes Wu's avatar Hermes Wu Committed by Dmitry Baryshkov
Browse files

drm/bridge: it6505: fix HDCP Bstatus check 



When HDCP is activated,
a DisplayPort source receiving CP_IRQ from the sink
shall check Bstatus from DPCD and process the corresponding value

Reviewed-by: default avatarDmitry Baryshkov <dmitry.baryshkov@linaro.org>
Signed-off-by: default avatarHermes Wu <hermes.wu@ite.com.tw>
Reviewed-by: default avatarAngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Signed-off-by: default avatarDmitry Baryshkov <dmitry.baryshkov@linaro.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20241230-v7-upstream-v7-5-e0fdd4844703@ite.corp-partner.google.com
parent 85597bc0

drivers/gpu/drm/bridge/ite-it6505.c

+9 −3
Original line number Diff line number Diff line
@@ -2323,14 +2323,20 @@ static int it6505_process_hpd_irq(struct it6505 *it6505) 
	DRM_DEV_DEBUG_DRIVER(dev, "dp_irq_vector = 0x%02x", dp_irq_vector);



	if (dp_irq_vector & DP_CP_IRQ) {

		it6505_set_bits(it6505, REG_HDCP_TRIGGER, HDCP_TRIGGER_CPIRQ,

				HDCP_TRIGGER_CPIRQ);



		bstatus = it6505_dpcd_read(it6505, DP_AUX_HDCP_BSTATUS);

		if (bstatus < 0)

			return bstatus;



		DRM_DEV_DEBUG_DRIVER(dev, "Bstatus = 0x%02x", bstatus);



		/*Check BSTATUS when recive CP_IRQ */

		if (bstatus & DP_BSTATUS_R0_PRIME_READY &&

		    it6505->hdcp_status == HDCP_AUTH_GOING)

			it6505_set_bits(it6505, REG_HDCP_TRIGGER, HDCP_TRIGGER_CPIRQ,

					HDCP_TRIGGER_CPIRQ);

		else if (bstatus & (DP_BSTATUS_REAUTH_REQ | DP_BSTATUS_LINK_FAILURE) &&

			 it6505->hdcp_status == HDCP_AUTH_DONE)

			it6505_start_hdcp(it6505);

	}



	ret = drm_dp_dpcd_read_link_status(&it6505->aux, link_status);