linux-kernel - [PATCH v7 05/10] drm/bridge: it6505: fix HDCP Bstatus check

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Message-Id: <20241104-v7-upstream-v7-5-8b71fd0f1d2d@ite.com.tw>
Date: Mon, 04 Nov 2024 14:43:35 +0800
From: Hermes Wu via B4 Relay <devnull+Hermes.wu.ite.com.tw@...nel.org>
To: Andrzej Hajda <andrzej.hajda@...el.com>, 
 Neil Armstrong <neil.armstrong@...aro.org>, Robert Foss <rfoss@...nel.org>, 
 Laurent Pinchart <Laurent.pinchart@...asonboard.com>, 
 Jonas Karlman <jonas@...boo.se>, Jernej Skrabec <jernej.skrabec@...il.com>, 
 Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>, 
 Maxime Ripard <mripard@...nel.org>, Thomas Zimmermann <tzimmermann@...e.de>, 
 David Airlie <airlied@...il.com>, Simona Vetter <simona@...ll.ch>, 
 AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>, 
 Hermes Wu <hermes.wu@....com.tw>
Cc: dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org, 
 Pin-yen Lin <treapking@...omium.org>, 
 Kenneth Hung <Kenneth.Hung@....com.tw>, Pet Weng <Pet.Weng@....com.tw>, 
 Hermes Wu <Hermes.wu@....com.tw>, 
 Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
Subject: [PATCH v7 05/10] drm/bridge: it6505: fix HDCP Bstatus check

From: Hermes Wu <Hermes.wu@....com.tw>

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: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
Signed-off-by: Hermes Wu <hermes.wu@....com.tw>
---
 drivers/gpu/drm/bridge/ite-it6505.c | 12 +++++++++---
 1 file changed, 9 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/bridge/ite-it6505.c b/drivers/gpu/drm/bridge/ite-it6505.c
index 9a90a36d0421422038b04ad00b2cb2e326a9cab4..760eab0b868874f96ccd4d5ec3e2f2d4ffb1e41c 100644
--- a/drivers/gpu/drm/bridge/ite-it6505.c
+++ b/drivers/gpu/drm/bridge/ite-it6505.c
@@ -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);

-- 
2.34.1