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drm/bridge: it6505: fix HDCP Bstatus check

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[ Upstream commit 0fd2ff47d8c207fa3173661de04bb9e8201c0ad2 ]

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@linaro.org>
Signed-off-by: Hermes Wu <hermes.wu@ite.com.tw>
Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20241230-v7-upstream-v7-5-e0fdd4844703@ite.corp-partner.google.com
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Hermes Wu
2024-12-30 18:51:23 +08:00
committed by Greg Kroah-Hartman
parent 3a047075b4
commit 5d88251a8b
1 changed files with 9 additions and 3 deletions
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drivers/gpu/drm/bridge/ite-it6505.c
+9 -3
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@@ -2312,14 +2312,20 @@ 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);