From: Hermes Wu hermes.wu@ite.com.tw
[ 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-e0fd... Signed-off-by: Sasha Levin sashal@kernel.org --- 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 e6ba2dcc4ad00..e8dac873a92c9 100644 --- a/drivers/gpu/drm/bridge/ite-it6505.c +++ b/drivers/gpu/drm/bridge/ite-it6505.c @@ -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);