From: Hermes Wu <hermes.wu@xxxxxxxxxx> [ Upstream commit 9f9eef9ec1a2b57d95a86fe81df758e8253a7766 ] HDCP must disabled encryption and restart authentication after waiting KSV for 5s. The original method uses a counter in a waitting loop that may wait much longer than it is supposed to. Use time_after() for KSV wait timeout. Signed-off-by: Hermes Wu <hermes.wu@xxxxxxxxxx> Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@xxxxxxxxxxxxx> Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@xxxxxxxxxx> Link: https://patchwork.freedesktop.org/patch/msgid/20241230-v7-upstream-v7-9-e0fdd4844703@xxxxxxxxxxxxxxxxxxxxxxxxxxx Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx> --- drivers/gpu/drm/bridge/ite-it6505.c | 20 ++++++++++---------- 1 file changed, 10 insertions(+), 10 deletions(-) diff --git a/drivers/gpu/drm/bridge/ite-it6505.c b/drivers/gpu/drm/bridge/ite-it6505.c index b23e6f663b18f..cedba2a76f014 100644 --- a/drivers/gpu/drm/bridge/ite-it6505.c +++ b/drivers/gpu/drm/bridge/ite-it6505.c @@ -2058,12 +2058,13 @@ static void it6505_hdcp_wait_ksv_list(struct work_struct *work) struct it6505 *it6505 = container_of(work, struct it6505, hdcp_wait_ksv_list); struct device *dev = it6505->dev; - unsigned int timeout = 5000; - u8 bstatus = 0; + u8 bstatus; bool ksv_list_check; + /* 1B-04 wait ksv list for 5s */ + unsigned long timeout = jiffies + + msecs_to_jiffies(5000) + 1; - timeout /= 20; - while (timeout > 0) { + for (;;) { if (!it6505_get_sink_hpd_status(it6505)) return; @@ -2072,13 +2073,12 @@ static void it6505_hdcp_wait_ksv_list(struct work_struct *work) if (bstatus & DP_BSTATUS_READY) break; - msleep(20); - timeout--; - } + if (time_after(jiffies, timeout)) { + DRM_DEV_DEBUG_DRIVER(dev, "KSV list wait timeout"); + goto timeout; + } - if (timeout == 0) { - DRM_DEV_DEBUG_DRIVER(dev, "timeout and ksv list wait failed"); - goto timeout; + msleep(20); } ksv_list_check = it6505_hdcp_part2_ksvlist_check(it6505); -- 2.39.5
