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drm/bridge: it6505: fix HDCP CTS KSV list wait timer

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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@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-v7-9-e0fdd4844703@ite.corp-partner.google.com
This commit is contained in:
Hermes Wu
2025-01-03 20:24:32 +02:00
committed by Dmitry Baryshkov
parent 0989c02c7a
commit 9f9eef9ec1
1 changed files with 10 additions and 10 deletions
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drivers/gpu/drm/bridge/ite-it6505.c
+10 -10
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@@ -2096,12 +2096,13 @@ 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;
@@ -2110,13 +2111,12 @@ 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);