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drm/bridge: it6505: fix HDCP CTS compare V matching

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[ Upstream commit 0989c02c7a5c887c70afeae80c64d0291624e1a7 ]

When HDCP negotiation with a repeater device.
Checking SHA V' matching must retry 3 times before restarting HDCP.

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-v7-8-e0fdd4844703@ite.corp-partner.google.com
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Hermes Wu
2024-12-30 18:51:26 +08:00
committed by Greg Kroah-Hartman
parent 05040e0847
commit 4ebd696fe7
1 changed files with 19 additions and 13 deletions
Download Patch File Download Diff File Expand all files Collapse all files
drivers/gpu/drm/bridge/ite-it6505.c
+19 -13
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@@ -2023,7 +2023,7 @@ static bool it6505_hdcp_part2_ksvlist_check(struct it6505 *it6505)
{
struct device *dev = it6505->dev;
u8 av[5][4], bv[5][4];
int i, err;
int i, err, retry;
i = it6505_setup_sha1_input(it6505, it6505->sha1_input);
if (i <= 0) {
@@ -2032,22 +2032,28 @@ static bool it6505_hdcp_part2_ksvlist_check(struct it6505 *it6505)
}
it6505_sha1_digest(it6505, it6505->sha1_input, i, (u8 *)av);
/*1B-05 V' must retry 3 times */
for (retry = 0; retry < 3; retry++) {
err = it6505_get_dpcd(it6505, DP_AUX_HDCP_V_PRIME(0), (u8 *)bv,
sizeof(bv));
err = it6505_get_dpcd(it6505, DP_AUX_HDCP_V_PRIME(0), (u8 *)bv,
sizeof(bv));
if (err < 0) {
dev_err(dev, "Read V' value Fail %d", retry);
continue;
}
if (err < 0) {
dev_err(dev, "Read V' value Fail");
return false;
for (i = 0; i < 5; i++) {
if (bv[i][3] != av[i][0] || bv[i][2] != av[i][1] ||
av[i][1] != av[i][2] || bv[i][0] != av[i][3])
break;
DRM_DEV_DEBUG_DRIVER(dev, "V' all match!! %d, %d", retry, i);
return true;
}
}
for (i = 0; i < 5; i++)
if (bv[i][3] != av[i][0] || bv[i][2] != av[i][1] ||
bv[i][1] != av[i][2] || bv[i][0] != av[i][3])
return false;
DRM_DEV_DEBUG_DRIVER(dev, "V' all match!!");
return true;
DRM_DEV_DEBUG_DRIVER(dev, "V' NOT match!! %d", retry);
return false;
}
static void it6505_hdcp_wait_ksv_list(struct work_struct *work)