mirrors/linux
1
0
Fork 0
mirror of https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git synced 2026-05-04 00:15:49 -04:00
Code Issues Packages Projects Releases Wiki Activity

drm/bridge: it6505: fix HDCP CTS KSV list read with UNIGRAF DPR-100.

Browse Source 
When running the HDCP CTS test with UNIGRAF DPR-100.
KSV list must be read from DP_AUX_HDCP_KSV_FIFO in an AUX request,
and can not separate with multiple read requests.

The AUX operation command "CMD_AUX_GET_KSV_LIST" reads the KSV list
with AUX FIFO and is able to read DP_AUX_HDCP_KSV_FIFO in an AUX request.

Add it6505_get_ksvlist() which uses CMD_AUX_GET_KSV_LIST operation
to read the KSV list.

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-v7-7-e0fdd4844703@ite.corp-partner.google.com
This commit is contained in:
Hermes Wu
2024-12-30 18:51:25 +08:00
committed by Dmitry Baryshkov
parent 8c01b0bae2
commit aa97239300
1 changed files with 36 additions and 12 deletions
Download Patch File Download Diff File Expand all files Collapse all files

48
drivers/gpu/drm/bridge/ite-it6505.c
View File

@@ -1189,6 +1189,37 @@ static int it6505_get_edid_block(void *data, u8 *buf, unsigned int block,
return 0;
}
static int it6505_get_ksvlist(struct it6505 *it6505, u8 *buf, size_t len)
{
struct device *dev = it6505->dev;
enum aux_cmd_reply reply;
int request_size, ret;
int i = 0;
do {
request_size = min_t(int, (int)len - i, 15);
ret = it6505_aux_do_transfer(it6505, CMD_AUX_GET_KSV_LIST,
DP_AUX_HDCP_KSV_FIFO,
buf + i, request_size, &reply);
DRM_DEV_DEBUG_DRIVER(dev, "request_size = %d, ret =%d", request_size, ret);
if (ret < 0)
return ret;
i += request_size;
} while (i < len);
DRM_DEV_DEBUG_DRIVER(dev, "ksv read cnt = %d down_stream_cnt=%d ", i, i / 5);
for (i = 0 ; i < len; i += 5) {
DRM_DEV_DEBUG_DRIVER(dev, "ksv[%d] = %02X%02X%02X%02X%02X",
i / 5, buf[i], buf[i + 1], buf[i + 2], buf[i + 3], buf[i + 4]);
}
return len;
}
static void it6505_variable_config(struct it6505 *it6505)
{
it6505->link_rate_bw_code = HBR;
@@ -1970,7 +2001,7 @@ static int it6505_setup_sha1_input(struct it6505 *it6505, u8 *sha1_input)
{
struct device *dev = it6505->dev;
u8 binfo[2];
int down_stream_count, i, err, msg_count = 0;
int down_stream_count, err, msg_count = 0;
err = it6505_get_dpcd(it6505, DP_AUX_HDCP_BINFO, binfo,
ARRAY_SIZE(binfo));
@@ -1995,18 +2026,11 @@ static int it6505_setup_sha1_input(struct it6505 *it6505, u8 *sha1_input)
down_stream_count);
return 0;
}
err = it6505_get_ksvlist(it6505, sha1_input, down_stream_count * 5);
if (err < 0)
return err;
for (i = 0; i < down_stream_count; i++) {
err = it6505_get_dpcd(it6505, DP_AUX_HDCP_KSV_FIFO +
(i % 3) * DRM_HDCP_KSV_LEN,
sha1_input + msg_count,
DRM_HDCP_KSV_LEN);
if (err < 0)
return err;
msg_count += 5;
}
msg_count += down_stream_count * 5;
it6505->hdcp_down_stream_count = down_stream_count;
sha1_input[msg_count++] = binfo[0];