[PATCH v4 08/11] drm/bridge: it6505: fix HDCP KSV list did not read correctly.
AngeloGioacchino Del Regno
angelogioacchino.delregno at collabora.com
Thu Sep 26 08:10:41 UTC 2024
Il 26/09/24 09:50, Hermes Wu ha scritto:
> From: Hermes Wu <Hermes.wu at ite.com.tw>
>
> When running the HDCP CTS test on UNIGRAF DPR-100.
> KSV list must be read from DPCD with 5 byte boundary.
>
> The original aux operation using AUX_NATIVE_READ can not read back the
> KSV list correctly.
> Change to CMD_AUX_GET_KSV_LIST operaction.
>
>
> Fixes: b5c84a9edcd4 ("drm/bridge: add it6505 driver")
> Signed-off-by: Hermes Wu <Hermes.wu at ite.com.tw>
> ---
> drivers/gpu/drm/bridge/ite-it6505.c | 46 +++++++++++++++++++++--------
> 1 file changed, 34 insertions(+), 12 deletions(-)
>
> diff --git a/drivers/gpu/drm/bridge/ite-it6505.c b/drivers/gpu/drm/bridge/ite-it6505.c
> index 82986f28f653..143d58ed1b0e 100644
> --- a/drivers/gpu/drm/bridge/ite-it6505.c
> +++ b/drivers/gpu/drm/bridge/ite-it6505.c
> @@ -1188,6 +1188,35 @@ 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)
> +{
> + int i, request_size, ret;
> + struct device *dev = it6505->dev;
> + enum aux_cmd_reply reply;
struct device *dev = it6505->dev;
enum aux_cmd_reply reply;
int request_size, ret;
int i = 0;
> +
> + for (i = 0; i < len; ) {
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)
Add braces to this loop, otherwise if DRM_DEV_DEBUG_DRIVER() suddenly becomes
empty (because of some configuration option in the future, etc) you'll get build
breakages.
> + 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;
> @@ -1969,7 +1998,7 @@ 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));
> @@ -1994,18 +2023,11 @@ 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];
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