On Wed, Jun 27, 2018 at 02:09:59PM +0530, Ramalingam C wrote:
> For reusability purpose, this patch implements the hdcp1.4 bksv's
> read and validation as a functions.
>
> For detecting the HDMI panel's HDCP capability this fucntions will be
> used.
>
> v2:
> Rebased.
> v3:
> No Changes.
> v4:
> inline tag is removed with modified error msg.
> v5:
> No Changes.
>
> Signed-off-by: Ramalingam C <ramalingam.c@xxxxxxxxx>
Reviewed-by: Sean Paul <seanpaul@xxxxxxxxxxxx>
> ---
> drivers/gpu/drm/i915/intel_hdcp.c | 37 +++++++++++++++++++++++++------------
> 1 file changed, 25 insertions(+), 12 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/intel_hdcp.c b/drivers/gpu/drm/i915/intel_hdcp.c
> index 4bff74b3bed0..32a1a3f39b65 100644
> --- a/drivers/gpu/drm/i915/intel_hdcp.c
> +++ b/drivers/gpu/drm/i915/intel_hdcp.c
> @@ -400,6 +400,28 @@ int intel_hdcp_validate_v_prime(struct intel_digital_port *intel_dig_port,
> return 0;
> }
>
> +static
> +int intel_hdcp_read_valid_bksv(struct intel_digital_port *intel_dig_port,
> + const struct intel_hdcp_shim *shim, u8 *bksv)
> +{
> + int ret, i, tries = 2;
> +
> + /* HDCP spec states that we must retry the bksv if it is invalid */
> + for (i = 0; i < tries; i++) {
> + ret = shim->read_bksv(intel_dig_port, bksv);
> + if (ret)
> + return ret;
> + if (intel_hdcp_is_ksv_valid(bksv))
> + break;
> + }
> + if (i == tries) {
> + DRM_ERROR("Bksv is invalid\n");
> + return -ENODEV;
> + }
> +
> + return 0;
> +}
> +
> /* Implements Part 2 of the HDCP authorization procedure */
> static
> int intel_hdcp_auth_downstream(struct intel_digital_port *intel_dig_port,
> @@ -533,18 +555,9 @@ static int intel_hdcp_auth(struct intel_digital_port *intel_dig_port,
>
> memset(&bksv, 0, sizeof(bksv));
>
> - /* HDCP spec states that we must retry the bksv if it is invalid */
> - for (i = 0; i < tries; i++) {
> - ret = shim->read_bksv(intel_dig_port, bksv.shim);
> - if (ret)
> - return ret;
> - if (intel_hdcp_is_ksv_valid(bksv.shim))
> - break;
> - }
> - if (i == tries) {
> - DRM_ERROR("HDCP failed, Bksv is invalid\n");
> - return -ENODEV;
> - }
> + ret = intel_hdcp_read_valid_bksv(intel_dig_port, shim, bksv.shim);
> + if (ret < 0)
> + return ret;
>
> I915_WRITE(PORT_HDCP_BKSVLO(port), bksv.reg[0]);
> I915_WRITE(PORT_HDCP_BKSVHI(port), bksv.reg[1]);
> --
> 2.7.4
>
> _______________________________________________
> Intel-gfx mailing list
> Intel-gfx@xxxxxxxxxxxxxxxxxxxxx
> https://lists.freedesktop.org/mailman/listinfo/intel-gfx
--
Sean Paul, Software Engineer, Google / Chromium OS
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