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drm/i915: Pullout the bksv read and validation 

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.
v6:
  No Changes.
v7:
  Realigned the code.

Signed-off-by: Ramalingam C <ramalingam.c@intel.com>
Reviewed-by: Sean Paul <seanpaul@chromium.org>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: https://patchwork.freedesktop.org/patch/msgid/1540286550-20399-2-git-send-email-ramalingam.c@intel.com
This commit is contained in:
Ramalingam C 2018-10-23 14:52:27 +05:30 committed by Daniel Vetter
parent fbffc5a3b8
commit f106d1005a
1 changed files with 38 additions and 24 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

62
drivers/gpu/drm/i915/intel_hdcp.c
View File

@ -16,6 +16,41 @@
#define KEY_LOAD_TRIES 5
static
bool intel_hdcp_is_ksv_valid(u8 *ksv)
{
int i, ones = 0;
/* KSV has 20 1's and 20 0's */
for (i = 0; i < DRM_HDCP_KSV_LEN; i++)
ones += hweight8(ksv[i]);
if (ones != 20)
return false;
return true;
}
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;
}
static int intel_hdcp_poll_ksv_fifo(struct intel_digital_port *intel_dig_port,
const struct intel_hdcp_shim *shim)
{
@ -167,18 +202,6 @@ u32 intel_hdcp_get_repeater_ctl(struct intel_digital_port *intel_dig_port)
return -EINVAL;
}
static
bool intel_hdcp_is_ksv_valid(u8 *ksv)
{
int i, ones = 0;
/* KSV has 20 1's and 20 0's */
for (i = 0; i < DRM_HDCP_KSV_LEN; i++)
ones += hweight8(ksv[i]);
if (ones != 20)
return false;
return true;
}
static
int intel_hdcp_validate_v_prime(struct intel_digital_port *intel_dig_port,
const struct intel_hdcp_shim *shim,
@ -527,18 +550,9 @@ 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]);