[Intel-gfx] [PATCH v4 39/41] drm/i915: Implement the HDCP2.2 support for HDMI
Daniel Vetter
daniel at ffwll.ch
Thu May 31 07:24:06 UTC 2018
On Mon, May 21, 2018 at 06:23:58PM +0530, Ramalingam C wrote:
> Implements the HDMI adaptation specific HDCP2.2 operations.
>
> Basically these are DDC read and write for authenticating through
> HDCP2.2 messages.
>
> v2:
> Rebased.
> v3:
> No Changes.
> v4:
> No more special handling of Gmbus burst read for AKE_SEND_CERT.
> Style fixed with few naming. [Uma]
> %s/PARING/PAIRING
>
> Signed-off-by: Ramalingam C <ramalingam.c at intel.com>
> ---
> drivers/gpu/drm/i915/intel_hdmi.c | 186 ++++++++++++++++++++++++++++++++++++++
> 1 file changed, 186 insertions(+)
>
> diff --git a/drivers/gpu/drm/i915/intel_hdmi.c b/drivers/gpu/drm/i915/intel_hdmi.c
> index a5cc73101acb..042205e57e42 100644
> --- a/drivers/gpu/drm/i915/intel_hdmi.c
> +++ b/drivers/gpu/drm/i915/intel_hdmi.c
> @@ -30,6 +30,7 @@
> #include <linux/slab.h>
> #include <linux/delay.h>
> #include <linux/hdmi.h>
> +#include <linux/mei_hdcp.h>
> #include <drm/drmP.h>
> #include <drm/drm_atomic_helper.h>
> #include <drm/drm_crtc.h>
> @@ -1106,6 +1107,186 @@ bool intel_hdmi_hdcp_check_link(struct intel_digital_port *intel_dig_port)
> return true;
> }
>
> +static
> +int intel_hdmi_hdcp2_read_rx_status(struct intel_digital_port *intel_dig_port,
> + uint8_t *rx_status)
> +{
> + return intel_hdmi_hdcp_read(intel_dig_port,
> + HDCP_2_2_HDMI_REG_RXSTATUS_OFFSET,
> + rx_status,
> + HDCP_2_2_HDMI_RXSTATUS_LEN);
> +}
> +
> +static inline
> +int intel_hdmi_hdcp2_timeout_for_msg(uint8_t msg_id, bool is_paired)
So at a glance this is the same timeout stuff as for dp. I think this
should be moved out of the low-level callbacks into commont code. Maybe
wrap the low-level callbacks for read/write into small helper functions,
which then also do the timeout handling?
And I think the timeouts and availability checks should be done in the
hdcp flow directly, instead of far away from where the register read/write
is issue. Just to keep the entire register i/o closely together.
-Daniel
> +{
> + int timeout;
> +
> + switch (msg_id) {
> + case HDCP_2_2_AKE_SEND_CERT:
> + timeout = HDCP_2_2_CERT_TIMEOUT;
> + break;
> + case HDCP_2_2_AKE_SEND_HPRIME:
> + if (is_paired)
> + timeout = HDCP_2_2_HPRIME_PAIRED_TIMEOUT;
> + else
> + timeout = HDCP_2_2_HPRIME_NO_PAIRED_TIMEOUT;
> + break;
> + case HDCP_2_2_AKE_SEND_PAIRING_INFO:
> + timeout = HDCP_2_2_PAIRING_TIMEOUT;
> + break;
> + case HDCP_2_2_LC_SEND_LPRIME:
> + timeout = HDCP_2_2_HDMI_LPRIME_TIMEOUT;
> + break;
> + case HDCP_2_2_REP_SEND_RECVID_LIST:
> + timeout = HDCP_2_2_RECVID_LIST_TIMEOUT;
> + break;
> + case HDCP_2_2_REP_STREAM_READY:
> + timeout = HDCP_2_2_STREAM_READY_TIMEOUT;
> + break;
> + default:
> + timeout = -EINVAL;
> + DRM_ERROR("Unsupported msg_id: %d\n", (int)msg_id);
> + }
> +
> + return timeout;
> +}
> +
> +static inline
> +int hdcp2_detect_msg_availability(struct intel_digital_port *intel_digital_port,
> + uint8_t msg_id, bool *msg_ready,
> + ssize_t *msg_sz)
> +{
> + uint8_t rx_status[HDCP_2_2_HDMI_RXSTATUS_LEN];
> + int ret;
> +
> + ret = intel_hdmi_hdcp2_read_rx_status(intel_digital_port, rx_status);
> + if (ret < 0) {
> + DRM_DEBUG_KMS("rx_status read failed. Err %d\n", ret);
> + return ret;
> + }
> +
> + *msg_sz = ((HDCP_2_2_HDMI_RXSTATUS_MSG_SZ_HI(rx_status[1]) << 8) |
> + rx_status[0]);
> +
> + if (msg_id == HDCP_2_2_REP_SEND_RECVID_LIST)
> + *msg_ready = (HDCP_2_2_HDMI_RXSTATUS_READY(rx_status[1]) &&
> + *msg_sz);
> + else
> + *msg_ready = *msg_sz;
> +
> + return 0;
> +}
> +
> +static ssize_t
> +intel_hdmi_hdcp2_wait_for_msg(struct intel_digital_port *intel_dig_port,
> + uint8_t msg_id, bool paired)
> +{
> + bool msg_ready = false;
> + int timeout, ret;
> + ssize_t msg_sz;
> +
> + timeout = intel_hdmi_hdcp2_timeout_for_msg(msg_id, paired);
> + if (timeout < 0)
> + return timeout;
> +
> + ret = __wait_for(ret = hdcp2_detect_msg_availability(intel_dig_port,
> + msg_id, &msg_ready, &msg_sz),
> + !ret && msg_ready && msg_sz, timeout * 1000,
> + 1000, 5 * 1000);
> + if (ret)
> + DRM_ERROR("msg_id: %d, ret: %d, timeout: %d\n",
> + msg_id, ret, timeout);
> +
> + return ret ? ret : msg_sz;
> +}
> +
> +static
> +int intel_hdmi_hdcp2_write_msg(struct intel_digital_port *intel_dig_port,
> + void *buf, size_t size)
> +{
> + unsigned int offset;
> +
> + offset = HDCP_2_2_HDMI_REG_WR_MSG_OFFSET;
> + return intel_hdmi_hdcp_write(intel_dig_port, offset, buf, size);
> +}
> +
> +static
> +int intel_hdmi_hdcp2_read_msg(struct intel_digital_port *intel_dig_port,
> + uint8_t msg_id, void *buf, size_t size)
> +{
> + struct intel_hdmi *hdmi = &intel_dig_port->hdmi;
> + struct intel_hdcp *hdcp = &hdmi->attached_connector->hdcp;
> + unsigned int offset;
> + ssize_t ret;
> +
> + ret = intel_hdmi_hdcp2_wait_for_msg(intel_dig_port, msg_id,
> + hdcp->is_paired);
> + if (ret < 0)
> + return ret;
> +
> + /*
> + * Available msg size should be equal to or lesser than the
> + * available buffer.
> + */
> + if (ret > size) {
> + DRM_DEBUG_KMS("msg_sz(%d) is more than exp size(%d)\n",
> + (int)ret, (int)size);
> + return -1;
> + }
> +
> + offset = HDCP_2_2_HDMI_REG_RD_MSG_OFFSET;
> + ret = intel_hdmi_hdcp_read(intel_dig_port, offset, buf, ret);
> + if (ret)
> + DRM_DEBUG_KMS("Failed to read msg_id: %d(%zd)\n", msg_id, ret);
> +
> + return ret;
> +}
> +
> +static
> +int intel_hdmi_hdcp2_check_link(struct intel_digital_port *intel_dig_port)
> +{
> + uint8_t rx_status[HDCP_2_2_HDMI_RXSTATUS_LEN];
> + int ret;
> +
> + ret = intel_hdmi_hdcp2_read_rx_status(intel_dig_port, rx_status);
> + if (ret)
> + return ret;
> +
> + /*
> + * Re-auth request and Link Integrity Failures are represented by
> + * same bit. i.e reauth_req.
> + */
> + if (HDCP_2_2_HDMI_RXSTATUS_REAUTH_REQ(rx_status[1]))
> + ret = DRM_HDCP_REAUTH_REQUEST;
> + else if (HDCP_2_2_HDMI_RXSTATUS_READY(rx_status[1]))
> + ret = DRM_HDCP_TOPOLOGY_CHANGE;
> +
> + return ret;
> +}
> +
> +static
> +int intel_hdmi_hdcp2_capable(struct intel_digital_port *intel_dig_port,
> + bool *capable)
> +{
> + uint8_t hdcp2_version;
> + int ret;
> +
> + *capable = false;
> + ret = intel_hdmi_hdcp_read(intel_dig_port, HDCP_2_2_HDMI_REG_VER_OFFSET,
> + &hdcp2_version, sizeof(hdcp2_version));
> + if (!ret && hdcp2_version & HDCP_2_2_HDMI_SUPPORT_MASK)
> + *capable = true;
> +
> + return ret;
> +}
> +
> +static
> +enum hdcp_protocol intel_hdmi_hdcp2_protocol(void)
> +{
> + return HDCP_PROTOCOL_HDMI;
> +}
> +
> static const struct intel_hdcp_shim intel_hdmi_hdcp_shim = {
> .write_an_aksv = intel_hdmi_hdcp_write_an_aksv,
> .read_bksv = intel_hdmi_hdcp_read_bksv,
> @@ -1117,6 +1298,11 @@ static const struct intel_hdcp_shim intel_hdmi_hdcp_shim = {
> .read_v_prime_part = intel_hdmi_hdcp_read_v_prime_part,
> .toggle_signalling = intel_hdmi_hdcp_toggle_signalling,
> .check_link = intel_hdmi_hdcp_check_link,
> + .write_2_2_msg = intel_hdmi_hdcp2_write_msg,
> + .read_2_2_msg = intel_hdmi_hdcp2_read_msg,
> + .check_2_2_link = intel_hdmi_hdcp2_check_link,
> + .hdcp_2_2_capable = intel_hdmi_hdcp2_capable,
> + .hdcp_protocol = intel_hdmi_hdcp2_protocol,
> };
>
> static void intel_hdmi_prepare(struct intel_encoder *encoder,
> --
> 2.7.4
>
--
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch
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