diff mbox series

drm/i915/hdcp: Handle HDCP Line Rekeying for HDCP 1.4

Message ID 20241106093840.847932-1-suraj.kandpal@intel.com (mailing list archive)
State New
Headers show
Series drm/i915/hdcp: Handle HDCP Line Rekeying for HDCP 1.4 | expand

Commit Message

Suraj Kandpal Nov. 6, 2024, 9:38 a.m. UTC 
TRANS_DDI_FUNC_CTL asks us to disable hdcp line rekeying when not in
hdcp 2.2 and we are not using an hdmi transcoder and it need to be
enabled when we are using an HDMI transcoder to enable HDCP 1.4.
We use intel_de_rmw cycles to update TRANS_DDI_FUNC_CTL register so
we cannot depend on the value being 0 by default everytime which calls
for seprate handling of HDCP 1.4 case.

--v2
-Use the exising function and modify it based on a bool rather than
have a different function [Matt]

Bspec: 69964, 50493, 50054
Signed-off-by: Suraj Kandpal <suraj.kandpal@intel.com>
---
 drivers/gpu/drm/i915/display/intel_hdcp.c | 41 ++++++++++++++---------
 1 file changed, 26 insertions(+), 15 deletions(-)

Comments

Jani Nikula Nov. 6, 2024, 10:03 a.m. UTC | #1 
On Wed, 06 Nov 2024, Suraj Kandpal <suraj.kandpal@intel.com> wrote:
> TRANS_DDI_FUNC_CTL asks us to disable hdcp line rekeying when not in
> hdcp 2.2 and we are not using an hdmi transcoder and it need to be
> enabled when we are using an HDMI transcoder to enable HDCP 1.4.
> We use intel_de_rmw cycles to update TRANS_DDI_FUNC_CTL register so
> we cannot depend on the value being 0 by default everytime which calls
> for seprate handling of HDCP 1.4 case.
>
> --v2
> -Use the exising function and modify it based on a bool rather than
> have a different function [Matt]
>
> Bspec: 69964, 50493, 50054
> Signed-off-by: Suraj Kandpal <suraj.kandpal@intel.com>
> ---
>  drivers/gpu/drm/i915/display/intel_hdcp.c | 41 ++++++++++++++---------
>  1 file changed, 26 insertions(+), 15 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/display/intel_hdcp.c b/drivers/gpu/drm/i915/display/intel_hdcp.c
> index 4e937fbba4d2..0530cf855463 100644
> --- a/drivers/gpu/drm/i915/display/intel_hdcp.c
> +++ b/drivers/gpu/drm/i915/display/intel_hdcp.c
> @@ -32,27 +32,36 @@
>  #define HDCP2_LC_RETRY_CNT			3
>  
>  static void
> -intel_hdcp_disable_hdcp_line_rekeying(struct intel_encoder *encoder,
> -				      struct intel_hdcp *hdcp)
> +intel_hdcp_adjust_hdcp_line_rekeying(struct intel_encoder *encoder,
> +				     struct intel_hdcp *hdcp,
> +				     bool enable)
>  {
>  	struct intel_display *display = to_intel_display(encoder);
> +	i915_reg_t *rekey_reg;
> +	u32 rekey_bit;
>  
>  	/* Here we assume HDMI is in TMDS mode of operation */
>  	if (encoder->type != INTEL_OUTPUT_HDMI)
>  		return;
>  
> -	if (DISPLAY_VER(display) >= 30)
> -		intel_de_rmw(display,
> -			     TRANS_DDI_FUNC_CTL(display, hdcp->cpu_transcoder),
> -			     0, XE3_TRANS_DDI_HDCP_LINE_REKEY_DISABLE);
> -	else if (IS_DISPLAY_VERx100_STEP(display, 1401, STEP_B0, STEP_FOREVER) ||
> -		 IS_DISPLAY_VERx100_STEP(display, 2000, STEP_B0, STEP_FOREVER))
> -		intel_de_rmw(display,
> -			     TRANS_DDI_FUNC_CTL(display, hdcp->cpu_transcoder),
> -			     0, TRANS_DDI_HDCP_LINE_REKEY_DISABLE);
> -	else if (IS_DISPLAY_VERx100_STEP(display, 1400, STEP_D0, STEP_FOREVER))
> -		intel_de_rmw(display, MTL_CHICKEN_TRANS(hdcp->cpu_transcoder),
> -			     0, HDCP_LINE_REKEY_DISABLE);
> +	rekey_reg = kzalloc(sizeof(*rekey_reg), GFP_KERNEL);

No, there's absolutely no reason to allocate this.

BR,
Jani.


> +	if (!rekey_reg)
> +		return;
> +
> +	if (DISPLAY_VER(display) >= 30) {
> +		*rekey_reg = TRANS_DDI_FUNC_CTL(display, hdcp->cpu_transcoder);
> +		rekey_bit = XE3_TRANS_DDI_HDCP_LINE_REKEY_DISABLE;
> +	} else if (IS_DISPLAY_VERx100_STEP(display, 1401, STEP_B0, STEP_FOREVER) ||
> +		   IS_DISPLAY_VERx100_STEP(display, 2000, STEP_B0, STEP_FOREVER)) {
> +		*rekey_reg = TRANS_DDI_FUNC_CTL(display, hdcp->cpu_transcoder);
> +		rekey_bit = TRANS_DDI_HDCP_LINE_REKEY_DISABLE;
> +	} else if (IS_DISPLAY_VERx100_STEP(display, 1400, STEP_D0, STEP_FOREVER)) {
> +		*rekey_reg = MTL_CHICKEN_TRANS(hdcp->cpu_transcoder);
> +		rekey_bit = HDCP_LINE_REKEY_DISABLE;
> +	}
> +
> +	intel_de_rmw(display, *rekey_reg, rekey_bit, enable ? 0 : rekey_bit);
> +	kfree(rekey_reg);
>  }
>  
>  static int intel_conn_to_vcpi(struct intel_atomic_state *state,
> @@ -1049,6 +1058,8 @@ static int intel_hdcp1_enable(struct intel_connector *connector)
>  		return ret;
>  	}
>  
> +	intel_hdcp_adjust_hdcp_line_rekeying(connector->encoder, hdcp, true);
> +
>  	/* Incase of authentication failures, HDCP spec expects reauth. */
>  	for (i = 0; i < tries; i++) {
>  		ret = intel_hdcp_auth(connector);
> @@ -2062,7 +2073,7 @@ static int _intel_hdcp2_enable(struct intel_atomic_state *state,
>  		    connector->base.base.id, connector->base.name,
>  		    hdcp->content_type);
>  
> -	intel_hdcp_disable_hdcp_line_rekeying(connector->encoder, hdcp);
> +	intel_hdcp_adjust_hdcp_line_rekeying(connector->encoder, hdcp, false);
>  
>  	ret = hdcp2_authenticate_and_encrypt(state, connector);
>  	if (ret) {
diff mbox series

Patch

diff --git a/drivers/gpu/drm/i915/display/intel_hdcp.c b/drivers/gpu/drm/i915/display/intel_hdcp.c
index 4e937fbba4d2..0530cf855463 100644
--- a/drivers/gpu/drm/i915/display/intel_hdcp.c
+++ b/drivers/gpu/drm/i915/display/intel_hdcp.c
@@ -32,27 +32,36 @@ 
 #define HDCP2_LC_RETRY_CNT			3
 
 static void
-intel_hdcp_disable_hdcp_line_rekeying(struct intel_encoder *encoder,
-				      struct intel_hdcp *hdcp)
+intel_hdcp_adjust_hdcp_line_rekeying(struct intel_encoder *encoder,
+				     struct intel_hdcp *hdcp,
+				     bool enable)
 {
 	struct intel_display *display = to_intel_display(encoder);
+	i915_reg_t *rekey_reg;
+	u32 rekey_bit;
 
 	/* Here we assume HDMI is in TMDS mode of operation */
 	if (encoder->type != INTEL_OUTPUT_HDMI)
 		return;
 
-	if (DISPLAY_VER(display) >= 30)
-		intel_de_rmw(display,
-			     TRANS_DDI_FUNC_CTL(display, hdcp->cpu_transcoder),
-			     0, XE3_TRANS_DDI_HDCP_LINE_REKEY_DISABLE);
-	else if (IS_DISPLAY_VERx100_STEP(display, 1401, STEP_B0, STEP_FOREVER) ||
-		 IS_DISPLAY_VERx100_STEP(display, 2000, STEP_B0, STEP_FOREVER))
-		intel_de_rmw(display,
-			     TRANS_DDI_FUNC_CTL(display, hdcp->cpu_transcoder),
-			     0, TRANS_DDI_HDCP_LINE_REKEY_DISABLE);
-	else if (IS_DISPLAY_VERx100_STEP(display, 1400, STEP_D0, STEP_FOREVER))
-		intel_de_rmw(display, MTL_CHICKEN_TRANS(hdcp->cpu_transcoder),
-			     0, HDCP_LINE_REKEY_DISABLE);
+	rekey_reg = kzalloc(sizeof(*rekey_reg), GFP_KERNEL);
+	if (!rekey_reg)
+		return;
+
+	if (DISPLAY_VER(display) >= 30) {
+		*rekey_reg = TRANS_DDI_FUNC_CTL(display, hdcp->cpu_transcoder);
+		rekey_bit = XE3_TRANS_DDI_HDCP_LINE_REKEY_DISABLE;
+	} else if (IS_DISPLAY_VERx100_STEP(display, 1401, STEP_B0, STEP_FOREVER) ||
+		   IS_DISPLAY_VERx100_STEP(display, 2000, STEP_B0, STEP_FOREVER)) {
+		*rekey_reg = TRANS_DDI_FUNC_CTL(display, hdcp->cpu_transcoder);
+		rekey_bit = TRANS_DDI_HDCP_LINE_REKEY_DISABLE;
+	} else if (IS_DISPLAY_VERx100_STEP(display, 1400, STEP_D0, STEP_FOREVER)) {
+		*rekey_reg = MTL_CHICKEN_TRANS(hdcp->cpu_transcoder);
+		rekey_bit = HDCP_LINE_REKEY_DISABLE;
+	}
+
+	intel_de_rmw(display, *rekey_reg, rekey_bit, enable ? 0 : rekey_bit);
+	kfree(rekey_reg);
 }
 
 static int intel_conn_to_vcpi(struct intel_atomic_state *state,
@@ -1049,6 +1058,8 @@  static int intel_hdcp1_enable(struct intel_connector *connector)
 		return ret;
 	}
 
+	intel_hdcp_adjust_hdcp_line_rekeying(connector->encoder, hdcp, true);
+
 	/* Incase of authentication failures, HDCP spec expects reauth. */
 	for (i = 0; i < tries; i++) {
 		ret = intel_hdcp_auth(connector);
@@ -2062,7 +2073,7 @@  static int _intel_hdcp2_enable(struct intel_atomic_state *state,
 		    connector->base.base.id, connector->base.name,
 		    hdcp->content_type);
 
-	intel_hdcp_disable_hdcp_line_rekeying(connector->encoder, hdcp);
+	intel_hdcp_adjust_hdcp_line_rekeying(connector->encoder, hdcp, false);
 
 	ret = hdcp2_authenticate_and_encrypt(state, connector);
 	if (ret) {