[Intel-gfx] [PATCH V2] drm/i915/jsl: Add W/A 1409054076 for JSL

[Tejas Upadhyay]

When pipe A is disabled and MIPI DSI is enabled on pipe B,
the AMT KVMR feature will incorrectly see pipe A as enabled.
Set 0x42080 bit 23=1 before enabling DSI on pipe B and leave
it set while DSI is enabled on pipe B. No impact to setting
it all the time.

Changes since V1:
	- ./dim checkpatch errors addressed

Signed-off-by: Tejas Upadhyay <tejaskumarx.surendrakumar.upadhyay at intel.com>
---
 drivers/gpu/drm/i915/display/icl_dsi.c | 38 ++++++++++++++++++++++++++
 drivers/gpu/drm/i915/i915_reg.h        |  1 +
 2 files changed, 39 insertions(+)

diff --git a/drivers/gpu/drm/i915/display/icl_dsi.c b/drivers/gpu/drm/i915/display/icl_dsi.c
index ce544e20f35c..e5a6660861e8 100644
--- a/drivers/gpu/drm/i915/display/icl_dsi.c
+++ b/drivers/gpu/drm/i915/display/icl_dsi.c
@@ -40,6 +40,8 @@
 #include "skl_scaler.h"
 #include "skl_universal_plane.h"
 
+static bool gen11_dsi_get_hw_state(struct intel_encoder *encoder,
+				   enum pipe *pipe);
 static int header_credits_available(struct drm_i915_private *dev_priv,
 				    enum transcoder dsi_trans)
 {
@@ -1036,9 +1038,26 @@ static void gen11_dsi_enable_transcoder(struct intel_encoder *encoder)
 	struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
 	struct intel_dsi *intel_dsi = enc_to_intel_dsi(encoder);
 	enum port port;
+	enum pipe pipe;
 	enum transcoder dsi_trans;
 	u32 tmp;
 
+	/*
+	 * WA 1409054076:JSL
+	 * When pipe A is disabled and MIPI DSI is enabled on pipe B,
+	 * the AMT KVMR feature will incorrectly see pipe A as enabled.
+	 * Set 0x42080 bit 23=1 before enabling DSI on pipe B and leave
+	 * it set while DSI is enabled on pipe B
+	 */
+	gen11_dsi_get_hw_state(encoder, &pipe);
+	if (IS_PLATFORM(dev_priv, INTEL_JASPERLAKE) &&
+	    pipe == PIPE_B &&
+	    dev_priv->active_pipes != BIT(PIPE_A) &&
+	    !(intel_de_read(dev_priv, CHICKEN_PAR1_1) &
+			    IGNORE_KVMR_PIPE_A)) {
+		intel_de_write(dev_priv, CHICKEN_PAR1_1,
+			       intel_de_read(dev_priv, CHICKEN_PAR1_1) | IGNORE_KVMR_PIPE_A);
+	}
 	for_each_dsi_port(port, intel_dsi->ports) {
 		dsi_trans = dsi_port_to_transcoder(port);
 		tmp = intel_de_read(dev_priv, PIPECONF(dsi_trans));
@@ -1245,6 +1264,7 @@ static void gen11_dsi_enable(struct intel_atomic_state *state,
 
 	drm_WARN_ON(state->base.dev, crtc_state->has_pch_encoder);
 
+
 	/* step6d: enable dsi transcoder */
 	gen11_dsi_enable_transcoder(encoder);
 
@@ -1260,9 +1280,27 @@ static void gen11_dsi_disable_transcoder(struct intel_encoder *encoder)
 	struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
 	struct intel_dsi *intel_dsi = enc_to_intel_dsi(encoder);
 	enum port port;
+	enum pipe pipe;
 	enum transcoder dsi_trans;
 	u32 tmp;
 
+	/*
+	 * WA 1409054076:JSL
+	 * When pipe A is disabled and MIPI DSI is enabled on pipe B,
+	 * the AMT KVMR feature will incorrectly see pipe A as enabled.
+	 * Set 0x42080 bit 23=1 before enabling DSI on pipe B and leave
+	 * it set while DSI is enabled on pipe B
+	 */
+	gen11_dsi_get_hw_state(encoder, &pipe);
+	if (IS_PLATFORM(dev_priv, INTEL_JASPERLAKE) &&
+	    pipe == PIPE_B &&
+	    dev_priv->active_pipes != BIT(PIPE_A) &&
+	    (intel_de_read(dev_priv, CHICKEN_PAR1_1) &
+			   IGNORE_KVMR_PIPE_A)) {
+		intel_de_write(dev_priv, CHICKEN_PAR1_1,
+			       intel_de_read(dev_priv, CHICKEN_PAR1_1) &
+						!IGNORE_KVMR_PIPE_A);
+	}
 	for_each_dsi_port(port, intel_dsi->ports) {
 		dsi_trans = dsi_port_to_transcoder(port);
 
diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index 871d839dfcb8..8b67cd14ff7e 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -8039,6 +8039,7 @@ enum {
 # define CHICKEN3_DGMG_DONE_FIX_DISABLE		(1 << 2)
 
 #define CHICKEN_PAR1_1			_MMIO(0x42080)
+#define  IGNORE_KVMR_PIPE_A		BIT(23)
 #define  KBL_ARB_FILL_SPARE_22		REG_BIT(22)
 #define  DIS_RAM_BYPASS_PSR2_MAN_TRACK	(1 << 16)
 #define  SKL_DE_COMPRESSED_HASH_MODE	(1 << 15)
-- 
2.30.0