[Intel-gfx] [PATCH V6] 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 V5:
	- Added reviewed-by
	- Removed redundant braces and debug message format - Imre
Changes since V4:
        - Modified function comment Wa_<number>:icl,jsl,ehl - Lucas
        - Modified debug message in sync state - Imre
Changes since V3:
        - More meaningful name to workaround - Imre
        - Remove boolean check clear flag
        - Add WA_verify hook in dsi sync_state
Changes since V2:
        - Used REG_BIT, ignored pipe A and used sw state check - Jani
        - Made function wrapper - Jani
Changes since V1:
        - ./dim checkpatch errors addressed

Signed-off-by: Tejas Upadhyay <tejaskumarx.surendrakumar.upadhyay at intel.com>
Reviewed-by: Imre Deak <imre.deak at intel.com>
---
 drivers/gpu/drm/i915/display/icl_dsi.c | 42 ++++++++++++++++++++++++++
 drivers/gpu/drm/i915/i915_reg.h        |  1 +
 2 files changed, 43 insertions(+)

diff --git a/drivers/gpu/drm/i915/display/icl_dsi.c b/drivers/gpu/drm/i915/display/icl_dsi.c
index 16812488c5dd..970ba9e7f84e 100644
--- a/drivers/gpu/drm/i915/display/icl_dsi.c
+++ b/drivers/gpu/drm/i915/display/icl_dsi.c
@@ -1253,15 +1253,36 @@ static void gen11_dsi_pre_enable(struct intel_atomic_state *state,
 	gen11_dsi_set_transcoder_timings(encoder, pipe_config);
 }
 
+/*
+ * Wa_1409054076:icl,jsl,ehl
+ * 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
+ */
+static void icl_apply_kvmr_pipe_a_wa(struct intel_encoder *encoder,
+				     enum pipe pipe, bool enable)
+{
+	struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
+
+	if (DISPLAY_VER(dev_priv) == 11 && pipe == PIPE_B)
+		intel_de_rmw(dev_priv, CHICKEN_PAR1_1,
+			     IGNORE_KVMR_PIPE_A,
+			     enable ? IGNORE_KVMR_PIPE_A : 0);
+}
 static void gen11_dsi_enable(struct intel_atomic_state *state,
 			     struct intel_encoder *encoder,
 			     const struct intel_crtc_state *crtc_state,
 			     const struct drm_connector_state *conn_state)
 {
 	struct intel_dsi *intel_dsi = enc_to_intel_dsi(encoder);
+	struct intel_crtc *crtc = to_intel_crtc(conn_state->crtc);
 
 	drm_WARN_ON(state->base.dev, crtc_state->has_pch_encoder);
 
+	/* Wa_1409054076:icl,jsl,ehl */
+	icl_apply_kvmr_pipe_a_wa(encoder, crtc->pipe, true);
+
 	/* step6d: enable dsi transcoder */
 	gen11_dsi_enable_transcoder(encoder);
 
@@ -1415,6 +1436,7 @@ static void gen11_dsi_disable(struct intel_atomic_state *state,
 			      const struct drm_connector_state *old_conn_state)
 {
 	struct intel_dsi *intel_dsi = enc_to_intel_dsi(encoder);
+	struct intel_crtc *crtc = to_intel_crtc(old_conn_state->crtc);
 
 	/* step1: turn off backlight */
 	intel_dsi_vbt_exec_sequence(intel_dsi, MIPI_SEQ_BACKLIGHT_OFF);
@@ -1423,6 +1445,9 @@ static void gen11_dsi_disable(struct intel_atomic_state *state,
 	/* step2d,e: disable transcoder and wait */
 	gen11_dsi_disable_transcoder(encoder);
 
+	/* Wa_1409054076:icl,jsl,ehl */
+	icl_apply_kvmr_pipe_a_wa(encoder, crtc->pipe, false);
+
 	/* step2f,g: powerdown panel */
 	gen11_dsi_powerdown_panel(encoder);
 
@@ -1548,6 +1573,22 @@ static void gen11_dsi_get_config(struct intel_encoder *encoder,
 		pipe_config->mode_flags |= I915_MODE_FLAG_DSI_PERIODIC_CMD_MODE;
 }
 
+static void gen11_dsi_sync_state(struct intel_encoder *encoder,
+				 const struct intel_crtc_state *crtc_state)
+{
+	struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
+	struct intel_crtc *intel_crtc = to_intel_crtc(crtc_state->uapi.crtc);
+	enum pipe pipe = intel_crtc->pipe;
+
+	/* wa verify 1409054076:icl,jsl,ehl */
+	if (DISPLAY_VER(dev_priv) == 11 && pipe == PIPE_B &&
+	    !(intel_de_read(dev_priv, CHICKEN_PAR1_1) & IGNORE_KVMR_PIPE_A))
+		drm_dbg_kms(&dev_priv->drm,
+			    "[ENCODER:%d:%s] BIOS left IGNORE_KVMR_PIPE_A cleared with pipe B enabled\n",
+			    encoder->base.base.id,
+			    encoder->base.name);
+}
+
 static int gen11_dsi_dsc_compute_config(struct intel_encoder *encoder,
 					struct intel_crtc_state *crtc_state)
 {
@@ -1966,6 +2007,7 @@ void icl_dsi_init(struct drm_i915_private *dev_priv)
 	encoder->post_disable = gen11_dsi_post_disable;
 	encoder->port = port;
 	encoder->get_config = gen11_dsi_get_config;
+	encoder->sync_state = gen11_dsi_sync_state;
 	encoder->update_pipe = intel_panel_update_backlight;
 	encoder->compute_config = gen11_dsi_compute_config;
 	encoder->get_hw_state = gen11_dsi_get_hw_state;
diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index e915ec034c98..955027799d1d 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -8107,6 +8107,7 @@ enum {
 # define CHICKEN3_DGMG_DONE_FIX_DISABLE		(1 << 2)
 
 #define CHICKEN_PAR1_1			_MMIO(0x42080)
+#define  IGNORE_KVMR_PIPE_A		REG_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)
-- 
2.31.1