[Intel-gfx] [BXT DSI timing fixes v1 1/3] drm/i915/: DSI mode setting fix

[Uma Shankar]

Fixed dsi crtc state. Updated the get config function
and handled the DSI and DDI encoder cases.

BXT DSI have to be handled differently from rest of the encoders.
Reading the port control register to determine if DSI is enabled.
Generalizing it for all existing platforms.

Signed-off-by: Uma Shankar <uma.shankar at intel.com>
Signed-off-by: Vandana Kannan <vandana.kannan at intel.com>
---
 drivers/gpu/drm/i915/intel_display.c |   94 ++++++++++++++++++++++++----------
 1 file changed, 67 insertions(+), 27 deletions(-)

diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index cddb0c6..75c60b8 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -44,6 +44,7 @@
 #include <drm/drm_plane_helper.h>
 #include <drm/drm_rect.h>
 #include <linux/dma_remapping.h>
+#include "intel_dsi.h"
 
 /* Primary plane formats for gen <= 3 */
 static const uint32_t i8xx_primary_formats[] = {
@@ -9788,46 +9789,85 @@ static bool haswell_get_pipe_config(struct intel_crtc *crtc,
 	struct drm_device *dev = crtc->base.dev;
 	struct drm_i915_private *dev_priv = dev->dev_private;
 	enum intel_display_power_domain pfit_domain;
-	uint32_t tmp;
+	uint32_t tmp = 0;
+	bool is_dsi = false;
+	bool dsi_enc_enabled = false;
+	u32 port_ctrl = 0;
 
 	if (!intel_display_power_is_enabled(dev_priv,
-					 POWER_DOMAIN_PIPE(crtc->pipe)))
+				POWER_DOMAIN_PIPE(crtc->pipe)))
 		return false;
 
 	pipe_config->cpu_transcoder = (enum transcoder) crtc->pipe;
 	pipe_config->shared_dpll = DPLL_ID_PRIVATE;
 
-	tmp = I915_READ(TRANS_DDI_FUNC_CTL(TRANSCODER_EDP));
-	if (tmp & TRANS_DDI_FUNC_ENABLE) {
-		enum pipe trans_edp_pipe;
-		switch (tmp & TRANS_DDI_EDP_INPUT_MASK) {
-		default:
-			WARN(1, "unknown pipe linked to edp transcoder\n");
-		case TRANS_DDI_EDP_INPUT_A_ONOFF:
-		case TRANS_DDI_EDP_INPUT_A_ON:
-			trans_edp_pipe = PIPE_A;
-			break;
-		case TRANS_DDI_EDP_INPUT_B_ONOFF:
-			trans_edp_pipe = PIPE_B;
-			break;
-		case TRANS_DDI_EDP_INPUT_C_ONOFF:
-			trans_edp_pipe = PIPE_C;
-			break;
+	is_dsi = intel_pipe_has_type(crtc, INTEL_OUTPUT_DSI);
+
+	/*
+	 * Check if encoder is enabled or not
+	 * Separate implementation for DSI and DDI encoders.
+	 */
+	if (is_dsi) {
+		struct intel_encoder *encoder;
+
+		for_each_encoder_on_crtc(dev, &crtc->base, encoder) {
+			struct intel_dsi *intel_dsi =
+				enc_to_intel_dsi(&encoder->base);
+			enum port port;
+
+			for_each_dsi_port(port, intel_dsi->ports) {
+				if (IS_BROXTON(dev))
+					port_ctrl = BXT_MIPI_PORT_CTRL(port);
+				else if (IS_VALLEYVIEW(dev))
+					port_ctrl = MIPI_PORT_CTRL(port);
+
+				tmp = I915_READ(port_ctrl);
+				if (tmp & DPI_ENABLE) {
+					dsi_enc_enabled = true;
+					break;
+				}
+			}
+
+			if (dsi_enc_enabled)
+				break;
 		}
+		if (!dsi_enc_enabled)
+			return false;
+	} else {
 
-		if (trans_edp_pipe == crtc->pipe)
-			pipe_config->cpu_transcoder = TRANSCODER_EDP;
-	}
+		tmp = I915_READ(TRANS_DDI_FUNC_CTL(TRANSCODER_EDP));
+		if (tmp & TRANS_DDI_FUNC_ENABLE) {
+			enum pipe trans_edp_pipe;
 
-	if (!intel_display_power_is_enabled(dev_priv,
+			switch (tmp & TRANS_DDI_EDP_INPUT_MASK) {
+			default:
+				WARN(1, "unknown pipe linked to edp transcoder\n");
+			case TRANS_DDI_EDP_INPUT_A_ONOFF:
+			case TRANS_DDI_EDP_INPUT_A_ON:
+				trans_edp_pipe = PIPE_A;
+				break;
+			case TRANS_DDI_EDP_INPUT_B_ONOFF:
+				trans_edp_pipe = PIPE_B;
+				break;
+			case TRANS_DDI_EDP_INPUT_C_ONOFF:
+				trans_edp_pipe = PIPE_C;
+				break;
+			}
+
+			if (trans_edp_pipe == crtc->pipe)
+				pipe_config->cpu_transcoder = TRANSCODER_EDP;
+		}
+
+		if (!intel_display_power_is_enabled(dev_priv,
 			POWER_DOMAIN_TRANSCODER(pipe_config->cpu_transcoder)))
-		return false;
+			return false;
 
-	tmp = I915_READ(PIPECONF(pipe_config->cpu_transcoder));
-	if (!(tmp & PIPECONF_ENABLE))
-		return false;
+		tmp = I915_READ(PIPECONF(pipe_config->cpu_transcoder));
+		if (!(tmp & PIPECONF_ENABLE))
+			return false;
 
-	haswell_get_ddi_port_state(crtc, pipe_config);
+		haswell_get_ddi_port_state(crtc, pipe_config);
+	}
 
 	intel_get_pipe_timings(crtc, pipe_config);
 
-- 
1.7.9.5