[PATCH 2/3 V3] drm/i915/BXT: Fixed COS blanking issue

[Ramalingam C <ramalingam.c@intel.com>]

From: Uma Shankar <uma.shankar@intel.com>

During Charging OS mode, mipi display was blanking.This is
because during driver load, though encoder, connector were
active but crtc returned inactive. This caused sanitize
function to disable the DSI panel. In AOS, this is fine
since HWC will do a modeset and crtc, connector, encoder
mapping will be restored. But in COS, no modeset is called,
it just calls DPMS ON/OFF.

This is fine on BYT/CHT since transcoder is common b/w
all encoders. But for BXT, there is a separate mipi
transcoder. Hence this needs special handling for BXT.

V2: pipe_config->has_dsi_encoder is set for BXT [By Jani]

V3: Timing parameters are retrieved from VBT. [By Jani]

Signed-off-by: Uma Shankar <uma.shankar@intel.com>
Signed-off-by: Ramalingam C <ramalingam.c@intel.com>
---
 drivers/gpu/drm/i915/intel_display.c |  106 ++++++++++++++++++++++++++++++++--
 1 file changed, 100 insertions(+), 6 deletions(-)

diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index a66220a..e47a75c 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -34,6 +34,7 @@
 #include <drm/drm_edid.h>
 #include <drm/drmP.h>
 #include "intel_drv.h"
+#include "intel_dsi.h"
 #include <drm/i915_drm.h>
 #include "i915_drv.h"
 #include "i915_trace.h"
@@ -7814,6 +7815,53 @@ static void intel_set_pipe_timings(struct intel_crtc *intel_crtc)
 		   (intel_crtc->config->pipe_src_h - 1));
 }
 
+static void intel_get_dsi_pipe_timings(struct intel_crtc *crtc,
+				   struct intel_crtc_state *pipe_config)
+{
+	struct drm_device *dev = crtc->base.dev;
+	struct drm_i915_private *dev_priv = dev->dev_private;
+	struct drm_display_mode *vbt_dsi_mode =
+						dev_priv->vbt.lfp_lvds_vbt_mode;
+	struct intel_encoder *encoder;
+	uint32_t tmp;
+
+	pipe_config->base.adjusted_mode.crtc_hdisplay = vbt_dsi_mode->hdisplay;
+	pipe_config->base.adjusted_mode.crtc_htotal = vbt_dsi_mode->htotal;
+	pipe_config->base.adjusted_mode.crtc_hblank_start =
+						vbt_dsi_mode->hdisplay;
+	pipe_config->base.adjusted_mode.crtc_hblank_end = vbt_dsi_mode->htotal;
+	pipe_config->base.adjusted_mode.crtc_hsync_start =
+						vbt_dsi_mode->hsync_start;
+	pipe_config->base.adjusted_mode.crtc_hsync_end =
+						vbt_dsi_mode->hsync_end;
+
+	pipe_config->base.adjusted_mode.crtc_vdisplay = vbt_dsi_mode->vdisplay;
+	pipe_config->base.adjusted_mode.crtc_vtotal = vbt_dsi_mode->vtotal;
+	pipe_config->base.adjusted_mode.crtc_vblank_start =
+							vbt_dsi_mode->vdisplay;
+	pipe_config->base.adjusted_mode.crtc_vblank_end = vbt_dsi_mode->vtotal;
+	pipe_config->base.adjusted_mode.crtc_vsync_start =
+						vbt_dsi_mode->vsync_start;
+	pipe_config->base.adjusted_mode.crtc_vsync_end =
+						vbt_dsi_mode->vsync_end;
+
+	for_each_encoder_on_crtc(dev, &crtc->base, encoder) {
+		if (encoder->type == INTEL_OUTPUT_DSI) {
+			struct intel_dsi *intel_dsi =
+				enc_to_intel_dsi(&encoder->base);
+			pipe_config->pipe_bpp =
+				dsi_pixel_format_bpp(intel_dsi->pixel_format);
+		}
+	}
+
+	tmp = I915_READ(PIPESRC(crtc->pipe));
+	pipe_config->pipe_src_h = (tmp & 0xffff) + 1;
+	pipe_config->pipe_src_w = ((tmp >> 16) & 0xffff) + 1;
+
+	pipe_config->base.mode.vdisplay = pipe_config->pipe_src_h;
+	pipe_config->base.mode.hdisplay = pipe_config->pipe_src_w;
+}
+
 static void intel_get_pipe_timings(struct intel_crtc *crtc,
 				   struct intel_crtc_state *pipe_config)
 {
@@ -9962,6 +10010,40 @@ static void haswell_get_ddi_port_state(struct intel_crtc *crtc,
 	}
 }
 
+static void bxt_get_pipe_config_dsi(struct intel_crtc *crtc,
+					struct intel_crtc_state *pipe_config)
+{
+	struct drm_device *dev = crtc->base.dev;
+	struct drm_i915_private *dev_priv = dev->dev_private;
+	enum port port = (dev_priv->vbt.dsi.port == DVO_PORT_MIPIA)
+				? PORT_A : PORT_C;
+	uint32_t dsi_ctrl = I915_READ(MIPI_CTRL(port));
+	uint32_t tmp;
+
+	tmp = I915_READ(BXT_MIPI_PORT_CTRL(port));
+	if (tmp & DPI_ENABLE) {
+		enum pipe trans_dsi_pipe;
+
+		switch (dsi_ctrl & BXT_PIPE_SELECT_MASK) {
+		default:
+			WARN(1, "unknown pipe linked to dsi transcoder\n");
+			return;
+		case BXT_PIPE_SELECT(PIPE_A):
+			trans_dsi_pipe = PIPE_A;
+			break;
+		case BXT_PIPE_SELECT(PIPE_B):
+			trans_dsi_pipe = PIPE_B;
+			break;
+		case BXT_PIPE_SELECT(PIPE_C):
+			trans_dsi_pipe = PIPE_C;
+			break;
+		}
+
+		if (trans_dsi_pipe == crtc->pipe)
+			pipe_config->has_dsi_encoder = true;
+	}
+}
+
 static bool haswell_get_pipe_config(struct intel_crtc *crtc,
 				    struct intel_crtc_state *pipe_config)
 {
@@ -9999,17 +10081,29 @@ static bool haswell_get_pipe_config(struct intel_crtc *crtc,
 			pipe_config->cpu_transcoder = TRANSCODER_EDP;
 	}
 
+	if (dev_priv->vbt.has_mipi && IS_BROXTON(dev))
+		bxt_get_pipe_config_dsi(crtc, pipe_config);
+
 	if (!intel_display_power_is_enabled(dev_priv,
 			POWER_DOMAIN_TRANSCODER(pipe_config->cpu_transcoder)))
 		return false;
 
-	tmp = I915_READ(PIPECONF(pipe_config->cpu_transcoder));
-	if (!(tmp & PIPECONF_ENABLE))
-		return false;
-
-	haswell_get_ddi_port_state(crtc, pipe_config);
+	if (pipe_config->has_dsi_encoder && IS_BROXTON(dev))
+		/*
+		 * BXT doesn't have the PIPE timing registers.
+		 * Hence retrieved the pipe detail from PORT register.
+		 * And timing parameters are obtained from VBT
+		 */
+		intel_get_dsi_pipe_timings(crtc, pipe_config);
+	else {
+		tmp = I915_READ(PIPECONF(pipe_config->cpu_transcoder));
+		if (!(tmp & PIPECONF_ENABLE))
+			return false;
+		if (!IS_VALLEYVIEW(dev))
+			haswell_get_ddi_port_state(crtc, pipe_config);
 
-	intel_get_pipe_timings(crtc, pipe_config);
+		intel_get_pipe_timings(crtc, pipe_config);
+	}
 
 	if (INTEL_INFO(dev)->gen >= 9) {
 		skl_init_scalers(dev, crtc, pipe_config);
-- 
1.7.9.5

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