[PATCH 1/3] drm/i915: Add get_config implementation for DSI encoder

[Shobhit Kumar <shobhit.kumar@intel.com>]

Call to vlv_crtc_clock_get is not needed for DSI and was causing dpio
read WARN dumps as well. Absence of ->get_config was casuing othet WARN
dumps as well. With this the last of the known WARN dumps for DSI should
be fixed.

Signed-off-by: Shobhit Kumar <shobhit.kumar@intel.com>
---
 drivers/gpu/drm/i915/intel_display.c |  7 +++---
 drivers/gpu/drm/i915/intel_dsi.c     | 45 ++++++++++++++++++++++++++++++++++++
 drivers/gpu/drm/i915/intel_dsi.h     |  3 +++
 drivers/gpu/drm/i915/intel_dsi_pll.c |  4 +++-
 4 files changed, 55 insertions(+), 4 deletions(-)

diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index fe6f1db..3d0ea7c 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -6309,9 +6309,10 @@ static bool i9xx_get_pipe_config(struct intel_crtc *crtc,
 
 	if (IS_CHERRYVIEW(dev))
 		chv_crtc_clock_get(crtc, pipe_config);
-	else if (IS_VALLEYVIEW(dev))
-		vlv_crtc_clock_get(crtc, pipe_config);
-	else
+	else if (IS_VALLEYVIEW(dev)) {
+		if (!intel_pipe_has_type(&crtc->base, INTEL_OUTPUT_DSI))
+			vlv_crtc_clock_get(crtc, pipe_config);
+	} else
 		i9xx_crtc_clock_get(crtc, pipe_config);
 
 	return true;
diff --git a/drivers/gpu/drm/i915/intel_dsi.c b/drivers/gpu/drm/i915/intel_dsi.c
index bfcefbf..61da0e5 100644
--- a/drivers/gpu/drm/i915/intel_dsi.c
+++ b/drivers/gpu/drm/i915/intel_dsi.c
@@ -351,9 +351,54 @@ static bool intel_dsi_get_hw_state(struct intel_encoder *encoder,
 static void intel_dsi_get_config(struct intel_encoder *encoder,
 				 struct intel_crtc_config *pipe_config)
 {
+	struct drm_i915_private *dev_priv = encoder->base.dev->dev_private;
+	struct intel_dsi *intel_dsi = enc_to_intel_dsi(&encoder->base);
+	u32 dsi_clock, pclk;
+	u32 pll_ctl, pll_div;
+	u32 m = 0, p = 0;
+	int refclk = 25000;
+	int i;
+
 	DRM_DEBUG_KMS("\n");
 
 	/* XXX: read flags, set to adjusted_mode */
+	pipe_config->quirks = 1;
+
+	memset(&pipe_config->dpll_hw_state, 0,
+				sizeof(pipe_config->dpll_hw_state));
+
+	mutex_lock(&dev_priv->dpio_lock);
+	pll_ctl = vlv_cck_read(dev_priv, CCK_REG_DSI_PLL_CONTROL);
+	pll_div = vlv_cck_read(dev_priv, CCK_REG_DSI_PLL_DIVIDER);
+	mutex_unlock(&dev_priv->dpio_lock);
+
+	pll_ctl &= ~(DSI_PLL_CLK_GATE_DSI0_DSIPLL | DSI_PLL_VCO_EN);
+	pll_ctl = pll_ctl >> (DSI_PLL_P1_POST_DIV_SHIFT - 2);
+
+	while (pll_ctl) {
+		pll_ctl = pll_ctl >> 1;
+		p++;
+	}
+	p--;
+
+	for (i = 0; i < num_lfsr_converts; i++) {
+		if (lfsr_converts[i] == pll_div)
+			break;
+	}
+
+	if (i == num_lfsr_converts) {
+		DRM_ERROR("wrong m_seed programmed\n");
+		return;
+	}
+
+	m = i + 62;
+
+	dsi_clock = (m * refclk) / p;
+	pclk = DIV_ROUND_CLOSEST(dsi_clock * intel_dsi->lane_count,
+			         pipe_config->pipe_bpp);
+
+	pipe_config->adjusted_mode.crtc_clock = pclk;
+	pipe_config->port_clock = pclk;
 }
 
 static enum drm_mode_status
diff --git a/drivers/gpu/drm/i915/intel_dsi.h b/drivers/gpu/drm/i915/intel_dsi.h
index 31db33d..e0c16b0 100644
--- a/drivers/gpu/drm/i915/intel_dsi.h
+++ b/drivers/gpu/drm/i915/intel_dsi.h
@@ -130,6 +130,9 @@ static inline struct intel_dsi *enc_to_intel_dsi(struct drm_encoder *encoder)
 	return container_of(encoder, struct intel_dsi, base.base);
 }
 
+extern const u32 lfsr_converts[];
+extern const int num_lfsr_converts;
+
 extern void vlv_enable_dsi_pll(struct intel_encoder *encoder);
 extern void vlv_disable_dsi_pll(struct intel_encoder *encoder);
 
diff --git a/drivers/gpu/drm/i915/intel_dsi_pll.c b/drivers/gpu/drm/i915/intel_dsi_pll.c
index ba79ec1..78449ea 100644
--- a/drivers/gpu/drm/i915/intel_dsi_pll.c
+++ b/drivers/gpu/drm/i915/intel_dsi_pll.c
@@ -43,13 +43,15 @@ struct dsi_mnp {
 	u32 dsi_pll_div;
 };
 
-static const u32 lfsr_converts[] = {
+const u32 lfsr_converts[] = {
 	426, 469, 234, 373, 442, 221, 110, 311, 411,		/* 62 - 70 */
 	461, 486, 243, 377, 188, 350, 175, 343, 427, 213,	/* 71 - 80 */
 	106, 53, 282, 397, 354, 227, 113, 56, 284, 142,		/* 81 - 90 */
 	71, 35							/* 91 - 92 */
 };
 
+const int num_lfsr_converts = sizeof(lfsr_converts) / sizeof(lfsr_converts[0]);
+
 #ifdef DSI_CLK_FROM_RR
 
 static u32 dsi_rr_formula(const struct drm_display_mode *mode,
-- 
1.9.1