X-Git-Url: https://gerrit.opnfv.org/gerrit/gitweb?a=blobdiff_plain;f=kernel%2Fdrivers%2Fgpu%2Fdrm%2Fi915%2Fintel_dsi_pll.c;fp=kernel%2Fdrivers%2Fgpu%2Fdrm%2Fi915%2Fintel_dsi_pll.c;h=cb3cf3986212fd21f0e0f3ab0aa4dd443cc23ea5;hb=e09b41010ba33a20a87472ee821fa407a5b8da36;hp=3622d0bafdf8ad0565dd7284ad628125043034d6;hpb=f93b97fd65072de626c074dbe099a1fff05ce060;p=kvmfornfv.git

diff --git a/kernel/drivers/gpu/drm/i915/intel_dsi_pll.c b/kernel/drivers/gpu/drm/i915/intel_dsi_pll.c
index 3622d0baf..cb3cf3986 100644
--- a/kernel/drivers/gpu/drm/i915/intel_dsi_pll.c
+++ b/kernel/drivers/gpu/drm/i915/intel_dsi_pll.c
@@ -38,6 +38,27 @@
 #define DSI_HFP_PACKET_EXTRA_SIZE	6
 #define DSI_EOTP_PACKET_SIZE		4
 
+static int dsi_pixel_format_bpp(int pixel_format)
+{
+	int bpp;
+
+	switch (pixel_format) {
+	default:
+	case VID_MODE_FORMAT_RGB888:
+	case VID_MODE_FORMAT_RGB666_LOOSE:
+		bpp = 24;
+		break;
+	case VID_MODE_FORMAT_RGB666:
+		bpp = 18;
+		break;
+	case VID_MODE_FORMAT_RGB565:
+		bpp = 16;
+		break;
+	}
+
+	return bpp;
+}
+
 struct dsi_mnp {
 	u32 dsi_pll_ctrl;
 	u32 dsi_pll_div;
@@ -46,8 +67,8 @@ struct dsi_mnp {
 static 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 */
+	106, 53, 282, 397, 454, 227, 113, 56, 284, 142,		/* 81 - 90 */
+	71, 35, 273, 136, 324, 418, 465, 488, 500, 506		/* 91 - 100 */
 };
 
 #ifdef DSI_CLK_FROM_RR
@@ -65,19 +86,7 @@ static u32 dsi_rr_formula(const struct drm_display_mode *mode,
 	u32 dsi_bit_clock_hz;
 	u32 dsi_clk;
 
-	switch (pixel_format) {
-	default:
-	case VID_MODE_FORMAT_RGB888:
-	case VID_MODE_FORMAT_RGB666_LOOSE:
-		bpp = 24;
-		break;
-	case VID_MODE_FORMAT_RGB666:
-		bpp = 18;
-		break;
-	case VID_MODE_FORMAT_RGB565:
-		bpp = 16;
-		break;
-	}
+	bpp = dsi_pixel_format_bpp(pixel_format);
 
 	hactive = mode->hdisplay;
 	vactive = mode->vdisplay;
@@ -137,21 +146,7 @@ static u32 dsi_rr_formula(const struct drm_display_mode *mode,
 static u32 dsi_clk_from_pclk(u32 pclk, int pixel_format, int lane_count)
 {
 	u32 dsi_clk_khz;
-	u32 bpp;
-
-	switch (pixel_format) {
-	default:
-	case VID_MODE_FORMAT_RGB888:
-	case VID_MODE_FORMAT_RGB666_LOOSE:
-		bpp = 24;
-		break;
-	case VID_MODE_FORMAT_RGB666:
-		bpp = 18;
-		break;
-	case VID_MODE_FORMAT_RGB565:
-		bpp = 16;
-		break;
-	}
+	u32 bpp = dsi_pixel_format_bpp(pixel_format);
 
 	/* DSI data rate = pixel clock * bits per pixel / lane count
 	   pixel clock is converted from KHz to Hz */
@@ -162,59 +157,55 @@ static u32 dsi_clk_from_pclk(u32 pclk, int pixel_format, int lane_count)
 
 #endif
 
-static int dsi_calc_mnp(u32 dsi_clk, struct dsi_mnp *dsi_mnp)
+static int dsi_calc_mnp(struct drm_i915_private *dev_priv,
+			struct dsi_mnp *dsi_mnp, int target_dsi_clk)
 {
-	u32 m, n, p;
-	u32 ref_clk;
-	u32 error;
-	u32 tmp_error;
-	int target_dsi_clk;
-	int calc_dsi_clk;
-	u32 calc_m;
-	u32 calc_p;
+	unsigned int calc_m = 0, calc_p = 0;
+	unsigned int m_min, m_max, p_min = 2, p_max = 6;
+	unsigned int m, n, p;
+	int ref_clk;
+	int delta = target_dsi_clk;
 	u32 m_seed;
 
-	/* dsi_clk is expected in KHZ */
-	if (dsi_clk < 300000 || dsi_clk > 1150000) {
+	/* target_dsi_clk is expected in kHz */
+	if (target_dsi_clk < 300000 || target_dsi_clk > 1150000) {
 		DRM_ERROR("DSI CLK Out of Range\n");
 		return -ECHRNG;
 	}
 
-	ref_clk = 25000;
-	target_dsi_clk = dsi_clk;
-	error = 0xFFFFFFFF;
-	tmp_error = 0xFFFFFFFF;
-	calc_m = 0;
-	calc_p = 0;
-
-	for (m = 62; m <= 92; m++) {
-		for (p = 2; p <= 6; p++) {
-			/* Find the optimal m and p divisors
-			   with minimal error +/- the required clock */
-			calc_dsi_clk = (m * ref_clk) / p;
-			if (calc_dsi_clk == target_dsi_clk) {
-				calc_m = m;
-				calc_p = p;
-				error = 0;
-				break;
-			} else
-				tmp_error = abs(target_dsi_clk - calc_dsi_clk);
+	if (IS_CHERRYVIEW(dev_priv)) {
+		ref_clk = 100000;
+		n = 4;
+		m_min = 70;
+		m_max = 96;
+	} else {
+		ref_clk = 25000;
+		n = 1;
+		m_min = 62;
+		m_max = 92;
+	}
 
-			if (tmp_error < error) {
-				error = tmp_error;
+	for (m = m_min; m <= m_max && delta; m++) {
+		for (p = p_min; p <= p_max && delta; p++) {
+			/*
+			 * Find the optimal m and p divisors with minimal delta
+			 * +/- the required clock
+			 */
+			int calc_dsi_clk = (m * ref_clk) / (p * n);
+			int d = abs(target_dsi_clk - calc_dsi_clk);
+			if (d < delta) {
+				delta = d;
 				calc_m = m;
 				calc_p = p;
 			}
 		}
-
-		if (error == 0)
-			break;
 	}
 
+	/* register has log2(N1), this works fine for powers of two */
+	n = ffs(n) - 1;
 	m_seed = lfsr_converts[calc_m - 62];
-	n = 1;
 	dsi_mnp->dsi_pll_ctrl = 1 << (DSI_PLL_P1_POST_DIV_SHIFT + calc_p - 2);
-	dsi_mnp->dsi_pll_div = (n - 1) << DSI_PLL_N1_DIV_SHIFT |
+	dsi_mnp->dsi_pll_div = n << DSI_PLL_N1_DIV_SHIFT |
 		m_seed << DSI_PLL_M1_DIV_SHIFT;
 
 	return 0;
@@ -235,7 +226,7 @@ static void vlv_configure_dsi_pll(struct intel_encoder *encoder)
 	dsi_clk = dsi_clk_from_pclk(intel_dsi->pclk, intel_dsi->pixel_format,
 				    intel_dsi->lane_count);
 
-	ret = dsi_calc_mnp(dsi_clk, &dsi_mnp);
+	ret = dsi_calc_mnp(dev_priv, &dsi_mnp, dsi_clk);
 	if (ret) {
 		DRM_DEBUG_KMS("dsi_calc_mnp failed\n");
 		return;
@@ -255,14 +246,14 @@ static void vlv_configure_dsi_pll(struct intel_encoder *encoder)
 	vlv_cck_write(dev_priv, CCK_REG_DSI_PLL_CONTROL, dsi_mnp.dsi_pll_ctrl);
 }
 
-void vlv_enable_dsi_pll(struct intel_encoder *encoder)
+static void vlv_enable_dsi_pll(struct intel_encoder *encoder)
 {
 	struct drm_i915_private *dev_priv = encoder->base.dev->dev_private;
 	u32 tmp;
 
 	DRM_DEBUG_KMS("\n");
 
-	mutex_lock(&dev_priv->dpio_lock);
+	mutex_lock(&dev_priv->sb_lock);
 
 	vlv_configure_dsi_pll(encoder);
 
@@ -276,49 +267,55 @@ void vlv_enable_dsi_pll(struct intel_encoder *encoder)
 	if (wait_for(vlv_cck_read(dev_priv, CCK_REG_DSI_PLL_CONTROL) &
 						DSI_PLL_LOCK, 20)) {
 
-		mutex_unlock(&dev_priv->dpio_lock);
+		mutex_unlock(&dev_priv->sb_lock);
 		DRM_ERROR("DSI PLL lock failed\n");
 		return;
 	}
-	mutex_unlock(&dev_priv->dpio_lock);
+	mutex_unlock(&dev_priv->sb_lock);
 
 	DRM_DEBUG_KMS("DSI PLL locked\n");
 }
 
-void vlv_disable_dsi_pll(struct intel_encoder *encoder)
+static void vlv_disable_dsi_pll(struct intel_encoder *encoder)
 {
 	struct drm_i915_private *dev_priv = encoder->base.dev->dev_private;
 	u32 tmp;
 
 	DRM_DEBUG_KMS("\n");
 
-	mutex_lock(&dev_priv->dpio_lock);
+	mutex_lock(&dev_priv->sb_lock);
 
 	tmp = vlv_cck_read(dev_priv, CCK_REG_DSI_PLL_CONTROL);
 	tmp &= ~DSI_PLL_VCO_EN;
 	tmp |= DSI_PLL_LDO_GATE;
 	vlv_cck_write(dev_priv, CCK_REG_DSI_PLL_CONTROL, tmp);
 
-	mutex_unlock(&dev_priv->dpio_lock);
+	mutex_unlock(&dev_priv->sb_lock);
 }
 
-static void assert_bpp_mismatch(int pixel_format, int pipe_bpp)
+static void bxt_disable_dsi_pll(struct intel_encoder *encoder)
 {
-	int bpp;
+	struct drm_i915_private *dev_priv = encoder->base.dev->dev_private;
+	u32 val;
 
-	switch (pixel_format) {
-	default:
-	case VID_MODE_FORMAT_RGB888:
-	case VID_MODE_FORMAT_RGB666_LOOSE:
-		bpp = 24;
-		break;
-	case VID_MODE_FORMAT_RGB666:
-		bpp = 18;
-		break;
-	case VID_MODE_FORMAT_RGB565:
-		bpp = 16;
-		break;
-	}
+	DRM_DEBUG_KMS("\n");
+
+	val = I915_READ(BXT_DSI_PLL_ENABLE);
+	val &= ~BXT_DSI_PLL_DO_ENABLE;
+	I915_WRITE(BXT_DSI_PLL_ENABLE, val);
+
+	/*
+	 * PLL lock should deassert within 200us.
+	 * Wait up to 1ms before timing out.
+	 */
+	if (wait_for((I915_READ(BXT_DSI_PLL_ENABLE)
+					& BXT_DSI_PLL_LOCKED) == 0, 1))
+		DRM_ERROR("Timeout waiting for PLL lock deassertion\n");
+}
+
+static void assert_bpp_mismatch(int pixel_format, int pipe_bpp)
+{
+	int bpp = dsi_pixel_format_bpp(pixel_format);
 
 	WARN(bpp != pipe_bpp,
 	     "bpp match assertion failure (expected %d, current %d)\n",
@@ -331,21 +328,25 @@ u32 vlv_get_dsi_pclk(struct intel_encoder *encoder, int pipe_bpp)
 	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;
+	u32 m = 0, p = 0, n;
 	int refclk = 25000;
 	int i;
 
 	DRM_DEBUG_KMS("\n");
 
-	mutex_lock(&dev_priv->dpio_lock);
+	mutex_lock(&dev_priv->sb_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);
+	mutex_unlock(&dev_priv->sb_lock);
 
 	/* mask out other bits and extract the P1 divisor */
 	pll_ctl &= DSI_PLL_P1_POST_DIV_MASK;
 	pll_ctl = pll_ctl >> (DSI_PLL_P1_POST_DIV_SHIFT - 2);
 
+	/* N1 divisor */
+	n = (pll_div & DSI_PLL_N1_DIV_MASK) >> DSI_PLL_N1_DIV_SHIFT;
+	n = 1 << n; /* register has log2(N1) */
+
 	/* mask out the other bits and extract the M1 divisor */
 	pll_div &= DSI_PLL_M1_DIV_MASK;
 	pll_div = pll_div >> DSI_PLL_M1_DIV_SHIFT;
@@ -373,7 +374,7 @@ u32 vlv_get_dsi_pclk(struct intel_encoder *encoder, int pipe_bpp)
 
 	m = i + 62;
 
-	dsi_clock = (m * refclk) / p;
+	dsi_clock = (m * refclk) / (p * n);
 
 	/* pixel_format and pipe_bpp should agree */
 	assert_bpp_mismatch(intel_dsi->pixel_format, pipe_bpp);
@@ -382,3 +383,222 @@ u32 vlv_get_dsi_pclk(struct intel_encoder *encoder, int pipe_bpp)
 
 	return pclk;
 }
+
+u32 bxt_get_dsi_pclk(struct intel_encoder *encoder, int pipe_bpp)
+{
+	u32 pclk;
+	u32 dsi_clk;
+	u32 dsi_ratio;
+	struct intel_dsi *intel_dsi = enc_to_intel_dsi(&encoder->base);
+	struct drm_i915_private *dev_priv = encoder->base.dev->dev_private;
+
+	/* Divide by zero */
+	if (!pipe_bpp) {
+		DRM_ERROR("Invalid BPP(0)\n");
+		return 0;
+	}
+
+	dsi_ratio = I915_READ(BXT_DSI_PLL_CTL) &
+				BXT_DSI_PLL_RATIO_MASK;
+
+	/* Invalid DSI ratio ? */
+	if (dsi_ratio < BXT_DSI_PLL_RATIO_MIN ||
+			dsi_ratio > BXT_DSI_PLL_RATIO_MAX) {
+		DRM_ERROR("Invalid DSI pll ratio(%u) programmed\n", dsi_ratio);
+		return 0;
+	}
+
+	dsi_clk = (dsi_ratio * BXT_REF_CLOCK_KHZ) / 2;
+
+	/* pixel_format and pipe_bpp should agree */
+	assert_bpp_mismatch(intel_dsi->pixel_format, pipe_bpp);
+
+	pclk = DIV_ROUND_CLOSEST(dsi_clk * intel_dsi->lane_count, pipe_bpp);
+
+	DRM_DEBUG_DRIVER("Calculated pclk=%u\n", pclk);
+	return pclk;
+}
+
+static void vlv_dsi_reset_clocks(struct intel_encoder *encoder, enum port port)
+{
+	u32 temp;
+	struct drm_i915_private *dev_priv = encoder->base.dev->dev_private;
+	struct intel_dsi *intel_dsi = enc_to_intel_dsi(&encoder->base);
+
+	temp = I915_READ(MIPI_CTRL(port));
+	temp &= ~ESCAPE_CLOCK_DIVIDER_MASK;
+	I915_WRITE(MIPI_CTRL(port), temp |
+			intel_dsi->escape_clk_div <<
+			ESCAPE_CLOCK_DIVIDER_SHIFT);
+}
+
+/* Program BXT Mipi clocks and dividers */
+static void bxt_dsi_program_clocks(struct drm_device *dev, enum port port)
+{
+	u32 tmp;
+	u32 divider;
+	u32 dsi_rate;
+	u32 pll_ratio;
+	struct drm_i915_private *dev_priv = dev->dev_private;
+
+	/* Clear old configurations */
+	tmp = I915_READ(BXT_MIPI_CLOCK_CTL);
+	tmp &= ~(BXT_MIPI_TX_ESCLK_FIXDIV_MASK(port));
+	tmp &= ~(BXT_MIPI_RX_ESCLK_FIXDIV_MASK(port));
+	tmp &= ~(BXT_MIPI_ESCLK_VAR_DIV_MASK(port));
+	tmp &= ~(BXT_MIPI_DPHY_DIVIDER_MASK(port));
+
+	/* Get the current DSI rate(actual) */
+	pll_ratio = I915_READ(BXT_DSI_PLL_CTL) &
+				BXT_DSI_PLL_RATIO_MASK;
+	dsi_rate = (BXT_REF_CLOCK_KHZ * pll_ratio) / 2;
+
+	/* Max possible output of clock is 39.5 MHz, program value -1 */
+	divider = (dsi_rate / BXT_MAX_VAR_OUTPUT_KHZ) - 1;
+	tmp |= BXT_MIPI_ESCLK_VAR_DIV(port, divider);
+
+	/*
+	 * Tx escape clock must be as close to 20MHz possible, but should
+	 * not exceed it. Hence select divide by 2
+	 */
+	tmp |= BXT_MIPI_TX_ESCLK_8XDIV_BY2(port);
+
+	tmp |= BXT_MIPI_RX_ESCLK_8X_BY3(port);
+
+	I915_WRITE(BXT_MIPI_CLOCK_CTL, tmp);
+}
+
+static bool bxt_configure_dsi_pll(struct intel_encoder *encoder)
+{
+	struct drm_i915_private *dev_priv = encoder->base.dev->dev_private;
+	struct intel_dsi *intel_dsi = enc_to_intel_dsi(&encoder->base);
+	u8 dsi_ratio;
+	u32 dsi_clk;
+	u32 val;
+
+	dsi_clk = dsi_clk_from_pclk(intel_dsi->pclk, intel_dsi->pixel_format,
+			intel_dsi->lane_count);
+
+	/*
+	 * From clock diagram, to get PLL ratio divider, divide double of DSI
+	 * link rate (i.e., 2*8x=16x frequency value) by ref clock. Make sure to
+	 * round 'up' the result
+	 */
+	dsi_ratio = DIV_ROUND_UP(dsi_clk * 2, BXT_REF_CLOCK_KHZ);
+	if (dsi_ratio < BXT_DSI_PLL_RATIO_MIN ||
+			dsi_ratio > BXT_DSI_PLL_RATIO_MAX) {
+		DRM_ERROR("Cant get a suitable ratio from DSI PLL ratios\n");
+		return false;
+	}
+
+	/*
+	 * Program DSI ratio and Select MIPIC and MIPIA PLL output as 8x
+	 * Spec says both have to be programmed, even if one is not getting
+	 * used. Configure MIPI_CLOCK_CTL dividers in modeset
+	 */
+	val = I915_READ(BXT_DSI_PLL_CTL);
+	val &= ~BXT_DSI_PLL_PVD_RATIO_MASK;
+	val &= ~BXT_DSI_FREQ_SEL_MASK;
+	val &= ~BXT_DSI_PLL_RATIO_MASK;
+	val |= (dsi_ratio | BXT_DSIA_16X_BY2 | BXT_DSIC_16X_BY2);
+
+	/* As per recommendation from hardware team,
+	 * Prog PVD ratio =1 if dsi ratio <= 50
+	 */
+	if (dsi_ratio <= 50) {
+		val &= ~BXT_DSI_PLL_PVD_RATIO_MASK;
+		val |= BXT_DSI_PLL_PVD_RATIO_1;
+	}
+
+	I915_WRITE(BXT_DSI_PLL_CTL, val);
+	POSTING_READ(BXT_DSI_PLL_CTL);
+
+	return true;
+}
+
+static void bxt_enable_dsi_pll(struct intel_encoder *encoder)
+{
+	struct drm_i915_private *dev_priv = encoder->base.dev->dev_private;
+	struct intel_dsi *intel_dsi = enc_to_intel_dsi(&encoder->base);
+	enum port port;
+	u32 val;
+
+	DRM_DEBUG_KMS("\n");
+
+	val = I915_READ(BXT_DSI_PLL_ENABLE);
+
+	if (val & BXT_DSI_PLL_DO_ENABLE) {
+		WARN(1, "DSI PLL already enabled. Disabling it.\n");
+		val &= ~BXT_DSI_PLL_DO_ENABLE;
+		I915_WRITE(BXT_DSI_PLL_ENABLE, val);
+	}
+
+	/* Configure PLL vales */
+	if (!bxt_configure_dsi_pll(encoder)) {
+		DRM_ERROR("Configure DSI PLL failed, abort PLL enable\n");
+		return;
+	}
+
+	/* Program TX, RX, Dphy clocks */
+	for_each_dsi_port(port, intel_dsi->ports)
+		bxt_dsi_program_clocks(encoder->base.dev, port);
+
+	/* Enable DSI PLL */
+	val = I915_READ(BXT_DSI_PLL_ENABLE);
+	val |= BXT_DSI_PLL_DO_ENABLE;
+	I915_WRITE(BXT_DSI_PLL_ENABLE, val);
+
+	/* Timeout and fail if PLL not locked */
+	if (wait_for(I915_READ(BXT_DSI_PLL_ENABLE) & BXT_DSI_PLL_LOCKED, 1)) {
+		DRM_ERROR("Timed out waiting for DSI PLL to lock\n");
+		return;
+	}
+
+	DRM_DEBUG_KMS("DSI PLL locked\n");
+}
+
+void intel_enable_dsi_pll(struct intel_encoder *encoder)
+{
+	struct drm_device *dev = encoder->base.dev;
+
+	if (IS_VALLEYVIEW(dev))
+		vlv_enable_dsi_pll(encoder);
+	else if (IS_BROXTON(dev))
+		bxt_enable_dsi_pll(encoder);
+}
+
+void intel_disable_dsi_pll(struct intel_encoder *encoder)
+{
+	struct drm_device *dev = encoder->base.dev;
+
+	if (IS_VALLEYVIEW(dev))
+		vlv_disable_dsi_pll(encoder);
+	else if (IS_BROXTON(dev))
+		bxt_disable_dsi_pll(encoder);
+}
+
+static void bxt_dsi_reset_clocks(struct intel_encoder *encoder, enum port port)
+{
+	u32 tmp;
+	struct drm_device *dev = encoder->base.dev;
+	struct drm_i915_private *dev_priv = dev->dev_private;
+
+	/* Clear old configurations */
+	tmp = I915_READ(BXT_MIPI_CLOCK_CTL);
+	tmp &= ~(BXT_MIPI_TX_ESCLK_FIXDIV_MASK(port));
+	tmp &= ~(BXT_MIPI_RX_ESCLK_FIXDIV_MASK(port));
+	tmp &= ~(BXT_MIPI_ESCLK_VAR_DIV_MASK(port));
+	tmp &= ~(BXT_MIPI_DPHY_DIVIDER_MASK(port));
+	I915_WRITE(BXT_MIPI_CLOCK_CTL, tmp);
+	I915_WRITE(MIPI_EOT_DISABLE(port), CLOCKSTOP);
+}
+
+void intel_dsi_reset_clocks(struct intel_encoder *encoder, enum port port)
+{
+	struct drm_device *dev = encoder->base.dev;
+
+	if (IS_BROXTON(dev))
+		bxt_dsi_reset_clocks(encoder, port);
+	else if (IS_VALLEYVIEW(dev))
+		vlv_dsi_reset_clocks(encoder, port);
+}