gma500/cdv: Add eDP support

Introduce the eDP support into the driver.

This has been reworked a bit because kernel driver proper uses encoder/connectors
while the legacy Intel driver uses the old output stuff.

It also diverges on the backlight handling. The legacy Intel driver adds a panel
abstraction based upon the i915 one. It's only really used for backlight bits
and we have a perfectly good backlight abstraction which can extend instead.
Signed-off-by: NZhao Yakui <yakui.zhao@intel.com>
[ported to upstream driver, redid backlight abstraction]
Signed-off-by: NAlan Cox <alan@linux.intel.com>
Signed-off-by: NDave Airlie <airlied@redhat.com>

drivers/gpu/drm/gma500/backlight.c

@@ -26,10 +26,55 @@
 #include "intel_bios.h"
 #include "power.h"
 
+static void do_gma_backlight_set(struct drm_device *dev)
+{
+#ifdef CONFIG_BACKLIGHT_CLASS_DEVICE
+	struct drm_psb_private *dev_priv = dev->dev_private;
+	backlight_update_status(dev_priv->backlight_device);
+#endif	
+}
+
+void gma_backlight_enable(struct drm_device *dev)
+{
+#ifdef CONFIG_BACKLIGHT_CLASS_DEVICE
+	struct drm_psb_private *dev_priv = dev->dev_private;
+	dev_priv->backlight_enabled = true;
+	if (dev_priv->backlight_device) {
+		dev_priv->backlight_device->props.brightness = dev_priv->backlight_level;
+		do_gma_backlight_set(dev);
+	}
+#endif	
+}
+
+void gma_backlight_disable(struct drm_device *dev)
+{
+#ifdef CONFIG_BACKLIGHT_CLASS_DEVICE
+	struct drm_psb_private *dev_priv = dev->dev_private;
+	dev_priv->backlight_enabled = false;
+	if (dev_priv->backlight_device) {
+		dev_priv->backlight_device->props.brightness = 0;
+		do_gma_backlight_set(dev);
+	}
+#endif	
+}
+
+void gma_backlight_set(struct drm_device *dev, int v)
+{
+#ifdef CONFIG_BACKLIGHT_CLASS_DEVICE
+	struct drm_psb_private *dev_priv = dev->dev_private;
+	dev_priv->backlight_level = v;
+	if (dev_priv->backlight_device && dev_priv->backlight_enabled) {
+		dev_priv->backlight_device->props.brightness = v;
+		do_gma_backlight_set(dev);
+	}
+#endif	
+}
+
 int gma_backlight_init(struct drm_device *dev)
 {
 #ifdef CONFIG_BACKLIGHT_CLASS_DEVICE
 	struct drm_psb_private *dev_priv = dev->dev_private;
+	dev_priv->backlight_enabled = true;
 	return dev_priv->ops->backlight_init(dev);
 #else
 	return 0;

drivers/gpu/drm/gma500/cdv_device.c

@@ -170,6 +170,7 @@ static int cdv_backlight_init(struct drm_device *dev)
 			cdv_get_brightness(cdv_backlight_device);
 	backlight_update_status(cdv_backlight_device);
 	dev_priv->backlight_device = cdv_backlight_device;
+	dev_priv->backlight_enabled = true;
 	return 0;
 }
 

drivers/gpu/drm/gma500/cdv_intel_display.c

@@ -438,7 +438,8 @@ static const struct cdv_intel_limit_t *cdv_intel_limit(struct drm_crtc *crtc,
 			limit = &cdv_intel_limits[CDV_LIMIT_SINGLE_LVDS_96];
 		else
 			limit = &cdv_intel_limits[CDV_LIMIT_SINGLE_LVDS_100];
-	} else if (psb_intel_pipe_has_type(crtc, INTEL_OUTPUT_DISPLAYPORT)) {
+	} else if (psb_intel_pipe_has_type(crtc, INTEL_OUTPUT_DISPLAYPORT) ||
+			psb_intel_pipe_has_type(crtc, INTEL_OUTPUT_EDP)) {
 		if (refclk == 27000)
 			limit = &cdv_intel_limits[CDV_LIMIT_DP_27];
 		else
@@ -1045,6 +1046,7 @@ static int cdv_intel_crtc_mode_set(struct drm_crtc *crtc,
 	struct drm_connector *connector;
 	const struct cdv_intel_limit_t *limit;
 	u32 ddi_select = 0;
+	bool is_edp = false;
 
 	list_for_each_entry(connector, &mode_config->connector_list, head) {
 		struct psb_intel_encoder *psb_intel_encoder =
@@ -1071,6 +1073,9 @@ static int cdv_intel_crtc_mode_set(struct drm_crtc *crtc,
 		case INTEL_OUTPUT_DISPLAYPORT:
 			is_dp = true;
 			break;
+		case INTEL_OUTPUT_EDP:
+			is_edp = true;
+			break;
 		default:
 			DRM_ERROR("invalid output type.\n");
 			return 0;
@@ -1083,7 +1088,15 @@ static int cdv_intel_crtc_mode_set(struct drm_crtc *crtc,
 	else
 		/* high-end sku, 27/100 mhz */
 		refclk = 27000;
-	if (is_dp) {
+	if (is_dp || is_edp) {
+		/*
+		 * Based on the spec the low-end SKU has only CRT/LVDS. So it is
+		 * unnecessary to consider it for DP/eDP.
+		 * On the high-end SKU, it will use the 27/100M reference clk
+		 * for DP/eDP. When using SSC clock, the ref clk is 100MHz.Otherwise
+		 * it will be 27MHz. From the VBIOS code it seems that the pipe A choose
+		 * 27MHz for DP/eDP while the Pipe B chooses the 100MHz.
+		 */ 
 		if (pipe == 0)
 			refclk = 27000;
 		else
@@ -1133,6 +1146,31 @@ static int cdv_intel_crtc_mode_set(struct drm_crtc *crtc,
 	/* setup pipeconf */
 	pipeconf = REG_READ(map->conf);
 
+	pipeconf &= ~(PIPE_BPC_MASK);
+	if (is_edp) {
+		switch (dev_priv->edp.bpp) {
+		case 24:
+			pipeconf |= PIPE_8BPC;
+			break;
+		case 18:
+			pipeconf |= PIPE_6BPC;
+			break;
+		case 30:
+			pipeconf |= PIPE_10BPC;
+			break;
+		default:
+			pipeconf |= PIPE_8BPC;
+			break;
+		}
+	} else if (is_lvds) {
+		/* the BPC will be 6 if it is 18-bit LVDS panel */
+		if ((REG_READ(LVDS) & LVDS_A3_POWER_MASK) == LVDS_A3_POWER_UP)
+			pipeconf |= PIPE_8BPC;
+		else
+			pipeconf |= PIPE_6BPC;
+	} else
+		pipeconf |= PIPE_8BPC;
+			
 	/* Set up the display plane register */
 	dspcntr = DISPPLANE_GAMMA_ENABLE;
 

drivers/gpu/drm/gma500/cdv_intel_lvds.c

@@ -506,16 +506,8 @@ static int cdv_intel_lvds_set_property(struct drm_connector *connector,
 							property,
 							value))
 			return -1;
-		else {
-#ifdef CONFIG_BACKLIGHT_CLASS_DEVICE
-			struct drm_psb_private *dev_priv =
-						encoder->dev->dev_private;
-			struct backlight_device *bd =
-						dev_priv->backlight_device;
-			bd->props.brightness = value;
-			backlight_update_status(bd);
-#endif
-		}
+		else
+                        gma_backlight_set(encoder->dev, value);
 	} else if (!strcmp(property->name, "DPMS") && encoder) {
 		struct drm_encoder_helper_funcs *helpers =
 					encoder->helper_private;

drivers/gpu/drm/gma500/framebuffer.c

@@ -768,6 +768,9 @@ static void psb_setup_outputs(struct drm_device *dev)
 			crtc_mask = (1 << 0) | (1 << 1);
 			clone_mask = (1 << INTEL_OUTPUT_DISPLAYPORT);
 			break;
+		case INTEL_OUTPUT_EDP:
+			crtc_mask = (1 << 1);
+			clone_mask = (1 << INTEL_OUTPUT_EDP);
 		}
 		encoder->possible_crtcs = crtc_mask;
 		encoder->possible_clones =

drivers/gpu/drm/gma500/intel_bios.c

@@ -54,6 +54,98 @@ static void *find_section(struct bdb_header *bdb, int section_id)
 	return NULL;
 }
 
+static void
+parse_edp(struct drm_psb_private *dev_priv, struct bdb_header *bdb)
+{
+	struct bdb_edp *edp;
+	struct edp_power_seq *edp_pps;
+	struct edp_link_params *edp_link_params;
+	uint8_t	panel_type;
+
+	edp = find_section(bdb, BDB_EDP);
+	
+	dev_priv->edp.bpp = 18;
+	if (!edp) {
+		if (dev_priv->edp.support) {
+			DRM_DEBUG_KMS("No eDP BDB found but eDP panel supported, assume %dbpp panel color depth.\n",
+				      dev_priv->edp.bpp);
+		}
+		return;
+	}
+
+	panel_type = dev_priv->panel_type;
+	switch ((edp->color_depth >> (panel_type * 2)) & 3) {
+	case EDP_18BPP:
+		dev_priv->edp.bpp = 18;
+		break;
+	case EDP_24BPP:
+		dev_priv->edp.bpp = 24;
+		break;
+	case EDP_30BPP:
+		dev_priv->edp.bpp = 30;
+		break;
+	}
+
+	/* Get the eDP sequencing and link info */
+	edp_pps = &edp->power_seqs[panel_type];
+	edp_link_params = &edp->link_params[panel_type];
+
+	dev_priv->edp.pps = *edp_pps;
+
+	DRM_DEBUG_KMS("EDP timing in vbt t1_t3 %d t8 %d t9 %d t10 %d t11_t12 %d\n",
+				dev_priv->edp.pps.t1_t3, dev_priv->edp.pps.t8, 
+				dev_priv->edp.pps.t9, dev_priv->edp.pps.t10,
+				dev_priv->edp.pps.t11_t12);
+
+	dev_priv->edp.rate = edp_link_params->rate ? DP_LINK_BW_2_7 :
+		DP_LINK_BW_1_62;
+	switch (edp_link_params->lanes) {
+	case 0:
+		dev_priv->edp.lanes = 1;
+		break;
+	case 1:
+		dev_priv->edp.lanes = 2;
+		break;
+	case 3:
+	default:
+		dev_priv->edp.lanes = 4;
+		break;
+	}
+	DRM_DEBUG_KMS("VBT reports EDP: Lane_count %d, Lane_rate %d, Bpp %d\n",
+			dev_priv->edp.lanes, dev_priv->edp.rate, dev_priv->edp.bpp);
+
+	switch (edp_link_params->preemphasis) {
+	case 0:
+		dev_priv->edp.preemphasis = DP_TRAIN_PRE_EMPHASIS_0;
+		break;
+	case 1:
+		dev_priv->edp.preemphasis = DP_TRAIN_PRE_EMPHASIS_3_5;
+		break;
+	case 2:
+		dev_priv->edp.preemphasis = DP_TRAIN_PRE_EMPHASIS_6;
+		break;
+	case 3:
+		dev_priv->edp.preemphasis = DP_TRAIN_PRE_EMPHASIS_9_5;
+		break;
+	}
+	switch (edp_link_params->vswing) {
+	case 0:
+		dev_priv->edp.vswing = DP_TRAIN_VOLTAGE_SWING_400;
+		break;
+	case 1:
+		dev_priv->edp.vswing = DP_TRAIN_VOLTAGE_SWING_600;
+		break;
+	case 2:
+		dev_priv->edp.vswing = DP_TRAIN_VOLTAGE_SWING_800;
+		break;
+	case 3:
+		dev_priv->edp.vswing = DP_TRAIN_VOLTAGE_SWING_1200;
+		break;
+	}
+	DRM_DEBUG_KMS("VBT reports EDP: VSwing  %d, Preemph %d\n",
+			dev_priv->edp.vswing, dev_priv->edp.preemphasis);
+}
+
 static u16
 get_blocksize(void *p)
 {
@@ -154,6 +246,8 @@ static void parse_lfp_panel_data(struct drm_psb_private *dev_priv,
 		return;
 
 	dev_priv->lvds_dither = lvds_options->pixel_dither;
+	dev_priv->panel_type = lvds_options->panel_type;
+
 	if (lvds_options->panel_type == 0xff)
 		return;
 
@@ -340,6 +434,9 @@ parse_driver_features(struct drm_psb_private *dev_priv,
 	if (!driver)
 		return;
 
+	if (driver->lvds_config == BDB_DRIVER_FEATURE_EDP)
+		dev_priv->edp.support = 1;
+
 	/* This bit means to use 96Mhz for DPLL_A or not */
 	if (driver->primary_lfp_id)
 		dev_priv->dplla_96mhz = true;
@@ -437,6 +534,9 @@ int psb_intel_init_bios(struct drm_device *dev)
 	size_t size;
 	int i;
 
+
+	dev_priv->panel_type = 0xff;
+
 	/* XXX Should this validation be moved to intel_opregion.c? */
 	if (dev_priv->opregion.vbt) {
 		struct vbt_header *vbt = dev_priv->opregion.vbt;
@@ -477,6 +577,7 @@ int psb_intel_init_bios(struct drm_device *dev)
 	parse_sdvo_device_mapping(dev_priv, bdb);
 	parse_device_mapping(dev_priv, bdb);
 	parse_backlight_data(dev_priv, bdb);
+	parse_edp(dev_priv, bdb);
 
 	if (bios)
 		pci_unmap_rom(pdev, bios);

drivers/gpu/drm/gma500/intel_bios.h

@@ -23,6 +23,7 @@
 #define _I830_BIOS_H_
 
 #include <drm/drmP.h>
+#include <drm/drm_dp_helper.h>
 
 struct vbt_header {
 	u8 signature[20];		/**< Always starts with 'VBT$' */
@@ -93,6 +94,7 @@ struct vbios_data {
 #define BDB_SDVO_LVDS_PNP_IDS	 24
 #define BDB_SDVO_LVDS_POWER_SEQ	 25
 #define BDB_TV_OPTIONS		 26
+#define BDB_EDP			 27
 #define BDB_LVDS_OPTIONS	 40
 #define BDB_LVDS_LFP_DATA_PTRS	 41
 #define BDB_LVDS_LFP_DATA	 42
@@ -391,6 +393,11 @@ struct bdb_sdvo_lvds_options {
 	u8 panel_misc_bits_4;
 } __attribute__((packed));
 
+#define BDB_DRIVER_FEATURE_NO_LVDS		0
+#define BDB_DRIVER_FEATURE_INT_LVDS		1
+#define BDB_DRIVER_FEATURE_SDVO_LVDS		2
+#define BDB_DRIVER_FEATURE_EDP			3
+
 struct bdb_driver_features {
 	u8 boot_dev_algorithm:1;
 	u8 block_display_switch:1;
@@ -431,6 +438,45 @@ struct bdb_driver_features {
 	u8 custom_vbt_version;
 } __attribute__((packed));
 
+#define EDP_18BPP	0
+#define EDP_24BPP	1
+#define EDP_30BPP	2
+#define EDP_RATE_1_62	0
+#define EDP_RATE_2_7	1
+#define EDP_LANE_1	0
+#define EDP_LANE_2	1
+#define EDP_LANE_4	3
+#define EDP_PREEMPHASIS_NONE	0
+#define EDP_PREEMPHASIS_3_5dB	1
+#define EDP_PREEMPHASIS_6dB	2
+#define EDP_PREEMPHASIS_9_5dB	3
+#define EDP_VSWING_0_4V		0
+#define EDP_VSWING_0_6V		1
+#define EDP_VSWING_0_8V		2
+#define EDP_VSWING_1_2V		3
+
+struct edp_power_seq {
+	u16 t1_t3;
+	u16 t8;
+	u16 t9;
+	u16 t10;
+	u16 t11_t12;
+} __attribute__ ((packed));
+
+struct edp_link_params {
+	u8 rate:4;
+	u8 lanes:4;
+	u8 preemphasis:4;
+	u8 vswing:4;
+} __attribute__ ((packed));
+
+struct bdb_edp {
+	struct edp_power_seq power_seqs[16];
+	u32 color_depth;
+	u32 sdrrs_msa_timing_delay;
+	struct edp_link_params link_params[16];
+} __attribute__ ((packed));
+
 extern int psb_intel_init_bios(struct drm_device *dev);
 extern void psb_intel_destroy_bios(struct drm_device *dev);
 

drivers/gpu/drm/gma500/mdfld_dsi_output.c

@@ -299,17 +299,8 @@ static int mdfld_dsi_connector_set_property(struct drm_connector *connector,
 		if (drm_connector_property_set_value(connector, property,
 									value))
 			goto set_prop_error;
-		else {
-#ifdef CONFIG_BACKLIGHT_CLASS_DEVICE
-			struct backlight_device *psb_bd;
-
-			psb_bd = mdfld_get_backlight_device();
-			if (psb_bd) {
-				psb_bd->props.brightness = value;
-				mdfld_set_brightness(psb_bd);
-			}
-#endif
-		}
+		else
+			gma_backlight_set(encoder->dev, value);
 	}
 set_prop_done:
 	return 0;

drivers/gpu/drm/gma500/mid_bios.c

@@ -118,20 +118,20 @@ static void mid_get_pci_revID(struct drm_psb_private *dev_priv)
 					dev_priv->platform_rev_id);
 }
 
-struct vbt_header {
+struct mid_vbt_header {
 	u32 signature;
 	u8 revision;
 } __packed;
 
 /* The same for r0 and r1 */
 struct vbt_r0 {
-	struct vbt_header vbt_header;
+	struct mid_vbt_header vbt_header;
 	u8 size;
 	u8 checksum;
 } __packed;
 
 struct vbt_r10 {
-	struct vbt_header vbt_header;
+	struct mid_vbt_header vbt_header;
 	u8 checksum;
 	u16 size;
 	u8 panel_count;
@@ -281,7 +281,7 @@ static void mid_get_vbt_data(struct drm_psb_private *dev_priv)
 	struct drm_device *dev = dev_priv->dev;
 	u32 addr;
 	u8 __iomem *vbt_virtual;
-	struct vbt_header vbt_header;
+	struct mid_vbt_header vbt_header;
 	struct pci_dev *pci_gfx_root = pci_get_bus_and_slot(0, PCI_DEVFN(2, 0));
 	int ret = -1;
 

drivers/gpu/drm/gma500/opregion.c

@@ -166,8 +166,7 @@ static u32 asle_set_backlight(struct drm_device *dev, u32 bclp)
 
 	if (config_enabled(CONFIG_BACKLIGHT_CLASS_DEVICE)) {
 		int max = bd->props.max_brightness;
-		bd->props.brightness = bclp * max / 255;
-		backlight_update_status(bd);
+		gma_backlight_set(dev, bclp * max / 255);
 	}
 
 	asle->cblv = (bclp * 0x64) / 0xff | ASLE_CBLV_VALID;

drivers/gpu/drm/gma500/psb_drv.h

@@ -28,6 +28,7 @@
 #include "gma_drm.h"
 #include "psb_reg.h"
 #include "psb_intel_drv.h"
+#include "intel_bios.h"
 #include "gtt.h"
 #include "power.h"
 #include "opregion.h"
@@ -613,6 +614,8 @@ struct drm_psb_private {
 	 */
 	struct backlight_device *backlight_device;
 	struct drm_property *backlight_property;
+	bool backlight_enabled;
+	int backlight_level;
 	uint32_t blc_adj1;
 	uint32_t blc_adj2;
 
@@ -640,6 +643,19 @@ struct drm_psb_private {
 	int mdfld_panel_id;
 
 	bool dplla_96mhz;	/* DPLL data from the VBT */
+
+	struct {
+		int rate;
+		int lanes;
+		int preemphasis;
+		int vswing;
+
+		bool initialized;
+		bool support;
+		int bpp;
+		struct edp_power_seq pps;
+	} edp;
+	uint8_t panel_type;
 };
 
 
@@ -796,6 +812,9 @@ extern int psb_fbdev_init(struct drm_device *dev);
 /* backlight.c */
 int gma_backlight_init(struct drm_device *dev);
 void gma_backlight_exit(struct drm_device *dev);
+void gma_backlight_disable(struct drm_device *dev);
+void gma_backlight_enable(struct drm_device *dev);
+void gma_backlight_set(struct drm_device *dev, int v);
 
 /* oaktrail_crtc.c */
 extern const struct drm_crtc_helper_funcs oaktrail_helper_funcs;

drivers/gpu/drm/gma500/psb_intel_lvds.c

@@ -630,17 +630,8 @@ int psb_intel_lvds_set_property(struct drm_connector *connector,
 							property,
 							value))
 			goto set_prop_error;
-		else {
-#ifdef CONFIG_BACKLIGHT_CLASS_DEVICE
-			struct drm_psb_private *devp =
-						encoder->dev->dev_private;
-			struct backlight_device *bd = devp->backlight_device;
-			if (bd) {
-				bd->props.brightness = value;
-				backlight_update_status(bd);
-			}
-#endif
-		}
+		else
+                        gma_backlight_set(encoder->dev, value);
 	} else if (!strcmp(property->name, "DPMS")) {
 		struct drm_encoder_helper_funcs *hfuncs
 						= encoder->helper_private;

drivers/gpu/drm/gma500/psb_intel_reg.h

@@ -173,15 +173,46 @@
 #define PP_SEQUENCE_ON			(1 << 28)
 #define PP_SEQUENCE_OFF			(2 << 28)
 #define PP_SEQUENCE_MASK		0x30000000
+#define	PP_CYCLE_DELAY_ACTIVE		(1 << 27)
+#define	PP_SEQUENCE_STATE_ON_IDLE	(1 << 3)
+#define	PP_SEQUENCE_STATE_MASK		0x0000000f
+
 #define PP_CONTROL		0x61204
 #define POWER_TARGET_ON			(1 << 0)
-
+#define	PANEL_UNLOCK_REGS		(0xabcd << 16)
+#define	PANEL_UNLOCK_MASK		(0xffff << 16)
+#define	EDP_FORCE_VDD			(1 << 3)
+#define	EDP_BLC_ENABLE			(1 << 2)
+#define	PANEL_POWER_RESET		(1 << 1)
+#define	PANEL_POWER_OFF			(0 << 0)
+#define	PANEL_POWER_ON			(1 << 0)
+
+/* Poulsbo/Oaktrail */
 #define LVDSPP_ON		0x61208
 #define LVDSPP_OFF		0x6120c
 #define PP_CYCLE		0x61210
 
+/* Cedartrail */
 #define PP_ON_DELAYS		0x61208		/* Cedartrail */
+#define PANEL_PORT_SELECT_MASK 		(3 << 30)
+#define PANEL_PORT_SELECT_LVDS 		(0 << 30)
+#define PANEL_PORT_SELECT_EDP		(1 << 30)
+#define PANEL_POWER_UP_DELAY_MASK	(0x1fff0000)
+#define PANEL_POWER_UP_DELAY_SHIFT	16
+#define PANEL_LIGHT_ON_DELAY_MASK	(0x1fff)
+#define PANEL_LIGHT_ON_DELAY_SHIFT	0
+
 #define PP_OFF_DELAYS		0x6120c		/* Cedartrail */
+#define PANEL_POWER_DOWN_DELAY_MASK	(0x1fff0000)
+#define PANEL_POWER_DOWN_DELAY_SHIFT	16
+#define PANEL_LIGHT_OFF_DELAY_MASK	(0x1fff)
+#define PANEL_LIGHT_OFF_DELAY_SHIFT	0
+
+#define PP_DIVISOR		0x61210		/* Cedartrail */
+#define  PP_REFERENCE_DIVIDER_MASK	(0xffffff00)
+#define  PP_REFERENCE_DIVIDER_SHIFT	8
+#define  PANEL_POWER_CYCLE_DELAY_MASK	(0x1f)
+#define  PANEL_POWER_CYCLE_DELAY_SHIFT	0
 
 #define PFIT_CONTROL		0x61230
 #define PFIT_ENABLE			(1 << 31)
@@ -1503,4 +1534,9 @@ No status bits are changed.
 #define PIPE_DP_LINK_M(pipe) _PIPE(pipe, _PIPEA_DP_LINK_M, _PIPEB_DP_LINK_M)
 #define PIPE_DP_LINK_N(pipe) _PIPE(pipe, _PIPEA_DP_LINK_N, _PIPEB_DP_LINK_N)
 
+#define   PIPE_BPC_MASK				(7 << 5)
+#define   PIPE_8BPC				(0 << 5)
+#define   PIPE_10BPC				(1 << 5)
+#define   PIPE_6BPC				(2 << 5)
+
 #endif