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From:   Kiran Gunda <kgunda@codeaurora.org>
To:     bjorn.andersson@linaro.org, jingoohan1@gmail.com,
        lee.jones@linaro.org, b.zolnierkie@samsung.com,
        dri-devel@lists.freedesktop.org, daniel.thompson@linaro.org,
        jacek.anaszewski@gmail.com, pavel@ucw.cz, robh+dt@kernel.org,
        mark.rutland@arm.com, linux-leds@vger.kernel.org,
        devicetree@vger.kernel.org, linux-kernel@vger.kernel.org,
        Dan Murphy <dmurphy@ti.com>, Andy Gross <agross@kernel.org>,
        linux-arm-msm@vger.kernel.org, linux-fbdev@vger.kernel.org
Cc:     Kiran Gunda <kgunda@codeaurora.org>
Subject: [PATCH V3 3/4] backlight: qcom-wled: Add support for WLED5 peripheral in PM8150L
Date:   Mon,  9 Mar 2020 18:56:01 +0530
Message-Id: <1583760362-26978-4-git-send-email-kgunda@codeaurora.org>
In-Reply-To: <1583760362-26978-1-git-send-email-kgunda@codeaurora.org>
References: <1583760362-26978-1-git-send-email-kgunda@codeaurora.org>
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

Add support for WLED5 peripheral that is present on PM8150L PMICs.

PM8150L WLED supports the following:
    - Two modulators and each sink can use any of the modulator
    - Multiple CABC selection options
    - Multiple brightness width selection (12 bits to 15 bits)

Signed-off-by: Kiran Gunda <kgunda@codeaurora.org>
---
 .../bindings/leds/backlight/qcom-wled.yaml         |  39 +++
 drivers/video/backlight/qcom-wled.c                | 336 ++++++++++++++++++++-
 2 files changed, 374 insertions(+), 1 deletion(-)

diff --git a/Documentation/devicetree/bindings/leds/backlight/qcom-wled.yaml b/Documentation/devicetree/bindings/leds/backlight/qcom-wled.yaml
index d334f81..e0dadc4 100644
--- a/Documentation/devicetree/bindings/leds/backlight/qcom-wled.yaml
+++ b/Documentation/devicetree/bindings/leds/backlight/qcom-wled.yaml
@@ -20,6 +20,7 @@ properties:
        - qcom,pm8941-wled
        - qcom,pmi8998-wled
        - qcom,pm660l-wled
+       - qcom,pm8150l-wled
 
   reg:
     maxItems: 1
@@ -28,10 +29,23 @@ properties:
     maxItems: 1
     description:
       brightness value on boot, value from 0-4095.
+      For pm8150l this value vary from 0-4095 or 0-32767
+      depending on the brightness control mode. If CABC is
+      enabled 0-4095 range is used.
     allOf:
       - $ref: /schemas/types.yaml#/definitions/uint32
         default: 2048
 
+  max-brightness:
+    maxItems: 1
+    description:
+      Maximum brightness level. Allowed values are,
+      for pmi8998 it is  0-4095.
+      For pm8150l, this can be either 4095 or 32767.
+      If CABC is enabled, this is capped to 4095.
+    allOf:
+      - $ref: /schemas/types.yaml#/definitions/uint32
+
   label:
     maxItems: 1
     description:
@@ -124,6 +138,31 @@ properties:
       value for PM8941 from 1 to 3. Default 2
       For PMI8998 from 1 to 4.
 
+  qcom,modulator-sel:
+    maxItems: 1
+    allOf:
+      - $ref: /schemas/types.yaml#/definitions/uint32
+    description:
+      Selects the modulator used for brightness modulation.
+      Allowed values are,
+               0 - Modulator A
+               1 - Modulator B
+      If not specified, then modulator A will be used by default.
+      This property is applicable only to WLED5 peripheral.
+
+  qcom,cabc-sel:
+    maxItems: 1
+    allOf:
+      - $ref: /schemas/types.yaml#/definitions/uint32
+    description:
+      Selects the CABC pin signal used for brightness modulation.
+      Allowed values are,
+              0 - CABC disabled
+              1 - CABC 1
+              2 - CABC 2
+              3 - External signal (e.g. LPG) is used for dimming
+      This property is applicable only to WLED5 peripheral.
+
   interrupts:
     maxItems: 2
     description:
diff --git a/drivers/video/backlight/qcom-wled.c b/drivers/video/backlight/qcom-wled.c
index b73f273..edbbcb2 100644
--- a/drivers/video/backlight/qcom-wled.c
+++ b/drivers/video/backlight/qcom-wled.c
@@ -19,6 +19,8 @@
 #define WLED_DEFAULT_BRIGHTNESS				2048
 #define WLED_SOFT_START_DLY_US				10000
 #define WLED3_SINK_REG_BRIGHT_MAX			0xFFF
+#define WLED5_SINK_REG_BRIGHT_MAX_12B			0xFFF
+#define WLED5_SINK_REG_BRIGHT_MAX_15B			0x7FFF
 
 /* WLED3/WLED4 control registers */
 #define WLED3_CTRL_REG_FAULT_STATUS			0x08
@@ -40,6 +42,7 @@
 
 #define WLED3_CTRL_REG_OVP				0x4d
 #define  WLED3_CTRL_REG_OVP_MASK			GENMASK(1, 0)
+#define  WLED5_CTRL_REG_OVP_MASK			GENMASK(3, 0)
 
 #define WLED3_CTRL_REG_ILIMIT				0x4e
 #define  WLED3_CTRL_REG_ILIMIT_MASK			GENMASK(2, 0)
@@ -101,6 +104,40 @@
 
 #define WLED4_SINK_REG_BRIGHT(n)			(0x57 + (n * 0x10))
 
+/* WLED5 specific sink registers */
+#define WLED5_SINK_REG_MOD_A_EN				0x50
+#define WLED5_SINK_REG_MOD_B_EN				0x60
+#define  WLED5_SINK_REG_MOD_EN_MASK			BIT(7)
+
+#define WLED5_SINK_REG_MOD_A_SRC_SEL			0x51
+#define WLED5_SINK_REG_MOD_B_SRC_SEL			0x61
+#define  WLED5_SINK_REG_MOD_SRC_SEL_HIGH		0
+#define  WLED5_SINK_REG_MOD_SRC_SEL_EXT			0x03
+#define  WLED5_SINK_REG_MOD_SRC_SEL_MASK		GENMASK(1, 0)
+
+#define WLED5_SINK_REG_MOD_A_BRIGHTNESS_WIDTH_SEL	0x52
+#define WLED5_SINK_REG_MOD_B_BRIGHTNESS_WIDTH_SEL	0x62
+#define  WLED5_SINK_REG_BRIGHTNESS_WIDTH_12B		0
+#define  WLED5_SINK_REG_BRIGHTNESS_WIDTH_15B		1
+
+#define WLED5_SINK_REG_MOD_A_BRIGHTNESS_LSB		0x53
+#define WLED5_SINK_REG_MOD_A_BRIGHTNESS_MSB		0x54
+#define WLED5_SINK_REG_MOD_B_BRIGHTNESS_LSB		0x63
+#define WLED5_SINK_REG_MOD_B_BRIGHTNESS_MSB		0x64
+
+#define WLED5_SINK_REG_MOD_SYNC_BIT			0x65
+#define  WLED5_SINK_REG_SYNC_MOD_A_BIT			BIT(0)
+#define  WLED5_SINK_REG_SYNC_MOD_B_BIT			BIT(1)
+#define  WLED5_SINK_REG_SYNC_MASK			GENMASK(1, 0)
+
+/* WLED5 specific per-'string' registers below */
+#define WLED5_SINK_REG_STR_FULL_SCALE_CURR(n)		(0x72 + (n * 0x10))
+
+#define WLED5_SINK_REG_STR_SRC_SEL(n)			(0x73 + (n * 0x10))
+#define  WLED5_SINK_REG_SRC_SEL_MOD_A			0
+#define  WLED5_SINK_REG_SRC_SEL_MOD_B			1
+#define  WLED5_SINK_REG_SRC_SEL_MASK			GENMASK(1, 0)
+
 struct wled_var_cfg {
 	const u32 *values;
 	u32 (*fn)(u32);
@@ -125,6 +162,8 @@ struct wled_config {
 	u32 num_strings;
 	u32 string_i_limit;
 	u32 enabled_strings[WLED_MAX_STRINGS];
+	u32 mod_sel;
+	u32 cabc_sel;
 	bool cs_out_en;
 	bool ext_gen;
 	bool cabc;
@@ -164,6 +203,27 @@ struct wled {
 	int (*wled_ovp_delay)(struct wled *wled);
 };
 
+enum wled5_mod_sel {
+	MOD_A,
+	MOD_B,
+	MOD_MAX,
+};
+
+static const u8 wled5_brightness_reg[MOD_MAX] = {
+	[MOD_A] = WLED5_SINK_REG_MOD_A_BRIGHTNESS_LSB,
+	[MOD_B] = WLED5_SINK_REG_MOD_B_BRIGHTNESS_LSB,
+};
+
+static const u8 wled5_src_sel_reg[MOD_MAX] = {
+	[MOD_A] = WLED5_SINK_REG_MOD_A_SRC_SEL,
+	[MOD_B] = WLED5_SINK_REG_MOD_B_SRC_SEL,
+};
+
+static const u8 wled5_brt_wid_sel_reg[MOD_MAX] = {
+	[MOD_A] = WLED5_SINK_REG_MOD_A_BRIGHTNESS_WIDTH_SEL,
+	[MOD_B] = WLED5_SINK_REG_MOD_B_BRIGHTNESS_WIDTH_SEL,
+};
+
 static int wled3_set_brightness(struct wled *wled, u16 brightness)
 {
 	int rc, i;
@@ -182,6 +242,25 @@ static int wled3_set_brightness(struct wled *wled, u16 brightness)
 	return 0;
 }
 
+static int wled5_set_brightness(struct wled *wled, u16 brightness)
+{
+	int rc, offset;
+	u16 low_limit = wled->max_brightness * 1 / 1000;
+	u8 v[2];
+
+	/* WLED5's lower limit is 0.1% */
+	if (brightness < low_limit)
+		brightness = low_limit;
+
+	v[0] = brightness & 0xff;
+	v[1] = (brightness >> 8) & 0x7f;
+
+	offset = wled5_brightness_reg[wled->cfg.mod_sel];
+	rc = regmap_bulk_write(wled->regmap, wled->sink_addr + offset,
+			       v, 2);
+	return rc;
+}
+
 static int wled4_set_brightness(struct wled *wled, u16 brightness)
 {
 	int rc, i;
@@ -244,6 +323,24 @@ static int wled_module_enable(struct wled *wled, int val)
 	return 0;
 }
 
+static int wled5_sync_toggle(struct wled *wled)
+{
+	int rc;
+	u8 val;
+
+	val = (wled->cfg.mod_sel == MOD_A) ? WLED5_SINK_REG_SYNC_MOD_A_BIT :
+					     WLED5_SINK_REG_SYNC_MOD_B_BIT;
+	rc = regmap_update_bits(wled->regmap,
+				wled->sink_addr + WLED5_SINK_REG_MOD_SYNC_BIT,
+				WLED5_SINK_REG_SYNC_MASK, val);
+	if (rc < 0)
+		return rc;
+
+	return regmap_update_bits(wled->regmap,
+				  wled->sink_addr + WLED5_SINK_REG_MOD_SYNC_BIT,
+				  WLED5_SINK_REG_SYNC_MASK, 0);
+}
+
 static int wled3_sync_toggle(struct wled *wled)
 {
 	int rc;
@@ -345,6 +442,29 @@ static int wled_update_status(struct backlight_device *bl)
 	return rc;
 }
 
+static int wled5_cabc_config(struct wled *wled, bool enable)
+{
+	int rc, offset;
+	u8 reg;
+
+	if (wled->cabc_disabled)
+		return 0;
+
+	reg = enable ? wled->cfg.cabc_sel : 0;
+	offset = wled5_src_sel_reg[wled->cfg.mod_sel];
+	rc = regmap_update_bits(wled->regmap, wled->sink_addr + offset,
+				WLED5_SINK_REG_MOD_SRC_SEL_MASK, reg);
+	if (rc < 0) {
+		pr_err("Error in configuring CABC rc=%d\n", rc);
+		return rc;
+	}
+
+	if (!wled->cfg.cabc_sel)
+		wled->cabc_disabled = true;
+
+	return 0;
+}
+
 static int wled4_cabc_config(struct wled *wled, bool enable)
 {
 	int i, j, rc;
@@ -909,6 +1029,115 @@ static const struct wled_config wled4_config_defaults = {
 	.auto_detection_enabled = false,
 };
 
+static int wled5_setup(struct wled *wled)
+{
+	int rc, temp, i, j;
+	u8 sink_en = 0;
+	u16 addr;
+	u32 val;
+
+	rc = regmap_update_bits(wled->regmap,
+				wled->ctrl_addr + WLED3_CTRL_REG_OVP,
+				WLED5_CTRL_REG_OVP_MASK, wled->cfg.ovp);
+	if (rc < 0)
+		return rc;
+
+	rc = regmap_update_bits(wled->regmap,
+				wled->ctrl_addr + WLED3_CTRL_REG_ILIMIT,
+				WLED3_CTRL_REG_ILIMIT_MASK,
+				wled->cfg.boost_i_limit);
+	if (rc < 0)
+		return rc;
+
+	rc = regmap_update_bits(wled->regmap,
+				wled->ctrl_addr + WLED3_CTRL_REG_FREQ,
+				WLED3_CTRL_REG_FREQ_MASK,
+				wled->cfg.switch_freq);
+	if (rc < 0)
+		return rc;
+
+	/* Per sink/string configuration */
+	for (i = 0; i < wled->cfg.num_strings; ++i) {
+		j = wled->cfg.enabled_strings[i];
+		addr = wled->sink_addr +
+				WLED4_SINK_REG_STR_FULL_SCALE_CURR(j);
+		rc = regmap_update_bits(wled->regmap, addr,
+					WLED4_SINK_REG_STR_FULL_SCALE_CURR_MASK,
+					wled->cfg.string_i_limit);
+		if (rc < 0)
+			return rc;
+
+		addr = wled->sink_addr + WLED5_SINK_REG_STR_SRC_SEL(j);
+		rc = regmap_update_bits(wled->regmap, addr,
+					WLED5_SINK_REG_SRC_SEL_MASK,
+					wled->cfg.mod_sel == MOD_A ?
+					WLED5_SINK_REG_SRC_SEL_MOD_A :
+					WLED5_SINK_REG_SRC_SEL_MOD_B);
+
+		temp = j + WLED4_SINK_REG_CURR_SINK_SHFT;
+		sink_en |= 1 << temp;
+	}
+
+	rc = wled5_cabc_config(wled, wled->cfg.cabc_sel ? true : false);
+	if (rc < 0)
+		return rc;
+
+	/* Enable one of the modulators A or B based on mod_sel */
+	addr = wled->sink_addr + WLED5_SINK_REG_MOD_A_EN;
+	val = (wled->cfg.mod_sel == MOD_A) ? WLED5_SINK_REG_MOD_EN_MASK : 0;
+	rc = regmap_update_bits(wled->regmap, addr,
+				WLED5_SINK_REG_MOD_EN_MASK, val);
+	if (rc < 0)
+		return rc;
+
+	addr = wled->sink_addr + WLED5_SINK_REG_MOD_B_EN;
+	val = (wled->cfg.mod_sel == MOD_B) ? WLED5_SINK_REG_MOD_EN_MASK : 0;
+	rc = regmap_update_bits(wled->regmap, addr,
+				WLED5_SINK_REG_MOD_EN_MASK, val);
+	if (rc < 0)
+		return rc;
+
+	addr = wled->sink_addr + wled5_brt_wid_sel_reg[wled->cfg.mod_sel];
+	val = (wled->max_brightness == WLED5_SINK_REG_BRIGHT_MAX_15B) ?
+		 WLED5_SINK_REG_BRIGHTNESS_WIDTH_15B :
+		 WLED5_SINK_REG_BRIGHTNESS_WIDTH_12B;
+	rc = regmap_write(wled->regmap, addr, val);
+	if (rc < 0)
+		return rc;
+
+	rc = regmap_update_bits(wled->regmap,
+				wled->sink_addr + WLED4_SINK_REG_CURR_SINK,
+				WLED4_SINK_REG_CURR_SINK_MASK, sink_en);
+	if (rc < 0)
+		return rc;
+
+	/* This updates only FSC configuration in WLED5 */
+	rc = wled->wled_sync_toggle(wled);
+	if (rc < 0) {
+		pr_err("Failed to toggle sync reg rc:%d\n", rc);
+		return rc;
+	}
+
+	rc = wled_auto_detection_at_init(wled);
+	if (rc < 0)
+		return rc;
+
+	return 0;
+}
+
+static const struct wled_config wled5_config_defaults = {
+	.boost_i_limit = 5,
+	.string_i_limit = 10,
+	.ovp = 4,
+	.num_strings = 4,
+	.switch_freq = 11,
+	.mod_sel = 0,
+	.cabc_sel = 0,
+	.cabc = false,
+	.external_pfet = false,
+	.auto_detection_enabled = false,
+};
+
 static const u32 wled3_boost_i_limit_values[] = {
 	105, 385, 525, 805, 980, 1260, 1400, 1680,
 };
@@ -927,6 +1156,16 @@ static const struct wled_var_cfg wled4_boost_i_limit_cfg = {
 	.size = ARRAY_SIZE(wled4_boost_i_limit_values),
 };
 
+static inline u32 wled5_boost_i_limit_values_fn(u32 idx)
+{
+	return 525 + (idx * 175);
+}
+
+static const struct wled_var_cfg wled5_boost_i_limit_cfg = {
+	.fn = wled5_boost_i_limit_values_fn,
+	.size = 8,
+};
+
 static const u32 wled3_ovp_values[] = {
 	35, 32, 29, 27,
 };
@@ -945,6 +1184,21 @@ static const struct wled_var_cfg wled4_ovp_cfg = {
 	.size = ARRAY_SIZE(wled4_ovp_values),
 };
 
+static inline u32 wled5_ovp_values_fn(u32 idx)
+{
+	/*
+	 * 0000 - 38.5 V
+	 * 0001 - 37 V ..
+	 * 1111 - 16 V
+	 */
+	return 38500 - (idx * 1500);
+}
+
+static const struct wled_var_cfg wled5_ovp_cfg = {
+	.fn = wled5_ovp_values_fn,
+	.size = 16,
+};
+
 static u32 wled3_num_strings_values_fn(u32 idx)
 {
 	return idx + 1;
@@ -992,6 +1246,14 @@ static const struct wled_var_cfg wled4_string_cfg = {
 	.size = 16,
 };
 
+static const struct wled_var_cfg wled5_mod_sel_cfg = {
+	.size = 2,
+};
+
+static const struct wled_var_cfg wled5_cabc_sel_cfg = {
+	.size = 4,
+};
+
 static u32 wled_values(const struct wled_var_cfg *cfg, u32 idx)
 {
 	if (idx >= cfg->size)
@@ -1068,6 +1330,44 @@ static int wled_configure(struct wled *wled)
 		},
 	};
 
+	const struct wled_u32_opts wled5_opts[] = {
+		{
+			.name = "qcom,current-boost-limit",
+			.val_ptr = &cfg->boost_i_limit,
+			.cfg = &wled5_boost_i_limit_cfg,
+		},
+		{
+			.name = "qcom,current-limit-microamp",
+			.val_ptr = &cfg->string_i_limit,
+			.cfg = &wled4_string_i_limit_cfg,
+		},
+		{
+			.name = "qcom,ovp-millivolt",
+			.val_ptr = &cfg->ovp,
+			.cfg = &wled5_ovp_cfg,
+		},
+		{
+			.name = "qcom,switching-freq",
+			.val_ptr = &cfg->switch_freq,
+			.cfg = &wled3_switch_freq_cfg,
+		},
+		{
+			.name = "qcom,num-strings",
+			.val_ptr = &cfg->num_strings,
+			.cfg = &wled4_num_strings_cfg,
+		},
+		{
+			.name = "qcom,modulator-sel",
+			.val_ptr = &cfg->mod_sel,
+			.cfg = &wled5_mod_sel_cfg,
+		},
+		{
+			.name = "qcom,cabc-sel",
+			.val_ptr = &cfg->cabc_sel,
+			.cfg = &wled5_cabc_sel_cfg,
+		},
+	};
+
 	const struct wled_bool_opts bool_opts[] = {
 		{ "qcom,cs-out", &cfg->cs_out_en, },
 		{ "qcom,ext-gen", &cfg->ext_gen, },
@@ -1117,6 +1417,23 @@ static int wled_configure(struct wled *wled)
 		wled->sink_addr = be32_to_cpu(*prop_addr);
 		break;
 
+	case 5:
+		u32_opts = wled5_opts;
+		size = ARRAY_SIZE(wled5_opts);
+		*cfg = wled5_config_defaults;
+		wled->wled_set_brightness = wled5_set_brightness;
+		wled->wled_sync_toggle = wled5_sync_toggle;
+		wled->cabc_config = wled5_cabc_config;
+		wled->max_string_count = 4;
+
+		prop_addr = of_get_address(dev->of_node, 1, NULL, NULL);
+		if (!prop_addr) {
+			dev_err(wled->dev, "invalid IO resources\n");
+			return -EINVAL;
+		}
+		wled->sink_addr = be32_to_cpu(*prop_addr);
+		break;
+
 	default:
 		dev_err(wled->dev, "Invalid WLED version\n");
 		return -EINVAL;
@@ -1270,6 +1587,10 @@ static int wled_probe(struct platform_device *pdev)
 	if (rc)
 		return rc;
 
+	val = WLED3_SINK_REG_BRIGHT_MAX;
+	of_property_read_u32(pdev->dev.of_node, "max-brightness", &val);
+	wled->max_brightness = val;
+
 	switch (wled->version) {
 	case 3:
 		wled->cfg.auto_detection_enabled = false;
@@ -1289,6 +1610,18 @@ static int wled_probe(struct platform_device *pdev)
 		}
 		break;
 
+	case 5:
+		wled->has_short_detect = true;
+		if (wled->cfg.cabc_sel)
+			wled->max_brightness = WLED5_SINK_REG_BRIGHT_MAX_12B;
+
+		rc = wled5_setup(wled);
+		if (rc) {
+			dev_err(&pdev->dev, "wled5_setup failed\n");
+			return rc;
+		}
+		break;
+
 	default:
 		dev_err(wled->dev, "Invalid WLED version\n");
 		break;
@@ -1310,7 +1643,7 @@ static int wled_probe(struct platform_device *pdev)
 	memset(&props, 0, sizeof(struct backlight_properties));
 	props.type = BACKLIGHT_RAW;
 	props.brightness = val;
-	props.max_brightness = WLED3_SINK_REG_BRIGHT_MAX;
+	props.max_brightness = wled->max_brightness;
 	bl = devm_backlight_device_register(&pdev->dev, wled->name,
 					    &pdev->dev, wled,
 					    &wled_ops, &props);
@@ -1333,6 +1666,7 @@ static const struct of_device_id wled_match_table[] = {
 	{ .compatible = "qcom,pm8941-wled", .data = (void *)3 },
 	{ .compatible = "qcom,pmi8998-wled", .data = (void *)4 },
 	{ .compatible = "qcom,pm660l-wled", .data = (void *)4 },
+	{ .compatible = "qcom,pm8150l-wled", .data = (void *)5 },
 	{}
 };
 MODULE_DEVICE_TABLE(of, wled_match_table);
-- 
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