[DPU PATCH v2 03/12] drm/msm/dpu: add MDSS top level driver for dpu

[Rajesh Yadav <ryadav-sgV2jX0FEOL9JmXXK+q4OQ@public.gmane.org>]

SoCs containing dpu have a MDSS top level wrapper
which includes sub-blocks as dpu, dsi, phy, dp etc.
MDSS top level wrapper manages common resources like
common clocks, power and irq for its sub-blocks.

Currently, in dpu driver, all the power resource
management is part of power_handle which manages
these resources via a custom implementation. And
the resource relationships are not modelled properly
in dt.  Moreover the irq domain handling code is part
of dpu device (which is a child device) due to lack
of a dedicated driver for MDSS top level wrapper
device.

This change adds dpu_mdss top level driver to handle
common clock like - core clock, ahb clock
(for register access), main power supply (i.e. gdsc)
and irq management.
The top level mdss device/driver acts as an interrupt
controller and manage hwirq mapping for its child
devices.

It implements runtime_pm support for resource management.
Child nodes can control these resources via runtime_pm
get/put calls on their corresponding devices due to parent
child relationship defined in dt.

Changes in v2:
	- merge _dpu_mdss_hw_rev_init to dpu_mdss_init (Sean Paul)
	- merge _dpu_mdss_get_intr_sources to dpu_mdss_irq (Sean Paul)
	- fix indentation for irq_find_mapping call (Sean Paul)
	- remove unnecessary goto statements from dpu_mdss_irq (Sean Paul)
	- remove redundant param checks from
	  dpu_mdss_irq_mask/unmask (Sean Paul/Jordan Crouse)
	- remove redundant param checks from
	  dpu_mdss_irqdomain_map (Sean Paul/Jordan Crouse)
	- return error code from dpu_mdss_enable/disable (Sean Paul/Jordan Crouse)
	- remove redundant param check from dpu_mdss_destroy (Sean Paul)
	- remove explicit calls to devm_kfree (Sean Paul/Jordan Crouse)
	- remove compatibility check from dpu_mdss_init as
	  it is conditionally called from msm_drv (Sean Paul)
	- reworked msm_dss_parse_clock() to add return checks for
	  of_property_read_* calls, fix log message and
	  fix alignment issues (Sean Paul/Jordan Crouse)
	- remove extra line before dpu_mdss_init (Sean Paul)
	- remove redundant param checks from __intr_offset and
	  make it a void function to avoid unnecessary error
	  handling from caller (Jordan Crouse)
	- remove redundant param check from dpu_mdss_irq (Jordan Crouse)
	- change mdss address space log message to debug and use %pK for
	  kernel pointers (Jordan Crouse)
	- remove unnecessary log message from msm_dss_parse_clock (Jordan Crouse)
	- don't export msm_dss_parse_clock since it is used
	  only by dpu driver (Jordan Crouse)

Signed-off-by: Rajesh Yadav <ryadav@codeaurora.org>
---
 drivers/gpu/drm/msm/Makefile                      |   1 +
 drivers/gpu/drm/msm/disp/dpu1/dpu_core_irq.c      |  97 ---------
 drivers/gpu/drm/msm/disp/dpu1/dpu_core_irq.h      |  14 --
 drivers/gpu/drm/msm/disp/dpu1/dpu_hw_catalog.c    |   9 -
 drivers/gpu/drm/msm/disp/dpu1/dpu_hw_catalog.h    |   7 -
 drivers/gpu/drm/msm/disp/dpu1/dpu_hw_interrupts.c |  28 +--
 drivers/gpu/drm/msm/disp/dpu1/dpu_hw_interrupts.h |  11 -
 drivers/gpu/drm/msm/disp/dpu1/dpu_irq.c           |  48 +---
 drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c           |   6 -
 drivers/gpu/drm/msm/disp/dpu1/dpu_kms.h           |   2 -
 drivers/gpu/drm/msm/disp/dpu1/dpu_mdss.c          | 254 ++++++++++++++++++++++
 drivers/gpu/drm/msm/dpu_io_util.c                 |  57 +++++
 drivers/gpu/drm/msm/msm_drv.c                     |  26 ++-
 drivers/gpu/drm/msm/msm_drv.h                     |   2 +-
 drivers/gpu/drm/msm/msm_kms.h                     |   1 +
 include/linux/dpu_io_util.h                       |   2 +
 16 files changed, 339 insertions(+), 226 deletions(-)
 create mode 100644 drivers/gpu/drm/msm/disp/dpu1/dpu_mdss.c

diff --git a/drivers/gpu/drm/msm/Makefile b/drivers/gpu/drm/msm/Makefile
index d7558ed..d9826c1 100644
--- a/drivers/gpu/drm/msm/Makefile
+++ b/drivers/gpu/drm/msm/Makefile
@@ -81,6 +81,7 @@ msm-y := \
 	disp/dpu1/dpu_reg_dma.o \
 	disp/dpu1/dpu_rm.o \
 	disp/dpu1/dpu_vbif.o \
+	disp/dpu1/dpu_mdss.o \
 	dpu_dbg.o \
 	dpu_io_util.o \
 	dpu_dbg_evtlog.o \
diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_core_irq.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_core_irq.c
index fe33013..977adc4 100644
--- a/drivers/gpu/drm/msm/disp/dpu1/dpu_core_irq.c
+++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_core_irq.c
@@ -515,103 +515,6 @@ void dpu_core_irq_uninstall(struct dpu_kms *dpu_kms)
 	dpu_kms->irq_obj.total_irqs = 0;
 }
 
-static void dpu_core_irq_mask(struct irq_data *irqd)
-{
-	struct dpu_kms *dpu_kms;
-
-	if (!irqd || !irq_data_get_irq_chip_data(irqd)) {
-		DPU_ERROR("invalid parameters irqd %d\n", irqd != NULL);
-		return;
-	}
-	dpu_kms = irq_data_get_irq_chip_data(irqd);
-
-	/* memory barrier */
-	smp_mb__before_atomic();
-	clear_bit(irqd->hwirq, &dpu_kms->irq_controller.enabled_mask);
-	/* memory barrier */
-	smp_mb__after_atomic();
-}
-
-static void dpu_core_irq_unmask(struct irq_data *irqd)
-{
-	struct dpu_kms *dpu_kms;
-
-	if (!irqd || !irq_data_get_irq_chip_data(irqd)) {
-		DPU_ERROR("invalid parameters irqd %d\n", irqd != NULL);
-		return;
-	}
-	dpu_kms = irq_data_get_irq_chip_data(irqd);
-
-	/* memory barrier */
-	smp_mb__before_atomic();
-	set_bit(irqd->hwirq, &dpu_kms->irq_controller.enabled_mask);
-	/* memory barrier */
-	smp_mb__after_atomic();
-}
-
-static struct irq_chip dpu_core_irq_chip = {
-	.name = "dpu",
-	.irq_mask = dpu_core_irq_mask,
-	.irq_unmask = dpu_core_irq_unmask,
-};
-
-static int dpu_core_irqdomain_map(struct irq_domain *domain,
-		unsigned int irq, irq_hw_number_t hwirq)
-{
-	struct dpu_kms *dpu_kms;
-	int rc;
-
-	if (!domain || !domain->host_data) {
-		DPU_ERROR("invalid parameters domain %d\n", domain != NULL);
-		return -EINVAL;
-	}
-	dpu_kms = domain->host_data;
-
-	irq_set_chip_and_handler(irq, &dpu_core_irq_chip, handle_level_irq);
-	rc = irq_set_chip_data(irq, dpu_kms);
-
-	return rc;
-}
-
-static const struct irq_domain_ops dpu_core_irqdomain_ops = {
-	.map = dpu_core_irqdomain_map,
-	.xlate = irq_domain_xlate_onecell,
-};
-
-int dpu_core_irq_domain_add(struct dpu_kms *dpu_kms)
-{
-	struct device *dev;
-	struct irq_domain *domain;
-
-	if (!dpu_kms->dev || !dpu_kms->dev->dev) {
-		pr_err("invalid device handles\n");
-		return -EINVAL;
-	}
-
-	dev = dpu_kms->dev->dev;
-
-	domain = irq_domain_add_linear(dev->of_node, 32,
-			&dpu_core_irqdomain_ops, dpu_kms);
-	if (!domain) {
-		pr_err("failed to add irq_domain\n");
-		return -EINVAL;
-	}
-
-	dpu_kms->irq_controller.enabled_mask = 0;
-	dpu_kms->irq_controller.domain = domain;
-
-	return 0;
-}
-
-int dpu_core_irq_domain_fini(struct dpu_kms *dpu_kms)
-{
-	if (dpu_kms->irq_controller.domain) {
-		irq_domain_remove(dpu_kms->irq_controller.domain);
-		dpu_kms->irq_controller.domain = NULL;
-	}
-	return 0;
-}
-
 irqreturn_t dpu_core_irq(struct dpu_kms *dpu_kms)
 {
 	/*
diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_core_irq.h b/drivers/gpu/drm/msm/disp/dpu1/dpu_core_irq.h
index 64a54fe..8fa59db 100644
--- a/drivers/gpu/drm/msm/disp/dpu1/dpu_core_irq.h
+++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_core_irq.h
@@ -38,20 +38,6 @@
 void dpu_core_irq_uninstall(struct dpu_kms *dpu_kms);
 
 /**
- * dpu_core_irq_domain_add - Add core IRQ domain for DPU
- * @dpu_kms:		DPU handle
- * @return:		none
- */
-int dpu_core_irq_domain_add(struct dpu_kms *dpu_kms);
-
-/**
- * dpu_core_irq_domain_fini - uninstall core IRQ domain
- * @dpu_kms:		DPU handle
- * @return:		0 if success; error code otherwise
- */
-int dpu_core_irq_domain_fini(struct dpu_kms *dpu_kms);
-
-/**
  * dpu_core_irq - core IRQ handler
  * @dpu_kms:		DPU handle
  * @return:		interrupt handling status
diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_catalog.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_catalog.c
index 8e779c0..c5b370f 100644
--- a/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_catalog.c
+++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_catalog.c
@@ -77,13 +77,6 @@
 	.has_idle_pc = true,
 };
 
-static struct dpu_mdss_base_cfg sdm845_mdss[] = {
-	{
-	.name = "mdss_0", .id = MDP_TOP,
-	.base = 0x0, .features = 0
-	},
-};
-
 static struct dpu_mdp_cfg sdm845_mdp[] = {
 	{
 	.name = "top_0", .id = MDP_TOP,
@@ -550,8 +543,6 @@ void sdm845_cfg_init(struct dpu_mdss_cfg *dpu_cfg)
 {
 	*dpu_cfg = (struct dpu_mdss_cfg){
 		.caps = &sdm845_dpu_caps,
-		.mdss_count = ARRAY_SIZE(sdm845_mdss),
-		.mdss = sdm845_mdss,
 		.mdp_count = ARRAY_SIZE(sdm845_mdp),
 		.mdp = sdm845_mdp,
 		.ctl_count = ARRAY_SIZE(sdm845_ctl),
diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_catalog.h b/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_catalog.h
index 39bec0a..7084643 100644
--- a/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_catalog.h
+++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_catalog.h
@@ -492,10 +492,6 @@ struct dpu_wb_sub_blocks {
 	u32 maxlinewidth;
 };
 
-struct dpu_mdss_base_cfg {
-	DPU_HW_BLK_INFO;
-};
-
 /**
  * dpu_clk_ctrl_type - Defines top level clock control signals
  */
@@ -875,9 +871,6 @@ struct dpu_mdss_cfg {
 
 	const struct dpu_caps *caps;
 
-	u32 mdss_count;
-	struct dpu_mdss_base_cfg *mdss;
-
 	u32 mdp_count;
 	struct dpu_mdp_cfg *mdp;
 
diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_interrupts.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_interrupts.c
index 9767cc8..73f084c 100644
--- a/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_interrupts.c
+++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_interrupts.c
@@ -22,7 +22,6 @@
  * Register offsets in MDSS register file for the interrupt registers
  * w.r.t. to the MDSS base
  */
-#define HW_INTR_STATUS			0x0010
 #define MDP_SSPP_TOP0_OFF		0x1000
 #define MDP_INTF_0_OFF			0x6B000
 #define MDP_INTF_1_OFF			0x6B800
@@ -1017,17 +1016,6 @@ static int dpu_hw_intr_get_valid_interrupts(struct dpu_hw_intr *intr,
 	return 0;
 }
 
-static int dpu_hw_intr_get_interrupt_sources(struct dpu_hw_intr *intr,
-		uint32_t *sources)
-{
-	if (!intr || !sources)
-		return -EINVAL;
-
-	*sources = DPU_REG_READ(&intr->hw, HW_INTR_STATUS);
-
-	return 0;
-}
-
 static void dpu_hw_intr_get_interrupt_statuses(struct dpu_hw_intr *intr)
 {
 	int i;
@@ -1162,7 +1150,6 @@ static void __setup_intr_ops(struct dpu_hw_intr_ops *ops)
 	ops->clear_all_irqs = dpu_hw_intr_clear_irqs;
 	ops->disable_all_irqs = dpu_hw_intr_disable_irqs;
 	ops->get_valid_interrupts = dpu_hw_intr_get_valid_interrupts;
-	ops->get_interrupt_sources = dpu_hw_intr_get_interrupt_sources;
 	ops->get_interrupt_statuses = dpu_hw_intr_get_interrupt_statuses;
 	ops->clear_interrupt_status = dpu_hw_intr_clear_interrupt_status;
 	ops->clear_intr_status_nolock = dpu_hw_intr_clear_intr_status_nolock;
@@ -1170,23 +1157,18 @@ static void __setup_intr_ops(struct dpu_hw_intr_ops *ops)
 	ops->get_intr_status_nolock = dpu_hw_intr_get_intr_status_nolock;
 }
 
-static struct dpu_mdss_base_cfg *__intr_offset(struct dpu_mdss_cfg *m,
+static void __intr_offset(struct dpu_mdss_cfg *m,
 		void __iomem *addr, struct dpu_hw_blk_reg_map *hw)
 {
-	if (!m || !addr || !hw || m->mdp_count == 0)
-		return NULL;
-
 	hw->base_off = addr;
-	hw->blk_off = m->mdss[0].base;
+	hw->blk_off = m->mdp[0].base;
 	hw->hwversion = m->hwversion;
-	return &m->mdss[0];
 }
 
 struct dpu_hw_intr *dpu_hw_intr_init(void __iomem *addr,
 		struct dpu_mdss_cfg *m)
 {
 	struct dpu_hw_intr *intr;
-	struct dpu_mdss_base_cfg *cfg;
 
 	if (!addr || !m)
 		return ERR_PTR(-EINVAL);
@@ -1195,11 +1177,7 @@ struct dpu_hw_intr *dpu_hw_intr_init(void __iomem *addr,
 	if (!intr)
 		return ERR_PTR(-ENOMEM);
 
-	cfg = __intr_offset(m, addr, &intr->hw);
-	if (!cfg) {
-		kfree(intr);
-		return ERR_PTR(-EINVAL);
-	}
+	__intr_offset(m, addr, &intr->hw);
 	__setup_intr_ops(&intr->ops);
 
 	intr->irq_idx_tbl_size = ARRAY_SIZE(dpu_irq_map);
diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_interrupts.h b/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_interrupts.h
index 2f1a828..b52cdca 100644
--- a/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_interrupts.h
+++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_interrupts.h
@@ -242,17 +242,6 @@ struct dpu_hw_intr_ops {
 	int (*get_valid_interrupts)(
 			struct dpu_hw_intr *intr,
 			uint32_t *mask);
-
-	/**
-	 * get_interrupt_sources - Gets the bitmask of the DPU interrupt
-	 *                         source that are currently fired.
-	 * @intr:	HW interrupt handle
-	 * @sources:	Returning the DPU interrupt source status bit mask
-	 * @return:	0 for success, otherwise failure
-	 */
-	int (*get_interrupt_sources)(
-			struct dpu_hw_intr *intr,
-			uint32_t *sources);
 };
 
 /**
diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_irq.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_irq.c
index 19c0929..d5e6ce0 100644
--- a/drivers/gpu/drm/msm/disp/dpu1/dpu_irq.c
+++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_irq.c
@@ -19,56 +19,11 @@
 #include "dpu_irq.h"
 #include "dpu_core_irq.h"
 
-static uint32_t g_dpu_irq_status;
-
 irqreturn_t dpu_irq(struct msm_kms *kms)
 {
 	struct dpu_kms *dpu_kms = to_dpu_kms(kms);
-	u32 interrupts;
-
-	dpu_kms->hw_intr->ops.get_interrupt_sources(dpu_kms->hw_intr,
-			&interrupts);
-
-	/* store irq status in case of irq-storm debugging */
-	g_dpu_irq_status = interrupts;
-
-	/*
-	 * Taking care of MDP interrupt
-	 */
-	if (interrupts & IRQ_SOURCE_MDP) {
-		interrupts &= ~IRQ_SOURCE_MDP;
-		dpu_core_irq(dpu_kms);
-	}
-
-	/*
-	 * Routing all other interrupts to external drivers
-	 */
-	while (interrupts) {
-		irq_hw_number_t hwirq = fls(interrupts) - 1;
-		unsigned int mapping;
-		int rc;
-
-		mapping = irq_find_mapping(dpu_kms->irq_controller.domain,
-				hwirq);
-		if (mapping == 0) {
-			DPU_EVT32(hwirq, DPU_EVTLOG_ERROR);
-			goto error;
-		}
-
-		rc = generic_handle_irq(mapping);
-		if (rc < 0) {
-			DPU_EVT32(hwirq, mapping, rc, DPU_EVTLOG_ERROR);
-			goto error;
-		}
-
-		interrupts &= ~(1 << hwirq);
-	}
-
-	return IRQ_HANDLED;
 
-error:
-	/* bad situation, inform irq system, it may disable overall MDSS irq */
-	return IRQ_NONE;
+	return dpu_core_irq(dpu_kms);
 }
 
 void dpu_irq_preinstall(struct msm_kms *kms)
@@ -108,5 +63,4 @@ void dpu_irq_uninstall(struct msm_kms *kms)
 	}
 
 	dpu_core_irq_uninstall(dpu_kms);
-	dpu_core_irq_domain_fini(dpu_kms);
 }
diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c
index 06adb38..e4ab753 100644
--- a/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c
+++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c
@@ -636,10 +636,6 @@ static int _dpu_kms_drm_obj_init(struct dpu_kms *dpu_kms)
 	priv = dev->dev_private;
 	catalog = dpu_kms->catalog;
 
-	ret = dpu_core_irq_domain_add(dpu_kms);
-	if (ret)
-		goto fail_irq;
-
 	/*
 	 * Create encoder and query display drivers to create
 	 * bridges and connectors
@@ -716,8 +712,6 @@ static int _dpu_kms_drm_obj_init(struct dpu_kms *dpu_kms)
 	return 0;
 fail:
 	_dpu_kms_drm_obj_destroy(dpu_kms);
-fail_irq:
-	dpu_core_irq_domain_fini(dpu_kms);
 	return ret;
 }
 
diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.h b/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.h
index 5b0c081..a1c0910 100644
--- a/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.h
+++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.h
@@ -184,8 +184,6 @@ struct dpu_kms {
 	struct regulator *mmagic;
 	struct regulator *venus;
 
-	struct dpu_irq_controller irq_controller;
-
 	struct dpu_hw_intr *hw_intr;
 	struct dpu_irq irq_obj;
 
diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_mdss.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_mdss.c
new file mode 100644
index 0000000..ce680ea
--- /dev/null
+++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_mdss.c
@@ -0,0 +1,254 @@
+/*
+ * SPDX-License-Identifier: GPL-2.0
+ * Copyright (c) 2018, The Linux Foundation
+ */
+
+#include "dpu_kms.h"
+
+#define to_dpu_mdss(x) container_of(x, struct dpu_mdss, base)
+
+#define HW_INTR_STATUS			0x0010
+
+struct dpu_mdss {
+	struct msm_mdss base;
+	void __iomem *mmio;
+	unsigned long mmio_len;
+	u32 hwversion;
+	struct dss_module_power mp;
+	struct dpu_irq_controller irq_controller;
+};
+
+static irqreturn_t dpu_mdss_irq(int irq, void *arg)
+{
+	struct dpu_mdss *dpu_mdss = arg;
+	u32 interrupts;
+
+	interrupts = readl_relaxed(dpu_mdss->mmio + HW_INTR_STATUS);
+
+	while (interrupts) {
+		irq_hw_number_t hwirq = fls(interrupts) - 1;
+		unsigned int mapping;
+		int rc;
+
+		mapping = irq_find_mapping(dpu_mdss->irq_controller.domain,
+					   hwirq);
+		if (mapping == 0) {
+			DPU_EVT32(hwirq, DPU_EVTLOG_ERROR);
+			return IRQ_NONE;
+		}
+
+		rc = generic_handle_irq(mapping);
+		if (rc < 0) {
+			DPU_EVT32(hwirq, mapping, rc, DPU_EVTLOG_ERROR);
+			return IRQ_NONE;
+		}
+
+		interrupts &= ~(1 << hwirq);
+	}
+
+	return IRQ_HANDLED;
+}
+
+static void dpu_mdss_irq_mask(struct irq_data *irqd)
+{
+	struct dpu_mdss *dpu_mdss = irq_data_get_irq_chip_data(irqd);
+
+	/* memory barrier */
+	smp_mb__before_atomic();
+	clear_bit(irqd->hwirq, &dpu_mdss->irq_controller.enabled_mask);
+	/* memory barrier */
+	smp_mb__after_atomic();
+}
+
+static void dpu_mdss_irq_unmask(struct irq_data *irqd)
+{
+	struct dpu_mdss *dpu_mdss = irq_data_get_irq_chip_data(irqd);
+
+	/* memory barrier */
+	smp_mb__before_atomic();
+	set_bit(irqd->hwirq, &dpu_mdss->irq_controller.enabled_mask);
+	/* memory barrier */
+	smp_mb__after_atomic();
+}
+
+static struct irq_chip dpu_mdss_irq_chip = {
+	.name = "dpu_mdss",
+	.irq_mask = dpu_mdss_irq_mask,
+	.irq_unmask = dpu_mdss_irq_unmask,
+};
+
+static int dpu_mdss_irqdomain_map(struct irq_domain *domain,
+		unsigned int irq, irq_hw_number_t hwirq)
+{
+	struct dpu_mdss *dpu_mdss = domain->host_data;
+	int ret;
+
+	irq_set_chip_and_handler(irq, &dpu_mdss_irq_chip, handle_level_irq);
+	ret = irq_set_chip_data(irq, dpu_mdss);
+
+	return ret;
+}
+
+static const struct irq_domain_ops dpu_mdss_irqdomain_ops = {
+	.map = dpu_mdss_irqdomain_map,
+	.xlate = irq_domain_xlate_onecell,
+};
+
+static int _dpu_mdss_irq_domain_add(struct dpu_mdss *dpu_mdss)
+{
+	struct device *dev;
+	struct irq_domain *domain;
+
+	dev = dpu_mdss->base.dev->dev;
+
+	domain = irq_domain_add_linear(dev->of_node, 32,
+			&dpu_mdss_irqdomain_ops, dpu_mdss);
+	if (!domain) {
+		DPU_ERROR("failed to add irq_domain\n");
+		return -EINVAL;
+	}
+
+	dpu_mdss->irq_controller.enabled_mask = 0;
+	dpu_mdss->irq_controller.domain = domain;
+
+	return 0;
+}
+
+int _dpu_mdss_irq_domain_fini(struct dpu_mdss *dpu_mdss)
+{
+	if (dpu_mdss->irq_controller.domain) {
+		irq_domain_remove(dpu_mdss->irq_controller.domain);
+		dpu_mdss->irq_controller.domain = NULL;
+	}
+	return 0;
+}
+static int dpu_mdss_enable(struct msm_mdss *mdss)
+{
+	struct dpu_mdss *dpu_mdss = to_dpu_mdss(mdss);
+	struct dss_module_power *mp = &dpu_mdss->mp;
+	int ret;
+
+	ret = msm_dss_enable_clk(mp->clk_config, mp->num_clk, true);
+	if (ret)
+		DPU_ERROR("clock enable failed, ret:%d\n", ret);
+
+	return ret;
+}
+
+static int dpu_mdss_disable(struct msm_mdss *mdss)
+{
+	struct dpu_mdss *dpu_mdss = to_dpu_mdss(mdss);
+	struct dss_module_power *mp = &dpu_mdss->mp;
+	int ret;
+
+	ret = msm_dss_enable_clk(mp->clk_config, mp->num_clk, false);
+	if (ret)
+		DPU_ERROR("clock disable failed, ret:%d\n", ret);
+
+	return ret;
+}
+
+static void dpu_mdss_destroy(struct drm_device *dev)
+{
+	struct platform_device *pdev = to_platform_device(dev->dev);
+	struct msm_drm_private *priv = dev->dev_private;
+	struct dpu_mdss *dpu_mdss = to_dpu_mdss(priv->mdss);
+	struct dss_module_power *mp = &dpu_mdss->mp;
+
+	_dpu_mdss_irq_domain_fini(dpu_mdss);
+
+	msm_dss_put_clk(mp->clk_config, mp->num_clk);
+	devm_kfree(&pdev->dev, mp->clk_config);
+
+	if (dpu_mdss->mmio)
+		msm_iounmap(pdev, dpu_mdss->mmio);
+	dpu_mdss->mmio = NULL;
+
+	pm_runtime_disable(dev->dev);
+	priv->mdss = NULL;
+}
+
+static const struct msm_mdss_funcs mdss_funcs = {
+	.enable	= dpu_mdss_enable,
+	.disable = dpu_mdss_disable,
+	.destroy = dpu_mdss_destroy,
+};
+
+int dpu_mdss_init(struct drm_device *dev)
+{
+	struct platform_device *pdev = to_platform_device(dev->dev);
+	struct msm_drm_private *priv = dev->dev_private;
+	struct dpu_mdss *dpu_mdss;
+	struct dss_module_power *mp;
+	int ret = 0;
+
+	dpu_mdss = devm_kzalloc(dev->dev, sizeof(*dpu_mdss), GFP_KERNEL);
+	if (!dpu_mdss)
+		return -ENOMEM;
+
+	dpu_mdss->mmio = msm_ioremap(pdev, "mdss_phys", "mdss_phys");
+	if (IS_ERR(dpu_mdss->mmio)) {
+		ret = PTR_ERR(dpu_mdss->mmio);
+		DPU_ERROR("mdss register memory map failed: %d\n", ret);
+		dpu_mdss->mmio = NULL;
+		return ret;
+	}
+	DRM_DEBUG("mapped mdss address space @%pK\n", dpu_mdss->mmio);
+	dpu_mdss->mmio_len = msm_iomap_size(pdev, "mdss_phys");
+
+	mp = &dpu_mdss->mp;
+	ret = msm_dss_parse_clock(pdev, mp);
+	if (ret) {
+		DPU_ERROR("failed to parse clocks, ret=%d\n", ret);
+		goto clk_parse_err;
+	}
+
+	ret = msm_dss_get_clk(&pdev->dev, mp->clk_config, mp->num_clk);
+	if (ret) {
+		DPU_ERROR("failed to get clocks, ret=%d\n", ret);
+		goto clk_get_error;
+	}
+
+	ret = msm_dss_clk_set_rate(mp->clk_config, mp->num_clk);
+	if (ret) {
+		DPU_ERROR("failed to set clock rate, ret=%d\n", ret);
+		goto clk_rate_error;
+	}
+
+	dpu_mdss->base.dev = dev;
+	dpu_mdss->base.funcs = &mdss_funcs;
+
+	ret = _dpu_mdss_irq_domain_add(dpu_mdss);
+	if (ret)
+		goto irq_domain_error;
+
+	ret = devm_request_irq(dev->dev, platform_get_irq(pdev, 0),
+			dpu_mdss_irq, 0, "dpu_mdss_isr", dpu_mdss);
+	if (ret) {
+		DPU_ERROR("failed to init irq: %d\n", ret);
+		goto irq_error;
+	}
+
+	pm_runtime_enable(dev->dev);
+
+	pm_runtime_get_sync(dev->dev);
+	dpu_mdss->hwversion = readl_relaxed(dpu_mdss->mmio);
+	pm_runtime_put_sync(dev->dev);
+
+	priv->mdss = &dpu_mdss->base;
+
+	return ret;
+
+irq_error:
+	_dpu_mdss_irq_domain_fini(dpu_mdss);
+irq_domain_error:
+clk_rate_error:
+	msm_dss_put_clk(mp->clk_config, mp->num_clk);
+clk_get_error:
+	devm_kfree(&pdev->dev, mp->clk_config);
+clk_parse_err:
+	if (dpu_mdss->mmio)
+		msm_iounmap(pdev, dpu_mdss->mmio);
+	dpu_mdss->mmio = NULL;
+	return ret;
+}
diff --git a/drivers/gpu/drm/msm/dpu_io_util.c b/drivers/gpu/drm/msm/dpu_io_util.c
index a18bc99..c44f33f 100644
--- a/drivers/gpu/drm/msm/dpu_io_util.c
+++ b/drivers/gpu/drm/msm/dpu_io_util.c
@@ -448,6 +448,63 @@ int msm_dss_enable_clk(struct dss_clk *clk_arry, int num_clk, int enable)
 } /* msm_dss_enable_clk */
 EXPORT_SYMBOL(msm_dss_enable_clk);
 
+int msm_dss_parse_clock(struct platform_device *pdev,
+		struct dss_module_power *mp)
+{
+	u32 i, rc = 0;
+	const char *clock_name;
+	u32 rate = 0, max_rate = 0;
+	int num_clk = 0;
+
+	if (!pdev || !mp)
+		return -EINVAL;
+
+	mp->num_clk = 0;
+	num_clk = of_property_count_strings(pdev->dev.of_node, "clock-names");
+	if (num_clk <= 0) {
+		pr_debug("clocks are not defined\n");
+		return 0;
+	}
+
+	mp->clk_config = devm_kzalloc(&pdev->dev,
+				      sizeof(struct dss_clk) * num_clk,
+				      GFP_KERNEL);
+	if (!mp->clk_config)
+		return -ENOMEM;
+
+	for (i = 0; i < num_clk; i++) {
+		rc = of_property_read_string_index(pdev->dev.of_node,
+						   "clock-names", i,
+						   &clock_name);
+		if (rc)
+			break;
+		strlcpy(mp->clk_config[i].clk_name, clock_name,
+			sizeof(mp->clk_config[i].clk_name));
+
+		rc = of_property_read_u32_index(pdev->dev.of_node,
+						"clock-rate", i,
+						&rate);
+		if (rc)
+			break;
+		mp->clk_config[i].rate = rate;
+		if (!mp->clk_config[i].rate)
+			mp->clk_config[i].type = DSS_CLK_AHB;
+		else
+			mp->clk_config[i].type = DSS_CLK_PCLK;
+
+		rc = of_property_read_u32_index(pdev->dev.of_node,
+						"clock-max-rate", i,
+						&max_rate);
+		if (rc)
+			break;
+		mp->clk_config[i].max_rate = max_rate;
+	}
+
+	if (!rc)
+		mp->num_clk = num_clk;
+
+	return rc;
+}
 
 int dpu_i2c_byte_read(struct i2c_client *client, uint8_t slave_addr,
 			uint8_t reg_offset, uint8_t *read_buf)
diff --git a/drivers/gpu/drm/msm/msm_drv.c b/drivers/gpu/drm/msm/msm_drv.c
index 5d8f1b6..a0e73ea 100644
--- a/drivers/gpu/drm/msm/msm_drv.c
+++ b/drivers/gpu/drm/msm/msm_drv.c
@@ -503,7 +503,18 @@ static int msm_drm_init(struct device *dev, struct drm_driver *drv)
 	ddev->dev_private = priv;
 	priv->dev = ddev;
 
-	ret = mdp5_mdss_init(ddev);
+	switch (get_mdp_ver(pdev)) {
+	case KMS_MDP5:
+		ret = mdp5_mdss_init(ddev);
+		break;
+	case KMS_DPU:
+		ret = dpu_mdss_init(ddev);
+		break;
+	default:
+		ret = 0;
+		break;
+	}
+
 	if (ret)
 		goto mdss_init_fail;
 
@@ -1539,12 +1550,13 @@ static int add_display_components(struct device *dev,
 	int ret;
 
 	/*
-	 * MDP5 based devices don't have a flat hierarchy. There is a top level
-	 * parent: MDSS, and children: MDP5, DSI, HDMI, eDP etc. Populate the
-	 * children devices, find the MDP5 node, and then add the interfaces
-	 * to our components list.
+	 * MDP5/DPU based devices don't have a flat hierarchy. There is a top
+	 * level parent: MDSS, and children: MDP5/DPU, DSI, HDMI, eDP etc.
+	 * Populate the children devices, find the MDP5/DPU node, and then add
+	 * the interfaces to our components list.
 	 */
-	if (of_device_is_compatible(dev->of_node, "qcom,mdss")) {
+	if (of_device_is_compatible(dev->of_node, "qcom,mdss") ||
+		of_device_is_compatible(dev->of_node, "qcom,dpu-mdss")) {
 		ret = of_platform_populate(dev->of_node, NULL, NULL, dev);
 		if (ret) {
 			dev_err(dev, "failed to populate children devices\n");
@@ -1686,7 +1698,7 @@ static int msm_pdev_remove(struct platform_device *pdev)
 	{ .compatible = "qcom,mdp4", .data = (void *)KMS_MDP4 },
 	{ .compatible = "qcom,mdss", .data = (void *)KMS_MDP5 },
 #ifdef CONFIG_DRM_MSM_DPU
-	{ .compatible = "qcom,dpu-kms", .data = (void *)KMS_DPU },
+	{ .compatible = "qcom,dpu-mdss", .data = (void *)KMS_DPU },
 #endif
 	{}
 };
diff --git a/drivers/gpu/drm/msm/msm_drv.h b/drivers/gpu/drm/msm/msm_drv.h
index 90a2521..e8e5e73 100644
--- a/drivers/gpu/drm/msm/msm_drv.h
+++ b/drivers/gpu/drm/msm/msm_drv.h
@@ -381,7 +381,7 @@ struct msm_drm_private {
 	/* subordinate devices, if present: */
 	struct platform_device *gpu_pdev;
 
-	/* top level MDSS wrapper device (for MDP5 only) */
+	/* top level MDSS wrapper device (for MDP5/DPU only) */
 	struct msm_mdss *mdss;
 
 	/* possibly this should be in the kms component, but it is
diff --git a/drivers/gpu/drm/msm/msm_kms.h b/drivers/gpu/drm/msm/msm_kms.h
index 9a7bc7d..5e1de85 100644
--- a/drivers/gpu/drm/msm/msm_kms.h
+++ b/drivers/gpu/drm/msm/msm_kms.h
@@ -144,6 +144,7 @@ struct msm_mdss {
 };
 
 int mdp5_mdss_init(struct drm_device *dev);
+int dpu_mdss_init(struct drm_device *dev);
 
 /**
  * Mode Set Utility Functions
diff --git a/include/linux/dpu_io_util.h b/include/linux/dpu_io_util.h
index 7c73899..45e606f 100644
--- a/include/linux/dpu_io_util.h
+++ b/include/linux/dpu_io_util.h
@@ -104,6 +104,8 @@ int msm_dss_config_vreg(struct device *dev, struct dss_vreg *in_vreg,
 void msm_dss_put_clk(struct dss_clk *clk_arry, int num_clk);
 int msm_dss_clk_set_rate(struct dss_clk *clk_arry, int num_clk);
 int msm_dss_enable_clk(struct dss_clk *clk_arry, int num_clk, int enable);
+int msm_dss_parse_clock(struct platform_device *pdev,
+		struct dss_module_power *mp);
 
 int dpu_i2c_byte_read(struct i2c_client *client, uint8_t slave_addr,
 		       uint8_t reg_offset, uint8_t *read_buf);
-- 
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
a Linux Foundation Collaborative Project

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