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Subject[PATCH 3/3] drm/loongson: Add interrupt driver for LS7A
Date
Add LS7A DC vsync interrupt enable and close function, and
register irq_handler function interface.
Add vbrank event processing flow.

Signed-off-by: lichenyang <lichenyang@loongson.cn>
---
drivers/gpu/drm/loongson/Makefile | 3 +-
drivers/gpu/drm/loongson/loongson_crtc.c | 43 +++++++++-
drivers/gpu/drm/loongson/loongson_drv.c | 8 ++
drivers/gpu/drm/loongson/loongson_drv.h | 17 +++-
drivers/gpu/drm/loongson/loongson_irq.c | 105 +++++++++++++++++++++++
5 files changed, 170 insertions(+), 6 deletions(-)
create mode 100644 drivers/gpu/drm/loongson/loongson_irq.c

diff --git a/drivers/gpu/drm/loongson/Makefile b/drivers/gpu/drm/loongson/Makefile
index 773b806e99a2..cc50b65c7e03 100644
--- a/drivers/gpu/drm/loongson/Makefile
+++ b/drivers/gpu/drm/loongson/Makefile
@@ -11,5 +11,6 @@ loongson-y := loongson_drv.o \
loongson_device.o \
loongson_connector.o \
loongson_encoder.o \
- loongson_i2c.o
+ loongson_i2c.o \
+ loongson_irq.o
obj-$(CONFIG_DRM_LOONGSON) += loongson.o
diff --git a/drivers/gpu/drm/loongson/loongson_crtc.c b/drivers/gpu/drm/loongson/loongson_crtc.c
index 4cb65fa08778..4c62d5b2bd56 100644
--- a/drivers/gpu/drm/loongson/loongson_crtc.c
+++ b/drivers/gpu/drm/loongson/loongson_crtc.c
@@ -154,19 +154,25 @@ static void loongson_crtc_mode_set_nofb(struct drm_crtc *crtc)
}

static void loongson_crtc_atomic_enable(struct drm_crtc *crtc,
- struct drm_atomic_state *old_state)
+ struct drm_atomic_state *old_crtc_state)
{
struct drm_device *dev = crtc->dev;
struct loongson_device *ldev = dev->dev_private;
struct loongson_crtc *lcrtc = to_loongson_crtc(crtc);
u32 reg_offset = lcrtc->reg_offset;

+ if (lcrtc->cfg_reg & CFG_ENABLE)
+ goto vblank_on;
+
lcrtc->cfg_reg |= CFG_ENABLE;
ls7a_mm_wreg(ldev, FB_CFG_REG + reg_offset, lcrtc->cfg_reg);
+
+vblank_on:
+ drm_crtc_vblank_on(crtc);
}

static void loongson_crtc_atomic_disable(struct drm_crtc *crtc,
- struct drm_atomic_state *old_state)
+ struct drm_atomic_state *old_crtc_state)
{
struct drm_device *dev = crtc->dev;
struct loongson_device *ldev = dev->dev_private;
@@ -175,10 +181,36 @@ static void loongson_crtc_atomic_disable(struct drm_crtc *crtc,

lcrtc->cfg_reg &= ~CFG_ENABLE;
ls7a_mm_wreg(ldev, FB_CFG_REG + reg_offset, lcrtc->cfg_reg);
+
+ spin_lock_irq(&crtc->dev->event_lock);
+ if (crtc->state->event) {
+ drm_crtc_send_vblank_event(crtc, crtc->state->event);
+ crtc->state->event = NULL;
+ }
+ spin_unlock_irq(&crtc->dev->event_lock);
+
+ drm_crtc_vblank_off(crtc);
+}
+
+static void loongson_crtc_atomic_flush(struct drm_crtc *crtc,
+ struct drm_crtc_state *old_crtc_state)
+{
+ struct drm_pending_vblank_event *event = crtc->state->event;
+
+ if (event) {
+ crtc->state->event = NULL;
+
+ spin_lock_irq(&crtc->dev->event_lock);
+ if (drm_crtc_vblank_get(crtc) == 0)
+ drm_crtc_arm_vblank_event(crtc, event);
+ else
+ drm_crtc_send_vblank_event(crtc, event);
+ spin_unlock_irq(&crtc->dev->event_lock);
+ }
}

static enum drm_mode_status loongson_mode_valid(struct drm_crtc *crtc,
- const struct drm_display_mode *mode)
+ const struct drm_display_mode *mode)
{
if (mode->hdisplay > 1920)
return MODE_BAD;
@@ -194,9 +226,10 @@ static enum drm_mode_status loongson_mode_valid(struct drm_crtc *crtc,

static const struct drm_crtc_helper_funcs loongson_crtc_helper_funcs = {
.mode_valid = loongson_mode_valid,
+ .mode_set_nofb = loongson_crtc_mode_set_nofb,
+ .atomic_flush = loongson_crtc_atomic_flush,
.atomic_enable = loongson_crtc_atomic_enable,
.atomic_disable = loongson_crtc_atomic_disable,
- .mode_set_nofb = loongson_crtc_mode_set_nofb,
};

static const struct drm_crtc_funcs loongson_crtc_funcs = {
@@ -206,6 +239,8 @@ static const struct drm_crtc_funcs loongson_crtc_funcs = {
.destroy = drm_crtc_cleanup,
.atomic_duplicate_state = drm_atomic_helper_crtc_duplicate_state,
.atomic_destroy_state = drm_atomic_helper_crtc_destroy_state,
+ .enable_vblank = loongson_crtc_enable_vblank,
+ .disable_vblank = loongson_crtc_disable_vblank,
};

int loongson_crtc_init(struct loongson_device *ldev, int index)
diff --git a/drivers/gpu/drm/loongson/loongson_drv.c b/drivers/gpu/drm/loongson/loongson_drv.c
index 252be9e25aff..89450c8c9102 100644
--- a/drivers/gpu/drm/loongson/loongson_drv.c
+++ b/drivers/gpu/drm/loongson/loongson_drv.c
@@ -167,6 +167,10 @@ static int loongson_drm_load(struct drm_device *dev, unsigned long flags)
if (ret)
dev_err(dev->dev, "Fatal error during modeset init: %d\n", ret);

+ ret = loongson_irq_init(ldev);
+ if (ret)
+ dev_err(dev->dev, "Fatal error during irq init: %d\n", ret);
+
drm_kms_helper_poll_init(dev);
drm_mode_config_reset(dev);

@@ -192,6 +196,10 @@ static struct drm_driver loongson_drm_driver = {
.fops = &fops,
DRM_GEM_VRAM_DRIVER,

+ .irq_handler = loongson_irq_handler,
+ .irq_preinstall = loongson_irq_preinstall,
+ .irq_uninstall = loongson_irq_uninstall,
+
.name = DRIVER_NAME,
.desc = DRIVER_DESC,
.date = DRIVER_DATE,
diff --git a/drivers/gpu/drm/loongson/loongson_drv.h b/drivers/gpu/drm/loongson/loongson_drv.h
index 24a534c3c79c..60f5bd48f7f2 100644
--- a/drivers/gpu/drm/loongson/loongson_drv.h
+++ b/drivers/gpu/drm/loongson/loongson_drv.h
@@ -4,9 +4,11 @@
#define __LOONGSON_DRV_H__

#include <drm/drm_drv.h>
+#include <drm/drm_fourcc.h>
+#include <drm/drm_vblank.h>
#include <drm/drm_gem.h>
+#include <drm/drm_irq.h>
#include <drm/drm_fb_helper.h>
-#include <drm/drm_fourcc.h>
#include <drm/drm_probe_helper.h>
#include <drm/drm_atomic.h>
#include <drm/drm_atomic_helper.h>
@@ -49,6 +51,7 @@
#define FB_HSYNC_REG (0x1420)
#define FB_VDISPLAY_REG (0x1480)
#define FB_VSYNC_REG (0x14a0)
+#define FB_INT_REG (0x1570)

#define CFG_FMT GENMASK(2, 0)
#define CFG_FBSWITCH BIT(7)
@@ -60,6 +63,10 @@
#define FB_PANCFG_DEF 0x80001311
#define FB_HSYNC_PULSE (1 << 30)
#define FB_VSYNC_PULSE (1 << 30)
+#define FB_VSYNC1_ENABLE (1 << 16)
+#define FB_VSYNC0_ENABLE (1 << 18)
+#define FB_VSYNC1_INT (1 << 0)
+#define FB_VSYNC0_INT (1 << 2)

/* PIX PLL */
#define LOOPC_MIN 24
@@ -136,6 +143,14 @@ int loongson_encoder_init(struct loongson_device *ldev, int index);
/* plane */
int loongson_plane_init(struct loongson_crtc *lcrtc);

+/* irq */
+int loongson_irq_init(struct loongson_device *ldev);
+int loongson_crtc_enable_vblank(struct drm_crtc *crtc);
+void loongson_crtc_disable_vblank(struct drm_crtc *crtc);
+irqreturn_t loongson_irq_handler(int irq, void *arg);
+void loongson_irq_preinstall(struct drm_device *dev);
+void loongson_irq_uninstall(struct drm_device *dev);
+
/* i2c */
int loongson_dc_gpio_init(struct loongson_device *ldev);

diff --git a/drivers/gpu/drm/loongson/loongson_irq.c b/drivers/gpu/drm/loongson/loongson_irq.c
new file mode 100644
index 000000000000..d212e16f3c00
--- /dev/null
+++ b/drivers/gpu/drm/loongson/loongson_irq.c
@@ -0,0 +1,105 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#include "loongson_drv.h"
+#include <linux/pci.h>
+
+int loongson_irq_init(struct loongson_device *ldev)
+{
+ struct drm_device *dev;
+ int ret, irq;
+
+ dev = ldev->dev;
+ irq = dev->pdev->irq;
+
+ ret = drm_vblank_init(dev, ldev->num_crtc);
+ if (ret) {
+ dev_err(dev->dev, "Fatal error during vblank init: %d\n", ret);
+ return ret;
+ }
+ DRM_INFO("drm vblank init finished\n");
+
+ ret = drm_irq_install(dev, irq);
+ if (ret) {
+ dev_err(dev->dev, "Fatal error during irq install: %d\n", ret);
+ return ret;
+ }
+ DRM_INFO("loongson irq initialized\n");
+
+ return 0;
+}
+
+int loongson_crtc_enable_vblank(struct drm_crtc *crtc)
+{
+ struct loongson_crtc *lcrtc = to_loongson_crtc(crtc);
+ struct loongson_device *ldev = lcrtc->ldev;
+ u32 reg_val;
+
+ if (lcrtc->crtc_id) {
+ reg_val = ls7a_mm_rreg(ldev, FB_INT_REG);
+ reg_val |= FB_VSYNC1_ENABLE;
+ ls7a_mm_wreg(ldev, FB_INT_REG, reg_val);
+ } else {
+ reg_val = ls7a_mm_rreg(ldev, FB_INT_REG);
+ reg_val |= FB_VSYNC0_ENABLE;
+ ls7a_mm_wreg(ldev, FB_INT_REG, reg_val);
+ }
+
+ return 0;
+}
+
+void loongson_crtc_disable_vblank(struct drm_crtc *crtc)
+{
+ struct loongson_crtc *lcrtc = to_loongson_crtc(crtc);
+ struct loongson_device *ldev = lcrtc->ldev;
+ u32 reg_val;
+
+ if (lcrtc->crtc_id) {
+ reg_val = ls7a_mm_rreg(ldev, FB_INT_REG);
+ reg_val &= ~FB_VSYNC1_ENABLE;
+ ls7a_mm_wreg(ldev, FB_INT_REG, reg_val);
+ } else {
+ reg_val = ls7a_mm_rreg(ldev, FB_INT_REG);
+ reg_val &= ~FB_VSYNC0_ENABLE;
+ ls7a_mm_wreg(ldev, FB_INT_REG, reg_val);
+ }
+}
+
+irqreturn_t loongson_irq_handler(int irq, void *arg)
+{
+ struct drm_device *dev = (struct drm_device *) arg;
+ struct loongson_device *ldev = dev->dev_private;
+ struct loongson_crtc *lcrtc;
+ u32 val;
+
+ val = ls7a_mm_rreg(ldev, FB_INT_REG);
+ ls7a_mm_wreg(ldev, FB_INT_REG, val & (0xffff << 16));
+
+ if (val & FB_VSYNC0_INT) {
+ lcrtc = ldev->mode_info[0].crtc;
+ drm_crtc_handle_vblank(&lcrtc->base);
+ }
+
+ if (val & FB_VSYNC1_INT) {
+ lcrtc = ldev->mode_info[1].crtc;
+ drm_crtc_handle_vblank(&lcrtc->base);
+ }
+
+ return IRQ_HANDLED;
+}
+
+void loongson_irq_preinstall(struct drm_device *dev)
+{
+ struct loongson_device *ldev = dev->dev_private;
+
+ ls7a_mm_wreg(ldev, FB_INT_REG, 0x0000 << 16);
+}
+
+void loongson_irq_uninstall(struct drm_device *dev)
+{
+ struct loongson_device *ldev = dev->dev_private;
+
+ if (ldev == NULL)
+ return;
+
+ ls7a_mm_wreg(ldev, FB_INT_REG, 0x0000 << 16);
+}
--
2.31.1
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