tidss_irq.c

  1// SPDX-License-Identifier: GPL-2.0
  2/*
  3 * Copyright (C) 2018 Texas Instruments Incorporated - https://www.ti.com/
  4 * Author: Tomi Valkeinen <tomi.valkeinen@ti.com>
  5 */
  6
  7#include <linux/platform_device.h>
  8
  9#include <drm/drm_drv.h>
 10#include <drm/drm_print.h>
 11
 12#include "tidss_crtc.h"
 13#include "tidss_dispc.h"
 14#include "tidss_drv.h"
 15#include "tidss_irq.h"
 16#include "tidss_plane.h"
 17
 18static void tidss_irq_update(struct tidss_device *tidss)
 19{
 20	assert_spin_locked(&tidss->irq_lock);
 21
 22	dispc_set_irqenable(tidss->dispc, tidss->irq_mask);
 23}
 24
 25void tidss_irq_enable_vblank(struct drm_crtc *crtc)
 26{
 27	struct drm_device *ddev = crtc->dev;
 28	struct tidss_device *tidss = to_tidss(ddev);
 29	struct tidss_crtc *tcrtc = to_tidss_crtc(crtc);
 30	u32 hw_videoport = tcrtc->hw_videoport;
 31	unsigned long flags;
 32
 33	spin_lock_irqsave(&tidss->irq_lock, flags);
 34	tidss->irq_mask |= DSS_IRQ_VP_VSYNC_EVEN(hw_videoport) |
 35			   DSS_IRQ_VP_VSYNC_ODD(hw_videoport);
 36	tidss_irq_update(tidss);
 37	spin_unlock_irqrestore(&tidss->irq_lock, flags);
 38}
 39
 40void tidss_irq_disable_vblank(struct drm_crtc *crtc)
 41{
 42	struct drm_device *ddev = crtc->dev;
 43	struct tidss_device *tidss = to_tidss(ddev);
 44	struct tidss_crtc *tcrtc = to_tidss_crtc(crtc);
 45	u32 hw_videoport = tcrtc->hw_videoport;
 46	unsigned long flags;
 47
 48	spin_lock_irqsave(&tidss->irq_lock, flags);
 49	tidss->irq_mask &= ~(DSS_IRQ_VP_VSYNC_EVEN(hw_videoport) |
 50			     DSS_IRQ_VP_VSYNC_ODD(hw_videoport));
 51	tidss_irq_update(tidss);
 52	spin_unlock_irqrestore(&tidss->irq_lock, flags);
 53}
 54
 55static irqreturn_t tidss_irq_handler(int irq, void *arg)
 56{
 57	struct drm_device *ddev = (struct drm_device *)arg;
 58	struct tidss_device *tidss = to_tidss(ddev);
 59	unsigned int id;
 60	dispc_irq_t irqstatus;
 61
 62	spin_lock(&tidss->irq_lock);
 63	irqstatus = dispc_read_and_clear_irqstatus(tidss->dispc);
 64	spin_unlock(&tidss->irq_lock);
 65
 66	for (id = 0; id < tidss->num_crtcs; id++) {
 67		struct drm_crtc *crtc = tidss->crtcs[id];
 68		struct tidss_crtc *tcrtc = to_tidss_crtc(crtc);
 69		u32 hw_videoport = tcrtc->hw_videoport;
 70
 71		if (irqstatus & (DSS_IRQ_VP_VSYNC_EVEN(hw_videoport) |
 72				 DSS_IRQ_VP_VSYNC_ODD(hw_videoport)))
 73			tidss_crtc_vblank_irq(crtc);
 74
 75		if (irqstatus & (DSS_IRQ_VP_FRAME_DONE(hw_videoport)))
 76			tidss_crtc_framedone_irq(crtc);
 77
 78		if (irqstatus & DSS_IRQ_VP_SYNC_LOST(hw_videoport))
 79			tidss_crtc_error_irq(crtc, irqstatus);
 80	}
 81
 82	for (unsigned int i = 0; i < tidss->num_planes; ++i) {
 83		struct drm_plane *plane = tidss->planes[i];
 84		struct tidss_plane *tplane = to_tidss_plane(plane);
 85
 86		if (irqstatus & DSS_IRQ_PLANE_FIFO_UNDERFLOW(tplane->hw_plane_id))
 87			tidss_plane_error_irq(plane, irqstatus);
 88	}
 89
 90	return IRQ_HANDLED;
 91}
 92
 93void tidss_irq_resume(struct tidss_device *tidss)
 94{
 95	unsigned long flags;
 96
 97	spin_lock_irqsave(&tidss->irq_lock, flags);
 98	tidss_irq_update(tidss);
 99	spin_unlock_irqrestore(&tidss->irq_lock, flags);
100}
101
102int tidss_irq_install(struct drm_device *ddev, unsigned int irq)
103{
104	struct tidss_device *tidss = to_tidss(ddev);
105	int ret;
106
107	if (irq == IRQ_NOTCONNECTED)
108		return -ENOTCONN;
109
110	ret = request_irq(irq, tidss_irq_handler, 0, ddev->driver->name, ddev);
111	if (ret)
112		return ret;
113
114	tidss->irq_mask = 0;
115
116	for (unsigned int i = 0; i < tidss->num_crtcs; ++i) {
117		struct tidss_crtc *tcrtc = to_tidss_crtc(tidss->crtcs[i]);
118
119		tidss->irq_mask |= DSS_IRQ_VP_SYNC_LOST(tcrtc->hw_videoport);
120
121		tidss->irq_mask |= DSS_IRQ_VP_FRAME_DONE(tcrtc->hw_videoport);
122	}
123
124	for (unsigned int i = 0; i < tidss->num_planes; ++i) {
125		struct tidss_plane *tplane = to_tidss_plane(tidss->planes[i]);
126
127		tidss->irq_mask |= DSS_IRQ_PLANE_FIFO_UNDERFLOW(tplane->hw_plane_id);
128	}
129
130	return 0;
131}
132
133void tidss_irq_uninstall(struct drm_device *ddev)
134{
135	struct tidss_device *tidss = to_tidss(ddev);
136
137	free_irq(tidss->irq, ddev);
138}