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linux/drivers/gpu/drm/rcar-du/rcar_du_crtc.c

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/*
* rcar_du_crtc.c -- R-Car Display Unit CRTCs
*
* Copyright (C) 2013-2015 Renesas Electronics Corporation
*
* Contact: Laurent Pinchart (laurent.pinchart@ideasonboard.com)
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*/
#include <linux/clk.h>
#include <linux/mutex.h>
#include <linux/sys_soc.h>
#include <drm/drmP.h>
#include <drm/drm_atomic.h>
#include <drm/drm_atomic_helper.h>
#include <drm/drm_crtc.h>
#include <drm/drm_crtc_helper.h>
#include <drm/drm_fb_cma_helper.h>
#include <drm/drm_gem_cma_helper.h>
#include <drm/drm_plane_helper.h>
#include "rcar_du_crtc.h"
#include "rcar_du_drv.h"
#include "rcar_du_kms.h"
#include "rcar_du_plane.h"
#include "rcar_du_regs.h"
#include "rcar_du_vsp.h"
static u32 rcar_du_crtc_read(struct rcar_du_crtc *rcrtc, u32 reg)
{
struct rcar_du_device *rcdu = rcrtc->group->dev;
return rcar_du_read(rcdu, rcrtc->mmio_offset + reg);
}
static void rcar_du_crtc_write(struct rcar_du_crtc *rcrtc, u32 reg, u32 data)
{
struct rcar_du_device *rcdu = rcrtc->group->dev;
rcar_du_write(rcdu, rcrtc->mmio_offset + reg, data);
}
static void rcar_du_crtc_clr(struct rcar_du_crtc *rcrtc, u32 reg, u32 clr)
{
struct rcar_du_device *rcdu = rcrtc->group->dev;
rcar_du_write(rcdu, rcrtc->mmio_offset + reg,
rcar_du_read(rcdu, rcrtc->mmio_offset + reg) & ~clr);
}
static void rcar_du_crtc_set(struct rcar_du_crtc *rcrtc, u32 reg, u32 set)
{
struct rcar_du_device *rcdu = rcrtc->group->dev;
rcar_du_write(rcdu, rcrtc->mmio_offset + reg,
rcar_du_read(rcdu, rcrtc->mmio_offset + reg) | set);
}
static void rcar_du_crtc_clr_set(struct rcar_du_crtc *rcrtc, u32 reg,
u32 clr, u32 set)
{
struct rcar_du_device *rcdu = rcrtc->group->dev;
u32 value = rcar_du_read(rcdu, rcrtc->mmio_offset + reg);
rcar_du_write(rcdu, rcrtc->mmio_offset + reg, (value & ~clr) | set);
}
static int rcar_du_crtc_get(struct rcar_du_crtc *rcrtc)
{
int ret;
ret = clk_prepare_enable(rcrtc->clock);
if (ret < 0)
return ret;
ret = clk_prepare_enable(rcrtc->extclock);
if (ret < 0)
goto error_clock;
ret = rcar_du_group_get(rcrtc->group);
if (ret < 0)
goto error_group;
return 0;
error_group:
clk_disable_unprepare(rcrtc->extclock);
error_clock:
clk_disable_unprepare(rcrtc->clock);
return ret;
}
static void rcar_du_crtc_put(struct rcar_du_crtc *rcrtc)
{
rcar_du_group_put(rcrtc->group);
clk_disable_unprepare(rcrtc->extclock);
clk_disable_unprepare(rcrtc->clock);
}
/* -----------------------------------------------------------------------------
* Hardware Setup
*/
struct dpll_info {
unsigned int output;
unsigned int fdpll;
unsigned int n;
unsigned int m;
};
static void rcar_du_dpll_divider(struct rcar_du_crtc *rcrtc,
struct dpll_info *dpll,
unsigned long input,
unsigned long target)
{
unsigned long best_diff = (unsigned long)-1;
unsigned long diff;
unsigned int fdpll;
unsigned int m;
unsigned int n;
/*
* fin fvco fout fclkout
* in --> [1/M] --> |PD| -> [LPF] -> [VCO] -> [1/P] -+-> [1/FDPLL] -> out
* +-> | | |
* | |
* +---------------- [1/N] <------------+
*
* fclkout = fvco / P / FDPLL -- (1)
*
* fin/M = fvco/P/N
*
* fvco = fin * P * N / M -- (2)
*
* (1) + (2) indicates
*
* fclkout = fin * N / M / FDPLL
*
* NOTES
* N : (n + 1)
* M : (m + 1)
* FDPLL : (fdpll + 1)
* P : 2
* 2kHz < fvco < 4096MHz
*
* To minimize the jitter,
* N : as large as possible
* M : as small as possible
*/
for (m = 0; m < 4; m++) {
for (n = 119; n > 38; n--) {
/*
* This code only runs on 64-bit architectures, the
* unsigned long type can thus be used for 64-bit
* computation. It will still compile without any
* warning on 32-bit architectures.
*
* To optimize calculations, use fout instead of fvco
* to verify the VCO frequency constraint.
*/
unsigned long fout = input * (n + 1) / (m + 1);
if (fout < 1000 || fout > 2048 * 1000 * 1000U)
continue;
for (fdpll = 1; fdpll < 32; fdpll++) {
unsigned long output;
output = fout / (fdpll + 1);
if (output >= 400 * 1000 * 1000)
continue;
diff = abs((long)output - (long)target);
if (best_diff > diff) {
best_diff = diff;
dpll->n = n;
dpll->m = m;
dpll->fdpll = fdpll;
dpll->output = output;
}
if (diff == 0)
goto done;
}
}
}
done:
dev_dbg(rcrtc->group->dev->dev,
"output:%u, fdpll:%u, n:%u, m:%u, diff:%lu\n",
dpll->output, dpll->fdpll, dpll->n, dpll->m,
best_diff);
}
static const struct soc_device_attribute rcar_du_r8a7795_es1[] = {
{ .soc_id = "r8a7795", .revision = "ES1.*" },
{ /* sentinel */ }
};
static void rcar_du_crtc_set_display_timing(struct rcar_du_crtc *rcrtc)
{
const struct drm_display_mode *mode = &rcrtc->crtc.state->adjusted_mode;
struct rcar_du_device *rcdu = rcrtc->group->dev;
unsigned long mode_clock = mode->clock * 1000;
unsigned long clk;
u32 value;
u32 escr;
u32 div;
/*
* Compute the clock divisor and select the internal or external dot
* clock based on the requested frequency.
*/
clk = clk_get_rate(rcrtc->clock);
div = DIV_ROUND_CLOSEST(clk, mode_clock);
div = clamp(div, 1U, 64U) - 1;
escr = div | ESCR_DCLKSEL_CLKS;
if (rcrtc->extclock) {
struct dpll_info dpll = { 0 };
unsigned long extclk;
unsigned long extrate;
unsigned long rate;
u32 extdiv;
extclk = clk_get_rate(rcrtc->extclock);
if (rcdu->info->dpll_ch & (1 << rcrtc->index)) {
unsigned long target = mode_clock;
/*
* The H3 ES1.x exhibits dot clock duty cycle stability
* issues. We can work around them by configuring the
* DPLL to twice the desired frequency, coupled with a
* /2 post-divider. This isn't needed on other SoCs and
* breaks HDMI output on M3-W for a currently unknown
* reason, so restrict the workaround to H3 ES1.x.
*/
if (soc_device_match(rcar_du_r8a7795_es1))
target *= 2;
rcar_du_dpll_divider(rcrtc, &dpll, extclk, target);
extclk = dpll.output;
}
extdiv = DIV_ROUND_CLOSEST(extclk, mode_clock);
extdiv = clamp(extdiv, 1U, 64U) - 1;
rate = clk / (div + 1);
extrate = extclk / (extdiv + 1);
if (abs((long)extrate - (long)mode_clock) <
abs((long)rate - (long)mode_clock)) {
if (rcdu->info->dpll_ch & (1 << rcrtc->index)) {
u32 dpllcr = DPLLCR_CODE | DPLLCR_CLKE
| DPLLCR_FDPLL(dpll.fdpll)
| DPLLCR_N(dpll.n) | DPLLCR_M(dpll.m)
| DPLLCR_STBY;
if (rcrtc->index == 1)
dpllcr |= DPLLCR_PLCS1
| DPLLCR_INCS_DOTCLKIN1;
else
dpllcr |= DPLLCR_PLCS0
| DPLLCR_INCS_DOTCLKIN0;
rcar_du_group_write(rcrtc->group, DPLLCR,
dpllcr);
}
escr = ESCR_DCLKSEL_DCLKIN | extdiv;
}
dev_dbg(rcrtc->group->dev->dev,
"mode clock %lu extrate %lu rate %lu ESCR 0x%08x\n",
mode_clock, extrate, rate, escr);
}
rcar_du_group_write(rcrtc->group, rcrtc->index % 2 ? ESCR2 : ESCR,
escr);
rcar_du_group_write(rcrtc->group, rcrtc->index % 2 ? OTAR2 : OTAR, 0);
/* Signal polarities */
value = ((mode->flags & DRM_MODE_FLAG_PVSYNC) ? DSMR_VSL : 0)
| ((mode->flags & DRM_MODE_FLAG_PHSYNC) ? DSMR_HSL : 0)
| DSMR_DIPM_DISP | DSMR_CSPM;
rcar_du_crtc_write(rcrtc, DSMR, value);
/* Display timings */
rcar_du_crtc_write(rcrtc, HDSR, mode->htotal - mode->hsync_start - 19);
rcar_du_crtc_write(rcrtc, HDER, mode->htotal - mode->hsync_start +
mode->hdisplay - 19);
rcar_du_crtc_write(rcrtc, HSWR, mode->hsync_end -
mode->hsync_start - 1);
rcar_du_crtc_write(rcrtc, HCR, mode->htotal - 1);
rcar_du_crtc_write(rcrtc, VDSR, mode->crtc_vtotal -
mode->crtc_vsync_end - 2);
rcar_du_crtc_write(rcrtc, VDER, mode->crtc_vtotal -
mode->crtc_vsync_end +
mode->crtc_vdisplay - 2);
rcar_du_crtc_write(rcrtc, VSPR, mode->crtc_vtotal -
mode->crtc_vsync_end +
mode->crtc_vsync_start - 1);
rcar_du_crtc_write(rcrtc, VCR, mode->crtc_vtotal - 1);
rcar_du_crtc_write(rcrtc, DESR, mode->htotal - mode->hsync_start - 1);
rcar_du_crtc_write(rcrtc, DEWR, mode->hdisplay);
}
void rcar_du_crtc_route_output(struct drm_crtc *crtc,
enum rcar_du_output output)
{
struct rcar_du_crtc *rcrtc = to_rcar_crtc(crtc);
struct rcar_du_device *rcdu = rcrtc->group->dev;
/*
* Store the route from the CRTC output to the DU output. The DU will be
* configured when starting the CRTC.
*/
rcrtc->outputs |= BIT(output);
/*
* Store RGB routing to DPAD0, the hardware will be configured when
* starting the CRTC.
*/
if (output == RCAR_DU_OUTPUT_DPAD0)
rcdu->dpad0_source = rcrtc->index;
}
static unsigned int plane_zpos(struct rcar_du_plane *plane)
{
return plane->plane.state->normalized_zpos;
}
static const struct rcar_du_format_info *
plane_format(struct rcar_du_plane *plane)
{
return to_rcar_plane_state(plane->plane.state)->format;
}
static void rcar_du_crtc_update_planes(struct rcar_du_crtc *rcrtc)
{
struct rcar_du_plane *planes[RCAR_DU_NUM_HW_PLANES];
struct rcar_du_device *rcdu = rcrtc->group->dev;
unsigned int num_planes = 0;
unsigned int dptsr_planes;
unsigned int hwplanes = 0;
unsigned int prio = 0;
unsigned int i;
u32 dspr = 0;
for (i = 0; i < rcrtc->group->num_planes; ++i) {
struct rcar_du_plane *plane = &rcrtc->group->planes[i];
unsigned int j;
if (plane->plane.state->crtc != &rcrtc->crtc ||
!plane->plane.state->visible)
continue;
/* Insert the plane in the sorted planes array. */
for (j = num_planes++; j > 0; --j) {
if (plane_zpos(planes[j-1]) <= plane_zpos(plane))
break;
planes[j] = planes[j-1];
}
planes[j] = plane;
prio += plane_format(plane)->planes * 4;
}
for (i = 0; i < num_planes; ++i) {
struct rcar_du_plane *plane = planes[i];
struct drm_plane_state *state = plane->plane.state;
unsigned int index = to_rcar_plane_state(state)->hwindex;
prio -= 4;
dspr |= (index + 1) << prio;
hwplanes |= 1 << index;
if (plane_format(plane)->planes == 2) {
index = (index + 1) % 8;
prio -= 4;
dspr |= (index + 1) << prio;
hwplanes |= 1 << index;
}
}
/* If VSP+DU integration is enabled the plane assignment is fixed. */
if (rcar_du_has(rcdu, RCAR_DU_FEATURE_VSP1_SOURCE)) {
if (rcdu->info->gen < 3) {
dspr = (rcrtc->index % 2) + 1;
hwplanes = 1 << (rcrtc->index % 2);
} else {
dspr = (rcrtc->index % 2) ? 3 : 1;
hwplanes = 1 << ((rcrtc->index % 2) ? 2 : 0);
}
}
/*
* Update the planes to display timing and dot clock generator
* associations.
*
* Updating the DPTSR register requires restarting the CRTC group,
* resulting in visible flicker. To mitigate the issue only update the
* association if needed by enabled planes. Planes being disabled will
* keep their current association.
*/
mutex_lock(&rcrtc->group->lock);
dptsr_planes = rcrtc->index % 2 ? rcrtc->group->dptsr_planes | hwplanes
: rcrtc->group->dptsr_planes & ~hwplanes;
if (dptsr_planes != rcrtc->group->dptsr_planes) {
rcar_du_group_write(rcrtc->group, DPTSR,
(dptsr_planes << 16) | dptsr_planes);
rcrtc->group->dptsr_planes = dptsr_planes;
if (rcrtc->group->used_crtcs)
rcar_du_group_restart(rcrtc->group);
}
/* Restart the group if plane sources have changed. */
if (rcrtc->group->need_restart)
rcar_du_group_restart(rcrtc->group);
mutex_unlock(&rcrtc->group->lock);
rcar_du_group_write(rcrtc->group, rcrtc->index % 2 ? DS2PR : DS1PR,
dspr);
}
/* -----------------------------------------------------------------------------
* Page Flip
*/
void rcar_du_crtc_finish_page_flip(struct rcar_du_crtc *rcrtc)
{
struct drm_pending_vblank_event *event;
struct drm_device *dev = rcrtc->crtc.dev;
unsigned long flags;
spin_lock_irqsave(&dev->event_lock, flags);
event = rcrtc->event;
rcrtc->event = NULL;
spin_unlock_irqrestore(&dev->event_lock, flags);
if (event == NULL)
return;
spin_lock_irqsave(&dev->event_lock, flags);
drm_crtc_send_vblank_event(&rcrtc->crtc, event);
wake_up(&rcrtc->flip_wait);
spin_unlock_irqrestore(&dev->event_lock, flags);
drm_crtc_vblank_put(&rcrtc->crtc);
}
static bool rcar_du_crtc_page_flip_pending(struct rcar_du_crtc *rcrtc)
{
struct drm_device *dev = rcrtc->crtc.dev;
unsigned long flags;
bool pending;
spin_lock_irqsave(&dev->event_lock, flags);
pending = rcrtc->event != NULL;
spin_unlock_irqrestore(&dev->event_lock, flags);
return pending;
}
static void rcar_du_crtc_wait_page_flip(struct rcar_du_crtc *rcrtc)
{
struct rcar_du_device *rcdu = rcrtc->group->dev;
if (wait_event_timeout(rcrtc->flip_wait,
!rcar_du_crtc_page_flip_pending(rcrtc),
msecs_to_jiffies(50)))
return;
dev_warn(rcdu->dev, "page flip timeout\n");
rcar_du_crtc_finish_page_flip(rcrtc);
}
/* -----------------------------------------------------------------------------
* Start/Stop and Suspend/Resume
*/
static void rcar_du_crtc_setup(struct rcar_du_crtc *rcrtc)
{
/* Set display off and background to black */
rcar_du_crtc_write(rcrtc, DOOR, DOOR_RGB(0, 0, 0));
rcar_du_crtc_write(rcrtc, BPOR, BPOR_RGB(0, 0, 0));
/* Configure display timings and output routing */
rcar_du_crtc_set_display_timing(rcrtc);
rcar_du_group_set_routing(rcrtc->group);
/* Start with all planes disabled. */
rcar_du_group_write(rcrtc->group, rcrtc->index % 2 ? DS2PR : DS1PR, 0);
/* Enable the VSP compositor. */
if (rcar_du_has(rcrtc->group->dev, RCAR_DU_FEATURE_VSP1_SOURCE))
rcar_du_vsp_enable(rcrtc);
/* Turn vertical blanking interrupt reporting on. */
drm_crtc_vblank_on(&rcrtc->crtc);
}
static void rcar_du_crtc_start(struct rcar_du_crtc *rcrtc)
{
bool interlaced;
/*
* Select master sync mode. This enables display operation in master
* sync mode (with the HSYNC and VSYNC signals configured as outputs and
* actively driven).
*/
interlaced = rcrtc->crtc.mode.flags & DRM_MODE_FLAG_INTERLACE;
rcar_du_crtc_clr_set(rcrtc, DSYSR, DSYSR_TVM_MASK | DSYSR_SCM_MASK,
(interlaced ? DSYSR_SCM_INT_VIDEO : 0) |
DSYSR_TVM_MASTER);
rcar_du_group_start_stop(rcrtc->group, true);
}
static void rcar_du_crtc_disable_planes(struct rcar_du_crtc *rcrtc)
{
struct rcar_du_device *rcdu = rcrtc->group->dev;
struct drm_crtc *crtc = &rcrtc->crtc;
u32 status;
/* Make sure vblank interrupts are enabled. */
drm_crtc_vblank_get(crtc);
/*
* Disable planes and calculate how many vertical blanking interrupts we
* have to wait for. If a vertical blanking interrupt has been triggered
* but not processed yet, we don't know whether it occurred before or
* after the planes got disabled. We thus have to wait for two vblank
* interrupts in that case.
*/
spin_lock_irq(&rcrtc->vblank_lock);
rcar_du_group_write(rcrtc->group, rcrtc->index % 2 ? DS2PR : DS1PR, 0);
status = rcar_du_crtc_read(rcrtc, DSSR);
rcrtc->vblank_count = status & DSSR_VBK ? 2 : 1;
spin_unlock_irq(&rcrtc->vblank_lock);
if (!wait_event_timeout(rcrtc->vblank_wait, rcrtc->vblank_count == 0,
msecs_to_jiffies(100)))
dev_warn(rcdu->dev, "vertical blanking timeout\n");
drm_crtc_vblank_put(crtc);
}
static void rcar_du_crtc_stop(struct rcar_du_crtc *rcrtc)
{
struct drm_crtc *crtc = &rcrtc->crtc;
/*
* Disable all planes and wait for the change to take effect. This is
* required as the plane enable registers are updated on vblank, and no
* vblank will occur once the CRTC is stopped. Disabling planes when
* starting the CRTC thus wouldn't be enough as it would start scanning
* out immediately from old frame buffers until the next vblank.
*
* This increases the CRTC stop delay, especially when multiple CRTCs
* are stopped in one operation as we now wait for one vblank per CRTC.
* Whether this can be improved needs to be researched.
*/
rcar_du_crtc_disable_planes(rcrtc);
/*
* Disable vertical blanking interrupt reporting. We first need to wait
* for page flip completion before stopping the CRTC as userspace
* expects page flips to eventually complete.
*/
rcar_du_crtc_wait_page_flip(rcrtc);
drm_crtc_vblank_off(crtc);
/* Disable the VSP compositor. */
if (rcar_du_has(rcrtc->group->dev, RCAR_DU_FEATURE_VSP1_SOURCE))
rcar_du_vsp_disable(rcrtc);
/*
* Select switch sync mode. This stops display operation and configures
* the HSYNC and VSYNC signals as inputs.
*/
rcar_du_crtc_clr_set(rcrtc, DSYSR, DSYSR_TVM_MASK, DSYSR_TVM_SWITCH);
rcar_du_group_start_stop(rcrtc->group, false);
}
/* -----------------------------------------------------------------------------
* CRTC Functions
*/
static void rcar_du_crtc_atomic_enable(struct drm_crtc *crtc,
struct drm_crtc_state *old_state)
{
struct rcar_du_crtc *rcrtc = to_rcar_crtc(crtc);
/*
* If the CRTC has already been setup by the .atomic_begin() handler we
* can skip the setup stage.
*/
if (!rcrtc->initialized) {
rcar_du_crtc_get(rcrtc);
rcar_du_crtc_setup(rcrtc);
rcrtc->initialized = true;
}
rcar_du_crtc_start(rcrtc);
}
static void rcar_du_crtc_atomic_disable(struct drm_crtc *crtc,
struct drm_crtc_state *old_state)
{
struct rcar_du_crtc *rcrtc = to_rcar_crtc(crtc);
rcar_du_crtc_stop(rcrtc);
rcar_du_crtc_put(rcrtc);
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);
rcrtc->initialized = false;
rcrtc->outputs = 0;
}
static void rcar_du_crtc_atomic_begin(struct drm_crtc *crtc,
struct drm_crtc_state *old_crtc_state)
{
struct rcar_du_crtc *rcrtc = to_rcar_crtc(crtc);
WARN_ON(!crtc->state->enable);
/*
* If a mode set is in progress we can be called with the CRTC disabled.
* We then need to first setup the CRTC in order to configure planes.
* The .atomic_enable() handler will notice and skip the CRTC setup.
*/
if (!rcrtc->initialized) {
rcar_du_crtc_get(rcrtc);
rcar_du_crtc_setup(rcrtc);
rcrtc->initialized = true;
}
if (rcar_du_has(rcrtc->group->dev, RCAR_DU_FEATURE_VSP1_SOURCE))
rcar_du_vsp_atomic_begin(rcrtc);
}
static void rcar_du_crtc_atomic_flush(struct drm_crtc *crtc,
struct drm_crtc_state *old_crtc_state)
{
struct rcar_du_crtc *rcrtc = to_rcar_crtc(crtc);
struct drm_device *dev = rcrtc->crtc.dev;
unsigned long flags;
rcar_du_crtc_update_planes(rcrtc);
if (crtc->state->event) {
WARN_ON(drm_crtc_vblank_get(crtc) != 0);
spin_lock_irqsave(&dev->event_lock, flags);
rcrtc->event = crtc->state->event;
crtc->state->event = NULL;
spin_unlock_irqrestore(&dev->event_lock, flags);
}
if (rcar_du_has(rcrtc->group->dev, RCAR_DU_FEATURE_VSP1_SOURCE))
rcar_du_vsp_atomic_flush(rcrtc);
}
static const struct drm_crtc_helper_funcs crtc_helper_funcs = {
.atomic_begin = rcar_du_crtc_atomic_begin,
.atomic_flush = rcar_du_crtc_atomic_flush,
.atomic_enable = rcar_du_crtc_atomic_enable,
.atomic_disable = rcar_du_crtc_atomic_disable,
};
static int rcar_du_crtc_enable_vblank(struct drm_crtc *crtc)
{
struct rcar_du_crtc *rcrtc = to_rcar_crtc(crtc);
rcar_du_crtc_write(rcrtc, DSRCR, DSRCR_VBCL);
rcar_du_crtc_set(rcrtc, DIER, DIER_VBE);
rcrtc->vblank_enable = true;
return 0;
}
static void rcar_du_crtc_disable_vblank(struct drm_crtc *crtc)
{
struct rcar_du_crtc *rcrtc = to_rcar_crtc(crtc);
rcar_du_crtc_clr(rcrtc, DIER, DIER_VBE);
rcrtc->vblank_enable = false;
}
static const struct drm_crtc_funcs crtc_funcs = {
.reset = drm_atomic_helper_crtc_reset,
.destroy = drm_crtc_cleanup,
.set_config = drm_atomic_helper_set_config,
.page_flip = drm_atomic_helper_page_flip,
.atomic_duplicate_state = drm_atomic_helper_crtc_duplicate_state,
.atomic_destroy_state = drm_atomic_helper_crtc_destroy_state,
.enable_vblank = rcar_du_crtc_enable_vblank,
.disable_vblank = rcar_du_crtc_disable_vblank,
};
/* -----------------------------------------------------------------------------
* Interrupt Handling
*/
static irqreturn_t rcar_du_crtc_irq(int irq, void *arg)
{
struct rcar_du_crtc *rcrtc = arg;
struct rcar_du_device *rcdu = rcrtc->group->dev;
irqreturn_t ret = IRQ_NONE;
u32 status;
spin_lock(&rcrtc->vblank_lock);
status = rcar_du_crtc_read(rcrtc, DSSR);
rcar_du_crtc_write(rcrtc, DSRCR, status & DSRCR_MASK);
if (status & DSSR_VBK) {
/*
* Wake up the vblank wait if the counter reaches 0. This must
* be protected by the vblank_lock to avoid races in
* rcar_du_crtc_disable_planes().
*/
if (rcrtc->vblank_count) {
if (--rcrtc->vblank_count == 0)
wake_up(&rcrtc->vblank_wait);
}
}
spin_unlock(&rcrtc->vblank_lock);
if (status & DSSR_VBK) {
if (rcdu->info->gen < 3) {
drm_crtc_handle_vblank(&rcrtc->crtc);
rcar_du_crtc_finish_page_flip(rcrtc);
}
ret = IRQ_HANDLED;
}
return ret;
}
/* -----------------------------------------------------------------------------
* Initialization
*/
int rcar_du_crtc_create(struct rcar_du_group *rgrp, unsigned int index)
{
static const unsigned int mmio_offsets[] = {
DU0_REG_OFFSET, DU1_REG_OFFSET, DU2_REG_OFFSET, DU3_REG_OFFSET
};
struct rcar_du_device *rcdu = rgrp->dev;
struct platform_device *pdev = to_platform_device(rcdu->dev);
struct rcar_du_crtc *rcrtc = &rcdu->crtcs[index];
struct drm_crtc *crtc = &rcrtc->crtc;
struct drm_plane *primary;
unsigned int irqflags;
struct clk *clk;
char clk_name[9];
char *name;
int irq;
int ret;
/* Get the CRTC clock and the optional external clock. */
if (rcar_du_has(rcdu, RCAR_DU_FEATURE_CRTC_IRQ_CLOCK)) {
sprintf(clk_name, "du.%u", index);
name = clk_name;
} else {
name = NULL;
}
rcrtc->clock = devm_clk_get(rcdu->dev, name);
if (IS_ERR(rcrtc->clock)) {
dev_err(rcdu->dev, "no clock for CRTC %u\n", index);
return PTR_ERR(rcrtc->clock);
}
sprintf(clk_name, "dclkin.%u", index);
clk = devm_clk_get(rcdu->dev, clk_name);
if (!IS_ERR(clk)) {
rcrtc->extclock = clk;
} else if (PTR_ERR(rcrtc->clock) == -EPROBE_DEFER) {
dev_info(rcdu->dev, "can't get external clock %u\n", index);
return -EPROBE_DEFER;
}
init_waitqueue_head(&rcrtc->flip_wait);
init_waitqueue_head(&rcrtc->vblank_wait);
spin_lock_init(&rcrtc->vblank_lock);
rcrtc->group = rgrp;
rcrtc->mmio_offset = mmio_offsets[index];
rcrtc->index = index;
if (rcar_du_has(rcdu, RCAR_DU_FEATURE_VSP1_SOURCE))
primary = &rcrtc->vsp->planes[rcrtc->vsp_pipe].plane;
else
primary = &rgrp->planes[index % 2].plane;
ret = drm_crtc_init_with_planes(rcdu->ddev, crtc, primary,
NULL, &crtc_funcs, NULL);
if (ret < 0)
return ret;
drm_crtc_helper_add(crtc, &crtc_helper_funcs);
/* Start with vertical blanking interrupt reporting disabled. */
drm_crtc_vblank_off(crtc);
/* Register the interrupt handler. */
if (rcar_du_has(rcdu, RCAR_DU_FEATURE_CRTC_IRQ_CLOCK)) {
irq = platform_get_irq(pdev, index);
irqflags = 0;
} else {
irq = platform_get_irq(pdev, 0);
irqflags = IRQF_SHARED;
}
if (irq < 0) {
dev_err(rcdu->dev, "no IRQ for CRTC %u\n", index);
return irq;
}
ret = devm_request_irq(rcdu->dev, irq, rcar_du_crtc_irq, irqflags,
dev_name(rcdu->dev), rcrtc);
if (ret < 0) {
dev_err(rcdu->dev,
"failed to register IRQ for CRTC %u\n", index);
return ret;
}
return 0;
}
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