From: Sean Paul <seanpaul@chromium.org>
Date: Mon, 5 Mar 2018 23:22:54 +0100
Subject: drm/rockchip: Don't use atomic constructs for psr
MIME-Version: 1.0
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Git-commit: 60beeccc72cabefcb8874fec542b3142e262b6c2
Patch-mainline: v4.17-rc1
References: FATE#326289 FATE#326079 FATE#326049 FATE#322398 FATE#326166
Instead of using timer and spinlocks, use delayed_work and
mutexes for rockchip psr. This allows us to make blocking
calls when enabling/disabling psr (which is sort of important
given we're talking over dpcd to the display).
Cc: Caesar Wang <wxt@rock-chips.com>
Cc: 征增 王 <wzz@rock-chips.com>
Cc: Stéphane Marchesin <marcheu@chromium.org>
Signed-off-by: Sean Paul <seanpaul@chromium.org>
Signed-off-by: Thierry Escande <thierry.escande@collabora.com>
Signed-off-by: Enric Balletbo i Serra <enric.balletbo@collabora.com>
Signed-off-by: Heiko Stuebner <heiko@sntech.de>
Link: https://patchwork.freedesktop.org/patch/msgid/20180305222324.5872-3-enric.balletbo@collabora.com
Acked-by: Petr Tesarik <ptesarik@suse.com>
---
drivers/gpu/drm/rockchip/rockchip_drm_drv.c | 2
drivers/gpu/drm/rockchip/rockchip_drm_drv.h | 2
drivers/gpu/drm/rockchip/rockchip_drm_psr.c | 68 +++++++++++-----------------
3 files changed, 31 insertions(+), 41 deletions(-)
--- a/drivers/gpu/drm/rockchip/rockchip_drm_drv.c
+++ b/drivers/gpu/drm/rockchip/rockchip_drm_drv.c
@@ -134,7 +134,7 @@ static int rockchip_drm_bind(struct devi
drm_dev->dev_private = private;
INIT_LIST_HEAD(&private->psr_list);
- spin_lock_init(&private->psr_list_lock);
+ mutex_init(&private->psr_list_lock);
ret = rockchip_drm_init_iommu(drm_dev);
if (ret)
--- a/drivers/gpu/drm/rockchip/rockchip_drm_drv.h
+++ b/drivers/gpu/drm/rockchip/rockchip_drm_drv.h
@@ -55,7 +55,7 @@ struct rockchip_drm_private {
struct mutex mm_lock;
struct drm_mm mm;
struct list_head psr_list;
- spinlock_t psr_list_lock;
+ struct mutex psr_list_lock;
};
int rockchip_drm_dma_attach_device(struct drm_device *drm_dev,
--- a/drivers/gpu/drm/rockchip/rockchip_drm_psr.c
+++ b/drivers/gpu/drm/rockchip/rockchip_drm_psr.c
@@ -18,7 +18,7 @@
#include "rockchip_drm_drv.h"
#include "rockchip_drm_psr.h"
-#define PSR_FLUSH_TIMEOUT msecs_to_jiffies(100)
+#define PSR_FLUSH_TIMEOUT_MS 100
enum psr_state {
PSR_FLUSH,
@@ -30,11 +30,11 @@ struct psr_drv {
struct list_head list;
struct drm_encoder *encoder;
- spinlock_t lock;
+ struct mutex lock;
bool active;
enum psr_state state;
- struct timer_list flush_timer;
+ struct delayed_work flush_work;
void (*set)(struct drm_encoder *encoder, bool enable);
};
@@ -43,9 +43,8 @@ static struct psr_drv *find_psr_by_crtc(
{
struct rockchip_drm_private *drm_drv = crtc->dev->dev_private;
struct psr_drv *psr;
- unsigned long flags;
- spin_lock_irqsave(&drm_drv->psr_list_lock, flags);
+ mutex_lock(&drm_drv->psr_list_lock);
list_for_each_entry(psr, &drm_drv->psr_list, list) {
if (psr->encoder->crtc == crtc)
goto out;
@@ -53,7 +52,7 @@ static struct psr_drv *find_psr_by_crtc(
psr = ERR_PTR(-ENODEV);
out:
- spin_unlock_irqrestore(&drm_drv->psr_list_lock, flags);
+ mutex_unlock(&drm_drv->psr_list_lock);
return psr;
}
@@ -61,9 +60,8 @@ static struct psr_drv *find_psr_by_encod
{
struct rockchip_drm_private *drm_drv = encoder->dev->dev_private;
struct psr_drv *psr;
- unsigned long flags;
- spin_lock_irqsave(&drm_drv->psr_list_lock, flags);
+ mutex_lock(&drm_drv->psr_list_lock);
list_for_each_entry(psr, &drm_drv->psr_list, list) {
if (psr->encoder == encoder)
goto out;
@@ -71,7 +69,7 @@ static struct psr_drv *find_psr_by_encod
psr = ERR_PTR(-ENODEV);
out:
- spin_unlock_irqrestore(&drm_drv->psr_list_lock, flags);
+ mutex_unlock(&drm_drv->psr_list_lock);
return psr;
}
@@ -112,23 +110,21 @@ static void psr_set_state_locked(struct
static void psr_set_state(struct psr_drv *psr, enum psr_state state)
{
- unsigned long flags;
-
- spin_lock_irqsave(&psr->lock, flags);
+ mutex_lock(&psr->lock);
psr_set_state_locked(psr, state);
- spin_unlock_irqrestore(&psr->lock, flags);
+ mutex_unlock(&psr->lock);
}
-static void psr_flush_handler(unsigned long data)
+static void psr_flush_handler(struct work_struct *work)
{
- struct psr_drv *psr = (struct psr_drv *)data;
- unsigned long flags;
+ struct psr_drv *psr = container_of(to_delayed_work(work),
+ struct psr_drv, flush_work);
/* If the state has changed since we initiated the flush, do nothing */
- spin_lock_irqsave(&psr->lock, flags);
+ mutex_lock(&psr->lock);
if (psr->state == PSR_FLUSH)
psr_set_state_locked(psr, PSR_ENABLE);
- spin_unlock_irqrestore(&psr->lock, flags);
+ mutex_unlock(&psr->lock);
}
/**
@@ -141,14 +137,13 @@ static void psr_flush_handler(unsigned l
int rockchip_drm_psr_activate(struct drm_encoder *encoder)
{
struct psr_drv *psr = find_psr_by_encoder(encoder);
- unsigned long flags;
if (IS_ERR(psr))
return PTR_ERR(psr);
- spin_lock_irqsave(&psr->lock, flags);
+ mutex_lock(&psr->lock);
psr->active = true;
- spin_unlock_irqrestore(&psr->lock, flags);
+ mutex_unlock(&psr->lock);
return 0;
}
@@ -164,15 +159,14 @@ EXPORT_SYMBOL(rockchip_drm_psr_activate)
int rockchip_drm_psr_deactivate(struct drm_encoder *encoder)
{
struct psr_drv *psr = find_psr_by_encoder(encoder);
- unsigned long flags;
if (IS_ERR(psr))
return PTR_ERR(psr);
- spin_lock_irqsave(&psr->lock, flags);
+ mutex_lock(&psr->lock);
psr->active = false;
- spin_unlock_irqrestore(&psr->lock, flags);
- del_timer_sync(&psr->flush_timer);
+ mutex_unlock(&psr->lock);
+ cancel_delayed_work_sync(&psr->flush_work);
return 0;
}
@@ -180,9 +174,8 @@ EXPORT_SYMBOL(rockchip_drm_psr_deactivat
static void rockchip_drm_do_flush(struct psr_drv *psr)
{
- mod_timer(&psr->flush_timer,
- round_jiffies_up(jiffies + PSR_FLUSH_TIMEOUT));
psr_set_state(psr, PSR_FLUSH);
+ mod_delayed_work(system_wq, &psr->flush_work, PSR_FLUSH_TIMEOUT_MS);
}
/**
@@ -219,12 +212,11 @@ void rockchip_drm_psr_flush_all(struct d
{
struct rockchip_drm_private *drm_drv = dev->dev_private;
struct psr_drv *psr;
- unsigned long flags;
- spin_lock_irqsave(&drm_drv->psr_list_lock, flags);
+ mutex_lock(&drm_drv->psr_list_lock);
list_for_each_entry(psr, &drm_drv->psr_list, list)
rockchip_drm_do_flush(psr);
- spin_unlock_irqrestore(&drm_drv->psr_list_lock, flags);
+ mutex_unlock(&drm_drv->psr_list_lock);
}
EXPORT_SYMBOL(rockchip_drm_psr_flush_all);
@@ -241,7 +233,6 @@ int rockchip_drm_psr_register(struct drm
{
struct rockchip_drm_private *drm_drv = encoder->dev->dev_private;
struct psr_drv *psr;
- unsigned long flags;
if (!encoder || !psr_set)
return -EINVAL;
@@ -250,17 +241,17 @@ int rockchip_drm_psr_register(struct drm
if (!psr)
return -ENOMEM;
- setup_timer(&psr->flush_timer, psr_flush_handler, (unsigned long)psr);
- spin_lock_init(&psr->lock);
+ INIT_DELAYED_WORK(&psr->flush_work, psr_flush_handler);
+ mutex_init(&psr->lock);
psr->active = true;
psr->state = PSR_DISABLE;
psr->encoder = encoder;
psr->set = psr_set;
- spin_lock_irqsave(&drm_drv->psr_list_lock, flags);
+ mutex_lock(&drm_drv->psr_list_lock);
list_add_tail(&psr->list, &drm_drv->psr_list);
- spin_unlock_irqrestore(&drm_drv->psr_list_lock, flags);
+ mutex_unlock(&drm_drv->psr_list_lock);
return 0;
}
@@ -278,16 +269,15 @@ void rockchip_drm_psr_unregister(struct
{
struct rockchip_drm_private *drm_drv = encoder->dev->dev_private;
struct psr_drv *psr, *n;
- unsigned long flags;
- spin_lock_irqsave(&drm_drv->psr_list_lock, flags);
+ mutex_lock(&drm_drv->psr_list_lock);
list_for_each_entry_safe(psr, n, &drm_drv->psr_list, list) {
if (psr->encoder == encoder) {
- del_timer(&psr->flush_timer);
+ cancel_delayed_work_sync(&psr->flush_work);
list_del(&psr->list);
kfree(psr);
}
}
- spin_unlock_irqrestore(&drm_drv->psr_list_lock, flags);
+ mutex_unlock(&drm_drv->psr_list_lock);
}
EXPORT_SYMBOL(rockchip_drm_psr_unregister);