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Message-Id: <1416004955-28749-1-git-send-email-hali@codeaurora.org>
Date: Fri, 14 Nov 2014 17:42:34 -0500
From: Hai Li <hali@...eaurora.org>
To: dri-devel@...ts.freedesktop.org
Cc: linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org,
robdclark@...il.com, Hai Li <hali@...eaurora.org>
Subject: [PATCH 1/2] drm/msm: Register irq handler for each sub-system in mdss
All the sub-systems in mdss share the same irq. This change provides
the sub-systems with the interfaces to register/unregister their own
irq handlers.
With this change, struct mdp5_kms does not have to keep the hdmi or
edp context.
Signed-off-by: Hai Li <hali@...eaurora.org>
---
drivers/gpu/drm/msm/hdmi/hdmi.c | 12 +++-
drivers/gpu/drm/msm/mdp/mdp5/mdp5_irq.c | 107 ++++++++++++++++++++++++++++++--
drivers/gpu/drm/msm/msm_drv.h | 19 +++++-
3 files changed, 130 insertions(+), 8 deletions(-)
diff --git a/drivers/gpu/drm/msm/hdmi/hdmi.c b/drivers/gpu/drm/msm/hdmi/hdmi.c
index 9d00dcb..aaf5e2b 100644
--- a/drivers/gpu/drm/msm/hdmi/hdmi.c
+++ b/drivers/gpu/drm/msm/hdmi/hdmi.c
@@ -39,7 +39,7 @@ void hdmi_set_mode(struct hdmi *hdmi, bool power_on)
power_on ? "Enable" : "Disable", ctrl);
}
-irqreturn_t hdmi_irq(int irq, void *dev_id)
+static irqreturn_t hdmi_irq(int irq, void *dev_id)
{
struct hdmi *hdmi = dev_id;
@@ -59,6 +59,9 @@ void hdmi_destroy(struct kref *kref)
struct hdmi *hdmi = container_of(kref, struct hdmi, refcount);
struct hdmi_phy *phy = hdmi->phy;
+ if (hdmi->config->shared_irq)
+ msm_shared_irq_unregister(MSM_SUBSYS_HDMI);
+
if (phy)
phy->funcs->destroy(phy);
@@ -221,6 +224,13 @@ struct hdmi *hdmi_init(struct drm_device *dev, struct drm_encoder *encoder)
hdmi->irq, ret);
goto fail;
}
+ } else {
+ ret = msm_shared_irq_register(MSM_SUBSYS_HDMI, hdmi_irq, hdmi);
+ if (ret < 0) {
+ dev_err(dev->dev, "failed to register shared IRQ: %d\n",
+ ret);
+ goto fail;
+ }
}
encoder->bridge = hdmi->bridge;
diff --git a/drivers/gpu/drm/msm/mdp/mdp5/mdp5_irq.c b/drivers/gpu/drm/msm/mdp/mdp5/mdp5_irq.c
index f2b985b..2973c1c 100644
--- a/drivers/gpu/drm/msm/mdp/mdp5/mdp5_irq.c
+++ b/drivers/gpu/drm/msm/mdp/mdp5/mdp5_irq.c
@@ -1,4 +1,5 @@
/*
+ * Copyright (c) 2014, The Linux Foundation. All rights reserved.
* Copyright (C) 2013 Red Hat
* Author: Rob Clark <robdclark@...il.com>
*
@@ -19,6 +20,75 @@
#include "msm_drv.h"
#include "mdp5_kms.h"
+struct msm_subsys_shared_irq {
+ u32 mask;
+ u32 count;
+
+ /* Filled by sub system */
+ irqreturn_t (*handler)(int irq, void *dev_id);
+ void *data;
+};
+
+static struct msm_subsys_shared_irq msm_shared_irqs[MSM_SUBSYS_COUNT] = {
+ [MSM_SUBSYS_MDP] = {.mask = MDP5_HW_INTR_STATUS_INTR_MDP,
+ .count = 0},
+ [MSM_SUBSYS_DSI_0] = {.mask = MDP5_HW_INTR_STATUS_INTR_DSI0,
+ .count = 0},
+ [MSM_SUBSYS_DSI_1] = {.mask = MDP5_HW_INTR_STATUS_INTR_DSI1,
+ .count = 0},
+ [MSM_SUBSYS_HDMI] = {.mask = MDP5_HW_INTR_STATUS_INTR_HDMI,
+ .count = 0},
+ [MSM_SUBSYS_EDP] = {.mask = MDP5_HW_INTR_STATUS_INTR_EDP,
+ .count = 0},
+};
+
+static irqreturn_t mdp5_irq_mdp(int irq, void *dev_id);
+
+int msm_shared_irq_register(enum msm_sub_system sys_id,
+ irqreturn_t (*handler)(int irq, void *dev_id), void *data)
+{
+ if (sys_id >= MSM_SUBSYS_COUNT) {
+ DRM_ERROR("Invalid sys_id %d", sys_id);
+ return -EINVAL;
+ }
+
+ if (msm_shared_irqs[sys_id].handler != NULL) {
+ DRM_ERROR("sys %d irq already registered", sys_id);
+ return -EBUSY;
+ }
+
+ msm_shared_irqs[sys_id].data = data;
+ msm_shared_irqs[sys_id].handler = handler;
+
+ return 0;
+}
+
+/*
+ * This function should be called after the interrupt
+ * on the sub-system is disabled.
+ */
+int msm_shared_irq_unregister(enum msm_sub_system sys_id)
+{
+ if (sys_id >= MSM_SUBSYS_COUNT) {
+ DRM_ERROR("Invalid sys_id %d", sys_id);
+ return -EINVAL;
+ }
+
+ msm_shared_irqs[sys_id].handler = NULL;
+ msm_shared_irqs[sys_id].data = NULL;
+
+ /*
+ * Make sure irq_handler and data is invalid.
+ * Then we only need to wait until the last pending interrupt is done.
+ */
+ wmb();
+
+ while (msm_shared_irqs[sys_id].count & 0x1)
+ usleep_range(100, 1000);
+
+ return 0;
+}
+
void mdp5_set_irqmask(struct mdp_kms *mdp_kms, uint32_t irqmask)
{
mdp5_write(to_mdp5_kms(mdp_kms), REG_MDP5_INTR_EN, irqmask);
@@ -47,6 +117,9 @@ int mdp5_irq_postinstall(struct msm_kms *kms)
MDP5_IRQ_INTF2_UNDER_RUN |
MDP5_IRQ_INTF3_UNDER_RUN;
+ /* Register mdp irq to mdss */
+ msm_shared_irq_register(MSM_SUBSYS_MDP, mdp5_irq_mdp, mdp_kms);
+
mdp_irq_register(mdp_kms, error_handler);
return 0;
@@ -56,10 +129,15 @@ void mdp5_irq_uninstall(struct msm_kms *kms)
{
struct mdp5_kms *mdp5_kms = to_mdp5_kms(to_mdp_kms(kms));
mdp5_write(mdp5_kms, REG_MDP5_INTR_EN, 0x00000000);
+
+ /* Make sure interrupt is disabled before remove irq. */
+ wmb();
+ msm_shared_irq_unregister(MSM_SUBSYS_MDP);
}
-static void mdp5_irq_mdp(struct mdp_kms *mdp_kms)
+static irqreturn_t mdp5_irq_mdp(int irq, void *dev_id)
{
+ struct mdp_kms *mdp_kms = (struct mdp_kms *)dev_id;
struct mdp5_kms *mdp5_kms = to_mdp5_kms(mdp_kms);
struct drm_device *dev = mdp5_kms->dev;
struct msm_drm_private *priv = dev->dev_private;
@@ -76,23 +154,40 @@ static void mdp5_irq_mdp(struct mdp_kms *mdp_kms)
for (id = 0; id < priv->num_crtcs; id++)
if (status & mdp5_crtc_vblank(priv->crtcs[id]))
drm_handle_vblank(dev, id);
+
+ return IRQ_HANDLED;
}
irqreturn_t mdp5_irq(struct msm_kms *kms)
{
struct mdp_kms *mdp_kms = to_mdp_kms(kms);
struct mdp5_kms *mdp5_kms = to_mdp5_kms(mdp_kms);
+ struct msm_subsys_shared_irq *irq;
uint32_t intr;
+ int i;
intr = mdp5_read(mdp5_kms, REG_MDP5_HW_INTR_STATUS);
VERB("intr=%08x", intr);
- if (intr & MDP5_HW_INTR_STATUS_INTR_MDP)
- mdp5_irq_mdp(mdp_kms);
-
- if (intr & MDP5_HW_INTR_STATUS_INTR_HDMI)
- hdmi_irq(0, mdp5_kms->hdmi);
+ for (i = 0; i < MSM_SUBSYS_COUNT; i++) {
+ irq = &msm_shared_irqs[i];
+ if (intr & irq->mask) {
+ irq->count++;
+
+ /*
+ * These 2 wmb() ensure count is odd number
+ * during handler is running.
+ */
+ wmb();
+ if ((irq->handler != NULL) && (irq->data != NULL))
+ irq->handler(0, irq->data);
+
+ /* Make sure count increments after handler is done */
+ wmb();
+ irq->count++;
+ }
+ }
return IRQ_HANDLED;
}
diff --git a/drivers/gpu/drm/msm/msm_drv.h b/drivers/gpu/drm/msm/msm_drv.h
index 67f9d0a..718ac55 100644
--- a/drivers/gpu/drm/msm/msm_drv.h
+++ b/drivers/gpu/drm/msm/msm_drv.h
@@ -127,6 +127,16 @@ struct msm_drm_private {
} vram;
};
+/* For mdp5 only */
+enum msm_sub_system {
+ MSM_SUBSYS_MDP = 0,
+ MSM_SUBSYS_DSI_0,
+ MSM_SUBSYS_DSI_1,
+ MSM_SUBSYS_HDMI,
+ MSM_SUBSYS_EDP,
+ MSM_SUBSYS_COUNT
+};
+
struct msm_format {
uint32_t pixel_format;
};
@@ -145,6 +155,14 @@ void __msm_fence_worker(struct work_struct *work);
(_cb)->func = _func; \
} while (0)
+/*
+ * For mdp5 only, callers should call these 2 functions
+ * only if the irqs are shared with others.
+ */
+int msm_shared_irq_register(enum msm_sub_system sys_id,
+ irqreturn_t (*handler)(int irq, void *dev_id), void *data);
+int msm_shared_irq_unregister(enum msm_sub_system sys_id);
+
int msm_register_mmu(struct drm_device *dev, struct msm_mmu *mmu);
int msm_wait_fence_interruptable(struct drm_device *dev, uint32_t fence,
@@ -203,7 +221,6 @@ struct drm_fb_helper *msm_fbdev_init(struct drm_device *dev);
struct hdmi;
struct hdmi *hdmi_init(struct drm_device *dev, struct drm_encoder *encoder);
-irqreturn_t hdmi_irq(int irq, void *dev_id);
void __init hdmi_register(void);
void __exit hdmi_unregister(void);
--
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hosted by The Linux Foundation
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