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drm/i915/chv: Preliminary interrupt support for Cherryview 

CHV has the Gen8 master interrupt register, as well as Gen8
GT/PCU interrupt registers.

The display block is based on VLV, with the main difference
of adding pipe C.

v2: Rewrite the order of operations to make more sense
    Don't bail out if MASTER_CTL register doesn't show an interrupt,
    as display interrupts aren't reported there.

v3: Rebase on top of Egbert Eich's hpd irq handling rework by using
the relevant port hotplug logic like for vlv.

v4: Rebase on top of Ben's gt irq #define refactoring.

v5: Squash in gen8_gt_irq_handler refactoring from Zhao Yakui
<yakui.zhao@intel.com>

v6: Adapt to upstream changes, dev_priv->irq_received is gone.

v7: Enable 3 the commented-out 3 pipe support.

v8: Rebase on top of Paulo's irq setup rework, use the renamed macros from
upstream.

v9: Grab irq_lock around i915_enable_pipestat()

FIXME: There's probably some potential for more shared code between bdw and chv.

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com> (v2)
Reviewed-by: Jani Nikula <jani.nikula@intel.com>
[danvet: Drop the unnecessary cast Jani spotted.]
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
This commit is contained in:
Ville Syrjälä 2014-04-09 20:40:52 +03:00 committed by Daniel Vetter
parent 44e895a8a2
commit 43f328d77b
1 changed files with 224 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

225
drivers/gpu/drm/i915/i915_irq.c
View File

@ -1703,6 +1703,95 @@ out:
return ret;
}
static irqreturn_t cherryview_irq_handler(int irq, void *arg)
{
struct drm_device *dev = (struct drm_device *) arg;
struct drm_i915_private *dev_priv = dev->dev_private;
u32 master_ctl, iir;
irqreturn_t ret = IRQ_NONE;
unsigned int pipes = 0;
master_ctl = I915_READ(GEN8_MASTER_IRQ);
I915_WRITE(GEN8_MASTER_IRQ, 0);
ret = gen8_gt_irq_handler(dev, dev_priv, master_ctl);
iir = I915_READ(VLV_IIR);
if (iir & (I915_DISPLAY_PIPE_A_VBLANK_INTERRUPT | I915_DISPLAY_PIPE_A_EVENT_INTERRUPT))
pipes |= 1 << 0;
if (iir & (I915_DISPLAY_PIPE_B_VBLANK_INTERRUPT | I915_DISPLAY_PIPE_B_EVENT_INTERRUPT))
pipes |= 1 << 1;
if (iir & (I915_DISPLAY_PIPE_C_VBLANK_INTERRUPT | I915_DISPLAY_PIPE_C_EVENT_INTERRUPT))
pipes |= 1 << 2;
if (pipes) {
u32 pipe_stats[I915_MAX_PIPES] = {};
unsigned long irqflags;
int pipe;
spin_lock_irqsave(&dev_priv->irq_lock, irqflags);
for_each_pipe(pipe) {
unsigned int reg;
if (!(pipes & (1 << pipe)))
continue;
reg = PIPESTAT(pipe);
pipe_stats[pipe] = I915_READ(reg);
/*
* Clear the PIPE*STAT regs before the IIR
*/
if (pipe_stats[pipe] & 0x8000ffff) {
if (pipe_stats[pipe] & PIPE_FIFO_UNDERRUN_STATUS)
DRM_DEBUG_DRIVER("pipe %c underrun\n",
pipe_name(pipe));
I915_WRITE(reg, pipe_stats[pipe]);
}
}
spin_unlock_irqrestore(&dev_priv->irq_lock, irqflags);
for_each_pipe(pipe) {
if (pipe_stats[pipe] & PIPE_VBLANK_INTERRUPT_STATUS)
drm_handle_vblank(dev, pipe);
if (pipe_stats[pipe] & PLANE_FLIP_DONE_INT_STATUS_VLV) {
intel_prepare_page_flip(dev, pipe);
intel_finish_page_flip(dev, pipe);
}
}
if (pipe_stats[0] & PIPE_GMBUS_INTERRUPT_STATUS)
gmbus_irq_handler(dev);
ret = IRQ_HANDLED;
}
/* Consume port. Then clear IIR or we'll miss events */
if (iir & I915_DISPLAY_PORT_INTERRUPT) {
u32 hotplug_status = I915_READ(PORT_HOTPLUG_STAT);
I915_WRITE(PORT_HOTPLUG_STAT, hotplug_status);
DRM_DEBUG_DRIVER("hotplug event received, stat 0x%08x\n",
hotplug_status);
if (hotplug_status & HOTPLUG_INT_STATUS_I915)
queue_work(dev_priv->wq,
&dev_priv->hotplug_work);
ret = IRQ_HANDLED;
}
I915_WRITE(VLV_IIR, iir);
I915_WRITE(GEN8_MASTER_IRQ, DE_MASTER_IRQ_CONTROL);
POSTING_READ(GEN8_MASTER_IRQ);
return ret;
}
static void ibx_irq_handler(struct drm_device *dev, u32 pch_iir)
{
struct drm_i915_private *dev_priv = dev->dev_private;
@ -2974,6 +3063,37 @@ static void gen8_irq_preinstall(struct drm_device *dev)
gen8_irq_reset(dev);
}
static void cherryview_irq_preinstall(struct drm_device *dev)
{
struct drm_i915_private *dev_priv = dev->dev_private;
int pipe;
I915_WRITE(GEN8_MASTER_IRQ, 0);
POSTING_READ(GEN8_MASTER_IRQ);
GEN8_IRQ_RESET_NDX(GT, 0);
GEN8_IRQ_RESET_NDX(GT, 1);
GEN8_IRQ_RESET_NDX(GT, 2);
GEN8_IRQ_RESET_NDX(GT, 3);
GEN5_IRQ_RESET(GEN8_PCU_);
POSTING_READ(GEN8_PCU_IIR);
I915_WRITE(DPINVGTT, DPINVGTT_STATUS_MASK_CHV);
I915_WRITE(PORT_HOTPLUG_EN, 0);
I915_WRITE(PORT_HOTPLUG_STAT, I915_READ(PORT_HOTPLUG_STAT));
for_each_pipe(pipe)
I915_WRITE(PIPESTAT(pipe), 0xffff);
I915_WRITE(VLV_IMR, 0xffffffff);
I915_WRITE(VLV_IER, 0x0);
I915_WRITE(VLV_IIR, 0xffffffff);
POSTING_READ(VLV_IIR);
}
static void ibx_hpd_irq_setup(struct drm_device *dev)
{
struct drm_i915_private *dev_priv = dev->dev_private;
@ -3291,6 +3411,50 @@ static int gen8_irq_postinstall(struct drm_device *dev)
return 0;
}
static int cherryview_irq_postinstall(struct drm_device *dev)
{
struct drm_i915_private *dev_priv = dev->dev_private;
u32 enable_mask = I915_DISPLAY_PORT_INTERRUPT |
I915_DISPLAY_PIPE_A_EVENT_INTERRUPT |
I915_DISPLAY_PIPE_A_VBLANK_INTERRUPT |
I915_DISPLAY_PIPE_B_EVENT_INTERRUPT |
I915_DISPLAY_PIPE_B_VBLANK_INTERRUPT |
I915_DISPLAY_PIPE_C_EVENT_INTERRUPT |
I915_DISPLAY_PIPE_C_VBLANK_INTERRUPT;
u32 pipestat_enable = PLANE_FLIP_DONE_INT_EN_VLV;
unsigned long irqflags;
int pipe;
/*
* Leave vblank interrupts masked initially. enable/disable will
* toggle them based on usage.
*/
dev_priv->irq_mask = ~enable_mask |
I915_DISPLAY_PIPE_A_VBLANK_INTERRUPT |
I915_DISPLAY_PIPE_B_VBLANK_INTERRUPT |
I915_DISPLAY_PIPE_C_VBLANK_INTERRUPT;
for_each_pipe(pipe)
I915_WRITE(PIPESTAT(pipe), 0xffff);
spin_lock_irqsave(&dev_priv->irq_lock, irqflags);
i915_enable_pipestat(dev_priv, 0, PIPE_GMBUS_EVENT_ENABLE);
for_each_pipe(pipe)
i915_enable_pipestat(dev_priv, pipe, pipestat_enable);
spin_unlock_irqrestore(&dev_priv->irq_lock, irqflags);
I915_WRITE(VLV_IIR, 0xffffffff);
I915_WRITE(VLV_IMR, dev_priv->irq_mask);
I915_WRITE(VLV_IER, enable_mask);
gen8_gt_irq_postinstall(dev_priv);
I915_WRITE(GEN8_MASTER_IRQ, MASTER_INTERRUPT_ENABLE);
POSTING_READ(GEN8_MASTER_IRQ);
return 0;
}
static void gen8_irq_uninstall(struct drm_device *dev)
{
struct drm_i915_private *dev_priv = dev->dev_private;
@ -3336,6 +3500,57 @@ static void valleyview_irq_uninstall(struct drm_device *dev)
POSTING_READ(VLV_IER);
}
static void cherryview_irq_uninstall(struct drm_device *dev)
{
struct drm_i915_private *dev_priv = dev->dev_private;
int pipe;
if (!dev_priv)
return;
I915_WRITE(GEN8_MASTER_IRQ, 0);
POSTING_READ(GEN8_MASTER_IRQ);
#define GEN8_IRQ_FINI_NDX(type, which) \
do { \
I915_WRITE(GEN8_##type##_IMR(which), 0xffffffff); \
I915_WRITE(GEN8_##type##_IER(which), 0); \
I915_WRITE(GEN8_##type##_IIR(which), 0xffffffff); \
POSTING_READ(GEN8_##type##_IIR(which)); \
I915_WRITE(GEN8_##type##_IIR(which), 0xffffffff); \
} while (0)
#define GEN8_IRQ_FINI(type) \
do { \
I915_WRITE(GEN8_##type##_IMR, 0xffffffff); \
I915_WRITE(GEN8_##type##_IER, 0); \
I915_WRITE(GEN8_##type##_IIR, 0xffffffff); \
POSTING_READ(GEN8_##type##_IIR); \
I915_WRITE(GEN8_##type##_IIR, 0xffffffff); \
} while (0)
GEN8_IRQ_FINI_NDX(GT, 0);
GEN8_IRQ_FINI_NDX(GT, 1);
GEN8_IRQ_FINI_NDX(GT, 2);
GEN8_IRQ_FINI_NDX(GT, 3);
GEN8_IRQ_FINI(PCU);
#undef GEN8_IRQ_FINI
#undef GEN8_IRQ_FINI_NDX
I915_WRITE(PORT_HOTPLUG_EN, 0);
I915_WRITE(PORT_HOTPLUG_STAT, I915_READ(PORT_HOTPLUG_STAT));
for_each_pipe(pipe)
I915_WRITE(PIPESTAT(pipe), 0xffff);
I915_WRITE(VLV_IMR, 0xffffffff);
I915_WRITE(VLV_IER, 0x0);
I915_WRITE(VLV_IIR, 0xffffffff);
POSTING_READ(VLV_IIR);
}
static void ironlake_irq_uninstall(struct drm_device *dev)
{
struct drm_i915_private *dev_priv = dev->dev_private;
@ -4041,7 +4256,15 @@ void intel_irq_init(struct drm_device *dev)
dev->driver->get_scanout_position = i915_get_crtc_scanoutpos;
}
if (IS_VALLEYVIEW(dev)) {
if (IS_CHERRYVIEW(dev)) {
dev->driver->irq_handler = cherryview_irq_handler;
dev->driver->irq_preinstall = cherryview_irq_preinstall;
dev->driver->irq_postinstall = cherryview_irq_postinstall;
dev->driver->irq_uninstall = cherryview_irq_uninstall;
dev->driver->enable_vblank = valleyview_enable_vblank;
dev->driver->disable_vblank = valleyview_disable_vblank;
dev_priv->display.hpd_irq_setup = i915_hpd_irq_setup;
} else if (IS_VALLEYVIEW(dev)) {
dev->driver->irq_handler = valleyview_irq_handler;
dev->driver->irq_preinstall = valleyview_irq_preinstall;
dev->driver->irq_postinstall = valleyview_irq_postinstall;