| lists.openwall.net | lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC | |
|
Open Source and information security mailing list archives
| ||
|
Date: Fri, 26 Aug 2011 11:18:13 +0100
From: Alan Cox <alan@...rguk.ukuu.org.uk>
To: greg@...ah.com, linux-kernel@...r.kernel.org
Subject: [PATCH 3/9] gma500: Add VBLANK support for Poulsbo hardware
From: Patrik Jakobsson <patrik.r.jakobsson@...il.com>
Signed-off-by: Patrik Jakobsson <patrik.r.jakobsson@...il.com>
Signed-off-by: Alan Cox <alan@...ux.intel.com>
---
drivers/staging/gma500/psb_drv.h | 3 ++
drivers/staging/gma500/psb_irq.c | 71 ++++++++++++++++++++++----------------
2 files changed, 44 insertions(+), 30 deletions(-)
diff --git a/drivers/staging/gma500/psb_drv.h b/drivers/staging/gma500/psb_drv.h
index 8cd4f1a..9cbb494 100644
--- a/drivers/staging/gma500/psb_drv.h
+++ b/drivers/staging/gma500/psb_drv.h
@@ -135,6 +135,9 @@ enum {
#define _PSB_IRQ_MSVDX_FLAG (1<<19)
#define _LNC_IRQ_TOPAZ_FLAG (1<<20)
+#define _PSB_PIPE_EVENT_FLAG (_PSB_VSYNC_PIPEA_FLAG | \
+ _PSB_VSYNC_PIPEB_FLAG)
+
/* This flag includes all the display IRQ bits excepts the vblank irqs. */
#define _MDFLD_DISP_ALL_IRQ_FLAG (_MDFLD_PIPEC_EVENT_FLAG | \
_MDFLD_PIPEB_EVENT_FLAG | \
diff --git a/drivers/staging/gma500/psb_irq.c b/drivers/staging/gma500/psb_irq.c
index 4a0fa42..36dd630 100644
--- a/drivers/staging/gma500/psb_irq.c
+++ b/drivers/staging/gma500/psb_irq.c
@@ -139,21 +139,10 @@ void mid_disable_pipe_event(struct drm_psb_private *dev_priv, int pipe)
}
/**
- * Display controller interrupt handler for vsync/vblank.
- *
- */
-static void mid_vblank_handler(struct drm_device *dev, uint32_t pipe)
-{
- drm_handle_vblank(dev, pipe);
-}
-
-
-/**
* Display controller interrupt handler for pipe event.
*
*/
-#define WAIT_STATUS_CLEAR_LOOP_COUNT 0xffff
-static void mid_pipe_event_handler(struct drm_device *dev, uint32_t pipe)
+static void mid_pipe_event_handler(struct drm_device *dev, int pipe)
{
struct drm_psb_private *dev_priv =
(struct drm_psb_private *) dev->dev_private;
@@ -162,6 +151,7 @@ static void mid_pipe_event_handler(struct drm_device *dev, uint32_t pipe)
uint32_t pipe_stat_reg = psb_pipestat(pipe);
uint32_t pipe_enable = dev_priv->pipestat[pipe];
uint32_t pipe_status = dev_priv->pipestat[pipe] >> 16;
+ uint32_t pipe_clear;
uint32_t i = 0;
spin_lock(&dev_priv->irqmask_lock);
@@ -172,27 +162,23 @@ static void mid_pipe_event_handler(struct drm_device *dev, uint32_t pipe)
spin_unlock(&dev_priv->irqmask_lock);
- /* clear the 2nd level interrupt status bits */
- /**
- * FIXME: shouldn't use while loop here. However, the interrupt
- * status 'sticky' bits cannot be cleared by setting '1' to that
- * bit once...
- */
- for (i = 0; i < WAIT_STATUS_CLEAR_LOOP_COUNT; i++) {
+ /* Clear the 2nd level interrupt status bits
+ * Sometimes the bits are very sticky so we repeat until they unstick */
+ for (i = 0; i < 0xffff; i++) {
PSB_WVDC32(PSB_RVDC32(pipe_stat_reg), pipe_stat_reg);
- (void) PSB_RVDC32(pipe_stat_reg);
+ pipe_clear = PSB_RVDC32(pipe_stat_reg) & pipe_status;
- if ((PSB_RVDC32(pipe_stat_reg) & pipe_status) == 0)
+ if (pipe_clear == 0)
break;
}
- if (i == WAIT_STATUS_CLEAR_LOOP_COUNT)
+ if (pipe_clear)
dev_err(dev->dev,
- "%s, can't clear the status bits in pipe_stat_reg, its value = 0x%x.\n",
- __func__, PSB_RVDC32(pipe_stat_reg));
+ "%s, can't clear status bits for pipe %d, its value = 0x%x.\n",
+ __func__, pipe, PSB_RVDC32(pipe_stat_reg));
if (pipe_stat_val & PIPE_VBLANK_STATUS)
- mid_vblank_handler(dev, pipe);
+ drm_handle_vblank(dev, pipe);
if (pipe_stat_val & PIPE_TE_STATUS)
drm_handle_vblank(dev, pipe);
@@ -203,8 +189,11 @@ static void mid_pipe_event_handler(struct drm_device *dev, uint32_t pipe)
*/
static void psb_vdc_interrupt(struct drm_device *dev, uint32_t vdc_stat)
{
- if (vdc_stat & _PSB_PIPEA_EVENT_FLAG)
+ if (vdc_stat & _PSB_VSYNC_PIPEA_FLAG)
mid_pipe_event_handler(dev, 0);
+
+ if (vdc_stat & _PSB_VSYNC_PIPEB_FLAG)
+ mid_pipe_event_handler(dev, 1);
}
irqreturn_t psb_irq_handler(DRM_IRQ_ARGS)
@@ -220,8 +209,13 @@ irqreturn_t psb_irq_handler(DRM_IRQ_ARGS)
vdc_stat = PSB_RVDC32(PSB_INT_IDENTITY_R);
+ if (vdc_stat & _PSB_PIPE_EVENT_FLAG)
+ dsp_int = 1;
+
+ /* FIXME: Handle Medfield
if (vdc_stat & _MDFLD_DISP_ALL_IRQ_FLAG)
dsp_int = 1;
+ */
if (vdc_stat & _PSB_IRQ_SGX_FLAG)
sgx_int = 1;
@@ -267,13 +261,18 @@ void psb_irq_preinstall(struct drm_device *dev)
if (gma_power_is_on(dev))
PSB_WVDC32(0xFFFFFFFF, PSB_HWSTAM);
if (dev->vblank_enabled[0])
- dev_priv->vdc_irq_mask |= _PSB_PIPEA_EVENT_FLAG;
+ dev_priv->vdc_irq_mask |= _PSB_VSYNC_PIPEA_FLAG;
+ if (dev->vblank_enabled[1])
+ dev_priv->vdc_irq_mask |= _PSB_VSYNC_PIPEB_FLAG;
+
+ /* FIXME: Handle Medfield irq mask
if (dev->vblank_enabled[1])
dev_priv->vdc_irq_mask |= _MDFLD_PIPEB_EVENT_FLAG;
if (dev->vblank_enabled[2])
dev_priv->vdc_irq_mask |= _MDFLD_PIPEC_EVENT_FLAG;
+ */
- /*This register is safe even if display island is off*/
+ /* This register is safe even if display island is off */
PSB_WVDC32(~dev_priv->vdc_irq_mask, PSB_INT_MASK_R);
spin_unlock_irqrestore(&dev_priv->irqmask_lock, irqflags);
}
@@ -471,7 +470,13 @@ int psb_enable_vblank(struct drm_device *dev, int pipe)
spin_lock_irqsave(&dev_priv->irqmask_lock, irqflags);
- mid_enable_pipe_event(dev_priv, pipe);
+ if (pipe == 0)
+ dev_priv->vdc_irq_mask |= _PSB_VSYNC_PIPEA_FLAG;
+ else if (pipe == 1)
+ dev_priv->vdc_irq_mask |= _PSB_VSYNC_PIPEB_FLAG;
+
+ PSB_WVDC32(~dev_priv->vdc_irq_mask, PSB_INT_MASK_R);
+ PSB_WVDC32(dev_priv->vdc_irq_mask, PSB_INT_ENABLE_R);
psb_enable_pipestat(dev_priv, pipe, PIPE_VBLANK_INTERRUPT_ENABLE);
spin_unlock_irqrestore(&dev_priv->irqmask_lock, irqflags);
@@ -493,7 +498,13 @@ void psb_disable_vblank(struct drm_device *dev, int pipe)
#endif
spin_lock_irqsave(&dev_priv->irqmask_lock, irqflags);
- mid_disable_pipe_event(dev_priv, pipe);
+ if (pipe == 0)
+ dev_priv->vdc_irq_mask &= ~_PSB_VSYNC_PIPEA_FLAG;
+ else if (pipe == 1)
+ dev_priv->vdc_irq_mask &= ~_PSB_VSYNC_PIPEB_FLAG;
+
+ PSB_WVDC32(~dev_priv->vdc_irq_mask, PSB_INT_MASK_R);
+ PSB_WVDC32(dev_priv->vdc_irq_mask, PSB_INT_ENABLE_R);
psb_disable_pipestat(dev_priv, pipe, PIPE_VBLANK_INTERRUPT_ENABLE);
spin_unlock_irqrestore(&dev_priv->irqmask_lock, irqflags);
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
Powered by blists - more mailing lists