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path: root/drivers/char/drm/via_dma.c
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Diffstat (limited to 'drivers/char/drm/via_dma.c')
-rw-r--r--drivers/char/drm/via_dma.c59
1 files changed, 53 insertions, 6 deletions
diff --git a/drivers/char/drm/via_dma.c b/drivers/char/drm/via_dma.c
index 94baec692b5..7a339dba6a6 100644
--- a/drivers/char/drm/via_dma.c
+++ b/drivers/char/drm/via_dma.c
@@ -126,6 +126,8 @@ via_cmdbuf_wait(drm_via_private_t * dev_priv, unsigned int size)
hw_addr, cur_addr, next_addr);
return -1;
}
+ if ((cur_addr < hw_addr) && (next_addr >= hw_addr))
+ msleep(1);
} while ((cur_addr < hw_addr) && (next_addr >= hw_addr));
return 0;
}
@@ -416,27 +418,50 @@ static int via_hook_segment(drm_via_private_t * dev_priv,
int paused, count;
volatile uint32_t *paused_at = dev_priv->last_pause_ptr;
uint32_t reader,ptr;
+ uint32_t diff;
paused = 0;
via_flush_write_combine();
(void) *(volatile uint32_t *)(via_get_dma(dev_priv) -1);
+
*paused_at = pause_addr_lo;
via_flush_write_combine();
(void) *paused_at;
+
reader = *(dev_priv->hw_addr_ptr);
ptr = ((volatile char *)paused_at - dev_priv->dma_ptr) +
dev_priv->dma_offset + (uint32_t) dev_priv->agpAddr + 4;
+
dev_priv->last_pause_ptr = via_get_dma(dev_priv) - 1;
- if ((ptr - reader) <= dev_priv->dma_diff ) {
- count = 10000000;
- while (!(paused = (VIA_READ(0x41c) & 0x80000000)) && count--);
+ /*
+ * If there is a possibility that the command reader will
+ * miss the new pause address and pause on the old one,
+ * In that case we need to program the new start address
+ * using PCI.
+ */
+
+ diff = (uint32_t) (ptr - reader) - dev_priv->dma_diff;
+ count = 10000000;
+ while(diff == 0 && count--) {
+ paused = (VIA_READ(0x41c) & 0x80000000);
+ if (paused)
+ break;
+ reader = *(dev_priv->hw_addr_ptr);
+ diff = (uint32_t) (ptr - reader) - dev_priv->dma_diff;
}
+ paused = VIA_READ(0x41c) & 0x80000000;
+
if (paused && !no_pci_fire) {
reader = *(dev_priv->hw_addr_ptr);
- if ((ptr - reader) == dev_priv->dma_diff) {
-
+ diff = (uint32_t) (ptr - reader) - dev_priv->dma_diff;
+ diff &= (dev_priv->dma_high - 1);
+ if (diff != 0 && diff < (dev_priv->dma_high >> 1)) {
+ DRM_ERROR("Paused at incorrect address. "
+ "0x%08x, 0x%08x 0x%08x\n",
+ ptr, reader, dev_priv->dma_diff);
+ } else if (diff == 0) {
/*
* There is a concern that these writes may stall the PCI bus
* if the GPU is not idle. However, idling the GPU first
@@ -577,6 +602,7 @@ static void via_cmdbuf_jump(drm_via_private_t * dev_priv)
uint32_t pause_addr_lo, pause_addr_hi;
uint32_t jump_addr_lo, jump_addr_hi;
volatile uint32_t *last_pause_ptr;
+ uint32_t dma_low_save1, dma_low_save2;
agp_base = dev_priv->dma_offset + (uint32_t) dev_priv->agpAddr;
via_align_cmd(dev_priv, HC_HAGPBpID_JUMP, 0, &jump_addr_hi,
@@ -603,8 +629,29 @@ static void via_cmdbuf_jump(drm_via_private_t * dev_priv)
&pause_addr_lo, 0);
*last_pause_ptr = pause_addr_lo;
+ dma_low_save1 = dev_priv->dma_low;
- via_hook_segment( dev_priv, jump_addr_hi, jump_addr_lo, 0);
+ /*
+ * Now, set a trap that will pause the regulator if it tries to rerun the old
+ * command buffer. (Which may happen if via_hook_segment detecs a command regulator pause
+ * and reissues the jump command over PCI, while the regulator has already taken the jump
+ * and actually paused at the current buffer end).
+ * There appears to be no other way to detect this condition, since the hw_addr_pointer
+ * does not seem to get updated immediately when a jump occurs.
+ */
+
+ last_pause_ptr =
+ via_align_cmd(dev_priv, HC_HAGPBpID_PAUSE, 0, &pause_addr_hi,
+ &pause_addr_lo, 0) - 1;
+ via_align_cmd(dev_priv, HC_HAGPBpID_PAUSE, 0, &pause_addr_hi,
+ &pause_addr_lo, 0);
+ *last_pause_ptr = pause_addr_lo;
+
+ dma_low_save2 = dev_priv->dma_low;
+ dev_priv->dma_low = dma_low_save1;
+ via_hook_segment(dev_priv, jump_addr_hi, jump_addr_lo, 0);
+ dev_priv->dma_low = dma_low_save2;
+ via_hook_segment(dev_priv, pause_addr_hi, pause_addr_lo, 0);
}