Commit dc96e9b8 authored by Chris Wilson's avatar Chris Wilson
Browse files

drm/i915: Try to reset gen2 devices.



So far only found registers for i830, i845, i865 and one of those has no
effect on i865!

At this moment in time, attempting to reset i8xx is a little
optimistic...
Signed-off-by: default avatarChris Wilson <chris@chris-wilson.co.uk>
parent 069efc1d
......@@ -342,6 +342,36 @@ int i915_resume(struct drm_device *dev)
return 0;
}
static int i8xx_do_reset(struct drm_device *dev, u8 flags)
{
struct drm_i915_private *dev_priv = dev->dev_private;
if (IS_I85X(dev))
return -ENODEV;
I915_WRITE(D_STATE, I915_READ(D_STATE) | DSTATE_GFX_RESET_I830);
POSTING_READ(D_STATE);
if (IS_I830(dev) || IS_845G(dev)) {
I915_WRITE(DEBUG_RESET_I830,
DEBUG_RESET_DISPLAY |
DEBUG_RESET_RENDER |
DEBUG_RESET_FULL);
POSTING_READ(DEBUG_RESET_I830);
msleep(1);
I915_WRITE(DEBUG_RESET_I830, 0);
POSTING_READ(DEBUG_RESET_I830);
}
msleep(1);
I915_WRITE(D_STATE, I915_READ(D_STATE) & ~DSTATE_GFX_RESET_I830);
POSTING_READ(D_STATE);
return 0;
}
static int i965_reset_complete(struct drm_device *dev)
{
u8 gdrst;
......@@ -410,6 +440,9 @@ int i915_reset(struct drm_device *dev, u8 flags)
case 4:
ret = i965_do_reset(dev, flags);
break;
case 2:
ret = i8xx_do_reset(dev, flags);
break;
}
if (ret) {
DRM_ERROR("Failed to reset chip.\n");
......
......@@ -216,6 +216,16 @@
#define PIPE_CONTROL_GLOBAL_GTT (1<<2) /* in addr dword */
#define PIPE_CONTROL_STALL_EN (1<<1) /* in addr word, Ironlake+ only */
/*
* Reset registers
*/
#define DEBUG_RESET_I830 0x6070
#define DEBUG_RESET_FULL (1<<7)
#define DEBUG_RESET_RENDER (1<<8)
#define DEBUG_RESET_DISPLAY (1<<9)
/*
* Fence registers
*/
......@@ -763,6 +773,7 @@
#define DPLLA_TEST_M_BYPASS (1 << 2)
#define DPLLA_INPUT_BUFFER_ENABLE (1 << 0)
#define D_STATE 0x6104
#define DSTATE_GFX_RESET_I830 (1<<6)
#define DSTATE_PLL_D3_OFF (1<<3)
#define DSTATE_GFX_CLOCK_GATING (1<<1)
#define DSTATE_DOT_CLOCK_GATING (1<<0)
......
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