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drm: add option to force writeback off.

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In order to get some better debugging from people about certain hangs/crashes
we need to be able to turn AGP writeback off permanently...

Signed-off-by: Dave Airlie <airlied@linux.ie>
This commit is contained in:
Dave Airlie 2005-09-30 17:09:07 +10:00 committed by Dave Airlie
parent b6ce156c41
commit 689b9d74b1
3 changed files with 10 additions and 0 deletions
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4
drivers/char/drm/radeon_cp.c
View File

@ -1205,6 +1205,10 @@ static void radeon_cp_init_ring_buffer(drm_device_t * dev,
dev_priv->writeback_works = 0;
DRM_DEBUG("writeback test failed\n");
}
if (radeon_no_wb == 1) {
dev_priv->writeback_works = 0;
DRM_DEBUG("writeback forced off\n");
}
dev_priv->sarea_priv->last_frame = dev_priv->scratch[0] = 0;
RADEON_WRITE(RADEON_LAST_FRAME_REG, dev_priv->sarea_priv->last_frame);

5
drivers/char/drm/radeon_drv.c
View File

@ -37,6 +37,11 @@
#include "drm_pciids.h"
int radeon_no_wb;
MODULE_PARM_DESC(no_wb, "Disable AGP writeback for scratch registers\n");
module_param_named(no_wb, radeon_no_wb, int, 0444);
static int postinit(struct drm_device *dev, unsigned long flags)
{
DRM_INFO("Initialized %s %d.%d.%d %s on minor %d: %s\n",

1
drivers/char/drm/radeon_drv.h
View File

@ -281,6 +281,7 @@ typedef struct drm_radeon_buf_priv {
u32 age;
} drm_radeon_buf_priv_t;
extern int radeon_no_wb;
/* radeon_cp.c */
extern int radeon_cp_init(DRM_IOCTL_ARGS);
extern int radeon_cp_start(DRM_IOCTL_ARGS);