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Commit 689b9d74 authored by Dave Airlie's avatar Dave Airlie Committed by Dave Airlie
Browse files

drm: add option to force writeback off. 



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: default avatarDave Airlie <airlied@linux.ie>
parent b6ce156c

drivers/char/drm/radeon_cp.c

+4 −0
Original line number Diff line number Diff line
@@ -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);

drivers/char/drm/radeon_drv.c

+5 −0
Original line number Diff line number Diff line
@@ -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",

drivers/char/drm/radeon_drv.h

+1 −0
Original line number Diff line number Diff line
@@ -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);