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Revision 53292cdb066950611e5bc2e0eb109c7edb42af78 authored by Michel Thierry on 15 April 2015, 17:11:33 UTC, committed by Jani Nikula on 23 April 2015, 20:56:52 UTC 
drm/i915: Workaround to avoid lite restore with HEAD==TAIL
 
WaIdleLiteRestore is an execlists-only workaround, and requires the driver
to ensure that any context always has HEAD!=TAIL when attempting lite
restore.

Add two extra MI_NOOP instructions at the end of each request, but keep
the requests tail pointing before the MI_NOOPs. We may not need to
executed them, and this is why request->tail is sampled before adding
these extra instructions.

If we submit a context to the ELSP which has previously been submitted,
move the tail pointer past the MI_NOOPs. This ensures HEAD!=TAIL.

v2: Move overallocation to gen8_emit_request, and added note about
sampling request->tail in commit message (Chris).

v3: Remove redundant request->tail assignment in __i915_add_request, in
lrc mode this is already set in execlists_context_queue.
Do not add wa implementation details inside gem (Chris).

v4: Apply the wa whenever the req has been resubmitted and update
comment (Chris).

Cc: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Thomas Daniel <thomas.daniel@intel.com>
Signed-off-by: Michel Thierry <michel.thierry@intel.com>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
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Raw File
ad1848.h 

#include <linux/interrupt.h>

#define AD_F_CS4231     0x0001  /* Returned if a CS4232 (or compatible) detected */
#define AD_F_CS4248     0x0001  /* Returned if a CS4248 (or compatible) detected */

#define         AD1848_SET_XTAL         1
#define         AD1848_MIXER_REROUTE    2

#define AD1848_REROUTE(oldctl, newctl) \
                ad1848_control(AD1848_MIXER_REROUTE, ((oldctl)<<8)|(newctl))
		

int ad1848_init(char *name, struct resource *ports, int irq, int dma_playback,
	int dma_capture, int share_dma, int *osp, struct module *owner);
void ad1848_unload (int io_base, int irq, int dma_playback, int dma_capture, int share_dma);

int ad1848_detect (struct resource *ports, int *flags, int *osp);
int ad1848_control(int cmd, int arg);

void attach_ms_sound(struct address_info * hw_config, struct resource *ports, struct module * owner);

int probe_ms_sound(struct address_info *hw_config, struct resource *ports);
void unload_ms_sound(struct address_info *hw_info);
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