drm/i915: Speed up DMC firmware loading

Currently we're doing:

1. acquire lock
2. write word to hardware
3. release lock
4. repeat from 1

to load the DMC firmware. Due to the cost of acquiring/releasing a lock,
and the size of the DMC firmware, this slows down DMC loading a lot.

This patch simply acquires the lock, writes the entire firmware,
then releases the lock. Testing shows resume speedups
in the order of 10ms on platforms with DMC firmware (GEN9+).

v2: Per feedback from Chris & Ville there's no need to do the whole
forcewake dance, so lose that bit (Chris, Ville)

v3: Actually send the new version of the patch...

v4: Don't acquire the uncore lock. Disable preempt. (Chris)

Signed-off-by: David Weinehall <[e-mail]>
Link: https://patchwork.freedesktop.org/patch/msgid/[e-mail]
Reviewed-by: Chris Wilson <[e-mail]>
Signed-off-by: Chris Wilson <[e-mail]>

drivers/gpu/drm/i915/intel_csr.c

···
 	}
 
 	fw_size = dev_priv->csr.dmc_fw_size;
+	assert_rpm_wakelock_held(dev_priv);
+
+	preempt_disable();
+
 	for (i = 0; i < fw_size; i++)
-		I915_WRITE(CSR_PROGRAM(i), payload[i]);
+		I915_WRITE_FW(CSR_PROGRAM(i), payload[i]);
+
+	preempt_enable();
 
 	for (i = 0; i < dev_priv->csr.mmio_count; i++) {
 		I915_WRITE(dev_priv->csr.mmioaddr[i],