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Commit f2cbe46f authored by Ben Skeggs's avatar Ben Skeggs
Browse files

drm/nouveau: determine timing crystal freq from straps 



Signed-off-by: default avatarBen Skeggs <bskeggs@redhat.com>
parent 93e692dc

drivers/gpu/drm/nouveau/nouveau_drv.h

+1 −0
Original line number Diff line number Diff line
@@ -680,6 +680,7 @@ struct drm_nouveau_private { 
	/* exact chipset, derived from NV_PMC_BOOT_0 */

	int chipset;

	int flags;

	u32 crystal;



	void __iomem *mmio;

drivers/gpu/drm/nouveau/nouveau_state.c

+18 −1
Original line number Diff line number Diff line
@@ -984,7 +984,7 @@ static int nouveau_remove_conflicting_drivers(struct drm_device *dev) 
int nouveau_load(struct drm_device *dev, unsigned long flags)

{

	struct drm_nouveau_private *dev_priv;

	uint32_t reg0;

	uint32_t reg0, strap;

	resource_size_t mmio_start_offs;

	int ret;
@@ -1074,6 +1074,23 @@ int nouveau_load(struct drm_device *dev, unsigned long flags) 
	NV_INFO(dev, "Detected an NV%2x generation card (0x%08x)\n",

		dev_priv->card_type, reg0);



	/* determine frequency of timing crystal */

	strap = nv_rd32(dev, 0x101000);

	if ( dev_priv->chipset < 0x17 ||

	    (dev_priv->chipset >= 0x20 && dev_priv->chipset <= 0x25))

		strap &= 0x00000040;

	else

		strap &= 0x00400040;



	switch (strap) {

	case 0x00000000: dev_priv->crystal = 13500; break;

	case 0x00000040: dev_priv->crystal = 14318; break;

	case 0x00400000: dev_priv->crystal = 27000; break;

	case 0x00400040: dev_priv->crystal = 25000; break;

	}



	NV_DEBUG(dev, "crystal freq: %dKHz\n", dev_priv->crystal);



	/* Determine whether we'll attempt acceleration or not, some

	 * cards are disabled by default here due to them being known

	 * non-functional, or never been tested due to lack of hw.