mirror of https://gitee.com/openkylin/linux.git
52 lines
1.4 KiB
C
52 lines
1.4 KiB
C
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#include "drmP.h"
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#include "drm.h"
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#include "nouveau_drv.h"
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#include "nouveau_drm.h"
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int
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nv04_timer_init(struct drm_device *dev)
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{
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nv_wr32(dev, NV04_PTIMER_INTR_EN_0, 0x00000000);
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nv_wr32(dev, NV04_PTIMER_INTR_0, 0xFFFFFFFF);
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/* Just use the pre-existing values when possible for now; these regs
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* are not written in nv (driver writer missed a /4 on the address), and
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* writing 8 and 3 to the correct regs breaks the timings on the LVDS
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* hardware sequencing microcode.
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* A correct solution (involving calculations with the GPU PLL) can
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* be done when kernel modesetting lands
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*/
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if (!nv_rd32(dev, NV04_PTIMER_NUMERATOR) ||
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!nv_rd32(dev, NV04_PTIMER_DENOMINATOR)) {
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nv_wr32(dev, NV04_PTIMER_NUMERATOR, 0x00000008);
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nv_wr32(dev, NV04_PTIMER_DENOMINATOR, 0x00000003);
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}
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return 0;
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}
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uint64_t
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nv04_timer_read(struct drm_device *dev)
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{
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uint32_t low;
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/* From kmmio dumps on nv28 this looks like how the blob does this.
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* It reads the high dword twice, before and after.
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* The only explanation seems to be that the 64-bit timer counter
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* advances between high and low dword reads and may corrupt the
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* result. Not confirmed.
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*/
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uint32_t high2 = nv_rd32(dev, NV04_PTIMER_TIME_1);
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uint32_t high1;
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do {
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high1 = high2;
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low = nv_rd32(dev, NV04_PTIMER_TIME_0);
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high2 = nv_rd32(dev, NV04_PTIMER_TIME_1);
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} while (high1 != high2);
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return (((uint64_t)high2) << 32) | (uint64_t)low;
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}
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void
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nv04_timer_takedown(struct drm_device *dev)
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{
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}
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