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nvme: Respect timeout when en/disabling the controller
So far the driver unconditionally delays 10ms when en/disabling the controller and still return 0 if 10ms times out. In fact, spec defines a timeout value in the CAP register that is the worst case time that host software shall wait for the controller to become ready. Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
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04d2a38401
1 changed files with 11 additions and 3 deletions
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@ -47,11 +47,19 @@ struct nvme_queue {
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static int nvme_wait_ready(struct nvme_dev *dev, bool enabled)
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{
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u32 bit = enabled ? NVME_CSTS_RDY : 0;
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int timeout;
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ulong start;
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while ((readl(&dev->bar->csts) & NVME_CSTS_RDY) != bit)
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udelay(10000);
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/* Timeout field in the CAP register is in 500 millisecond units */
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timeout = NVME_CAP_TIMEOUT(dev->cap) * 500;
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return 0;
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start = get_timer(0);
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while (get_timer(start) < timeout) {
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if ((readl(&dev->bar->csts) & NVME_CSTS_RDY) == bit)
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return 0;
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}
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return -ETIME;
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}
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static int nvme_setup_prps(struct nvme_dev *dev, u64 *prp2,
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