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ahci_xgene: Skip the PHY and clock initialization if already configured by the firmware.

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This patch implements the feature to skip the PHY and clock
initialization if it is already configured by the firmware.

Signed-off-by: Loc Ho <lho@apm.com>
Signed-off-by: Suman Tripathi <stripathi@apm.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
This commit is contained in:
Suman Tripathi 2014-08-28 14:51:21 +05:30 committed by Tejun Heo
parent c5edfff9db
commit 0bed13bebd
1 changed files with 14 additions and 1 deletions
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15
drivers/ata/ahci_xgene.c
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@ -145,6 +145,14 @@ static unsigned int xgene_ahci_qc_issue(struct ata_queued_cmd *qc)
return rc;
}
static bool xgene_ahci_is_memram_inited(struct xgene_ahci_context *ctx)
{
void __iomem *diagcsr = ctx->csr_diag;
return (readl(diagcsr + CFG_MEM_RAM_SHUTDOWN) == 0 &&
readl(diagcsr + BLOCK_MEM_RDY) == 0xFFFFFFFF);
}
/**
* xgene_ahci_read_id - Read ID data from the specified device
* @dev: device
@ -467,6 +475,11 @@ static int xgene_ahci_probe(struct platform_device *pdev)
return -ENODEV;
}
if (xgene_ahci_is_memram_inited(ctx)) {
dev_info(dev, "skip clock and PHY initialization\n");
goto skip_clk_phy;
}
/* Due to errata, HW requires full toggle transition */
rc = ahci_platform_enable_clks(hpriv);
if (rc)
@ -479,7 +492,7 @@ static int xgene_ahci_probe(struct platform_device *pdev)
/* Configure the host controller */
xgene_ahci_hw_init(hpriv);
skip_clk_phy:
hpriv->flags = AHCI_HFLAG_NO_PMP | AHCI_HFLAG_NO_NCQ;
rc = ahci_platform_init_host(pdev, hpriv, &xgene_ahci_port_info);