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@xxxxxxx>
Signed-off-by: Suman Tripathi <stripathi@xxxxxxx>
---
drivers/ata/ahci_xgene.c | 15 +++++++++++++++
1 file changed, 15 insertions(+)
diff --git a/drivers/ata/ahci_xgene.c b/drivers/ata/ahci_xgene.c
index f416495..c721887 100644
--- a/drivers/ata/ahci_xgene.c
+++ b/drivers/ata/ahci_xgene.c
@@ -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
@@ -468,6 +476,11 @@ 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)
@@ -481,6 +494,8 @@ static int xgene_ahci_probe(struct platform_device *pdev)
/* Configure the host controller */
xgene_ahci_hw_init(hpriv);
+skip_clk_phy:
+
hflags = AHCI_HFLAG_NO_PMP | AHCI_HFLAG_NO_NCQ;
rc = ahci_platform_init_host(pdev, hpriv, &xgene_ahci_port_info,
--
1.8.2.1
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