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authorSuman Tripathi <stripathi@apm.com>2014-08-28 13:21:21 +0400
committerTejun Heo <tj@kernel.org>2014-09-06 06:27:14 +0400
commit0bed13bebd6c99d097796d2ca6c4f10fb5b2eabc (patch)
tree461e7ed7cfc5e7d32c5c76f6fad5218cdc01fd3f
parentc5edfff9db6f4d2c35c802acb4abe0df178becee (diff)
downloadlinux-0bed13bebd6c99d097796d2ca6c4f10fb5b2eabc.tar.xz
ahci_xgene: Skip the PHY and clock initialization if already configured by the firmware.
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>
-rw-r--r--drivers/ata/ahci_xgene.c15
1 files changed, 14 insertions, 1 deletions
diff --git a/drivers/ata/ahci_xgene.c b/drivers/ata/ahci_xgene.c
index c6962300b93c..37501fd0973d 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
@@ -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);