[PATCH v7 2/3] ahci_xgene: Skip the PHY and clock initialization if already configured by the firmware.
From: Suman Tripathi <hidden>
Date: 2014-08-19 06:31:50
Also in:
linux-ide, linux-scsi
Subsystem:
libata subsystem (serial and parallel ata drivers), the rest · Maintainers:
Damien Le Moal, Niklas Cassel, Linus Torvalds
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 <redacted> Signed-off-by: Suman Tripathi <redacted> --- drivers/ata/ahci_xgene.c | 17 +++++++++++++++++ 1 file changed, 17 insertions(+)
diff --git a/drivers/ata/ahci_xgene.c b/drivers/ata/ahci_xgene.c
index f416495..0a87f2e 100644
--- a/drivers/ata/ahci_xgene.c
+++ b/drivers/ata/ahci_xgene.c@@ -145,6 +145,16 @@ static unsigned int xgene_ahci_qc_issue(struct ata_queued_cmd *qc) return rc; } +static int xgene_ahci_is_memram_inited(struct xgene_ahci_context *ctx) +{ + void __iomem *diagcsr = ctx->csr_diag; + + if (readl(diagcsr + CFG_MEM_RAM_SHUTDOWN) == 0 && + readl(diagcsr + BLOCK_MEM_RDY) == 0xFFFFFFFF) + return 1; + return 0; +} + /** * xgene_ahci_read_id - Read ID data from the specified device * @dev: device
@@ -468,6 +478,11 @@ 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 +496,8 @@ 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