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authorTomas Winkler <tomas.winkler@intel.com>2014-03-18 22:51:58 +0200
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2014-05-03 19:20:23 -0400
commitee7e5afd2c369b64ffcf419d38ce7ad1c709a53e (patch)
treeb61d3eea96f2fee5ab8209c44a41dced1e023a60 /drivers/misc/mei/hw-me.c
parentb16c35716b843acdbe562bc0068580c50db203ff (diff)
downloadlinux-ee7e5afd2c369b64ffcf419d38ce7ad1c709a53e.tar.bz2
mei: condition PGI support on HW and HBM version
Enable power gating isolation only if hw and fw support it. This is indicated by ME_PGIC_HRA bit in ME_CSR_HA register and on HBM protocol version. The information is exported to MEI layer through new pg_is_enabled hw op. Signed-off-by: Tomas Winkler <tomas.winkler@intel.com> Signed-off-by: Alexander Usyskin <alexander.usyskin@intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/misc/mei/hw-me.c')
-rw-r--r--drivers/misc/mei/hw-me.c37
1 files changed, 37 insertions, 0 deletions
diff --git a/drivers/misc/mei/hw-me.c b/drivers/misc/mei/hw-me.c
index fc5d001983b3..7a7e66250dfd 100644
--- a/drivers/misc/mei/hw-me.c
+++ b/drivers/misc/mei/hw-me.c
@@ -460,6 +460,41 @@ static void mei_me_pg_exit(struct mei_device *dev)
}
/**
+ * mei_me_pg_is_enabled - detect if PG is supported by HW
+ *
+ * @dev: the device structure
+ *
+ * returns: true is pg supported, false otherwise
+ */
+static bool mei_me_pg_is_enabled(struct mei_device *dev)
+{
+ struct mei_me_hw *hw = to_me_hw(dev);
+ u32 reg = mei_me_reg_read(hw, ME_CSR_HA);
+
+ if ((reg & ME_PGIC_HRA) == 0)
+ goto notsupported;
+
+ if (dev->version.major_version < HBM_MAJOR_VERSION_PGI)
+ goto notsupported;
+
+ if (dev->version.major_version == HBM_MAJOR_VERSION_PGI &&
+ dev->version.minor_version < HBM_MINOR_VERSION_PGI)
+ goto notsupported;
+
+ return true;
+
+notsupported:
+ dev_dbg(&dev->pdev->dev, "pg: not supported: HGP = %d hbm version %d.%d ?= %d.%d\n",
+ !!(reg & ME_PGIC_HRA),
+ dev->version.major_version,
+ dev->version.minor_version,
+ HBM_MAJOR_VERSION_PGI,
+ HBM_MINOR_VERSION_PGI);
+
+ return false;
+}
+
+/**
* mei_me_irq_quick_handler - The ISR of the MEI device
*
* @irq: The irq number
@@ -573,6 +608,8 @@ static const struct mei_hw_ops mei_me_hw_ops = {
.hw_config = mei_me_hw_config,
.hw_start = mei_me_hw_start,
+ .pg_is_enabled = mei_me_pg_is_enabled,
+
.intr_clear = mei_me_intr_clear,
.intr_enable = mei_me_intr_enable,
.intr_disable = mei_me_intr_disable,