diff options
| author | Tomas Winkler <tomas.winkler@intel.com> | 2014-03-19 00:51:58 +0400 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2014-05-04 03:20:23 +0400 |
| commit | ee7e5afd2c369b64ffcf419d38ce7ad1c709a53e (patch) | |
| tree | b61d3eea96f2fee5ab8209c44a41dced1e023a60 /drivers/misc/mei/hw-me.c | |
| parent | b16c35716b843acdbe562bc0068580c50db203ff (diff) | |
| download | linux-ee7e5afd2c369b64ffcf419d38ce7ad1c709a53e.tar.xz | |
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.c | 37 |
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, |