@@ -186,6 +186,18 @@ static int mei_me_hw_reset(struct mei_device *dev, bool intr_enable)
dev->recvd_hw_ready = false;
mei_me_reg_write(hw, H_CSR, hcsr);
+ /*
+ * Host reads the H_CSR once to ensure that the
+ * posted write to H_CSR completes.
+ */
+ hcsr = mei_hcsr_read(hw);
+
+ if ((hcsr & H_RST) == 0)
+ dev_warn(&dev->pdev->dev, "H_RST is not set = 0x%08X", hcsr);
+
+ if ((hcsr & H_RDY) == H_RDY)
+ dev_warn(&dev->pdev->dev, "H_RDY is not cleared 0x%08X", hcsr);
+
if (dev->dev_state == MEI_DEV_POWER_DOWN)
mei_me_hw_reset_release(dev);
This is a note to let you know that I have just added a patch titled mei: me: read H_CSR after asserting reset to the linux-3.11.y-queue branch of the 3.11.y.z extended stable tree which can be found at: http://kernel.ubuntu.com/git?p=ubuntu/linux.git;a=shortlog;h=refs/heads/linux-3.11.y-queue If you, or anyone else, feels it should not be added to this tree, please reply to this email. For more information about the 3.11.y.z tree, see https://wiki.ubuntu.com/Kernel/Dev/ExtendedStable Thanks. -Luis ------ From e51c8c238e0755898a68dd0dd458ec7ad4a24aba Mon Sep 17 00:00:00 2001 From: Tomas Winkler <tomas.winkler@intel.com> Date: Mon, 12 May 2014 12:19:41 +0300 Subject: mei: me: read H_CSR after asserting reset commit c40765d919d25d2d44d99c4ce39e48808f137e1e upstream. According the spec the host should read H_CSR again after asserting reset H_RST to ensure that reset was read by the firmware 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> [ luis: backported to 3.11: adjusted context ] Signed-off-by: Luis Henriques <luis.henriques@canonical.com> --- drivers/misc/mei/hw-me.c | 12 ++++++++++++ 1 file changed, 12 insertions(+) -- 1.9.1