From: Tomas Winkler Date: Mon, 12 May 2014 09:19:41 +0000 (+0300) Subject: mei: me: read H_CSR after asserting reset X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=c40765d919d25d2d44d99c4ce39e48808f137e1e;p=GitHub%2Fexynos8895%2Fandroid_kernel_samsung_universal8895.git mei: me: read H_CSR after asserting reset According the spec the host should read H_CSR again after asserting reset H_RST to ensure that reset was read by the firmware Cc: stable@vger.kernel.org Signed-off-by: Tomas Winkler Signed-off-by: Alexander Usyskin Signed-off-by: Greg Kroah-Hartman --- diff --git a/drivers/misc/mei/hw-me.c b/drivers/misc/mei/hw-me.c index 031efcfed39e..016ad88a2887 100644 --- a/drivers/misc/mei/hw-me.c +++ b/drivers/misc/mei/hw-me.c @@ -206,6 +206,18 @@ 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 (intr_enable == false) mei_me_hw_reset_release(dev);