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=83a03fda3d14ba6c097f0f4cdd86a8b9d9ed633a;p=GitHub%2Fmt8127%2Fandroid_kernel_alcatel_ttab.git 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 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 06311c5ada36..b9ce24378876 100644 --- a/drivers/misc/mei/hw-me.c +++ b/drivers/misc/mei/hw-me.c @@ -186,7 +186,19 @@ static void mei_me_hw_reset(struct mei_device *dev, bool intr_enable) dev->recvd_hw_ready = false; mei_me_reg_write(hw, H_CSR, hcsr); - if (dev->dev_state == MEI_DEV_POWER_DOWN) + /* + * 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); dev_dbg(&dev->pdev->dev, "current HCSR = 0x%08x.\n", mei_hcsr_read(hw));