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Date: Tue, 27 Jan 2015 12:16:49 +0000 From: Luis Henriques <luis.henriques@...onical.com> To: linux-kernel@...r.kernel.org, stable@...r.kernel.org, kernel-team@...ts.ubuntu.com Cc: Alexander Usyskin <alexander.usyskin@...el.com>, Tomas Winkler <tomas.winkler@...el.com>, Greg Kroah-Hartman <gregkh@...uxfoundation.org>, Luis Henriques <luis.henriques@...onical.com> Subject: [PATCH 3.16.y-ckt 104/126] mei: clean reset bit before reset 3.16.7-ckt5 -stable review patch. If anyone has any objections, please let me know. ------------------ From: Alexander Usyskin <alexander.usyskin@...el.com> commit b13a65ef190e488e2761d65bdd2e1fe8a3a125f5 upstream. H_RST bit in H_CSR register may be found lit before reset is started, for example if preceding reset flow hasn't completed. In that case asserting H_RST will be ignored, therefore we need to clean H_RST bit to start a successful reset sequence. Signed-off-by: Alexander Usyskin <alexander.usyskin@...el.com> Signed-off-by: Tomas Winkler <tomas.winkler@...el.com> Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org> [ luis: backported to 3.16: - replace dev->dev by &dev->pdev->dev ] Signed-off-by: Luis Henriques <luis.henriques@...onical.com> --- drivers/misc/mei/hw-me.c | 12 ++++++++++++ 1 file changed, 12 insertions(+) diff --git a/drivers/misc/mei/hw-me.c b/drivers/misc/mei/hw-me.c index 6a2d272cea43..9d0cd32d885a 100644 --- a/drivers/misc/mei/hw-me.c +++ b/drivers/misc/mei/hw-me.c @@ -196,6 +196,18 @@ static int mei_me_hw_reset(struct mei_device *dev, bool intr_enable) struct mei_me_hw *hw = to_me_hw(dev); u32 hcsr = mei_hcsr_read(hw); + /* H_RST may be found lit before reset is started, + * for example if preceding reset flow hasn't completed. + * In that case asserting H_RST will be ignored, therefore + * we need to clean H_RST bit to start a successful reset sequence. + */ + if ((hcsr & H_RST) == H_RST) { + dev_warn(&dev->pdev->dev, "H_RST is set = 0x%08X", hcsr); + hcsr &= ~H_RST; + mei_me_reg_write(hw, H_CSR, hcsr); + hcsr = mei_hcsr_read(hw); + } + hcsr |= H_RST | H_IG | H_IS; if (intr_enable) -- 2.1.4 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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