linux-kernel - [PATCH 4.9 159/206] PCI: rockchip: Correct the use of FTS mask

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Date:   Tue, 10 Jan 2017 14:37:22 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Brian Norris <briannorris@...omium.org>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Shawn Lin <shawn.lin@...k-chips.com>
Subject: [PATCH 4.9 159/206] PCI: rockchip: Correct the use of FTS mask

4.9-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Brian Norris <briannorris@...omium.org>

commit a45e2611b9bbd81288d97d02ce7e74a60a698d43 upstream.

We're trying to mask out bits[23:8] while retaining [32:24, 7:0], but we're
doing the inverse.  That doesn't have too much effect, since we're setting
all the [23:8] bits to 1, and the other bits are only relevant for modes
we're currently not using.  But we should get this right.

Fixes: ca1989084054 ("PCI: rockchip: Fix wrong transmitted FTS count")
Signed-off-by: Brian Norris <briannorris@...omium.org>
Signed-off-by: Bjorn Helgaas <bhelgaas@...gle.com>
Acked-by: Shawn Lin <shawn.lin@...k-chips.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/pci/host/pcie-rockchip.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/pci/host/pcie-rockchip.c
+++ b/drivers/pci/host/pcie-rockchip.c
@@ -533,7 +533,7 @@ static int rockchip_pcie_init_port(struc
 
 	/* Fix the transmitted FTS count desired to exit from L0s. */
 	status = rockchip_pcie_read(rockchip, PCIE_CORE_CTRL_PLC1);
-	status = (status & PCIE_CORE_CTRL_PLC1_FTS_MASK) |
+	status = (status & ~PCIE_CORE_CTRL_PLC1_FTS_MASK) |
 		 (PCIE_CORE_CTRL_PLC1_FTS_CNT << PCIE_CORE_CTRL_PLC1_FTS_SHIFT);
 	rockchip_pcie_write(rockchip, status, PCIE_CORE_CTRL_PLC1);