From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: From: Sasha Levin To: "linux-kernel@vger.kernel.org" , "stable@vger.kernel.org" CC: Vignesh R , Peter Ujfalusi , Vinod Koul , Sasha Levin Subject: [PATCH AUTOSEL for 4.4 101/101] dmaengine: ti-dma-crossbar: Fix event mapping for TPCC_EVT_MUX_60_63 Date: Thu, 8 Mar 2018 05:02:17 +0000 Message-ID: <20180308050023.8548-101-alexander.levin@microsoft.com> References: <20180308050023.8548-1-alexander.levin@microsoft.com> In-Reply-To: <20180308050023.8548-1-alexander.levin@microsoft.com> Content-Language: en-US Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 Sender: linux-kernel-owner@vger.kernel.org List-ID: From: Vignesh R [ Upstream commit d087f15786021a9605b20f4c678312510be4cac1 ] Register layout of a typical TPCC_EVT_MUX_M_N register is such that the lowest numbered event is at the lowest byte address and highest numbered event at highest byte address. But TPCC_EVT_MUX_60_63 register layout is different, in that the lowest numbered event is at the highest address and highest numbered event is at the lowest address. Therefore, modify ti_am335x_xbar_write() to handle TPCC_EVT_MUX_60_63 register accordingly. Signed-off-by: Vignesh R Signed-off-by: Peter Ujfalusi Signed-off-by: Vinod Koul Signed-off-by: Sasha Levin --- drivers/dma/ti-dma-crossbar.c | 10 +++++++++- 1 file changed, 9 insertions(+), 1 deletion(-) diff --git a/drivers/dma/ti-dma-crossbar.c b/drivers/dma/ti-dma-crossbar.c index 8100ede095d5..c7bd1c5315f4 100644 --- a/drivers/dma/ti-dma-crossbar.c +++ b/drivers/dma/ti-dma-crossbar.c @@ -51,7 +51,15 @@ struct ti_am335x_xbar_map { =20 static inline void ti_am335x_xbar_write(void __iomem *iomem, int event, u8= val) { - writeb_relaxed(val, iomem + event); + /* + * TPCC_EVT_MUX_60_63 register layout is different than the + * rest, in the sense, that event 63 is mapped to lowest byte + * and event 60 is mapped to highest, handle it separately. + */ + if (event >=3D 60 && event <=3D 63) + writeb_relaxed(val, iomem + (63 - event % 4)); + else + writeb_relaxed(val, iomem + event); } =20 static void ti_am335x_xbar_free(struct device *dev, void *route_data) --=20 2.14.1