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Wysocki" , Inki Dae Subject: [PATCH v3 3/4] dmaengine: pl330: Store pointer to slave device Date: Tue, 10 Jan 2017 08:12:38 +0100 Message-id: <1484032359-8311-4-git-send-email-m.szyprowski@samsung.com> X-Mailer: git-send-email 1.9.1 In-reply-to: <1484032359-8311-1-git-send-email-m.szyprowski@samsung.com> X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFnrMIsWRmVeSWpSXmKPExsWy7djPc7orOksiDNYfEbfYOGM9q8XqqX9Z LSbdn8Bicf78BnaLTY+vsVp87j3CaDHj/D4mi7VH7rJbnDl9idXi+Npwi5d9+1kcuD0W73nJ 5LFpVSebx51re9g8Ni+p99hytZ3Fo2/LKkaPz5vkAtijuGxSUnMyy1KL9O0SuDI27t7PWnCY q+L2hAOMDYw3OboYOTkkBEwkGl60skPYYhIX7q1n62Lk4hASWMoo0fbhGDuE85lR4n3PUTaY jm3t56ASyxglrm2eywSSEBJoYJLonMgDYrMJGEp0ve0CGyUi0MQo8Xb+ckYQh1lgKZPE5vaX YAuFBdwl9j+cwQhiswioSmxq+wq2ghco3v5sOyPEOjmJk8cms4LYnAIeEu++HYE6Yx67xPWf QE9wANmyEpsOMEOEXSRe32uDsoUlXh3fAvWbjERnx0EmCLufUaKpVRvCnsEoce4tL4RtLXH4 +EWwVcwCfBKTtk1nhhjPK9HRJgRhekjs2RENYTpKHF8oDQmG2YwSu558ZJ7AKLOAkWEVo0hq aXFuemqxkV5xYm5xaV66XnJ+7iZGYNSf/nf84w7G9yesDjEKcDAq8fBGTCiOEGJNLCuuzD3E KMHBrCTCK9BaEiHEm5JYWZValB9fVJqTWnyIUZqDRUmcd8+CK+FCAumJJanZqakFqUUwWSYO TqkGxstp+ZYLbEu2BXjVJv1JXfJQp1xJOU67fQX/v00L4zhydCwyP2lXucdvX5mWZnv5xAnb yU9UH+++UqwT1F3vILDgZKaDqvcZp2sViw8ddjrGqfXJ05j5VbWG149DL8tD/200PLfDc/EG +9cfwx5r3d5raOP7V+/+MeM/3KcnmS2ZFXRtvnDodyWW4oxEQy3mouJEAH5hLAf2AgAA X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFmpjkeLIzCtJLcpLzFFi42I5/e/4Vd1bnSURBk++mllsnLGe1WL11L+s FpPuT2CxOH9+A7vFpsfXWC0+9x5htJhxfh+Txdojd9ktzpy+xGpxfG24xcu+/SwO3B6L97xk 8ti0qpPN4861PWwem5fUe2y52s7i0bdlFaPH501yAexRbjYZqYkpqUUKqXnJ+SmZeem2SqEh broWSgp5ibmptkoRur4hQUoKZYk5pUCekQEacHAOcA9W0rdLcMvYuHs/a8FhrorbEw4wNjDe 5Ohi5OSQEDCR2NZ+jh3CFpO4cG89WxcjF4eQwBJGicdTVzJBOE1MEjM3b2cBqWITMJToetvF BmKLCDQxShz85QFSxCywnEliy/QLYKOEBdwl9j+cwQhiswioSmxq+wrWwAsUb3+2nRFinZzE yWOTWUFsTgEPiXffjoDVCAHVzPr1m20CI+8CRoZVjCKppcW56bnFhnrFibnFpXnpesn5uZsY gXGw7djPzTsYL20MPsQowMGoxMO7YVJxhBBrYllxZe4hRgkOZiURXoHWkggh3pTEyqrUovz4 otKc1OJDjKZAR01klhJNzgfGaF5JvKGJobmloZGxhYW5kZGSOG/JhyvhQgLpiSWp2ampBalF MH1MHJxSDYwuP8ViYnk2SH3L7Dqrv62j13apctPNxTfLyl//PHQyxX3Lgpfm6gxNRTkKDQlG t+ZXV/rwrWtjrzA+eeTN1F0iHxJL1Gc8e3pDVWL/+p6/3K9MJNe++Lf9uM2Uzxn9EtOXPf4d 3B96aUZwyB7z2istBSKRwfIS81/cu6z87YzRHA8r5Tc75x1RYinOSDTUYi4qTgQAa8hvw5kC AAA= X-MTR: 20000000000000000@CPGS X-CMS-MailID: 20170110071343eucas1p1b3f8c5122f2d2259e95353a98fdd9484 X-Msg-Generator: CA X-Sender-IP: 182.198.249.179 X-Local-Sender: =?UTF-8?B?TWFyZWsgU3p5cHJvd3NraRtTUlBPTC1LZXJuZWwgKFRQKRs=?= =?UTF-8?B?7IK87ISx7KCE7J6QG1NlbmlvciBTb2Z0d2FyZSBFbmdpbmVlcg==?= X-Global-Sender: =?UTF-8?B?TWFyZWsgU3p5cHJvd3NraRtTUlBPTC1LZXJuZWwgKFRQKRtT?= =?UTF-8?B?YW1zdW5nIEVsZWN0cm9uaWNzG1NlbmlvciBTb2Z0d2FyZSBFbmdpbmVlcg==?= X-Sender-Code: =?UTF-8?B?QzEwG0VIURtDMTBDRDAyQ0QwMjczOTI=?= CMS-TYPE: 201P X-HopCount: 7 X-CMS-RootMailID: 20170110071343eucas1p1b3f8c5122f2d2259e95353a98fdd9484 X-RootMTR: 20170110071343eucas1p1b3f8c5122f2d2259e95353a98fdd9484 References: <1484032359-8311-1-git-send-email-m.szyprowski@samsung.com> Sender: linux-pm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-pm@vger.kernel.org Store the pointer to slave device, which requested our channel. It will be later used to implement runtime PM of PL330 DMA controller. Although DMA channels might be requested many times, each DMA peripheral channel is physically dedicated only for specific hardware, so there should be only one slave device for each channel. Signed-off-by: Marek Szyprowski Reviewed-by: Krzysztof Kozlowski --- drivers/dma/pl330.c | 9 +++++++++ 1 file changed, 9 insertions(+) -- 1.9.1 -- To unsubscribe from this list: send the line "unsubscribe linux-pm" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html diff --git a/drivers/dma/pl330.c b/drivers/dma/pl330.c index d7670e7220e4..4489d4d13012 100644 --- a/drivers/dma/pl330.c +++ b/drivers/dma/pl330.c @@ -450,6 +450,7 @@ struct dma_pl330_chan { /* for runtime pm tracking */ bool active; + struct device *slave; }; struct pl330_dmac { @@ -2101,6 +2102,14 @@ static struct dma_chan *of_dma_pl330_xlate(struct of_phandle_args *dma_spec, if (chan_id >= pl330->num_peripherals) return NULL; + if (!pl330->peripherals[chan_id].slave) { + pl330->peripherals[chan_id].slave = slave; + } else if (pl330->peripherals[chan_id].slave != slave) { + dev_err(pl330->ddma.dev, + "Can't use same channel with multiple slave devices!\n"); + return NULL; + } + return dma_get_slave_channel(&pl330->peripherals[chan_id].chan); }