target/linux/layerscape/patches-5.4/806-dma-0012-MLK-17094-dma-fsl-edma-v3-add-suspend-resume-to-rest.patch

   1 From 411a2f6ad13bd58646de34a340553232044f0951 Mon Sep 17 00:00:00 2001
   2 From: Robin Gong <yibin.gong@nxp.com>
   3 Date: Mon, 4 Dec 2017 15:35:09 +0800
   4 Subject: [PATCH] MLK-17094 dma: fsl-edma-v3: add suspend/resume to restore
   5  back channel registers
   6
   7 Add suspend to save channel registers and resume to restore them back since
   8 edmav3 may powered off in suspend.
   9
  10 Signed-off-by: Robin Gong <yibin.gong@nxp.com>
  11 (cherry picked from commit 7eda1ae538ec7e7c0f993b3ea91805459f3dedd3)
  12 ---
  13  drivers/dma/fsl-edma-v3.c | 86 +++++++++++++++++++++++++++++++++++++++++++++++
  14  1 file changed, 86 insertions(+)
  15
  16 --- a/drivers/dma/fsl-edma-v3.c
  17 +++ b/drivers/dma/fsl-edma-v3.c
  18 @@ -111,6 +111,11 @@
  19  #define CHAN_PREFIX                    "edma0-chan"
  20  #define CHAN_POSFIX                    "-tx"
  21
  22 +enum fsl_edma3_pm_state {
  23 +       RUNNING = 0,
  24 +       SUSPENDED,
  25 +};
  26 +
  27  struct fsl_edma3_hw_tcd {
  28         __le32  saddr;
  29         __le16  soff;
  30 @@ -142,6 +147,8 @@ struct fsl_edma3_slave_config {
  31  struct fsl_edma3_chan {
  32         struct virt_dma_chan            vchan;
  33         enum dma_status                 status;
  34 +       enum fsl_edma3_pm_state         pm_state;
  35 +       bool                            idle;
  36         struct fsl_edma3_engine         *edma3;
  37         struct fsl_edma3_desc           *edesc;
  38         struct fsl_edma3_slave_config   fsc;
  39 @@ -165,11 +172,18 @@ struct fsl_edma3_desc {
  40         struct fsl_edma3_sw_tcd         tcd[];
  41  };
  42
  43 +struct fsl_edma3_reg_save {
  44 +       u32 csr;
  45 +       u32 sbr;
  46 +};
  47 +
  48  struct fsl_edma3_engine {
  49         struct dma_device       dma_dev;
  50         struct mutex            fsl_edma3_mutex;
  51         u32                     n_chans;
  52         int                     errirq;
  53 +       #define MAX_CHAN_NUM    32
  54 +       struct fsl_edma3_reg_save edma_regs[MAX_CHAN_NUM];
  55         bool                    swap;   /* remote/local swapped on Audio edma */
  56         struct fsl_edma3_chan   chans[];
  57  };
  58 @@ -266,6 +280,7 @@ static int fsl_edma3_terminate_all(struc
  59         spin_lock_irqsave(&fsl_chan->vchan.lock, flags);
  60         fsl_edma3_disable_request(fsl_chan);
  61         fsl_chan->edesc = NULL;
  62 +       fsl_chan->idle = true;
  63         vchan_get_all_descriptors(&fsl_chan->vchan, &head);
  64         spin_unlock_irqrestore(&fsl_chan->vchan.lock, flags);
  65         vchan_dma_desc_free_list(&fsl_chan->vchan, &head);
  66 @@ -281,6 +296,7 @@ static int fsl_edma3_pause(struct dma_ch
  67         if (fsl_chan->edesc) {
  68                 fsl_edma3_disable_request(fsl_chan);
  69                 fsl_chan->status = DMA_PAUSED;
  70 +               fsl_chan->idle = true;
  71         }
  72         spin_unlock_irqrestore(&fsl_chan->vchan.lock, flags);
  73         return 0;
  74 @@ -295,6 +311,7 @@ static int fsl_edma3_resume(struct dma_c
  75         if (fsl_chan->edesc) {
  76                 fsl_edma3_enable_request(fsl_chan);
  77                 fsl_chan->status = DMA_IN_PROGRESS;
  78 +               fsl_chan->idle = false;
  79         }
  80         spin_unlock_irqrestore(&fsl_chan->vchan.lock, flags);
  81         return 0;
  82 @@ -664,6 +681,7 @@ static void fsl_edma3_xfer_desc(struct f
  83         fsl_edma3_set_tcd_regs(fsl_chan, fsl_chan->edesc->tcd[0].vtcd);
  84         fsl_edma3_enable_request(fsl_chan);
  85         fsl_chan->status = DMA_IN_PROGRESS;
  86 +       fsl_chan->idle = false;
  87  }
  88
  89  static size_t fsl_edma3_desc_residue(struct fsl_edma3_chan *fsl_chan,
  90 @@ -700,6 +718,7 @@ static irqreturn_t fsl_edma3_tx_handler(
  91                 vchan_cookie_complete(&fsl_chan->edesc->vdesc);
  92                 fsl_chan->edesc = NULL;
  93                 fsl_chan->status = DMA_COMPLETE;
  94 +               fsl_chan->idle = true;
  95         } else {
  96                 vchan_cyclic_callback(&fsl_chan->edesc->vdesc);
  97         }
  98 @@ -719,6 +738,12 @@ static void fsl_edma3_issue_pending(stru
  99
 100         spin_lock_irqsave(&fsl_chan->vchan.lock, flags);
 101
 102 +       if (unlikely(fsl_chan->pm_state != RUNNING)) {
 103 +               spin_unlock_irqrestore(&fsl_chan->vchan.lock, flags);
 104 +               /* cannot submit due to suspend */
 105 +               return;
 106 +       }
 107 +
 108         if (vchan_issue_pending(&fsl_chan->vchan) && !fsl_chan->edesc)
 109                 fsl_edma3_xfer_desc(fsl_chan);
 110
 111 @@ -821,6 +846,8 @@ static int fsl_edma3_probe(struct platfo
 112                 unsigned long val;
 113
 114                 fsl_chan->edma3 = fsl_edma3;
 115 +               fsl_chan->pm_state = RUNNING;
 116 +               fsl_chan->idle = true;
 117                 /* Get per channel membase */
 118                 res = platform_get_resource(pdev, IORESOURCE_MEM, i);
 119                 fsl_chan->membase = devm_ioremap_resource(&pdev->dev, res);
 120 @@ -932,6 +959,64 @@ static int fsl_edma3_remove(struct platf
 121         return 0;
 122  }
 123
 124 +static int fsl_edma3_suspend_late(struct device *dev)
 125 +{
 126 +       struct fsl_edma3_engine *fsl_edma = dev_get_drvdata(dev);
 127 +       struct fsl_edma3_chan *fsl_chan;
 128 +       unsigned long flags;
 129 +       void __iomem *addr;
 130 +       int i;
 131 +
 132 +       for (i = 0; i < fsl_edma->n_chans; i++) {
 133 +               fsl_chan = &fsl_edma->chans[i];
 134 +               addr = fsl_chan->membase;
 135 +
 136 +               spin_lock_irqsave(&fsl_chan->vchan.lock, flags);
 137 +               fsl_edma->edma_regs[i].csr = readl(addr + EDMA_CH_CSR);
 138 +               fsl_edma->edma_regs[i].sbr = readl(addr + EDMA_CH_SBR);
 139 +               /* Make sure chan is idle or will force disable. */
 140 +               if (unlikely(!fsl_chan->idle)) {
 141 +                       dev_warn(dev, "WARN: There is non-idle channel.");
 142 +                       fsl_edma3_disable_request(fsl_chan);
 143 +               }
 144 +               fsl_chan->pm_state = SUSPENDED;
 145 +               spin_unlock_irqrestore(&fsl_chan->vchan.lock, flags);
 146 +       }
 147 +
 148 +       return 0;
 149 +}
 150 +
 151 +static int fsl_edma3_resume_early(struct device *dev)
 152 +{
 153 +       struct fsl_edma3_engine *fsl_edma = dev_get_drvdata(dev);
 154 +       struct fsl_edma3_chan *fsl_chan;
 155 +       void __iomem *addr;
 156 +       unsigned long flags;
 157 +       int i;
 158 +
 159 +       for (i = 0; i < fsl_edma->n_chans; i++) {
 160 +               fsl_chan = &fsl_edma->chans[i];
 161 +               addr = fsl_chan->membase;
 162 +
 163 +               spin_lock_irqsave(&fsl_chan->vchan.lock, flags);
 164 +               writel(fsl_edma->edma_regs[i].csr, addr + EDMA_CH_CSR);
 165 +               writel(fsl_edma->edma_regs[i].sbr, addr + EDMA_CH_SBR);
 166 +               /* restore tcd if this channel not terminated before suspend */
 167 +               if (fsl_chan->edesc)
 168 +                       fsl_edma3_set_tcd_regs(fsl_chan,
 169 +                                               fsl_chan->edesc->tcd[0].vtcd);
 170 +               fsl_chan->pm_state = RUNNING;
 171 +               spin_unlock_irqrestore(&fsl_chan->vchan.lock, flags);
 172 +       }
 173 +
 174 +       return 0;
 175 +}
 176 +
 177 +static const struct dev_pm_ops fsl_edma3_pm_ops = {
 178 +       .suspend_late   = fsl_edma3_suspend_late,
 179 +       .resume_early   = fsl_edma3_resume_early,
 180 +};
 181 +
 182  static const struct of_device_id fsl_edma3_dt_ids[] = {
 183         { .compatible = "fsl,imx8qm-edma", },
 184         { .compatible = "fsl,imx8qm-adma", },
 185 @@ -943,6 +1028,7 @@ static struct platform_driver fsl_edma3_
 186         .driver         = {
 187                 .name   = "fsl-edma-v3",
 188                 .of_match_table = fsl_edma3_dt_ids,
 189 +               .pm     = &fsl_edma3_pm_ops,
 190         },
 191         .probe          = fsl_edma3_probe,
 192         .remove         = fsl_edma3_remove,