target/linux/ipq806x/patches-4.4/710-spi-qup-Make-sure-mode-is-only-determined-once.patch

   1 From 93f99afbc534e00d72d58336061823055ee820f1 Mon Sep 17 00:00:00 2001
   2 From: Andy Gross <andy.gross@linaro.org>
   3 Date: Tue, 12 Apr 2016 09:11:47 -0500
   4 Subject: [PATCH] spi: qup: Make sure mode is only determined once
   5
   6 This patch calculates the mode once.  All decisions on the current
   7 transaction
   8 is made using the mode instead of use_dma
   9
  10 Signed-off-by: Andy Gross <andy.gross@linaro.org>
  11
  12 Change-Id: If3cdd924355e037d77dc8201a72895fac0461aa5
  13 ---
  14  drivers/spi/spi-qup.c | 96 +++++++++++++++++++--------------------------------
  15  1 file changed, 36 insertions(+), 60 deletions(-)
  16
  17 diff --git a/drivers/spi/spi-qup.c b/drivers/spi/spi-qup.c
  18 index eb2cb8c..714fd4e 100644
  19 --- a/drivers/spi/spi-qup.c
  20 +++ b/drivers/spi/spi-qup.c
  21 @@ -150,13 +150,20 @@ struct spi_qup {
  22         int                     rx_bytes;
  23         int                     qup_v1;
  24
  25 -       int                     use_dma;
  26 +       int                     mode;
  27         struct dma_slave_config rx_conf;
  28         struct dma_slave_config tx_conf;
  29 -       int mode;
  30  };
  31
  32
  33 +static inline bool spi_qup_is_dma_xfer(int mode)
  34 +{
  35 +       if (mode == QUP_IO_M_MODE_DMOV || mode == QUP_IO_M_MODE_BAM)
  36 +               return true;
  37 +
  38 +       return false;
  39 +}
  40 +
  41  static inline bool spi_qup_is_valid_state(struct spi_qup *controller)
  42  {
  43         u32 opstate = readl_relaxed(controller->base + QUP_STATE);
  44 @@ -427,7 +434,7 @@ static irqreturn_t spi_qup_qup_irq(int irq, void *dev_id)
  45                 error = -EIO;
  46         }
  47
  48 -       if (!controller->use_dma) {
  49 +       if (!spi_qup_is_dma_xfer(controller->mode)) {
  50                 if (opflags & QUP_OP_IN_SERVICE_FLAG)
  51                         spi_qup_fifo_read(controller, xfer);
  52
  53 @@ -446,43 +453,11 @@ static irqreturn_t spi_qup_qup_irq(int irq, void *dev_id)
  54         return IRQ_HANDLED;
  55  }
  56
  57 -static u32
  58 -spi_qup_get_mode(struct spi_master *master, struct spi_transfer *xfer)
  59 -{
  60 -       struct spi_qup *qup = spi_master_get_devdata(master);
  61 -       u32 mode;
  62 -       size_t dma_align = dma_get_cache_alignment();
  63 -
  64 -       qup->w_size = 4;
  65 -
  66 -       if (xfer->bits_per_word <= 8)
  67 -               qup->w_size = 1;
  68 -       else if (xfer->bits_per_word <= 16)
  69 -               qup->w_size = 2;
  70 -
  71 -       qup->n_words = xfer->len / qup->w_size;
  72 -
  73 -       if (!IS_ERR_OR_NULL(master->dma_rx) &&
  74 -                       IS_ALIGNED((size_t)xfer->tx_buf, dma_align) &&
  75 -                       IS_ALIGNED((size_t)xfer->rx_buf, dma_align) &&
  76 -                       !is_vmalloc_addr(xfer->tx_buf) &&
  77 -                       !is_vmalloc_addr(xfer->rx_buf) &&
  78 -                       (xfer->len > 3*qup->in_blk_sz))
  79 -               qup->use_dma = 1;
  80 -
  81 -       if (qup->n_words <= (qup->in_fifo_sz / sizeof(u32)))
  82 -               mode = QUP_IO_M_MODE_FIFO;
  83 -       else
  84 -               mode = QUP_IO_M_MODE_BLOCK;
  85 -
  86 -       return mode;
  87 -}
  88 -
  89  /* set clock freq ... bits per word */
  90  static int spi_qup_io_config(struct spi_device *spi, struct spi_transfer *xfer)
  91  {
  92         struct spi_qup *controller = spi_master_get_devdata(spi->master);
  93 -       u32 config, iomode, mode, control;
  94 +       u32 config, iomode, control;
  95         int ret, n_words;
  96
  97         if (spi->mode & SPI_LOOP && xfer->len > controller->in_fifo_sz) {
  98 @@ -503,24 +478,22 @@ static int spi_qup_io_config(struct spi_device *spi, struct spi_transfer *xfer)
  99                 return -EIO;
 100         }
 101
 102 -       controller->mode = mode = spi_qup_get_mode(spi->master, xfer);
 103 +       controller->w_size = DIV_ROUND_UP(xfer->bits_per_word, 8);
 104 +       controller->n_words = xfer->len / controller->w_size;
 105         n_words = controller->n_words;
 106
 107 -       if (mode == QUP_IO_M_MODE_FIFO) {
 108 +       if (n_words <= (controller->in_fifo_sz / sizeof(u32))) {
 109 +               controller->mode = QUP_IO_M_MODE_FIFO;
 110                 writel_relaxed(n_words, controller->base + QUP_MX_READ_CNT);
 111                 writel_relaxed(n_words, controller->base + QUP_MX_WRITE_CNT);
 112                 /* must be zero for FIFO */
 113                 writel_relaxed(0, controller->base + QUP_MX_INPUT_CNT);
 114                 writel_relaxed(0, controller->base + QUP_MX_OUTPUT_CNT);
 115                 controller->use_dma = 0;
 116 -       } else if (!controller->use_dma) {
 117 -               writel_relaxed(n_words, controller->base + QUP_MX_INPUT_CNT);
 118 -               writel_relaxed(n_words, controller->base + QUP_MX_OUTPUT_CNT);
 119 -               /* must be zero for BLOCK and BAM */
 120 -               writel_relaxed(0, controller->base + QUP_MX_READ_CNT);
 121 -               writel_relaxed(0, controller->base + QUP_MX_WRITE_CNT);
 122 -       } else {
 123 -               mode = QUP_IO_M_MODE_BAM;
 124 +       } else if (spi->master->can_dma &&
 125 +           spi->master->can_dma(spi->master, spi, xfer) &&
 126 +           spi->master->cur_msg_mapped) {
 127 +               controller->mode = QUP_IO_M_MODE_BAM;
 128                 writel_relaxed(0, controller->base + QUP_MX_READ_CNT);
 129                 writel_relaxed(0, controller->base + QUP_MX_WRITE_CNT);
 130
 131 @@ -541,19 +514,26 @@ static int spi_qup_io_config(struct spi_device *spi, struct spi_transfer *xfer)
 132
 133                         writel_relaxed(0, controller->base + QUP_MX_OUTPUT_CNT);
 134                 }
 135 +       } else {
 136 +               controller->mode = QUP_IO_M_MODE_BLOCK;
 137 +               writel_relaxed(n_words, controller->base + QUP_MX_INPUT_CNT);
 138 +               writel_relaxed(n_words, controller->base + QUP_MX_OUTPUT_CNT);
 139 +               /* must be zero for BLOCK and BAM */
 140 +               writel_relaxed(0, controller->base + QUP_MX_READ_CNT);
 141 +               writel_relaxed(0, controller->base + QUP_MX_WRITE_CNT);
 142         }
 143
 144         iomode = readl_relaxed(controller->base + QUP_IO_M_MODES);
 145         /* Set input and output transfer mode */
 146         iomode &= ~(QUP_IO_M_INPUT_MODE_MASK | QUP_IO_M_OUTPUT_MODE_MASK);
 147
 148 -       if (!controller->use_dma)
 149 +       if (!spi_qup_is_dma_xfer(controller->mode))
 150                 iomode &= ~(QUP_IO_M_PACK_EN | QUP_IO_M_UNPACK_EN);
 151         else
 152                 iomode |= QUP_IO_M_PACK_EN | QUP_IO_M_UNPACK_EN;
 153
 154 -       iomode |= (mode << QUP_IO_M_OUTPUT_MODE_MASK_SHIFT);
 155 -       iomode |= (mode << QUP_IO_M_INPUT_MODE_MASK_SHIFT);
 156 +       iomode |= (controller->mode << QUP_IO_M_OUTPUT_MODE_MASK_SHIFT);
 157 +       iomode |= (controller->mode << QUP_IO_M_INPUT_MODE_MASK_SHIFT);
 158
 159         writel_relaxed(iomode, controller->base + QUP_IO_M_MODES);
 160
 161 @@ -594,7 +574,7 @@ static int spi_qup_io_config(struct spi_device *spi, struct spi_transfer *xfer)
 162         config |= xfer->bits_per_word - 1;
 163         config |= QUP_CONFIG_SPI_MODE;
 164
 165 -       if (controller->use_dma) {
 166 +       if (spi_qup_is_dma_xfer(controller->mode)) {
 167                 if (!xfer->tx_buf)
 168                         config |= QUP_CONFIG_NO_OUTPUT;
 169                 if (!xfer->rx_buf)
 170 @@ -612,7 +592,7 @@ static int spi_qup_io_config(struct spi_device *spi, struct spi_transfer *xfer)
 171                  * status change in BAM mode
 172                  */
 173
 174 -               if (mode == QUP_IO_M_MODE_BAM)
 175 +               if (spi_qup_is_dma_xfer(controller->mode))
 176                         mask = QUP_OP_IN_SERVICE_FLAG | QUP_OP_OUT_SERVICE_FLAG;
 177
 178                 writel_relaxed(mask, controller->base + QUP_OPERATIONAL_MASK);
 179 @@ -646,7 +626,7 @@ static int spi_qup_transfer_one(struct spi_master *master,
 180         controller->tx_bytes = 0;
 181         spin_unlock_irqrestore(&controller->lock, flags);
 182
 183 -       if (controller->use_dma)
 184 +       if (spi_qup_is_dma_xfer(controller->mode))
 185                 ret = spi_qup_do_dma(master, xfer);
 186         else
 187                 ret = spi_qup_do_pio(master, xfer);
 188 @@ -670,7 +650,7 @@ exit:
 189                 ret = controller->error;
 190         spin_unlock_irqrestore(&controller->lock, flags);
 191
 192 -       if (ret && controller->use_dma)
 193 +       if (ret && spi_qup_is_dma_xfer(controller->mode))
 194                 spi_qup_dma_terminate(master, xfer);
 195
 196         return ret;
 197 @@ -681,9 +661,7 @@ static bool spi_qup_can_dma(struct spi_master *master, struct spi_device *spi,
 198  {
 199         struct spi_qup *qup = spi_master_get_devdata(master);
 200         size_t dma_align = dma_get_cache_alignment();
 201 -       u32 mode;
 202 -
 203 -       qup->use_dma = 0;
 204 +       int n_words;
 205
 206         if (xfer->rx_buf && (xfer->len % qup->in_blk_sz ||
 207             IS_ERR_OR_NULL(master->dma_rx) ||
 208 @@ -695,12 +673,10 @@ static bool spi_qup_can_dma(struct spi_master *master, struct spi_device *spi,
 209             !IS_ALIGNED((size_t)xfer->tx_buf, dma_align)))
 210                 return false;
 211
 212 -       mode = spi_qup_get_mode(master, xfer);
 213 -       if (mode == QUP_IO_M_MODE_FIFO)
 214 +       n_words = xfer->len / DIV_ROUND_UP(xfer->bits_per_word, 8);
 215 +       if (n_words <= (qup->in_fifo_sz / sizeof(u32)))
 216                 return false;
 217
 218 -       qup->use_dma = 1;
 219 -
 220         return true;
 221  }
 222
 223 --
 224 2.7.2
 225