target/linux/brcm2708/patches-4.19/950-0553-spi-bcm2835-enable-shared-interrupt-support.patch

   1 From bca62369ca063a66ab3bfb3d129d76da88a3b99b Mon Sep 17 00:00:00 2001
   2 From: Martin Sperl <kernel@martin.sperl.org>
   3 Date: Mon, 13 May 2019 11:05:27 +0000
   4 Subject: [PATCH 553/725] spi: bcm2835: enable shared interrupt support
   5
   6 Add shared interrupt support for this driver.
   7
   8 Signed-off-by: Martin Sperl <kernel@martin.sperl.org>
   9 ---
  10  drivers/spi/spi-bcm2835.c | 7 ++++++-
  11  1 file changed, 6 insertions(+), 1 deletion(-)
  12
  13 --- a/drivers/spi/spi-bcm2835.c
  14 +++ b/drivers/spi/spi-bcm2835.c
  15 @@ -150,6 +150,10 @@ static irqreturn_t bcm2835_spi_interrupt
  16         struct spi_master *master = dev_id;
  17         struct bcm2835_spi *bs = spi_master_get_devdata(master);
  18
  19 +       /* check if we got interrupt enabled */
  20 +       if (!(bcm2835_rd(bs, BCM2835_SPI_CS) & BCM2835_SPI_CS_INTR))
  21 +               return IRQ_NONE;
  22 +
  23         /* Read as many bytes as possible from FIFO */
  24         bcm2835_rd_fifo(bs);
  25         /* Write as many bytes as possible to FIFO */
  26 @@ -756,7 +760,8 @@ static int bcm2835_spi_probe(struct plat
  27         bcm2835_wr(bs, BCM2835_SPI_CS,
  28                    BCM2835_SPI_CS_CLEAR_RX | BCM2835_SPI_CS_CLEAR_TX);
  29
  30 -       err = devm_request_irq(&pdev->dev, bs->irq, bcm2835_spi_interrupt, 0,
  31 +       err = devm_request_irq(&pdev->dev, bs->irq, bcm2835_spi_interrupt,
  32 +                              IRQF_SHARED,
  33                                dev_name(&pdev->dev), master);
  34         if (err) {
  35                 dev_err(&pdev->dev, "could not request IRQ: %d\n", err);