[PATCH v3 1/2] media: imx: imx7-media-csi: add support for imx8mq

[Martin Kepplinger]

Am Montag, dem 22.11.2021 um 08:27 +0100 schrieb Martin Kepplinger:
> Modeled after the NXP driver mx6s_capture.c that this driver is based
> on,
> imx8mq needs different settings for the baseaddr_switch mechanism.
> Define
> the needed bits and set that for imx8mq.
> 
> Without these settings, the system will "sometimes" hang completely
> when
> starting to stream (the interrupt will never be called).
> 
> Signed-off-by: Martin Kepplinger <martin.kepplinger at puri.sm>
> Acked-by: Rui Miguel Silva <rmfrfs at gmail.com>
> ---
> 
> revision history
> ----------------
> v3:
>  * fix compiler warning when assigning a 64 bit (void *) to an int
>  * add Ruis' Acked-by tag
> 
> v2: (thank you Rui and Laurent)
>  * rename function and enum
>  * remove unrealted newline
>  * add Laurents reviewed tag to the bindings patch
>  https://lore.kernel.org/linux-media/20211118063347.3370678-1-martin.kepplinger@puri.sm/
> 
> v1:
> https://lore.kernel.org/linux-media/20211117092710.3084034-1-martin.kepplinger@puri.sm/T/#t
> 
> 
> 
>  drivers/staging/media/imx/imx7-media-csi.c | 32
> ++++++++++++++++++++--
>  1 file changed, 30 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/staging/media/imx/imx7-media-csi.c
> b/drivers/staging/media/imx/imx7-media-csi.c
> index 2288dadb2683..32311fc0e2a4 100644
> --- a/drivers/staging/media/imx/imx7-media-csi.c
> +++ b/drivers/staging/media/imx/imx7-media-csi.c
> @@ -12,6 +12,7 @@
>  #include <linux/interrupt.h>
>  #include <linux/mfd/syscon.h>
>  #include <linux/module.h>
> +#include <linux/of_device.h>
>  #include <linux/of_graph.h>
>  #include <linux/pinctrl/consumer.h>
>  #include <linux/platform_device.h>
> @@ -122,6 +123,10 @@
>  #define BIT_DATA_FROM_MIPI             BIT(22)
>  #define BIT_MIPI_YU_SWAP               BIT(21)
>  #define BIT_MIPI_DOUBLE_CMPNT          BIT(20)
> +#define BIT_MASK_OPTION_FIRST_FRAME    (0 << 18)
> +#define BIT_MASK_OPTION_CSI_EN         (1 << 18)
> +#define BIT_MASK_OPTION_SECOND_FRAME   (2 << 18)
> +#define BIT_MASK_OPTION_ON_DATA                (3 << 18)
>  #define BIT_BASEADDR_CHG_ERR_EN                BIT(9)
>  #define BIT_BASEADDR_SWITCH_SEL                BIT(5)
>  #define BIT_BASEADDR_SWITCH_EN         BIT(4)
> @@ -154,6 +159,11 @@
>  #define CSI_CSICR18                    0x48
>  #define CSI_CSICR19                    0x4c
>  
> +enum imx_csi_model {
> +       IMX7_CSI_IMX7 = 0,
> +       IMX7_CSI_IMX8MQ,
> +};
> +
>  struct imx7_csi {
>         struct device *dev;
>         struct v4l2_subdev sd;
> @@ -189,6 +199,8 @@ struct imx7_csi {
>         bool is_csi2;
>  
>         struct completion last_eof_completion;
> +
> +       enum imx_csi_model model;
>  };
>  
>  static struct imx7_csi *
> @@ -537,6 +549,16 @@ static void imx7_csi_deinit(struct imx7_csi
> *csi,
>         clk_disable_unprepare(csi->mclk);
>  }
>  
> +static void imx7_csi_baseaddr_switch_on_second_frame(struct imx7_csi
> *csi)
> +{
> +       u32 cr18 = imx7_csi_reg_read(csi, CSI_CSICR18);
> +
> +       cr18 |= BIT_BASEADDR_SWITCH_EN | BIT_BASEADDR_SWITCH_SEL |
> +               BIT_BASEADDR_CHG_ERR_EN;
> +       cr18 |= BIT_MASK_OPTION_SECOND_FRAME;
> +       imx7_csi_reg_write(csi, cr18, CSI_CSICR18);
> +}
> +
>  static void imx7_csi_enable(struct imx7_csi *csi)
>  {
>         /* Clear the Rx FIFO and reflash the DMA controller. */
> @@ -552,6 +574,9 @@ static void imx7_csi_enable(struct imx7_csi *csi)
>         /* Enable the RxFIFO DMA and the CSI. */
>         imx7_csi_dmareq_rff_enable(csi);
>         imx7_csi_hw_enable(csi);
> +
> +       if (csi->model == IMX7_CSI_IMX8MQ)
> +               imx7_csi_baseaddr_switch_on_second_frame(csi);
>  }
>  
>  static void imx7_csi_disable(struct imx7_csi *csi)
> @@ -1155,6 +1180,8 @@ static int imx7_csi_probe(struct
> platform_device *pdev)
>         if (IS_ERR(csi->regbase))
>                 return PTR_ERR(csi->regbase);
>  
> +       csi->model = (enum
> imx_csi_model)(uintptr_t)of_device_get_match_data(&pdev->dev);
> +
>         spin_lock_init(&csi->irqlock);
>         mutex_init(&csi->lock);
>  
> @@ -1249,8 +1276,9 @@ static int imx7_csi_remove(struct
> platform_device *pdev)
>  }
>  
>  static const struct of_device_id imx7_csi_of_match[] = {
> -       { .compatible = "fsl,imx7-csi" },
> -       { .compatible = "fsl,imx6ul-csi" },
> +       { .compatible = "fsl,imx8mq-csi", .data = (void
> *)IMX7_CSI_IMX8MQ },
> +       { .compatible = "fsl,imx7-csi", .data = (void *)IMX7_CSI_IMX7
> },
> +       { .compatible = "fsl,imx6ul-csi", .data = (void
> *)IMX7_CSI_IMX7 },
>         { },
>  };
>  MODULE_DEVICE_TABLE(of, imx7_csi_of_match);

Laurent et al.

Any doubts about this? I run it for a long time now an it fixes the
driver on imx8mq.

thank you and all the best,

                             martin