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[0/5] drm/msm/dp: Allow variation in register regions

Message ID 20210722024227.3313096-1-bjorn.andersson@linaro.org
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Series drm/msm/dp: Allow variation in register regions | expand

Message

Bjorn Andersson July 22, 2021, 2:42 a.m. UTC 
It turns out that sc8180x (among others) doesn't have the same internal layout
of the 4 subblocks. This series therefor modifies the binding to require all
four regions to be described individually and then extends the driver to read
these four regions. The driver will fall back to read the old single-reg format
and apply the original offsets and sizes.

Bjorn Andersson (5):
  dt-bindings: msm/dp: Change reg definition
  drm/msm/dp: Use devres for ioremap()
  drm/msm/dp: Refactor ioremap wrapper
  drm/msm/dp: Store each subblock in the io region
  drm/msm/dp: Allow sub-regions to be specified in DT

 .../bindings/display/msm/dp-controller.yaml   |  11 +-
 drivers/gpu/drm/msm/dp/dp_catalog.c           |  64 ++++-------
 drivers/gpu/drm/msm/dp/dp_parser.c            | 102 +++++++++++-------
 drivers/gpu/drm/msm/dp/dp_parser.h            |  10 +-
 4 files changed, 102 insertions(+), 85 deletions(-)

-- 
2.29.2

Comments

Stephen Boyd July 22, 2021, 8:09 p.m. UTC | #1 
Quoting Bjorn Andersson (2021-07-21 19:42:25)
> In order to deal with multiple memory ranges in the following commit
> change the ioremap wrapper to not poke directly into the dss_io_data
> struct.
>
> Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
> ---
>  drivers/gpu/drm/msm/dp/dp_parser.c | 28 ++++++++++++++--------------
>  drivers/gpu/drm/msm/dp/dp_parser.h |  2 +-
>  2 files changed, 15 insertions(+), 15 deletions(-)
>
> diff --git a/drivers/gpu/drm/msm/dp/dp_parser.c b/drivers/gpu/drm/msm/dp/dp_parser.c
> index c064ced78278..e68dacef547c 100644
> --- a/drivers/gpu/drm/msm/dp/dp_parser.c
> +++ b/drivers/gpu/drm/msm/dp/dp_parser.c
> @@ -19,39 +19,39 @@ static const struct dp_regulator_cfg sdm845_dp_reg_cfg = {
>         },
>  };
>
> -static int msm_dss_ioremap(struct platform_device *pdev,
> -                               struct dss_io_data *io_data)
> +static void __iomem *dp_ioremap(struct platform_device *pdev, int idx, size_t *len)
>  {
>         struct resource *res = NULL;

Can we drop assignment to NULL too?

> +       void __iomem *base;
>
> -       res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> +       res = platform_get_resource(pdev, IORESOURCE_MEM, idx);
>         if (!res) {
>                 DRM_ERROR("%pS->%s: msm_dss_get_res failed\n",
>                         __builtin_return_address(0), __func__);
> -               return -ENODEV;
> +               return ERR_PTR(-ENODEV);
>         }
>
> -       io_data->len = (u32)resource_size(res);
> -       io_data->base = devm_ioremap(&pdev->dev, res->start, io_data->len);
> -       if (!io_data->base) {
> +       base = devm_ioremap_resource(&pdev->dev, res);
> +       if (!base) {

devm_ioremap_resource() returns an ERR_PTR on failure, not NULL.

>                 DRM_ERROR("%pS->%s: ioremap failed\n",
>                         __builtin_return_address(0), __func__);
> -               return -EIO;
> +               return ERR_PTR(-EIO);
>         }
>
> -       return 0;
> +       *len = resource_size(res);
> +       return base;
>  }
>
>  static int dp_parser_ctrl_res(struct dp_parser *parser)
>  {
> -       int rc = 0;
>         struct platform_device *pdev = parser->pdev;
>         struct dp_io *io = &parser->io;
> +       struct dss_io_data *dss = &io->dp_controller;
>
> -       rc = msm_dss_ioremap(pdev, &io->dp_controller);
> -       if (rc) {
> -               DRM_ERROR("unable to remap dp io resources, rc=%d\n", rc);
> -               return rc;
> +       dss->base = dp_ioremap(pdev, 0, &dss->len);
> +       if (IS_ERR(dss->base)) {
> +               DRM_ERROR("unable to remap dp io region: %pe\n", dss->base);
> +               return PTR_ERR(dss->base);
>         }
>
>         io->phy = devm_phy_get(&pdev->dev, "dp");