Re: [PATCH 02/11] drm: bridge: samsung-dsim: Handle platform init via driver_data

Marek Szyprowski
2022-04-12T09:58:07Z

On 08.04.2022 18:20, Jagan Teki wrote:
> In order to make a common Samsung DSIM bridge driver some platform specific
> glue code needs to maintain separately as it is hard to maintain platform
> specific glue and conventional component_ops on the drm bridge drivers side.
>
> This patch is trying to support that glue code initialization and invocation
> in the form of platform_init flag in driver_data.
>
> So, the platforms which enable platform_init flags will handle all platform
> specific initialization via samsung_dsim_plat_probe.
>
> The Platform probe is responsible to
> - initialize samsung_dsim_plat_data and install hooks
> - initialize component_ops
> - preserve samsung_dsim structure pointer
>
> v1:
> * use platform_init instead of exynos_specific
> * handle component_ops in glue code
>
> Signed-off-by: Jagan Teki <jagan@amarulasolutions.com>
> ---
> drivers/gpu/drm/bridge/samsung-dsim.c | 20 ++++++++++++++++----
> include/drm/bridge/samsung-dsim.h | 1 +
> 2 files changed, 17 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/gpu/drm/bridge/samsung-dsim.c b/drivers/gpu/drm/bridge/samsung-dsim.c
> index ee5d7e5518a6..0e6a5d1c7e4e 100644
> --- a/drivers/gpu/drm/bridge/samsung-dsim.c
> +++ b/drivers/gpu/drm/bridge/samsung-dsim.c
> @@ -370,6 +370,7 @@ static const struct samsung_dsim_driver_data exynos3_dsi_driver_data = {
> .wait_for_reset = 1,
> .num_bits_resol = 11,
> .reg_values = reg_values,
> + .platform_init = true,
> };
>
> static const struct samsung_dsim_driver_data exynos4_dsi_driver_data = {
> @@ -382,6 +383,7 @@ static const struct samsung_dsim_driver_data exynos4_dsi_driver_data = {
> .wait_for_reset = 1,
> .num_bits_resol = 11,
> .reg_values = reg_values,
> + .platform_init = true,
> };
>
> static const struct samsung_dsim_driver_data exynos5_dsi_driver_data = {
> @@ -392,6 +394,7 @@ static const struct samsung_dsim_driver_data exynos5_dsi_driver_data = {
> .wait_for_reset = 1,
> .num_bits_resol = 11,
> .reg_values = reg_values,
> + .platform_init = true,
> };
>
> static const struct samsung_dsim_driver_data exynos5433_dsi_driver_data = {
> @@ -403,6 +406,7 @@ static const struct samsung_dsim_driver_data exynos5433_dsi_driver_data = {
> .wait_for_reset = 0,
> .num_bits_resol = 12,
> .reg_values = exynos5433_reg_values,
> + .platform_init = true,
> };
>
> static const struct samsung_dsim_driver_data exynos5422_dsi_driver_data = {
> @@ -414,6 +418,7 @@ static const struct samsung_dsim_driver_data exynos5422_dsi_driver_data = {
> .wait_for_reset = 1,
> .num_bits_resol = 12,
> .reg_values = exynos5422_reg_values,
> + .platform_init = true,
> };
>
> static const struct of_device_id samsung_dsim_of_match[] = {
> @@ -1565,12 +1570,16 @@ static int samsung_dsim_probe(struct platform_device *pdev)
> dsi->bridge.of_node = dev->of_node;
> dsi->bridge.type = DRM_MODE_CONNECTOR_DSI;
>
> - dsi->plat_data = samsung_dsim_plat_probe(dsi);
> - if (IS_ERR(dsi->plat_data)) {
> + if (dsi->driver_data->platform_init) {
> + dsi->plat_data = samsung_dsim_plat_probe(dsi);
> ret = PTR_ERR(dsi->plat_data);

ret = IS_ERR(dsi->plat_data) ? PTR_ERR(dsi->plat_data) : 0;

otherwise it always fails.

> - goto err_disable_runtime;
> + } else {
> + ret = mipi_dsi_host_register(&dsi->dsi_host);
> }
>
> + if (ret)
> + goto err_disable_runtime;
> +
> return 0;
>
> err_disable_runtime:
> @@ -1585,7 +1594,10 @@ static int samsung_dsim_remove(struct platform_device *pdev)
>
> pm_runtime_disable(&pdev->dev);
>
> - samsung_dsim_plat_remove(dsi);
> + if (dsi->driver_data->platform_init)
> + samsung_dsim_plat_remove(dsi);
> + else
> + mipi_dsi_host_unregister(&dsi->dsi_host);
>
> return 0;
> }
> diff --git a/include/drm/bridge/samsung-dsim.h b/include/drm/bridge/samsung-dsim.h
> index 59a43f9c4477..eca7eacb5910 100644
> --- a/include/drm/bridge/samsung-dsim.h
> +++ b/include/drm/bridge/samsung-dsim.h
> @@ -39,6 +39,7 @@ struct samsung_dsim_driver_data {
> unsigned int wait_for_reset;
> unsigned int num_bits_resol;
> const unsigned int *reg_values;
> + bool platform_init;
> };
>
> struct samsung_dsim_host_ops {

Best regards
--
Marek Szyprowski, PhD
Samsung R&D Institute Poland