Hi Jagan,
On 09.12.2022 16:23, Jagan Teki wrote:
> The existing drm panels and bridges in Exynos required host
> initialization during the first DSI command transfer even though
> the initialization was done before.
>
> This host reinitialization is handled via DSIM_STATE_REINITIALIZED
> flag and triggers from host transfer.
>
> Do this exclusively for Exynos.
>
> Initial logic is derived from Marek Szyprowski changes.
>
> Signed-off-by: Marek Szyprowski <m.szyprow...@samsung.com>
> Signed-off-by: Jagan Teki <ja...@amarulasolutions.com>
> ---
> Changes from v9:
> - derived from v8
> - added comments
>
> drivers/gpu/drm/bridge/samsung-dsim.c | 15 ++++++++++++++-
> include/drm/bridge/samsung-dsim.h | 5 +++--
> 2 files changed, 17 insertions(+), 3 deletions(-)
The following chunk is missing compared to v8:
diff --git a/drivers/gpu/drm/bridge/samsung-dsim.c
b/drivers/gpu/drm/bridge/samsung-dsim.c
index 6e9ad955ebd3..6a9403cb92ae 100644
--- a/drivers/gpu/drm/bridge/samsung-dsim.c
+++ b/drivers/gpu/drm/bridge/samsung-dsim.c
@@ -1315,7 +1315,9 @@ static int samsung_dsim_init(struct samsung_dsim
*dsi, unsigned int flag)
return 0;
samsung_dsim_reset(dsi);
- samsung_dsim_enable_irq(dsi);
+
+ if (!(dsi->state & DSIM_STATE_INITIALIZED))
+ samsung_dsim_enable_irq(dsi);
if (driver_data->reg_values[RESET_TYPE] == DSIM_FUNCRST)
samsung_dsim_enable_lane(dsi, BIT(dsi->lanes) - 1);
> diff --git a/drivers/gpu/drm/bridge/samsung-dsim.c
> b/drivers/gpu/drm/bridge/samsung-dsim.c
> index 2e15d753fdd0..ec3ab679afd9 100644
> --- a/drivers/gpu/drm/bridge/samsung-dsim.c
> +++ b/drivers/gpu/drm/bridge/samsung-dsim.c
> @@ -1254,6 +1254,19 @@ static int samsung_dsim_init(struct samsung_dsim *dsi,
> unsigned int flag)
> {
> const struct samsung_dsim_driver_data *driver_data = dsi->driver_data;
>
> + /*
> + * FIXME:
> + * The existing drm panels and bridges in Exynos required host
> + * initialization during the first DSI command transfer even though
> + * the initialization was done before.
> + *
> + * This host reinitialization is handled via DSIM_STATE_REINITIALIZED
> + * flag and triggers from host transfer. Do this exclusively for Exynos.
> + */
> + if ((dsi->plat_data->hw_type == SAMSUNG_DSIM_TYPE_IMX8MM) &&
> + dsi->state & DSIM_STATE_REINITIALIZED)
> + return 0;
> +
> if (dsi->state & flag)
> return 0;
>
> @@ -1467,7 +1480,7 @@ static ssize_t samsung_dsim_host_transfer(struct
> mipi_dsi_host *host,
> if (!(dsi->state & DSIM_STATE_ENABLED))
> return -EINVAL;
>
> - ret = samsung_dsim_init(dsi, DSIM_STATE_INITIALIZED);
> + ret = samsung_dsim_init(dsi, DSIM_STATE_REINITIALIZED);
> if (ret)
> return ret;
>
> diff --git a/include/drm/bridge/samsung-dsim.h
> b/include/drm/bridge/samsung-dsim.h
> index b8132bf8e36f..0c5a905f3de7 100644
> --- a/include/drm/bridge/samsung-dsim.h
> +++ b/include/drm/bridge/samsung-dsim.h
> @@ -17,8 +17,9 @@ struct samsung_dsim;
>
> #define DSIM_STATE_ENABLED BIT(0)
> #define DSIM_STATE_INITIALIZED BIT(1)
> -#define DSIM_STATE_CMD_LPM BIT(2)
> -#define DSIM_STATE_VIDOUT_AVAILABLE BIT(3)
> +#define DSIM_STATE_REINITIALIZED BIT(2)
> +#define DSIM_STATE_CMD_LPM BIT(3)
> +#define DSIM_STATE_VIDOUT_AVAILABLE BIT(4)
>
> enum samsung_dsim_type {
> SAMSUNG_DSIM_TYPE_EXYNOS3250,
Best regards
--
Marek Szyprowski, PhD
Samsung R&D Institute Poland
