From: Marek Szyprowski <m.szyprowski@xxxxxxxxxxx> Host transfer() in the DSI master will invoke only when the DSI commands are sent from DSI devices like DSI Panel or DSI bridges and this host the transfer wouldn't invoke for I2C-based-DSI bridge drivers. Handling DSI host initialization in transfer calls misses the controller setup for I2C configured DSI bridges. This patch updates the DSI host initialization by calling host to init from bridge pre_enable as the bridge pre_enable API is invoked by core as it is common across all classes of DSI device drivers. The host init during pre_enable is conditional and not invoked for Exynos as existing downstream drm panels and bridges in Exynos are expecting the host initialization during DSI transfer. Reviewed-by: Frieder Schrempf <frieder.schrempf@xxxxxxxxxx> Signed-off-by: Marek Szyprowski <m.szyprowski@xxxxxxxxxxx> Signed-off-by: Jagan Teki <jagan@xxxxxxxxxxxxxxxxxxxx> --- Changes for v11: - collect RB from Frieder Changes for v10: - update the to simple logic to handle all platforms Changs for v9 - v8: - none Changes for v2: - check initialized state in samsung_dsim_init Changes for v1: - keep DSI init in host transfer drivers/gpu/drm/exynos/exynos_drm_dsi.c | 27 +++++++++++++++++++------ 1 file changed, 21 insertions(+), 6 deletions(-) diff --git a/drivers/gpu/drm/exynos/exynos_drm_dsi.c b/drivers/gpu/drm/exynos/exynos_drm_dsi.c index 902bd46964cb..d4a976d86f08 100644 --- a/drivers/gpu/drm/exynos/exynos_drm_dsi.c +++ b/drivers/gpu/drm/exynos/exynos_drm_dsi.c @@ -254,6 +254,9 @@ struct exynos_dsi_transfer { #define DSIM_STATE_CMD_LPM BIT(2) #define DSIM_STATE_VIDOUT_AVAILABLE BIT(3) +#define exynos_dsi_hw_is_exynos(hw) \ + ((hw) >= DSIM_TYPE_EXYNOS3250 && (hw) <= DSIM_TYPE_EXYNOS5433) + enum exynos_dsi_type { DSIM_TYPE_EXYNOS3250, DSIM_TYPE_EXYNOS4210, @@ -1343,6 +1346,9 @@ static int exynos_dsi_init(struct exynos_dsi *dsi) { const struct exynos_dsi_driver_data *driver_data = dsi->driver_data; + if (dsi->state & DSIM_STATE_INITIALIZED) + return 0; + exynos_dsi_reset(dsi); exynos_dsi_enable_irq(dsi); @@ -1355,6 +1361,8 @@ static int exynos_dsi_init(struct exynos_dsi *dsi) exynos_dsi_set_phy_ctrl(dsi); exynos_dsi_init_link(dsi); + dsi->state |= DSIM_STATE_INITIALIZED; + return 0; } @@ -1410,6 +1418,16 @@ static void exynos_dsi_atomic_pre_enable(struct drm_bridge *bridge, } dsi->state |= DSIM_STATE_ENABLED; + + /* + * For Exynos-DSIM the downstream bridge, or panel are expecting + * the host initialization during DSI transfer. + */ + if (!exynos_dsi_hw_is_exynos(dsi->plat_data->hw_type)) { + ret = exynos_dsi_init(dsi); + if (ret) + return; + } } static void exynos_dsi_atomic_enable(struct drm_bridge *bridge, @@ -1556,12 +1574,9 @@ static ssize_t exynos_dsi_host_transfer(struct mipi_dsi_host *host, if (!(dsi->state & DSIM_STATE_ENABLED)) return -EINVAL; - if (!(dsi->state & DSIM_STATE_INITIALIZED)) { - ret = exynos_dsi_init(dsi); - if (ret) - return ret; - dsi->state |= DSIM_STATE_INITIALIZED; - } + ret = exynos_dsi_init(dsi); + if (ret) + return ret; ret = mipi_dsi_create_packet(&xfer.packet, msg); if (ret < 0) -- 2.25.1