DSI host initialization handling in previous exynos dsi driver has some pitfalls. It initializes the host during host transfer() hook that is indeed not the desired call flow for I2C and any other DSI configured downstream bridges. Host transfer() is usually triggered for downstream DSI panels or bridges and I2C-configured-DSI bridges miss these host initialization as these downstream bridges use bridge operations hooks like pre_enable, and enable in order to initialize or set up the host. This patch is trying to handle the host init handler to satisfy all downstream panels and bridges. Added the DSIM_STATE_REINITIALIZED state flag to ensure that host init is also done on first cmd transfer, this helps existing DSI panels work on exynos platform (form Marek Szyprowski). v4: * update init handling to ensure host init done on first cmd transfer v3: * none v2: * check initialized state in samsung_dsim_init v1: * keep DSI init in host transfer Signed-off-by: Marek Szyprowski <m.szyprowski@xxxxxxxxxxx> Signed-off-by: Jagan Teki <jagan@xxxxxxxxxxxxxxxxxxxx> --- drivers/gpu/drm/bridge/samsung-dsim.c | 25 +++++++++++++++++-------- include/drm/bridge/samsung-dsim.h | 5 +++-- 2 files changed, 20 insertions(+), 10 deletions(-) diff --git a/drivers/gpu/drm/bridge/samsung-dsim.c b/drivers/gpu/drm/bridge/samsung-dsim.c index c3ed317996ad..b6883a6d4681 100644 --- a/drivers/gpu/drm/bridge/samsung-dsim.c +++ b/drivers/gpu/drm/bridge/samsung-dsim.c @@ -1254,12 +1254,17 @@ static void samsung_dsim_disable_irq(struct samsung_dsim *dsi) disable_irq(dsi->irq); } -static int samsung_dsim_init(struct samsung_dsim *dsi) +static int samsung_dsim_init(struct samsung_dsim *dsi, unsigned int flag) { const struct samsung_dsim_driver_data *driver_data = dsi->driver_data; + if (dsi->state & 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); @@ -1270,6 +1275,8 @@ static int samsung_dsim_init(struct samsung_dsim *dsi) samsung_dsim_set_phy_ctrl(dsi); samsung_dsim_init_link(dsi); + dsi->state |= flag; + return 0; } @@ -1289,6 +1296,10 @@ static void samsung_dsim_atomic_pre_enable(struct drm_bridge *bridge, } dsi->state |= DSIM_STATE_ENABLED; + + ret = samsung_dsim_init(dsi, DSIM_STATE_INITIALIZED); + if (ret) + return; } static void samsung_dsim_atomic_enable(struct drm_bridge *bridge, @@ -1464,12 +1475,9 @@ static ssize_t samsung_dsim_host_transfer(struct mipi_dsi_host *host, if (!(dsi->state & DSIM_STATE_ENABLED)) return -EINVAL; - if (!(dsi->state & DSIM_STATE_INITIALIZED)) { - ret = samsung_dsim_init(dsi); - if (ret) - return ret; - dsi->state |= DSIM_STATE_INITIALIZED; - } + ret = samsung_dsim_init(dsi, DSIM_STATE_REINITIALIZED); + if (ret) + return ret; ret = mipi_dsi_create_packet(&xfer.packet, msg); if (ret < 0) @@ -1654,6 +1662,7 @@ static int __maybe_unused samsung_dsim_suspend(struct device *dev) if (dsi->state & DSIM_STATE_INITIALIZED) { dsi->state &= ~DSIM_STATE_INITIALIZED; + dsi->state &= ~DSIM_STATE_REINITIALIZED; samsung_dsim_disable_clock(dsi); diff --git a/include/drm/bridge/samsung-dsim.h b/include/drm/bridge/samsung-dsim.h index 97fdee5ef5df..e15fbfd49efe 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) struct samsung_dsim_transfer { struct list_head list; -- 2.25.1