Linux resets the LTDC on probe. Let's do the same in barebox, so a chainloaded barebox doesn't attempt reconfiguration of the DSI host while the LTDC is still streaming to it.
Tested by chainloading the generic BL33 image on an STM32MP157C-DK2 and observing it doesn't hang when framebuffer support is enabled. Signed-off-by: Ahmad Fatoum <[email protected]> --- drivers/video/stm32_ltdc.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/drivers/video/stm32_ltdc.c b/drivers/video/stm32_ltdc.c index 43d443788364..5165bbf01749 100644 --- a/drivers/video/stm32_ltdc.c +++ b/drivers/video/stm32_ltdc.c @@ -272,6 +272,10 @@ static int ltdc_probe(struct device *dev) if (IS_ERR(hw->pclk)) return dev_errp_probe(dev, hw->pclk, "peripheral clock get\n"); + ret = device_reset_us(dev, 10); + if (ret) + return dev_err_probe(dev, ret, "peripheral reset\n"); + for_each_available_child_of_node(dev->of_node, np) { struct ltdc_fb *priv; struct of_endpoint ep; -- 2.47.3
