From 3e9c146f4997e32d257215b0036b2425c6053ffe Mon Sep 17 00:00:00 2001 From: Bjorn Andersson Date: Wed, 20 Apr 2022 21:15:50 -0700 Subject: [PATCH] drm/msm/dpu: Issue MDSS reset during initialization It's typical for the bootloader to bring up the display for showing a boot splash or efi framebuffer. But in some cases the kernel driver ends up only partially configuring (in particular) the DPU, which might result in e.g. that two different data paths attempts to push data to the interface - with resulting graphical artifacts. Naturally the end goal would be to inherit the bootloader's configuration and provide the user with a glitch free handover from the boot configuration to a running DPU. But as implementing seamless transition from the bootloader configuration to the running OS will be a considerable effort, start by simply resetting the entire MDSS to its power-on state, to avoid the partial configuration. Signed-off-by: Bjorn Andersson Reviewed-by: Dmitry Baryshkov Patchwork: https://patchwork.freedesktop.org/patch/482796/ Link: https://lore.kernel.org/r/20220421041550.643964-2-bjorn.andersson@linaro.org Signed-off-by: Dmitry Baryshkov --- drivers/gpu/drm/msm/msm_mdss.c | 32 ++++++++++++++++++++++++++++++++ 1 file changed, 32 insertions(+) diff --git a/drivers/gpu/drm/msm/msm_mdss.c b/drivers/gpu/drm/msm/msm_mdss.c index f6f0d0fa5ab28..20f154dda9cf3 100644 --- a/drivers/gpu/drm/msm/msm_mdss.c +++ b/drivers/gpu/drm/msm/msm_mdss.c @@ -4,11 +4,13 @@ */ #include +#include #include #include #include #include #include +#include #include "msm_drv.h" #include "msm_kms.h" @@ -193,6 +195,32 @@ static void msm_mdss_destroy(struct msm_mdss *msm_mdss) irq_set_chained_handler_and_data(irq, NULL, NULL); } +static int msm_mdss_reset(struct device *dev) +{ + struct reset_control *reset; + + reset = reset_control_get_optional_exclusive(dev, NULL); + if (!reset) { + /* Optional reset not specified */ + return 0; + } else if (IS_ERR(reset)) { + return dev_err_probe(dev, PTR_ERR(reset), + "failed to acquire mdss reset\n"); + } + + reset_control_assert(reset); + /* + * Tests indicate that reset has to be held for some period of time, + * make it one frame in a typical system + */ + msleep(20); + reset_control_deassert(reset); + + reset_control_put(reset); + + return 0; +} + /* * MDP5 MDSS uses at most three specified clocks. */ @@ -229,6 +257,10 @@ static struct msm_mdss *msm_mdss_init(struct platform_device *pdev, bool is_mdp5 int ret; int irq; + ret = msm_mdss_reset(&pdev->dev); + if (ret) + return ERR_PTR(ret); + msm_mdss = devm_kzalloc(&pdev->dev, sizeof(*msm_mdss), GFP_KERNEL); if (!msm_mdss) return ERR_PTR(-ENOMEM); -- 2.30.2