From 4ac25315460ac2a92cd30aad5675f73c55428a9b Mon Sep 17 00:00:00 2001 From: Neil Armstrong Date: Thu, 14 Mar 2019 09:37:38 +0100 Subject: [PATCH] [WiP] drm/panfrost: add support for custom soft-reset on Amlogic GXM --- drivers/gpu/drm/panfrost/panfrost_gpu.c | 13 ++++++++++++- drivers/gpu/drm/panfrost/panfrost_regs.h | 3 +++ 2 files changed, 15 insertions(+), 1 deletion(-) diff --git a/drivers/gpu/drm/panfrost/panfrost_gpu.c b/drivers/gpu/drm/panfrost/panfrost_gpu.c index c827fd324c23c5..3d83b94115c67b 100644 --- a/drivers/gpu/drm/panfrost/panfrost_gpu.c +++ b/drivers/gpu/drm/panfrost/panfrost_gpu.c @@ -5,7 +5,9 @@ #include #include #include +#include #include +#include #include #include @@ -49,7 +51,16 @@ static int panfrost_gpu_soft_reset(struct panfrost_device *pfdev) gpu_write(pfdev, GPU_INT_MASK, 0); gpu_write(pfdev, GPU_INT_CLEAR, GPU_IRQ_RESET_COMPLETED); - gpu_write(pfdev, GPU_CMD, GPU_CMD_SOFT_RESET); + + if (of_device_is_compatible(pfdev->dev->of_node, "amlogic,meson-gxm-mali")) { + reset_control_assert(pfdev->rstc); + udelay(10); + reset_control_deassert(pfdev->rstc); + + gpu_write(pfdev, GPU_PWR_KEY, 0x2968A819); + gpu_write(pfdev, GPU_PWR_OVERRIDE1, 0xfff | (0x20 << 16)); + } else + gpu_write(pfdev, GPU_CMD, GPU_CMD_SOFT_RESET); ret = readl_relaxed_poll_timeout(pfdev->iomem + GPU_INT_RAWSTAT, val, val & GPU_IRQ_RESET_COMPLETED, 100, 10000); diff --git a/drivers/gpu/drm/panfrost/panfrost_regs.h b/drivers/gpu/drm/panfrost/panfrost_regs.h index 0ec7b13c0671f7..3c1f4f92b3bfa8 100644 --- a/drivers/gpu/drm/panfrost/panfrost_regs.h +++ b/drivers/gpu/drm/panfrost/panfrost_regs.h @@ -46,6 +46,9 @@ #define GPU_CMD_SOFT_RESET 0x01 #define GPU_STATUS 0x34 #define GPU_LATEST_FLUSH_ID 0x38 +#define GPU_PWR_KEY 0x050 /* (WO) Power manager key register */ +#define GPU_PWR_OVERRIDE0 0x054 /* (RW) Power manager override settings */ +#define GPU_PWR_OVERRIDE1 0x058 /* (RW) Power manager override settings */ #define GPU_THREAD_MAX_THREADS 0x0A0 /* (RO) Maximum number of threads per core */ #define GPU_THREAD_MAX_WORKGROUP_SIZE 0x0A4 /* (RO) Maximum workgroup size */