From: Eric Anholt Date: Wed, 17 May 2017 17:56:40 -0700 Subject: drm/pl111: Add a debugfs node to dump our registers. Git-commit: 141518d23493d47bbc5acd1e2892a6ca3f638cf9 Patch-mainline: v4.13-rc1 References: FATE#326289 FATE#326079 FATE#326049 FATE#322398 FATE#326166 While debugging an X11 display failure, I wanted to see where we were actually scanning out from. This is probably generally useful to others that might be working on this device. v2: Fix uint32_t sparse warning. Signed-off-by: Eric Anholt Link: http://patchwork.freedesktop.org/patch/msgid/20170518005640.10310-1-eric@anholt.net Reviewed-by: Linus Walleij (v1) Acked-by: Petr Tesarik --- drivers/gpu/drm/pl111/Makefile | 2 + drivers/gpu/drm/pl111/pl111_debugfs.c | 55 ++++++++++++++++++++++++++++++++++ drivers/gpu/drm/pl111/pl111_drm.h | 3 + drivers/gpu/drm/pl111/pl111_drv.c | 4 ++ 4 files changed, 64 insertions(+) --- a/drivers/gpu/drm/pl111/Makefile +++ b/drivers/gpu/drm/pl111/Makefile @@ -2,4 +2,6 @@ pl111_drm-y += pl111_connector.o \ pl111_display.o \ pl111_drv.o +pl111_drm-$(CONFIG_DEBUG_FS) += pl111_debugfs.o + obj-$(CONFIG_DRM_PL111) += pl111_drm.o --- /dev/null +++ b/drivers/gpu/drm/pl111/pl111_debugfs.c @@ -0,0 +1,55 @@ +/* + * Copyright © 2017 Broadcom + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + */ + +#include +#include +#include +#include +#include "pl111_drm.h" + +#define REGDEF(reg) { reg, #reg } +static const struct { + u32 reg; + const char *name; +} pl111_reg_defs[] = { + REGDEF(CLCD_TIM0), + REGDEF(CLCD_TIM1), + REGDEF(CLCD_TIM2), + REGDEF(CLCD_TIM3), + REGDEF(CLCD_UBAS), + REGDEF(CLCD_PL111_CNTL), + REGDEF(CLCD_PL111_IENB), +}; + +int pl111_debugfs_regs(struct seq_file *m, void *unused) +{ + struct drm_info_node *node = (struct drm_info_node *)m->private; + struct drm_device *dev = node->minor->dev; + struct pl111_drm_dev_private *priv = dev->dev_private; + int i; + + for (i = 0; i < ARRAY_SIZE(pl111_reg_defs); i++) { + seq_printf(m, "%s (0x%04x): 0x%08x\n", + pl111_reg_defs[i].name, pl111_reg_defs[i].reg, + readl(priv->regs + pl111_reg_defs[i].reg)); + } + + return 0; +} + +static const struct drm_info_list pl111_debugfs_list[] = { + {"regs", pl111_debugfs_regs, 0}, +}; + +int +pl111_debugfs_init(struct drm_minor *minor) +{ + return drm_debugfs_create_files(pl111_debugfs_list, + ARRAY_SIZE(pl111_debugfs_list), + minor->debugfs_root, minor); +} --- a/drivers/gpu/drm/pl111/pl111_drm.h +++ b/drivers/gpu/drm/pl111/pl111_drm.h @@ -25,6 +25,8 @@ #define CLCD_IRQ_NEXTBASE_UPDATE BIT(2) +struct drm_minor; + struct pl111_drm_connector { struct drm_connector connector; struct drm_panel *panel; @@ -60,5 +62,6 @@ int pl111_encoder_init(struct drm_device int pl111_dumb_create(struct drm_file *file_priv, struct drm_device *dev, struct drm_mode_create_dumb *args); +int pl111_debugfs_init(struct drm_minor *minor); #endif /* _PL111_DRM_H_ */ --- a/drivers/gpu/drm/pl111/pl111_drv.c +++ b/drivers/gpu/drm/pl111/pl111_drv.c @@ -173,6 +173,10 @@ static struct drm_driver pl111_drm_drive .gem_prime_import_sg_table = drm_gem_cma_prime_import_sg_table, .gem_prime_export = drm_gem_prime_export, .gem_prime_get_sg_table = drm_gem_cma_prime_get_sg_table, + +#if defined(CONFIG_DEBUG_FS) + .debugfs_init = pl111_debugfs_init, +#endif }; #ifdef CONFIG_ARM_AMBA