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drm/pl111: Add a debugfs node to dump our registers.
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 <eric@anholt.net> Link: http://patchwork.freedesktop.org/patch/msgid/20170518005640.10310-1-eric@anholt.net Reviewed-by: Linus Walleij <linus.walleij@linaro.org> (v1)
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4 changed files with 64 additions and 0 deletions
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@ -2,4 +2,6 @@ pl111_drm-y += pl111_connector.o \
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pl111_display.o \
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pl111_drv.o
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pl111_drm-$(CONFIG_DEBUG_FS) += pl111_debugfs.o
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obj-$(CONFIG_DRM_PL111) += pl111_drm.o
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55
drivers/gpu/drm/pl111/pl111_debugfs.c
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55
drivers/gpu/drm/pl111/pl111_debugfs.c
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@ -0,0 +1,55 @@
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/*
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* Copyright © 2017 Broadcom
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/amba/clcd-regs.h>
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#include <linux/seq_file.h>
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#include <drm/drm_debugfs.h>
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#include <drm/drmP.h>
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#include "pl111_drm.h"
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#define REGDEF(reg) { reg, #reg }
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static const struct {
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u32 reg;
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const char *name;
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} pl111_reg_defs[] = {
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REGDEF(CLCD_TIM0),
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REGDEF(CLCD_TIM1),
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REGDEF(CLCD_TIM2),
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REGDEF(CLCD_TIM3),
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REGDEF(CLCD_UBAS),
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REGDEF(CLCD_PL111_CNTL),
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REGDEF(CLCD_PL111_IENB),
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};
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int pl111_debugfs_regs(struct seq_file *m, void *unused)
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{
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struct drm_info_node *node = (struct drm_info_node *)m->private;
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struct drm_device *dev = node->minor->dev;
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struct pl111_drm_dev_private *priv = dev->dev_private;
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int i;
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for (i = 0; i < ARRAY_SIZE(pl111_reg_defs); i++) {
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seq_printf(m, "%s (0x%04x): 0x%08x\n",
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pl111_reg_defs[i].name, pl111_reg_defs[i].reg,
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readl(priv->regs + pl111_reg_defs[i].reg));
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}
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return 0;
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}
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static const struct drm_info_list pl111_debugfs_list[] = {
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{"regs", pl111_debugfs_regs, 0},
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};
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int
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pl111_debugfs_init(struct drm_minor *minor)
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{
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return drm_debugfs_create_files(pl111_debugfs_list,
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ARRAY_SIZE(pl111_debugfs_list),
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minor->debugfs_root, minor);
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}
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@ -25,6 +25,8 @@
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#define CLCD_IRQ_NEXTBASE_UPDATE BIT(2)
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struct drm_minor;
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struct pl111_drm_connector {
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struct drm_connector connector;
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struct drm_panel *panel;
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@ -60,5 +62,6 @@ int pl111_encoder_init(struct drm_device *dev);
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int pl111_dumb_create(struct drm_file *file_priv,
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struct drm_device *dev,
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struct drm_mode_create_dumb *args);
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int pl111_debugfs_init(struct drm_minor *minor);
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#endif /* _PL111_DRM_H_ */
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@ -173,6 +173,10 @@ static struct drm_driver pl111_drm_driver = {
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.gem_prime_import_sg_table = drm_gem_cma_prime_import_sg_table,
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.gem_prime_export = drm_gem_prime_export,
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.gem_prime_get_sg_table = drm_gem_cma_prime_get_sg_table,
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#if defined(CONFIG_DEBUG_FS)
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.debugfs_init = pl111_debugfs_init,
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#endif
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};
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#ifdef CONFIG_ARM_AMBA
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