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drm/pl111: Add a debugfs node to dump our registers.

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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)
This commit is contained in:
Eric Anholt
2017-05-17 17:56:40 -07:00
parent 3719a5adbb
commit 141518d234
4 changed files with 64 additions and 0 deletions
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55
drivers/gpu/drm/pl111/pl111_debugfs.c Normal file
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/*
* 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 <linux/amba/clcd-regs.h>
#include <linux/seq_file.h>
#include <drm/drm_debugfs.h>
#include <drm/drmP.h>
#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);
}