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Commit 141518d2 authored by Eric Anholt's avatar Eric Anholt
Browse files

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: default avatarEric 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)
parent 3719a5ad

drivers/gpu/drm/pl111/Makefile

+2 −0
Original line number Diff line number Diff line
@@ -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

drivers/gpu/drm/pl111/pl111_debugfs.c

0 → 100644
+55 −0
Original line number Diff line number Diff line 
/*

 *  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);

}

drivers/gpu/drm/pl111/pl111_drm.h

+3 −0
Original line number Diff line number Diff line
@@ -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 *dev); 
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_ */

drivers/gpu/drm/pl111/pl111_drv.c

+4 −0
Original line number Diff line number Diff line
@@ -173,6 +173,10 @@ static struct drm_driver pl111_drm_driver = { 
	.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