linux-kernel - [PATCH] regmap: regmap-irq: Remove default irq type setting from core

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Date:   Tue, 18 Dec 2018 12:58:13 +0200
From:   Matti Vaittinen <matti.vaittinen@...rohmeurope.com>
To:     matti.vaittinen@...rohmeurope.com, mazziesaccount@...il.com
Cc:     broonie@...nel.org, gregkh@...uxfoundation.org, rafael@...nel.org,
        ldewangan@...dia.com, linux-kernel@...r.kernel.org
Subject: [PATCH] regmap: regmap-irq: Remove default irq type setting from core

The common code should not set IRQ type. Read HW defaults to the
cache at startup instead of forcing type to EDGE_BOTH. If
default setting is needed this should be done via normal
mechanisms or by chip specific code if normal mechanisms are not
suitable for some reason. Common regmap-irq code should not have
defaults hard-coded but keep the HW/boot defaults untouched.

Signed-off-by: Matti Vaittinen <matti.vaittinen@...rohmeurope.com>
---
So let's try removing the hard-coded default setting from generic
regmap-irq code as discussed with Mark here:
https://lore.kernel.org/lkml/20181217180722.GG27909@sirena.org.uk/

Core code should not care about the default trigger level - such
settings should be done by code which knows the target
platform/board.

I was not able to test this change as I have no max77620 which seems to
be the only user of regmap-irq type-setting in tree as of now.

The patch was created on top of the regulator-next tree, with
"regmap: irq: handle HW using separate rising/falling edge interrupts"
from Bartosz Golaszewski cherry-picked. This should still cleanly apply
on regmap-tree.

 drivers/base/regmap/regmap-irq.c | 22 ++++++++--------------
 1 file changed, 8 insertions(+), 14 deletions(-)

diff --git a/drivers/base/regmap/regmap-irq.c b/drivers/base/regmap/regmap-irq.c
index 603b1554f81c..8b216b2e2c19 100644
--- a/drivers/base/regmap/regmap-irq.c
+++ b/drivers/base/regmap/regmap-irq.c
@@ -625,26 +625,20 @@ int regmap_add_irq_chip(struct regmap *map, int irq, int irq_flags,
 	}
 
 	if (chip->num_type_reg && !chip->type_in_mask) {
-		for (i = 0; i < chip->num_irqs; i++) {
-			reg = chip->irqs[i].type_reg_offset / map->reg_stride;
-			d->type_buf_def[reg] |= chip->irqs[i].type_rising_mask |
-					chip->irqs[i].type_falling_mask;
-		}
 		for (i = 0; i < chip->num_type_reg; ++i) {
 			if (!d->type_buf_def[i])
 				continue;
 
 			reg = chip->type_base +
 				(i * map->reg_stride * d->type_reg_stride);
-			if (chip->type_invert)
-				ret = regmap_irq_update_bits(d, reg,
-					d->type_buf_def[i], 0xFF);
-			else
-				ret = regmap_irq_update_bits(d, reg,
-					d->type_buf_def[i], 0x0);
-			if (ret != 0) {
-				dev_err(map->dev,
-					"Failed to set type in 0x%x: %x\n",
+
+			ret = regmap_read(map, reg, &d->type_buf_def[i]);
+
+			if (d->chip->type_invert)
+				d->type_buf_def[i] = ~d->type_buf_def[i];
+
+			if (ret) {
+				dev_err(map->dev, "Failed to get type defaults at 0x%x: %d\n",
 					reg, ret);
 				goto err_alloc;
 			}
-- 
2.14.3


-- 
Matti Vaittinen
ROHM Semiconductors

~~~ "I don't think so," said Rene Descartes.  Just then, he vanished ~~~