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From: Vitor Soares <Vitor.Soares@synopsys.com>
To: linux-kernel@vger.kernel.org, devicetree@vger.kernel.org,
	linux-i3c@lists.infradead.org
Cc: mark.rutland@arm.com, Joao.Pinto@synopsys.com,
	bbrezillon@kernel.org, Vitor Soares <Vitor.Soares@synopsys.com>,
	pgaj@cadence.com, robh+dt@kernel.org
Subject: [PATCH v2 5/5] i3c: master: dw: reattach device on first available location of address table
Date: Tue,  3 Sep 2019 12:35:54 +0200
Message-ID: <594bce70368177256376fc2f592736db78cf40db.1567437955.git.vitor.soares@synopsys.com> (raw)
In-Reply-To: <cover.1567437955.git.vitor.soares@synopsys.com>

For today the reattach function only update the device address on the
controller.

Update the location to the first available too, will optimize the
enumeration process avoiding additional checks to keep the available
positions on address table consecutive.

Signed-off-by: Vitor Soares <vitor.soares@synopsys.com>
Reviewed-by: Boris Brezillon <boris.brezillon@collabora.com>
---
Change in v2:
  - Add Boris rb-tag

 drivers/i3c/master/dw-i3c-master.c | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/drivers/i3c/master/dw-i3c-master.c b/drivers/i3c/master/dw-i3c-master.c
index 1d83c97..62261ac 100644
--- a/drivers/i3c/master/dw-i3c-master.c
+++ b/drivers/i3c/master/dw-i3c-master.c
@@ -898,6 +898,22 @@ static int dw_i3c_master_reattach_i3c_dev(struct i3c_dev_desc *dev,
 	struct dw_i3c_i2c_dev_data *data = i3c_dev_get_master_data(dev);
 	struct i3c_master_controller *m = i3c_dev_get_master(dev);
 	struct dw_i3c_master *master = to_dw_i3c_master(m);
+	int pos;
+
+	pos = dw_i3c_master_get_free_pos(master);
+
+	if (data->index > pos && pos > 0) {
+		writel(0,
+		       master->regs +
+		       DEV_ADDR_TABLE_LOC(master->datstartaddr, data->index));
+
+		master->addrs[data->index] = 0;
+		master->free_pos |= BIT(data->index);
+
+		data->index = pos;
+		master->addrs[pos] = dev->info.dyn_addr;
+		master->free_pos &= ~BIT(pos);
+	}
 
 	writel(DEV_ADDR_TABLE_DYNAMIC_ADDR(dev->info.dyn_addr),
 	       master->regs +
-- 
2.7.4


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      parent reply index

Thread overview: 14+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-09-03 10:35 [PATCH v2 0/5] i3c: remove device if failed on pre_assign_dyn_addr() Vitor Soares
2019-09-03 10:35 ` [PATCH v2 1/5] i3c: master: detach and free device if pre_assign_dyn_addr() fails Vitor Soares
2019-09-03 10:52   ` Boris Brezillon
2019-09-03 11:10     ` Vitor Soares
2019-09-03 11:13   ` Przemyslaw Gaj
2019-09-03 11:57     ` Vitor Soares
2019-09-04  4:47       ` Przemyslaw Gaj
2019-09-04  9:06         ` Vitor Soares
2019-09-03 10:35 ` [PATCH v2 2/5] i3c: master: make sure ->boardinfo is initialized in add_i3c_dev_locked() Vitor Soares
2019-09-03 10:35 ` [PATCH v2 3/5] dt-bindings: i3c: Make 'assigned-address' valid if static address == 0 Vitor Soares
2019-09-03 17:40   ` Rob Herring
2019-09-03 10:35 ` [PATCH v2 4/5] dt-bindings: i3c: add a note for no guarantee of 'assigned-address' use Vitor Soares
2019-09-03 17:41   ` Rob Herring
2019-09-03 10:35 ` Vitor Soares [this message]

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