linux-kernel - [PATCH v2] i3c: dw: Fix IBI intr programming

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Date: Fri,  7 Jun 2024 07:20:30 +0000
From: Aniket <aniketmaurya@...gle.com>
To: Alexandre Belloni <alexandre.belloni@...tlin.com>, Jeremy Kerr <jk@...econstruct.com.au>, 
	Joel Stanley <joel@....id.au>, Billy Tsai <billy_tsai@...eedtech.com>
Cc: linux-i3c@...ts.infradead.org, linux-kernel@...r.kernel.org, 
	Aniket <aniketmaurya@...gle.com>
Subject: [PATCH v2] i3c: dw: Fix IBI intr programming

IBI_SIR_REQ_REJECT register is not present if the IP has
IC_HAS_IBI_DATA = 1 set. So don't rely on doing read-
modify-write op on this register.
Instead maintain a variable to store the sir reject mask
and use it to set IBI_SIR_REQ_REJECT.

Signed-off-by: Aniket <aniketmaurya@...gle.com>
---
 changed from v1 to v2
	- replaced counter with the mask
 drivers/i3c/master/dw-i3c-master.c | 15 ++++++++-------
 drivers/i3c/master/dw-i3c-master.h |  2 +-
 2 files changed, 9 insertions(+), 8 deletions(-)

diff --git a/drivers/i3c/master/dw-i3c-master.c b/drivers/i3c/master/dw-i3c-master.c
index 0ec00e644bd4..03911a5c0264 100644
--- a/drivers/i3c/master/dw-i3c-master.c
+++ b/drivers/i3c/master/dw-i3c-master.c
@@ -658,7 +658,9 @@ static int dw_i3c_master_bus_init(struct i3c_master_controller *m)
 	if (ret)
 		return ret;
 
-	writel(IBI_REQ_REJECT_ALL, master->regs + IBI_SIR_REQ_REJECT);
+	master->sir_rej_mask = IBI_REQ_REJECT_ALL;
+	writel(master->sir_rej_mask, master->regs + IBI_SIR_REQ_REJECT);
+
 	writel(IBI_REQ_REJECT_ALL, master->regs + IBI_MR_REQ_REJECT);
 
 	/* For now don't support Hot-Join */
@@ -1175,17 +1177,16 @@ static void dw_i3c_master_set_sir_enabled(struct dw_i3c_master *master,
 	master->platform_ops->set_dat_ibi(master, dev, enable, &reg);
 	writel(reg, master->regs + dat_entry);
 
-	reg = readl(master->regs + IBI_SIR_REQ_REJECT);
 	if (enable) {
-		global = reg == 0xffffffff;
-		reg &= ~BIT(idx);
+		global = (master->sir_rej_mask == IBI_REQ_REJECT_ALL);
+		master->sir_rej_mask &= ~BIT(idx);
 	} else {
 		bool hj_rejected = !!(readl(master->regs + DEVICE_CTRL) & DEV_CTRL_HOT_JOIN_NACK);
 
-		reg |= BIT(idx);
-		global = (reg == 0xffffffff) && hj_rejected;
+		master->sir_rej_mask |= BIT(idx);
+		global = (master->sir_rej_mask == IBI_REQ_REJECT_ALL) && hj_rejected;
 	}
-	writel(reg, master->regs + IBI_SIR_REQ_REJECT);
+	writel(master->sir_rej_mask, master->regs + IBI_SIR_REQ_REJECT);
 
 	if (global)
 		dw_i3c_master_enable_sir_signal(master, enable);
diff --git a/drivers/i3c/master/dw-i3c-master.h b/drivers/i3c/master/dw-i3c-master.h
index 4ab94aa72252..8cb617b8147e 100644
--- a/drivers/i3c/master/dw-i3c-master.h
+++ b/drivers/i3c/master/dw-i3c-master.h
@@ -39,7 +39,7 @@ struct dw_i3c_master {
 	char version[5];
 	char type[5];
 	bool ibi_capable;
-
+	u32 sir_rej_mask;
 	/*
 	 * Per-device hardware data, used to manage the device address table
 	 * (DAT)
-- 
2.45.2.505.gda0bf45e8d-goog