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Message-ID: <63e1b42ad7b3ce32f266aea7814304123bad151c.1763703573.git.adrianhoyin.ng@altera.com> Date: Fri, 21 Nov 2025 14:21:50 +0800 From: adrianhoyin.ng@...era.com To: alexandre.belloni@...tlin.com, Frank.Li@....com, linux-i3c@...ts.infradead.org, linux-kernel@...r.kernel.org Cc: adrianhoyin.ng@...era.com Subject: [PATCH v2 3/3] i3c: dw: Preserve DAT entry bits when restoring addresses From: Adrian Ng Ho Yin <adrianhoyin.ng@...era.com> Update dw_i3c_master_restore_addrs() to preserve existing bits in each Device Address Table (DAT) entry when restoring addresses. This prevents overwriting configuration bits during PM runtime resumes. Signed-off-by: Adrian Ng Ho Yin <adrianhoyin.ng@...era.com> --- drivers/i3c/master/dw-i3c-master.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) diff --git a/drivers/i3c/master/dw-i3c-master.c b/drivers/i3c/master/dw-i3c-master.c index c43eba615d8a..ac3c2d3136d0 100644 --- a/drivers/i3c/master/dw-i3c-master.c +++ b/drivers/i3c/master/dw-i3c-master.c @@ -1718,11 +1718,13 @@ static void dw_i3c_master_restore_addrs(struct dw_i3c_master *master) if (master->free_pos & BIT(pos)) continue; + reg_val = readl(master->regs + DEV_ADDR_TABLE_LOC(master->datstartaddr, pos)); + if (master->devs[pos].is_i2c_addr) - reg_val = DEV_ADDR_TABLE_LEGACY_I2C_DEV | + reg_val |= DEV_ADDR_TABLE_LEGACY_I2C_DEV | DEV_ADDR_TABLE_STATIC_ADDR(master->devs[pos].addr); else - reg_val = DEV_ADDR_TABLE_DYNAMIC_ADDR(master->devs[pos].addr); + reg_val |= DEV_ADDR_TABLE_DYNAMIC_ADDR(master->devs[pos].addr); writel(reg_val, master->regs + DEV_ADDR_TABLE_LOC(master->datstartaddr, pos)); } -- 2.49.GIT
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