From 66b32e3d2c6daeeafb80fa41f3a41e4c0ab85cc6 Mon Sep 17 00:00:00 2001 From: Jeremy Kerr Date: Thu, 30 Mar 2023 14:15:33 +0800 Subject: [PATCH] i3c: dw: use bus mode rather than device reg for conditional tCAS setting In the clock setup path, we set the hardware DEV_CTRL_I2C_SLAVE_PRESENT bit on a shared mode bus, then read-back this bit for the conditional tCAS set. Instead, just use the bus->mode setting for the conditional test. While we're at it, add a little comment about why the conditional is there. Signed-off-by: Jeremy Kerr Link: https://lore.kernel.org/r/92a933566f7846708a00ad7f5a16ee8e6ed32d0e.1680156630.git.jk@codeconstruct.com.au Signed-off-by: Alexandre Belloni --- drivers/i3c/master/dw-i3c-master.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) diff --git a/drivers/i3c/master/dw-i3c-master.c b/drivers/i3c/master/dw-i3c-master.c index e95d73e71574..9ae2e5b2723f 100644 --- a/drivers/i3c/master/dw-i3c-master.c +++ b/drivers/i3c/master/dw-i3c-master.c @@ -538,7 +538,11 @@ static int dw_i3c_clk_cfg(struct dw_i3c_master *master) scl_timing = SCL_I3C_TIMING_HCNT(hcnt) | SCL_I3C_TIMING_LCNT(lcnt); writel(scl_timing, master->regs + SCL_I3C_PP_TIMING); - if (!(readl(master->regs + DEVICE_CTRL) & DEV_CTRL_I2C_SLAVE_PRESENT)) + /* + * In pure i3c mode, MST_FREE represents tCAS. In shared mode, this + * will be set up by dw_i2c_clk_cfg as tLOW. + */ + if (master->base.bus.mode == I3C_BUS_MODE_PURE) writel(BUS_I3C_MST_FREE(lcnt), master->regs + BUS_FREE_TIMING); lcnt = max_t(u8,