From 13e3a512a29001cab68fe9a0c12be94e6d42a10c Mon Sep 17 00:00:00 2001 From: Jean Delvare Date: Tue, 14 Nov 2023 15:13:28 +0100 Subject: i2c: smbus: Support up to 8 SPD EEPROMs I originally restricted i2c_register_spd() to only support systems with up to 4 memory slots, so that we can experiment with it on a limited numbers of systems. It's been more than 3 years and it seems to work just fine, so the time has come to lift this arbitrary limitation. The maximum number of memory slots which can be connected to a single I2C segment is 8, so support that many SPD EEPROMs. Any system with more than 8 memory slots would have either multiple SMBus channels or SMBus multiplexing, so it would need dedicated care. We'll get to that later as needed. Signed-off-by: Jean Delvare Signed-off-by: Wolfram Sang --- drivers/i2c/i2c-smbus.c | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-) diff --git a/drivers/i2c/i2c-smbus.c b/drivers/i2c/i2c-smbus.c index 138c3f5e0093a5..74807c6db596d8 100644 --- a/drivers/i2c/i2c-smbus.c +++ b/drivers/i2c/i2c-smbus.c @@ -308,8 +308,8 @@ EXPORT_SYMBOL_GPL(i2c_free_slave_host_notify_device); * target systems are the same. * Restrictions to automatic SPD instantiation: * - Only works if all filled slots have the same memory type - * - Only works for DDR2, DDR3 and DDR4 for now - * - Only works on systems with 1 to 4 memory slots + * - Only works for DDR, DDR2, DDR3 and DDR4 for now + * - Only works on systems with 1 to 8 memory slots */ #if IS_ENABLED(CONFIG_DMI) void i2c_register_spd(struct i2c_adapter *adap) @@ -354,9 +354,9 @@ void i2c_register_spd(struct i2c_adapter *adap) dev_info(&adap->dev, "%d/%d memory slots populated (from DMI)\n", dimm_count, slot_count); - if (slot_count > 4) { + if (slot_count > 8) { dev_warn(&adap->dev, - "Systems with more than 4 memory slots not supported yet, not instantiating SPD\n"); + "Systems with more than 8 memory slots not supported yet, not instantiating SPD\n"); return; } -- cgit 1.2.3-korg