mirror of
git://git.openwrt.org/openwrt/openwrt.git
synced 2025-11-03 22:44:27 -05:00
487ca61f91
Changelog: https://cdn.kernel.org/pub/linux/kernel/v6.x/ChangeLog-6.6.61 Manually rebased: bcm27xx/patches-6.6/950-0998-i2c-designware-Add-support-for-bus-clear-feature.patch All other patches automatically rebased. Build system: x86/64 Build-tested: x86/64/AMD Cezanne, flogic/xiaomi_redmi-router-ax6000-ubootmod, ramips/tplink_archer-a6-v3 Run-tested: x86/64/AMD Cezanne, flogic/xiaomi_redmi-router-ax6000-ubootmod, ramips/tplink_archer-a6-v3 Signed-off-by: John Audia <therealgraysky@proton.me> Link: https://github.com/openwrt/openwrt/pull/16959 Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
81 lines
2.7 KiB
Diff
81 lines
2.7 KiB
Diff
From cea76e589d797371e4259027451bc279a10d550a Mon Sep 17 00:00:00 2001
|
|
From: Phil Elwell <phil@raspberrypi.com>
|
|
Date: Tue, 16 Jan 2024 16:03:14 +0000
|
|
Subject: [PATCH 0864/1085] i2c: designware: Support non-standard bus speeds
|
|
|
|
Add support for non-standard bus speeds by treating them as detuned
|
|
versions of the slowest standard speed not less than the requested
|
|
speed.
|
|
|
|
Signed-off-by: Phil Elwell <phil@raspberrypi.com>
|
|
---
|
|
drivers/i2c/busses/i2c-designware-common.c | 27 ++++++++++++++++++++++
|
|
drivers/i2c/busses/i2c-designware-core.h | 1 +
|
|
drivers/i2c/busses/i2c-designware-master.c | 2 +-
|
|
3 files changed, 29 insertions(+), 1 deletion(-)
|
|
|
|
--- a/drivers/i2c/busses/i2c-designware-common.c
|
|
+++ b/drivers/i2c/busses/i2c-designware-common.c
|
|
@@ -318,6 +318,9 @@ void i2c_dw_adjust_bus_speed(struct dw_i
|
|
{
|
|
u32 acpi_speed = i2c_dw_acpi_round_bus_speed(dev->dev);
|
|
struct i2c_timings *t = &dev->timings;
|
|
+ u32 wanted_speed;
|
|
+ u32 legal_speed = 0;
|
|
+ int i;
|
|
|
|
/*
|
|
* Find bus speed from the "clock-frequency" device property, ACPI
|
|
@@ -329,6 +332,30 @@ void i2c_dw_adjust_bus_speed(struct dw_i
|
|
t->bus_freq_hz = max(t->bus_freq_hz, acpi_speed);
|
|
else
|
|
t->bus_freq_hz = I2C_MAX_FAST_MODE_FREQ;
|
|
+
|
|
+ wanted_speed = t->bus_freq_hz;
|
|
+
|
|
+ /* For unsupported speeds, scale down the lowest speed which is faster. */
|
|
+ for (i = 0; i < ARRAY_SIZE(supported_speeds); i++) {
|
|
+ /* supported speeds is in decreasing order */
|
|
+ if (wanted_speed == supported_speeds[i]) {
|
|
+ legal_speed = 0;
|
|
+ break;
|
|
+ }
|
|
+ if (wanted_speed > supported_speeds[i])
|
|
+ break;
|
|
+
|
|
+ legal_speed = supported_speeds[i];
|
|
+ }
|
|
+
|
|
+ if (legal_speed) {
|
|
+ /*
|
|
+ * Pretend this was the requested speed, but preserve the preferred
|
|
+ * speed so the clock counts can be scaled.
|
|
+ */
|
|
+ t->bus_freq_hz = legal_speed;
|
|
+ dev->wanted_bus_speed = wanted_speed;
|
|
+ }
|
|
}
|
|
EXPORT_SYMBOL_GPL(i2c_dw_adjust_bus_speed);
|
|
|
|
--- a/drivers/i2c/busses/i2c-designware-core.h
|
|
+++ b/drivers/i2c/busses/i2c-designware-core.h
|
|
@@ -293,6 +293,7 @@ struct dw_i2c_dev {
|
|
u16 fp_lcnt;
|
|
u16 hs_hcnt;
|
|
u16 hs_lcnt;
|
|
+ u32 wanted_bus_speed;
|
|
int (*acquire_lock)(void);
|
|
void (*release_lock)(void);
|
|
int semaphore_idx;
|
|
--- a/drivers/i2c/busses/i2c-designware-master.c
|
|
+++ b/drivers/i2c/busses/i2c-designware-master.c
|
|
@@ -41,7 +41,7 @@ static void i2c_dw_configure_fifo_master
|
|
static u16 clock_calc(struct dw_i2c_dev *dev, bool want_high)
|
|
{
|
|
struct i2c_timings *t = &dev->timings;
|
|
- u32 wanted_speed = t->bus_freq_hz;
|
|
+ u32 wanted_speed = dev->wanted_bus_speed ?: t->bus_freq_hz;
|
|
u32 clk_khz = i2c_dw_clk_rate(dev);
|
|
u32 extra_ns = want_high ? t->scl_fall_ns : t->scl_rise_ns;
|
|
u32 extra_cycles = (u32)div_u64((u64)clk_khz * extra_ns, 1000000);
|