diff options
Diffstat (limited to 'target/linux/bcm27xx/patches-5.4/950-0265-i2c-bcm2835-Set-clock-stretch-timeout-to-35ms.patch')
| -rw-r--r-- | target/linux/bcm27xx/patches-5.4/950-0265-i2c-bcm2835-Set-clock-stretch-timeout-to-35ms.patch | 47 |
1 files changed, 0 insertions, 47 deletions
diff --git a/target/linux/bcm27xx/patches-5.4/950-0265-i2c-bcm2835-Set-clock-stretch-timeout-to-35ms.patch b/target/linux/bcm27xx/patches-5.4/950-0265-i2c-bcm2835-Set-clock-stretch-timeout-to-35ms.patch deleted file mode 100644 index a3bc6c91b6..0000000000 --- a/target/linux/bcm27xx/patches-5.4/950-0265-i2c-bcm2835-Set-clock-stretch-timeout-to-35ms.patch +++ /dev/null @@ -1,47 +0,0 @@ -From 9c64858d41cc65982aaf36866ffa8e04b9792718 Mon Sep 17 00:00:00 2001 -From: Phil Elwell <phil@raspberrypi.org> -Date: Fri, 12 Jul 2019 15:38:35 +0100 -Subject: [PATCH] i2c: bcm2835: Set clock-stretch timeout to 35ms - -The BCM2835 I2C blocks have a register to set the clock-stretch -timeout - how long the device is allowed to hold SCL low - in bus -cycles. The current driver doesn't write to the register, therefore -the default value of 64 cycles is being used for all devices. - -Set the timeout to the value recommended for SMBus - 35ms. - -See: https://github.com/raspberrypi/linux/issues/3064 - -Signed-off-by: Phil Elwell <phil@raspberrypi.org> ---- - drivers/i2c/busses/i2c-bcm2835.c | 12 ++++++++++++ - 1 file changed, 12 insertions(+) - ---- a/drivers/i2c/busses/i2c-bcm2835.c -+++ b/drivers/i2c/busses/i2c-bcm2835.c -@@ -188,6 +188,7 @@ static int clk_bcm2835_i2c_set_rate(stru - { - struct clk_bcm2835_i2c *div = to_clk_bcm2835_i2c(hw); - u32 redl, fedl; -+ u32 clk_tout; - u32 divider = clk_bcm2835_i2c_calc_divider(rate, parent_rate); - - if (divider == -EINVAL) -@@ -211,6 +212,17 @@ static int clk_bcm2835_i2c_set_rate(stru - bcm2835_i2c_writel(div->i2c_dev, BCM2835_I2C_DEL, - (fedl << BCM2835_I2C_FEDL_SHIFT) | - (redl << BCM2835_I2C_REDL_SHIFT)); -+ -+ /* -+ * Set the clock stretch timeout to the SMBUs-recommended 35ms. -+ */ -+ if (rate > 0xffff*1000/35) -+ clk_tout = 0xffff; -+ else -+ clk_tout = 35*rate/1000; -+ -+ bcm2835_i2c_writel(div->i2c_dev, BCM2835_I2C_CLKT, clk_tout); -+ - return 0; - } - |