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CyberMind-FR
5c3afdd521
Created kernel patches to fix I2C timing issues with IS31FL319X LED controller on Marvell Armada platforms (errata FE-8471889): - 001-leds-is31fl319x-add-i2c-delays.patch: Adds 1ms delays between I2C register writes in LED driver to prevent bus errors - 002-i2c-mv64xxx-increase-errata-delay.patch: Increases mv64xxx errata delay from 5µs to 50µs for more reliable operation Updated .gitignore to track kernel-build/patches/ while still ignoring build outputs. Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
37 lines
1.2 KiB
Diff
37 lines
1.2 KiB
Diff
From: Gerald KERMA <devel@cybermind.fr>
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Subject: i2c: mv64xxx: increase errata delay for reliable operation
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Increase the errata FE-8471889 delay from 5us to 50us for more reliable
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I2C operation on Marvell Armada platforms. The original 5us delay is
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sometimes insufficient when working with slow I2C devices like LED
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controllers (IS31FL319X) that require additional setup time.
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This delay is only applied in standard mode (100kHz) for compatible
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devices (marvell,mv78230-i2c and marvell,mv78230-a0-i2c).
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Signed-off-by: Gerald KERMA <devel@cybermind.fr>
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---
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drivers/i2c/busses/i2c-mv64xxx.c | 4 ++--
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1 file changed, 2 insertions(+), 2 deletions(-)
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--- a/drivers/i2c/busses/i2c-mv64xxx.c
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+++ b/drivers/i2c/busses/i2c-mv64xxx.c
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@@ -340,7 +340,7 @@ mv64xxx_i2c_do_action(struct mv64xxx_i2c_data *drv_data)
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drv_data->state = MV64XXX_I2C_STATE_WAITING_FOR_START_COND;
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if (drv_data->errata_delay)
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- udelay(5);
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+ udelay(50);
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drv_data->state = MV64XXX_I2C_STATE_IDLE;
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}
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@@ -502,7 +502,7 @@ mv64xxx_i2c_send_start(struct mv64xxx_i2c_data *drv_data)
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drv_data->state = MV64XXX_I2C_STATE_WAITING_FOR_START_COND;
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if (drv_data->errata_delay)
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- udelay(5);
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+ udelay(50);
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}
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static void
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