From 58e7b1d5826ac6a64b1101d8a70162bc084a7d1e Mon Sep 17 00:00:00 2001 From: Ludovic Desroches Date: Fri, 22 Nov 2013 17:08:43 +0100 Subject: [PATCH] ARM: at91: sama5d3: reduce TWI internal clock frequency With some devices, transfer hangs during I2C frame transmission. This issue disappears when reducing the internal frequency of the TWI IP. Even if it is indicated that internal clock max frequency is 66MHz, it seems we have oversampling on I2C signals making TWI believe that a transfer in progress is done. This fix has no impact on the I2C bus frequency. Cc: #3.10+ Signed-off-by: Ludovic Desroches Acked-by: Wolfram Sang Acked-by: Jean-Christophe PLAGNIOL-VILLARD Signed-off-by: Nicolas Ferre --- arch/arm/mach-at91/sama5d3.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) diff --git a/arch/arm/mach-at91/sama5d3.c b/arch/arm/mach-at91/sama5d3.c index 3ea86428ee0964..a28873fe304913 100644 --- a/arch/arm/mach-at91/sama5d3.c +++ b/arch/arm/mach-at91/sama5d3.c @@ -95,19 +95,19 @@ static struct clk twi0_clk = { .name = "twi0_clk", .pid = SAMA5D3_ID_TWI0, .type = CLK_TYPE_PERIPHERAL, - .div = AT91_PMC_PCR_DIV2, + .div = AT91_PMC_PCR_DIV8, }; static struct clk twi1_clk = { .name = "twi1_clk", .pid = SAMA5D3_ID_TWI1, .type = CLK_TYPE_PERIPHERAL, - .div = AT91_PMC_PCR_DIV2, + .div = AT91_PMC_PCR_DIV8, }; static struct clk twi2_clk = { .name = "twi2_clk", .pid = SAMA5D3_ID_TWI2, .type = CLK_TYPE_PERIPHERAL, - .div = AT91_PMC_PCR_DIV2, + .div = AT91_PMC_PCR_DIV8, }; static struct clk mmc0_clk = { .name = "mci0_clk",