On 17:08 Fri 22 Nov , ludovic.desroches@xxxxxxxxx wrote:
> From: Ludovic Desroches <ludovic.desroches@xxxxxxxxx>
>
> 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.
so now the IP run a 16MHz
you could also mention that now we save power too
Acked-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@xxxxxxxxxxxx>
Best Regards,
J.
>
> This fix has no impact on the I2C bus frequency.
>
> Cc: <stable@xxxxxxxxxxxxxxx> #3.10+
> Acked-by: Nicolas Ferre <nicolas.ferre@xxxxxxxxx>
> Signed-off-by: Ludovic Desroches <ludovic.desroches@xxxxxxxxx>
> ---
>
> v2: update commit message
>
> 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 4012797..4ee0de5 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",
> --
> 1.7.9.5
>
--
To unsubscribe from this list: send the line "unsubscribe linux-i2c" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
