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Somebody in the thread at some point said:

|> Maybe the SPI timings are now even lower.  You might want to try that.
| What do I have to do?

In arch/arm/mach-s3c2440/mach_gta02.c there's this:

static struct spi_board_info gta02_spi_board_info[] = {
        {
                .modalias       = "jbt6k74",
                /* platform_data */
                .platform_data  = &jbt6k74_pdata,
                /* controller_data */
                /* irq */
                .max_speed_hz   = 10 * 1000 * 1000,
                .bus_num        = 2,
                /* chip_select */
        },
};

it means reduce the max_speed_hz from 10MHz to say 1MHz see if it
impacts it I guess.

- -Andy
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