On Wednesday, February 18, 2015 01:50:17 PM Mika Westerberg wrote:
> On some Braswell systems BIOS leaves resets for SPI host controllers
> active. This prevents the SPI driver from transferring messages on wire.
>
> Fix this in similar way that we do for I2C already by deasserting resets
> for the SPI host controllers.
>
> Reported-by: Yang A Fang <[email protected]>
> Signed-off-by: Mika Westerberg <[email protected]>
OK, so these two would need to go into "stable" I suppose?
What "stable" series we need them to go into?
> ---
> drivers/acpi/acpi_lpss.c | 19 +++++++++++++++----
> 1 file changed, 15 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/acpi/acpi_lpss.c b/drivers/acpi/acpi_lpss.c
> index 64ccc3bb0826..7d5880ded78a 100644
> --- a/drivers/acpi/acpi_lpss.c
> +++ b/drivers/acpi/acpi_lpss.c
> @@ -105,9 +105,7 @@ static void lpss_uart_setup(struct lpss_private_data
> *pdata)
> }
> }
>
> -#define LPSS_I2C_ENABLE 0x6c
> -
> -static void byt_i2c_setup(struct lpss_private_data *pdata)
> +static void lpss_deassert_reset(struct lpss_private_data *pdata)
> {
> unsigned int offset;
> u32 val;
> @@ -116,6 +114,13 @@ static void byt_i2c_setup(struct lpss_private_data
> *pdata)
> val = readl(pdata->mmio_base + offset);
> val |= LPSS_RESETS_RESET_APB | LPSS_RESETS_RESET_FUNC;
> writel(val, pdata->mmio_base + offset);
> +}
> +
> +#define LPSS_I2C_ENABLE 0x6c
> +
> +static void byt_i2c_setup(struct lpss_private_data *pdata)
> +{
> + lpss_deassert_reset(pdata);
>
> if (readl(pdata->mmio_base + pdata->dev_desc->prv_offset))
> pdata->fixed_clk_rate = 133000000;
> @@ -170,6 +175,12 @@ static struct lpss_device_desc byt_i2c_dev_desc = {
> .setup = byt_i2c_setup,
> };
>
> +static struct lpss_device_desc bsw_spi_dev_desc = {
> + .flags = LPSS_CLK | LPSS_CLK_GATE | LPSS_CLK_DIVIDER | LPSS_SAVE_CTX,
> + .prv_offset = 0x400,
> + .setup = lpss_deassert_reset,
> +};
> +
> #else
>
> #define LPSS_ADDR(desc) (0UL)
> @@ -202,7 +213,7 @@ static const struct acpi_device_id acpi_lpss_device_ids[]
> = {
> /* Braswell LPSS devices */
> { "80862288", LPSS_ADDR(byt_pwm_dev_desc) },
> { "8086228A", LPSS_ADDR(byt_uart_dev_desc) },
> - { "8086228E", LPSS_ADDR(byt_spi_dev_desc) },
> + { "8086228E", LPSS_ADDR(bsw_spi_dev_desc) },
> { "808622C1", LPSS_ADDR(byt_i2c_dev_desc) },
>
> { "INT3430", LPSS_ADDR(lpt_dev_desc) },
>
--
I speak only for myself.
Rafael J. Wysocki, Intel Open Source Technology Center.
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