[Intel-gfx] [PATCH 11/16] drm/i915: Init important ns2501 registers

[Thomas Richter]

On 15.08.2014 00:22, ville.syrjala at linux.intel.com wrote:
> From: Ville Syrjälä <ville.syrjala at linux.intel.com>
>
> In my earlier rewrite I missed a few important registers. Thomas Richter
> noticed that they're needed to make his machine resume correctly.
>
> Looks like IEGD does a one time init of these three registers. We don't
> have a good one time init place in the ns2501 driver, so let's just
> stick them into the .mode_set() hook and see if that helps things along.
>
> Signed-off-by: Ville Syrjälä <ville.syrjala at linux.intel.com>

Reviewed-by: Thomas Richter <richter at rus.uni-stuttgart.de>

> ---
>   drivers/gpu/drm/i915/dvo_ns2501.c | 10 ++++++++++
>   1 file changed, 10 insertions(+)
>
> diff --git a/drivers/gpu/drm/i915/dvo_ns2501.c b/drivers/gpu/drm/i915/dvo_ns2501.c
> index b278571..345235b 100644
> --- a/drivers/gpu/drm/i915/dvo_ns2501.c
> +++ b/drivers/gpu/drm/i915/dvo_ns2501.c
> @@ -342,6 +342,12 @@ static const struct ns2501_reg regs_1024x768[][86] = {
>   	},
>   };
>
> +static const struct ns2501_reg regs_init[] = {
> +	[0] = { .offset = 0x35, .value = 0xff, },
> +	[1] = { .offset = 0x34, .value = 0x00, },
> +	[2] = { .offset = 0x08, .value = 0x30, },
> +};
> +
>   struct ns2501_priv {
>   	bool quiet;
>   	const struct ns2501_reg *regs;
> @@ -544,6 +550,10 @@ static void ns2501_mode_set(struct intel_dvo_device *dvo,
>   	else
>   		return;
>
> +	/* Hopefully doing it every time won't hurt... */
> +	for (i = 0; i < ARRAY_SIZE(regs_init); i++)
> +		ns2501_writeb(dvo, regs_init[i].offset, regs_init[i].value);
> +
>   	ns->regs = regs_1024x768[mode_idx];
>
>   	for (i = 0; i < 84; i++)
>