On Mon, 02 Dec 2019, Chandan Uddaraju <chandanu@xxxxxxxxxxxxxx> wrote:
> The constant N value (0x8000) is used by multiple DP
> drivers. Define this value in header file and use this
> in the existing i915 display driver.
>
> Signed-off-by: Chandan Uddaraju <chandanu@xxxxxxxxxxxxxx>
Reviewed-by: Jani Nikula <jani.nikula@xxxxxxxxx>
and ack for merging via drm-misc or whichever tree you find suitable.
> ---
> drivers/gpu/drm/i915/display/intel_display.c | 2 +-
> include/drm/drm_dp_helper.h | 1 +
> 2 files changed, 2 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/i915/display/intel_display.c b/drivers/gpu/drm/i915/display/intel_display.c
> index ce05e80..1a4ccfd 100644
> --- a/drivers/gpu/drm/i915/display/intel_display.c
> +++ b/drivers/gpu/drm/i915/display/intel_display.c
> @@ -7496,7 +7496,7 @@ static void compute_m_n(unsigned int m, unsigned int n,
> * which the devices expect also in synchronous clock mode.
> */
> if (constant_n)
> - *ret_n = 0x8000;
> + *ret_n = DP_LINK_CONSTANT_N_VALUE;
> else
> *ret_n = min_t(unsigned int, roundup_pow_of_two(n), DATA_LINK_N_MAX);
>
> diff --git a/include/drm/drm_dp_helper.h b/include/drm/drm_dp_helper.h
> index 8364502..69b8251 100644
> --- a/include/drm/drm_dp_helper.h
> +++ b/include/drm/drm_dp_helper.h
> @@ -1357,6 +1357,7 @@ int drm_dp_dpcd_read_link_status(struct drm_dp_aux *aux,
> * DisplayPort link
> */
> #define DP_LINK_CAP_ENHANCED_FRAMING (1 << 0)
> +#define DP_LINK_CONSTANT_N_VALUE 0x8000
>
> struct drm_dp_link {
> unsigned char revision;
--
Jani Nikula, Intel Open Source Graphics Center
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