[PATCH] drm/i915/display: Consider adjusted_pixel_rate to be u64

[Jani Nikula]

On Fri, 21 Jun 2024, Mitul Golani <mitulkumar.ajitkumar.golani at intel.com> wrote:
> Consider adjusted_pixel_rate to be a u64 to match the return
> type of mul_u32_u32() and avoid any compiler dependency for
> do_div.

You should mention this fixes 32-bit builds. Might also want to give a
link to the actual build failure, and give credit to the reporter:

Closes: https://lore.kernel.org/r/20240619154207.GA1125704@thelio-3990X
Reported-by: Nathan Chancellor <nathan at kernel.org>

>
> Fixes: 1676ecd303ac ("drm/i915: Compute CMRR and calculate vtotal")
> Cc: Mitul Golani <mitulkumar.ajitkumar.golani at intel.com>
> Cc: Ankit Nautiyal <ankit.k.nautiyal at intel.com>
> Cc: Suraj Kandpal <suraj.kandpal at intel.com>
> Cc: Jani Nikula <jani.nikula at linux.intel.com>
> Cc: Rodrigo Vivi <rodrigo.vivi at intel.com>
> Cc: Nathan Chancellor <nathan at kernel.org>
> Cc: intel-xe at lists.freedesktop.org
> Signed-off-by: Mitul Golani <mitulkumar.ajitkumar.golani at intel.com>
> ---
>  drivers/gpu/drm/i915/display/intel_vrr.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/i915/display/intel_vrr.c b/drivers/gpu/drm/i915/display/intel_vrr.c
> index 6430da25957d..5a0da64c7db3 100644
> --- a/drivers/gpu/drm/i915/display/intel_vrr.c
> +++ b/drivers/gpu/drm/i915/display/intel_vrr.c
> @@ -137,7 +137,7 @@ static unsigned int
>  cmrr_get_vtotal(struct intel_crtc_state *crtc_state, bool video_mode_required)
>  {
>  	int multiplier_m = 1, multiplier_n = 1, vtotal, desired_refresh_rate;
> -	long long adjusted_pixel_rate;
> +	u64 adjusted_pixel_rate;
>  	struct drm_display_mode *adjusted_mode = &crtc_state->hw.adjusted_mode;
>  
>  	desired_refresh_rate = drm_mode_vrefresh(adjusted_mode);

-- 
Jani Nikula, Intel