On Fri, Sep 27, 2024 at 02:08:25PM +0530, Ankit Nautiyal wrote:
> Currently compressed max_bpp limitations for small joiner ram, big joiner
> and others are intermingled. Separate them into distinct functions to
> enhance clarity and maintainability.
>
> Signed-off-by: Ankit Nautiyal <[email protected]>
> ---
> drivers/gpu/drm/i915/display/intel_dp.c | 45 ++++++++++++++++++++-----
> 1 file changed, 37 insertions(+), 8 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/display/intel_dp.c
> b/drivers/gpu/drm/i915/display/intel_dp.c
> index f2a2541c1091..7db037f631f7 100644
> --- a/drivers/gpu/drm/i915/display/intel_dp.c
> +++ b/drivers/gpu/drm/i915/display/intel_dp.c
> @@ -859,23 +859,52 @@ u32 intel_dp_dsc_nearest_valid_bpp(struct
> drm_i915_private *i915, u32 bpp, u32 p
> return bits_per_pixel;
> }
>
> +static int get_bigjoiner_interface_bits(struct intel_display *display)
I would s/get_// in the name.
> +{
> + return DISPLAY_VER(display) >= 14 ? 36 : 24;
> +}
> +
> +static u32 bigjoiner_bw_max_bpp(struct intel_display *display, u32
> mode_clock,
> + int num_joined_pipes)
> +{
> + struct drm_i915_private *i915 = to_i915(display->drm);
> + int bigjoiner_interface_bits = get_bigjoiner_interface_bits(display);
You don't really need the local variable for this.
> + int num_bigjoiners = num_joined_pipes / 2;
> + u32 max_bpp;
> + /* With bigjoiner multiple dsc engines are used in parallel so PPC is 2
> */
> + int ppc = 2;
> +
> + max_bpp = i915->display.cdclk.max_cdclk_freq * ppc *
> bigjoiner_interface_bits /
s/i915->display./display->/
> + intel_dp_mode_to_fec_clock(mode_clock);
> +
> + max_bpp *= num_bigjoiners;
This thing wasn't in the original code, so should be added separately
IMO.
> +
> + return max_bpp;
> +}
> +
> +static u32 small_joiner_ram_max_bpp(struct intel_display *display, u32
> mode_hdisplay)
> +{
> + struct drm_i915_private *i915 = to_i915(display->drm);
> + u32 max_bpp;
> +
> + /* Small Joiner Check: output bpp <= joiner RAM (bits) / Horiz. width */
> + max_bpp = small_joiner_ram_size_bits(i915) / mode_hdisplay;
> +
> + return max_bpp;
> +}
> +
> static
> u32 get_max_compressed_bpp_with_joiner(struct drm_i915_private *i915,
> u32 mode_clock, u32 mode_hdisplay,
> int num_joined_pipes)
> {
> + struct intel_display *display = to_intel_display(&i915->drm);
> u32 max_bpp_small_joiner_ram;
>
> - /* Small Joiner Check: output bpp <= joiner RAM (bits) / Horiz. width */
> - max_bpp_small_joiner_ram = small_joiner_ram_size_bits(i915) /
> mode_hdisplay;
> + max_bpp_small_joiner_ram = small_joiner_ram_max_bpp(display,
> mode_hdisplay);
>
> if (num_joined_pipes == 2) {
> - int bigjoiner_interface_bits = DISPLAY_VER(i915) >= 14 ? 36 :
> 24;
> - /* With bigjoiner multiple dsc engines are used in parallel so
> PPC is 2 */
> - int ppc = 2;
> - u32 max_bpp_bigjoiner =
> - i915->display.cdclk.max_cdclk_freq * ppc *
> bigjoiner_interface_bits /
> - intel_dp_mode_to_fec_clock(mode_clock);
> + u32 max_bpp_bigjoiner = bigjoiner_bw_max_bpp(display,
> mode_clock, num_joined_pipes);
>
> max_bpp_small_joiner_ram *= 2;
That multiplication should be inside small_joiner_ram_max_bpp().
>
> --
> 2.45.2
--
Ville Syrjälä
Intel
