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drm/i915/mtl: Skip doubling channel numbers for LPDDR4/LPDDDR5

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MTL LPDDR5 reported 16b with 8 channels. Previous platforms
reported 32b with 4 channels and hence needed a multiplication
by a factor of 2. Skip increasing the channels for MTL.

v2: Use version check instead of platform check(MattR)

Bspec: 64631
Cc: Matt Roper <matthew.d.roper@intel.com>
Signed-off-by: Radhakrishna Sripada <radhakrishna.sripada@intel.com>
Reviewed-by: Matt Roper <matthew.d.roper@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20221117213015.584417-2-radhakrishna.sripada@intel.com
This commit is contained in:
Radhakrishna Sripada
2022-11-17 13:30:15 -08:00
parent ec35c41d91
commit 244c679b4b
1 changed files with 2 additions and 1 deletions
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3
drivers/gpu/drm/i915/display/intel_bw.c
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@@ -439,7 +439,8 @@ static int tgl_get_bw_info(struct drm_i915_private *dev_priv, const struct intel
return ret;
}
if (dram_info->type == INTEL_DRAM_LPDDR4 || dram_info->type == INTEL_DRAM_LPDDR5)
if (DISPLAY_VER(dev_priv) < 14 &&
(dram_info->type == INTEL_DRAM_LPDDR4 || dram_info->type == INTEL_DRAM_LPDDR5))
num_channels *= 2;
qi.deinterleave = qi.deinterleave ? : DIV_ROUND_UP(num_channels, is_y_tile ? 4 : 2);