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drm/i915: Add TigerLake bandwidth checking

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Added bandwidth calculation algorithm and checks,
similar way as it was done for ICL, some constants
were corrected according to BSpec 53998.

v2: Start using same icl_get_bw_info function to avoid
    code duplication. Moved mpagesize to memory info
    related structure as it is now dependent on memory type.
    Fixed qi.t_bl field assignment.

v3: Removed mpagesize as unused. Duplicate code and redundant blankline
    fixed.

v4: Changed ordering of IS_GEN checks as agreed. Minor commit
    message fixes.

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=111600
Reviewed-by: James Ausmus <james.ausmus@intel.com>
Signed-off-by: Stanislav Lisovskiy <stanislav.lisovskiy@intel.com>
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20190920083754.5920-1-stanislav.lisovskiy@intel.com
This commit is contained in:
Stanislav Lisovskiy 2019-09-20 11:37:54 +03:00 committed by Ville Syrjälä
parent 5028851cdf
commit 1b74d46782
1 changed files with 18 additions and 8 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

26
drivers/gpu/drm/i915/display/intel_bw.c
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@ -56,7 +56,10 @@ static int icl_pcode_read_mem_global_info(struct drm_i915_private *dev_priv,
qi->num_channels = (val & 0xf0) >> 4;
qi->num_points = (val & 0xf00) >> 8;
qi->t_bl = qi->dram_type == INTEL_DRAM_DDR4 ? 4 : 8;
if (IS_GEN(dev_priv, 12))
qi->t_bl = qi->dram_type == INTEL_DRAM_DDR4 ? 4 : 16;
else if (IS_GEN(dev_priv, 11))
qi->t_bl = qi->dram_type == INTEL_DRAM_DDR4 ? 4 : 8;
return 0;
}
@ -132,20 +135,25 @@ static int icl_sagv_max_dclk(const struct intel_qgv_info *qi)
}
struct intel_sa_info {
u8 deburst, mpagesize, deprogbwlimit, displayrtids;
u16 displayrtids;
u8 deburst, deprogbwlimit;
};
static const struct intel_sa_info icl_sa_info = {
.deburst = 8,
.mpagesize = 16,
.deprogbwlimit = 25, /* GB/s */
.displayrtids = 128,
};
static int icl_get_bw_info(struct drm_i915_private *dev_priv)
static const struct intel_sa_info tgl_sa_info = {
.deburst = 16,
.deprogbwlimit = 34, /* GB/s */
.displayrtids = 256,
};
static int icl_get_bw_info(struct drm_i915_private *dev_priv, const struct intel_sa_info *sa)
{
struct intel_qgv_info qi = {};
const struct intel_sa_info *sa = &icl_sa_info;
bool is_y_tile = true; /* assume y tile may be used */
int num_channels;
int deinterleave;
@ -233,14 +241,16 @@ static unsigned int icl_max_bw(struct drm_i915_private *dev_priv,
void intel_bw_init_hw(struct drm_i915_private *dev_priv)
{
if (IS_GEN(dev_priv, 11))
icl_get_bw_info(dev_priv);
if (IS_GEN(dev_priv, 12))
icl_get_bw_info(dev_priv, &tgl_sa_info);
else if (IS_GEN(dev_priv, 11))
icl_get_bw_info(dev_priv, &icl_sa_info);
}
static unsigned int intel_max_data_rate(struct drm_i915_private *dev_priv,
int num_planes)
{
if (IS_GEN(dev_priv, 11))
if (INTEL_GEN(dev_priv) >= 11)
/*
* FIXME with SAGV disabled maybe we can assume
* point 1 will always be used? Seems to match