[Intel-gfx] [PATCH 34/53] drm/i915/dg2: Add cdclk table and reference clock

Matt Roper
2021-07-01T20:26:33Z

Note that DG2 only has a single possible refclk frequency (38.4 MHz).

Bspec: 54034
Cc: Lucas De Marchi <lucas.demarchi@intel.com>
Signed-off-by: Anusha Srivatsa <anusha.srivatsa@intel.com>
Signed-off-by: Matt Roper <matthew.d.roper@intel.com>
---
drivers/gpu/drm/i915/display/intel_cdclk.c | 24 ++++++++++++++++++++--
1 file changed, 22 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/i915/display/intel_cdclk.c b/drivers/gpu/drm/i915/display/intel_cdclk.c
index 613ffcc68eba..08f34d87684f 100644
--- a/drivers/gpu/drm/i915/display/intel_cdclk.c
+++ b/drivers/gpu/drm/i915/display/intel_cdclk.c
@@ -1290,6 +1290,18 @@ static const struct intel_cdclk_vals adlp_cdclk_table[] = {
{}
};

+static const struct intel_cdclk_vals dg2_cdclk_table[] = {
+ { .refclk = 38400, .cdclk = 172800, .divider = 2, .ratio = 9 },
+ { .refclk = 38400, .cdclk = 179200, .divider = 3, .ratio = 14 },
+ { .refclk = 38400, .cdclk = 192000, .divider = 2, .ratio = 10 },
+ { .refclk = 38400, .cdclk = 192000, .divider = 3, .ratio = 15 },
+ { .refclk = 38400, .cdclk = 307200, .divider = 2, .ratio = 16 },
+ { .refclk = 38400, .cdclk = 326400, .divider = 4, .ratio = 34 },
+ { .refclk = 38400, .cdclk = 556800, .divider = 2, .ratio = 29 },
+ { .refclk = 38400, .cdclk = 652800, .divider = 2, .ratio = 34 },
+ {}
+};
+
static int bxt_calc_cdclk(struct drm_i915_private *dev_priv, int min_cdclk)
{
const struct intel_cdclk_vals *table = dev_priv->cdclk.table;
@@ -1408,7 +1420,9 @@ static void bxt_de_pll_readout(struct drm_i915_private *dev_priv,
{
u32 val, ratio;

- if (DISPLAY_VER(dev_priv) >= 11)
+ if (IS_DG2(dev_priv))
+ cdclk_config->ref = 38400;
+ else if (DISPLAY_VER(dev_priv) >= 11)
icl_readout_refclk(dev_priv, cdclk_config);
else if (IS_CANNONLAKE(dev_priv))
cnl_readout_refclk(dev_priv, cdclk_config);
@@ -2878,7 +2892,13 @@ u32 intel_read_rawclk(struct drm_i915_private *dev_priv)
*/
void intel_init_cdclk_hooks(struct drm_i915_private *dev_priv)
{
- if (IS_ALDERLAKE_P(dev_priv)) {
+ if (IS_DG2(dev_priv)) {
+ dev_priv->display.set_cdclk = bxt_set_cdclk;
+ dev_priv->display.bw_calc_min_cdclk = skl_bw_calc_min_cdclk;
+ dev_priv->display.modeset_calc_cdclk = bxt_modeset_calc_cdclk;
+ dev_priv->display.calc_voltage_level = tgl_calc_voltage_level;
+ dev_priv->cdclk.table = dg2_cdclk_table;
+ } else if (IS_ALDERLAKE_P(dev_priv)) {
dev_priv->display.set_cdclk = bxt_set_cdclk;
dev_priv->display.bw_calc_min_cdclk = skl_bw_calc_min_cdclk;
dev_priv->display.modeset_calc_cdclk = bxt_modeset_calc_cdclk;