[PATCH 04/19] drm/i915: Add cdclk extraction for g33, g965gm and g4x

Mika Kahola
2015-03-31T11:12:17Z

Implement cdclk extraction for g33, 965gm and g4x platforms. The details
came from configdb. Sadly there isn't anything there for other gen3/gen4
chipsets.

So far I've tested this on one ELK where it gave me a HPLL VCO of 5333
MHz and cdclk of 444 MHz which seems perfectly sane for this machine.

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Mika Kahola <mika.kahola@intel.com>
---
drivers/gpu/drm/i915/i915_reg.h | 3 +
drivers/gpu/drm/i915/intel_display.c | 186 ++++++++++++++++++++++++++++++++++-
2 files changed, 185 insertions(+), 4 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index ee6b306..f26ebd2 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -2223,6 +2223,9 @@ enum skl_disp_power_wells {
#define CLKCFG_MEM_800 (3 << 4)
#define CLKCFG_MEM_MASK (7 << 4)

+#define HPLLVCO (MCHBAR_MIRROR_BASE + 0xc38)
+#define HPLLVCO_MOBILE (MCHBAR_MIRROR_BASE + 0xc0f)
+
#define TSC1 0x11001
#define TSE (1<<0)
#define TR1 0x11006
diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index 774dc6e..bebbfd2 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -5991,6 +5991,175 @@ static int i830_get_display_clock_speed(struct drm_device *dev)
return 133333;
}

+static unsigned int intel_hpll_vco(struct drm_device *dev)
+{
+ struct drm_i915_private *dev_priv = dev->dev_private;
+ static const unsigned int blb_vco[8] = {
+ [0] = 3200000,
+ [1] = 4000000,
+ [2] = 5333333,
+ [3] = 4800000,
+ [4] = 6400000,
+ };
+ static const unsigned int pnv_vco[8] = {
+ [0] = 3200000,
+ [1] = 4000000,
+ [2] = 5333333,
+ [3] = 4800000,
+ [4] = 2666667,
+ };
+ static const unsigned int cl_vco[8] = {
+ [0] = 3200000,
+ [1] = 4000000,
+ [2] = 5333333,
+ [3] = 6400000,
+ [4] = 3333333,
+ [5] = 3566667,
+ [6] = 4266667,
+ };
+ static const unsigned int elk_vco[8] = {
+ [0] = 3200000,
+ [1] = 4000000,
+ [2] = 5333333,
+ [3] = 4800000,
+ };
+ static const unsigned int ctg_vco[8] = {
+ [0] = 3200000,
+ [1] = 4000000,
+ [2] = 5333333,
+ [3] = 6400000,
+ [4] = 2666667,
+ [5] = 4266667,
+ };
+ const unsigned int *vco_table;
+ unsigned int vco;
+ uint8_t tmp = 0;
+
+ /* FIXME other chipsets? */
+ if (IS_GM45(dev))
+ vco_table = ctg_vco;
+ else if (IS_G4X(dev))
+ vco_table = elk_vco;
+ else if (IS_CRESTLINE(dev))
+ vco_table = cl_vco;
+ else if (IS_PINEVIEW(dev))
+ vco_table = pnv_vco;
+ else if (IS_G33(dev))
+ vco_table = blb_vco;
+ else
+ return 0;
+
+ tmp = I915_READ(IS_MOBILE(dev) ? HPLLVCO_MOBILE : HPLLVCO);
+
+ vco = vco_table[tmp & 0x7];
+ if (vco == 0)
+ DRM_ERROR("Bad HPLL VCO (HPLLVCO=0x%02x)\n", tmp);
+ else
+ DRM_DEBUG_KMS("HPLL VCO %u kHz\n", vco);
+
+ return vco;
+}
+
+static int gm45_get_display_clock_speed(struct drm_device *dev)
+{
+ unsigned int cdclk_sel, vco = intel_hpll_vco(dev);
+ uint16_t tmp = 0;
+
+ pci_read_config_word(dev->pdev, GCFGC, &tmp);
+
+ cdclk_sel = (tmp >> 12) & 0x1;
+
+ switch (vco) {
+ case 2666667:
+ case 4000000:
+ case 5333333:
+ return cdclk_sel ? 333333 : 222222;
+ case 3200000:
+ return cdclk_sel ? 320000 : 228571;
+ default:
+ DRM_ERROR("Unable to determine CDCLK. HPLL VCO=%u, CFGC=0x%04x\n", vco, tmp);
+ return 222222;
+ }
+}
+
+static int i965gm_get_display_clock_speed(struct drm_device *dev)
+{
+ static const uint8_t div_3200[] = { 16, 10, 8 };
+ static const uint8_t div_4000[] = { 20, 12, 10 };
+ static const uint8_t div_5333[] = { 24, 16, 14 };
+ const uint8_t *div_table;
+ unsigned int cdclk_sel, vco = intel_hpll_vco(dev);
+ uint16_t tmp = 0;
+
+ pci_read_config_word(dev->pdev, GCFGC, &tmp);
+
+ cdclk_sel = ((tmp >> 8) & 0x1f) - 1;
+
+ if (cdclk_sel >= ARRAY_SIZE(div_3200))
+ goto fail;
+
+ switch (vco) {
+ case 3200000:
+ div_table = div_3200;
+ break;
+ case 4000000:
+ div_table = div_4000;
+ break;
+ case 5333333:
+ div_table = div_5333;
+ break;
+ default:
+ goto fail;
+ }
+
+ return DIV_ROUND_CLOSEST(vco, div_table[cdclk_sel]);
+
+ fail:
+ DRM_ERROR("Unable to determine CDCLK. HPLL VCO=%u kHz, CFGC=0x%04x\n", vco, tmp);
+ return 200000;
+}
+
+static int g33_get_display_clock_speed(struct drm_device *dev)
+{
+ static const uint8_t div_3200[] = { 12, 10, 8, 7, 5, 16 };
+ static const uint8_t div_4000[] = { 14, 12, 10, 8, 6, 20 };
+ static const uint8_t div_4800[] = { 20, 14, 12, 10, 8, 24 };
+ static const uint8_t div_5333[] = { 20, 16, 12, 12, 8, 28 };
+ const uint8_t *div_table;
+ unsigned int cdclk_sel, vco = intel_hpll_vco(dev);
+ uint16_t tmp = 0;
+
+ pci_read_config_word(dev->pdev, GCFGC, &tmp);
+
+ cdclk_sel = (tmp >> 4) & 0x7;
+
+ if (cdclk_sel >= ARRAY_SIZE(div_3200))
+ goto fail;
+
+ switch (vco) {
+ case 3200000:
+ div_table = div_3200;
+ break;
+ case 4000000:
+ div_table = div_4000;
+ break;
+ case 4800000:
+ div_table = div_4800;
+ break;
+ case 5333333:
+ div_table = div_5333;
+ break;
+ default:
+ goto fail;
+ }
+
+ return DIV_ROUND_CLOSEST(vco, div_table[cdclk_sel]);
+
+ fail:
+ DRM_ERROR("Unable to determine CDCLK. HPLL VCO=%u kHz, CFGC=0x%08x\n", vco, tmp);
+ return 190476;
+}
+
static void
intel_reduce_m_n_ratio(uint32_t *num, uint32_t *den)
{
@@ -13516,7 +13685,19 @@ static void intel_init_display(struct drm_device *dev)
if (IS_VALLEYVIEW(dev))
dev_priv->display.get_display_clock_speed =
valleyview_get_display_clock_speed;
- else if (IS_I945G(dev) || (IS_G33(dev) && !IS_PINEVIEW_M(dev)))
+ else if (IS_GM45(dev))
+ dev_priv->display.get_display_clock_speed =
+ gm45_get_display_clock_speed;
+ else if (IS_CRESTLINE(dev))
+ dev_priv->display.get_display_clock_speed =
+ i965gm_get_display_clock_speed;
+ else if (IS_PINEVIEW(dev))
+ dev_priv->display.get_display_clock_speed =
+ pnv_get_display_clock_speed;
+ else if (IS_G33(dev) || IS_G4X(dev))
+ dev_priv->display.get_display_clock_speed =
+ g33_get_display_clock_speed;
+ else if (IS_I945G(dev))
dev_priv->display.get_display_clock_speed =
i945_get_display_clock_speed;
else if (IS_I915G(dev))
@@ -13525,9 +13706,6 @@ static void intel_init_display(struct drm_device *dev)
else if (IS_I945GM(dev) || IS_845G(dev))
dev_priv->display.get_display_clock_speed =
i9xx_misc_get_display_clock_speed;
- else if (IS_PINEVIEW(dev))
- dev_priv->display.get_display_clock_speed =
- pnv_get_display_clock_speed;
else if (IS_I915GM(dev))
dev_priv->display.get_display_clock_speed =
i915gm_get_display_clock_speed;
--
1.9.1