[Intel-gfx] [PATCH v6 8/8] drm/i915: HSW cdclk support
Mika Kahola
mika.kahola at intel.com
Wed Jun 3 05:45:14 PDT 2015
From: Ville Syrjälä <ville.syrjala at linux.intel.com>
Implement support for changing the cdclk frequency during runtime on
HSW. VLV/CHV already have support for this, so we can follow their
example for the most part. Only the actual hardware programming differs,
the rest is pretty much the same.
The pipe pixel rate stuff is handled a bit differently for now due to
the difference in pch vs. gmch pfit handling. Eventually we should unify
that part to eliminate what is essentially duplicated code.
v2: Grab rps.hw_lock around sandybridge_pcode_write()
v3: Rebase due to power well vs. .global_resources() reordering
v4: Rebased to the latest
v5: Reformatting 'haswell_modeset_global_pipes' function to
support atomic state
v6: Shuffling the patch order so the Broadwell CD clock patch
can be applied before this Haswell CD clock patch
v7: Fix for patch style problems
Signed-off-by: Ville Syrjälä <ville.syrjala at linux.intel.com>
Signed-off-by: Mika Kahola <mika.kahola at intel.com>
Author: Ville Syrjälä <ville.syrjala at linux.intel.com>
---
drivers/gpu/drm/i915/i915_reg.h | 2 +
drivers/gpu/drm/i915/intel_display.c | 137 ++++++++++++++++++++++++++++++++++-
2 files changed, 136 insertions(+), 3 deletions(-)
diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index 0f72c0e..418d149 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -6705,6 +6705,7 @@ enum skl_disp_power_wells {
#define GEN6_PCODE_READ_RC6VIDS 0x5
#define GEN6_ENCODE_RC6_VID(mv) (((mv) - 245) / 5)
#define GEN6_DECODE_RC6_VID(vids) (((vids) * 5) + 245)
+#define HSW_PCODE_DE_WRITE_FREQ_REQ 0x17
#define BDW_PCODE_DISPLAY_FREQ_CHANGE_REQ 0x18
#define GEN9_PCODE_READ_MEM_LATENCY 0x6
#define GEN9_MEM_LATENCY_LEVEL_MASK 0xFF
@@ -7167,6 +7168,7 @@ enum skl_disp_power_wells {
#define LCPLL_PLL_LOCK (1<<30)
#define LCPLL_CLK_FREQ_MASK (3<<26)
#define LCPLL_CLK_FREQ_450 (0<<26)
+#define LCPLL_CLK_FREQ_ALT_HSW (1<<26) /* 337.5 (ULX) or 540 */
#define LCPLL_CLK_FREQ_54O_BDW (1<<26)
#define LCPLL_CLK_FREQ_337_5_BDW (2<<26)
#define LCPLL_CLK_FREQ_675_BDW (3<<26)
diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index b1e2069..4b9907d 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -5751,7 +5751,16 @@ static void intel_update_max_cdclk(struct drm_device *dev)
{
struct drm_i915_private *dev_priv = dev->dev_private;
- if (IS_BROADWELL(dev)) {
+ if (IS_HASWELL(dev)) {
+ if (I915_READ(FUSE_STRAP) & HSW_CDCLK_LIMIT)
+ dev_priv->max_cdclk_freq = 450000;
+ else if (IS_HSW_ULX(dev))
+ dev_priv->max_cdclk_freq = 337500;
+ else if (IS_HSW_ULT(dev))
+ dev_priv->max_cdclk_freq = 450000;
+ else
+ dev_priv->max_cdclk_freq = 540000;
+ } else if (IS_BROADWELL(dev)) {
/*
* FIXME with extra cooling we can allow
* 540 MHz for ULX and 675 Mhz for ULT.
@@ -9755,6 +9764,80 @@ static int broadwell_calc_cdclk(struct drm_i915_private *dev_priv,
return cdclk;
}
+static void haswell_set_cdclk(struct drm_device *dev, int cdclk)
+{
+ struct drm_i915_private *dev_priv = dev->dev_private;
+ uint32_t val;
+
+ if (WARN((I915_READ(LCPLL_CTL) &
+ (LCPLL_PLL_DISABLE | LCPLL_PLL_LOCK |
+ LCPLL_CD_CLOCK_DISABLE | LCPLL_ROOT_CD_CLOCK_DISABLE |
+ LCPLL_CD2X_CLOCK_DISABLE | LCPLL_POWER_DOWN_ALLOW |
+ LCPLL_CD_SOURCE_FCLK)) != LCPLL_PLL_LOCK,
+ "trying to change cdclk frequency with cdclk not enabled\n"))
+ return;
+
+ val = I915_READ(LCPLL_CTL);
+ val &= ~LCPLL_CLK_FREQ_MASK;
+
+ switch (cdclk) {
+ case 450000:
+ val |= LCPLL_CLK_FREQ_450;
+ break;
+ case 337500:
+ case 540000:
+ val |= LCPLL_CLK_FREQ_ALT_HSW;
+ break;
+ default:
+ WARN(1, "invalid cdclk frequency\n");
+ return;
+ }
+
+ I915_WRITE(LCPLL_CTL, val);
+
+ if (IS_HSW_ULX(dev)) {
+ mutex_lock(&dev_priv->rps.hw_lock);
+ sandybridge_pcode_write(dev_priv, HSW_PCODE_DE_WRITE_FREQ_REQ,
+ cdclk == 337500);
+ mutex_unlock(&dev_priv->rps.hw_lock);
+ }
+
+ intel_update_cdclk(dev);
+
+ WARN(cdclk != dev_priv->cdclk_freq,
+ "cdclk requested %d kHz but got %d kHz\n",
+ cdclk, dev_priv->cdclk_freq);
+}
+
+static int haswell_calc_cdclk(struct drm_i915_private *dev_priv,
+ int max_pixel_rate)
+{
+ int cdclk;
+
+ /*
+ * FIXME should also account for plane ratio
+ * once 64bpp pixel formats are supported.
+ */
+ if (max_pixel_rate > 450000)
+ cdclk = 540000;
+ else if (max_pixel_rate > 337500 || !IS_HSW_ULX(dev_priv))
+ cdclk = 450000;
+ else
+ cdclk = 337500;
+
+ /*
+ * FIXME move the cdclk caclulation to
+ * compute_config() so we can fail gracegully.
+ */
+ if (cdclk > dev_priv->max_cdclk_freq) {
+ DRM_ERROR("requested cdclk (%d kHz) exceeds max (%d kHz)\n",
+ cdclk, dev_priv->max_cdclk_freq);
+ cdclk = dev_priv->max_cdclk_freq;
+ }
+
+ return cdclk;
+}
+
static int broadwell_modeset_global_pipes(struct drm_atomic_state *state)
{
struct drm_i915_private *dev_priv = to_i915(state->dev);
@@ -9797,6 +9880,49 @@ static void broadwell_modeset_global_resources(struct drm_atomic_state *state)
broadwell_set_cdclk(dev, req_cdclk);
}
+static int haswell_modeset_global_pipes(struct drm_atomic_state *state)
+{
+ struct drm_i915_private *dev_priv = to_i915(state->dev);
+ struct drm_crtc *crtc;
+ struct drm_crtc_state *crtc_state;
+ int max_pixclk = ilk_max_pixel_rate(dev_priv);
+ int cdclk, i;
+
+ cdclk = haswell_calc_cdclk(dev_priv, max_pixclk);
+
+ if (cdclk == dev_priv->cdclk_freq)
+ return 0;
+
+ /* add all active pipes to the state */
+ for_each_crtc(state->dev, crtc) {
+ if (!crtc->state->enable)
+ continue;
+
+ crtc_state = drm_atomic_get_crtc_state(state, crtc);
+ if (IS_ERR(crtc_state))
+ return PTR_ERR(crtc_state);
+ }
+
+ /* disable/enable all currently active pipes while we change cdclk */
+ for_each_crtc_in_state(state, crtc, crtc_state, i)
+ if (crtc_state->enable)
+ crtc_state->mode_changed = true;
+
+ return 0;
+}
+
+static void haswell_modeset_global_resources(struct drm_atomic_state *state)
+{
+ struct drm_device *dev = state->dev;
+ struct drm_i915_private *dev_priv = dev->dev_private;
+ int max_pixel_rate = ilk_max_pixel_rate(dev_priv);
+ int req_cdclk = haswell_calc_cdclk(dev_priv, max_pixel_rate);
+
+ if (req_cdclk != dev_priv->cdclk_freq) {
+ haswell_set_cdclk(dev, req_cdclk);
+ }
+}
+
static int haswell_crtc_compute_clock(struct intel_crtc *crtc,
struct intel_crtc_state *crtc_state)
{
@@ -12977,11 +13103,13 @@ static int __intel_set_mode_checks(struct drm_atomic_state *state)
* mode set on this crtc. For other crtcs we need to use the
* adjusted_mode bits in the crtc directly.
*/
- if (IS_VALLEYVIEW(dev) || IS_BROXTON(dev) || IS_BROADWELL(dev)) {
+ if (IS_VALLEYVIEW(dev) || IS_BROXTON(dev) || IS_BROADWELL(dev) || IS_HASWELL(dev)) {
if (IS_VALLEYVIEW(dev) || IS_BROXTON(dev))
ret = valleyview_modeset_global_pipes(state);
- else
+ else if (IS_BROADWELL(dev))
ret = broadwell_modeset_global_pipes(state);
+ else
+ ret = haswell_modeset_global_pipes(state);
if (ret)
return ret;
@@ -14873,6 +15001,9 @@ static void intel_init_display(struct drm_device *dev)
if (IS_BROADWELL(dev))
dev_priv->display.modeset_global_resources =
broadwell_modeset_global_resources;
+ else
+ dev_priv->display.modeset_global_resources =
+ haswell_modeset_global_resources;
} else if (IS_VALLEYVIEW(dev)) {
dev_priv->display.modeset_global_resources =
valleyview_modeset_global_resources;
--
1.9.1
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