[Intel-gfx] [PATCH 16/18] drm/i915: HSW cdclk change support
ville.syrjala at linux.intel.com
ville.syrjala at linux.intel.com
Mon Nov 17 15:43:50 CET 2014
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
Signed-off-by: Ville Syrjälä <ville.syrjala at linux.intel.com>
---
drivers/gpu/drm/i915/i915_reg.h | 3 +
drivers/gpu/drm/i915/intel_display.c | 138 ++++++++++++++++++++++++++++++++++-
2 files changed, 138 insertions(+), 3 deletions(-)
diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index 1b4d93a..4349543 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -6045,6 +6045,7 @@ enum punit_power_well {
#define GEN6_PCODE_WRITE_D_COMP 0x11
#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 DISPLAY_IPS_CONTROL 0x19
#define GEN6_PCODE_DATA 0x138128
#define GEN6_PCODE_FREQ_IA_RATIO_SHIFT 8
@@ -6454,10 +6455,12 @@ enum punit_power_well {
#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)
#define LCPLL_CD_CLOCK_DISABLE (1<<25)
+#define LCPLL_ROOT_CD_CLOCK_DISABLE (1<<24)
#define LCPLL_CD2X_CLOCK_DISABLE (1<<23)
#define LCPLL_POWER_DOWN_ALLOW (1<<22)
#define LCPLL_CD_SOURCE_FCLK (1<<21)
diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index 709dc34..b0bda85 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -4749,7 +4749,16 @@ static void intel_update_max_cdclk(struct drm_device *dev)
{
struct drm_i915_private *dev_priv = dev->dev_private;
- if (IS_VALLEYVIEW(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_VALLEYVIEW(dev)) {
dev_priv->max_cdclk_freq = 400000;
} else {
/* otherwise assume cdclk is fixed */
@@ -8318,6 +8327,123 @@ void hsw_disable_pc8(struct drm_i915_private *dev_priv)
intel_prepare_ddi(dev);
}
+/* compute the max rate for new configuration */
+static int ilk_max_pixel_rate(struct drm_i915_private *dev_priv)
+{
+ struct drm_device *dev = dev_priv->dev;
+ struct intel_crtc *crtc;
+ int max_pixel_rate = 0;
+
+ for_each_intel_crtc(dev, crtc) {
+ if (crtc->new_enabled)
+ max_pixel_rate = max_t(int, max_pixel_rate,
+ ilk_pipe_pixel_rate(crtc->new_config));
+ }
+
+ return max_pixel_rate;
+}
+
+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 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 void haswell_modeset_global_pipes(struct drm_device *dev,
+ unsigned *prepare_pipes)
+{
+ struct drm_i915_private *dev_priv = dev->dev_private;
+ struct intel_crtc *crtc;
+ int max_pixel_rate = ilk_max_pixel_rate(dev_priv);
+
+ if (haswell_calc_cdclk(dev_priv, max_pixel_rate) == dev_priv->cdclk_freq)
+ return;
+
+ /* disable/enable all currently active pipes while we change cdclk */
+ for_each_intel_crtc(dev, crtc)
+ if (crtc->base.enabled)
+ *prepare_pipes |= 1 << crtc->pipe;
+}
+
+static void haswell_modeset_global_resources(struct drm_device *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)
{
if (!intel_ddi_pll_select(crtc))
@@ -11272,8 +11398,11 @@ static int __intel_set_mode(struct drm_crtc *crtc,
* mode set on this crtc. For other crtcs we need to use the
* adjusted_mode bits in the crtc directly.
*/
- if (IS_VALLEYVIEW(dev)) {
- valleyview_modeset_global_pipes(dev, &prepare_pipes);
+ if (IS_VALLEYVIEW(dev) || IS_HASWELL(dev)) {
+ if (IS_VALLEYVIEW(dev))
+ valleyview_modeset_global_pipes(dev, &prepare_pipes);
+ else
+ haswell_modeset_global_pipes(dev, &prepare_pipes);
/* may have added more to prepare_pipes than we should */
prepare_pipes &= ~disable_pipes;
@@ -13086,6 +13215,9 @@ static void intel_init_display(struct drm_device *dev)
ivb_modeset_global_resources;
} else if (IS_HASWELL(dev) || IS_BROADWELL(dev)) {
dev_priv->display.fdi_link_train = hsw_fdi_link_train;
+ if (IS_HASWELL(dev))
+ 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;
--
2.0.4
More information about the Intel-gfx
mailing list