[Intel-gfx] [PATCH v2 11/26] drm/i915: Introduce struct iclkip_params
Ville Syrjala
ville.syrjala at linux.intel.com
Wed May 4 21:21:09 UTC 2022
From: Ville Syrjälä <ville.syrjala at linux.intel.com>
Pull the various iCLKIP parameters into a struct. Later on
we'll reuse this during the state computation to determine
the exact dotclock the hardware will be generating for us.
v2: Don't lost the phaseinc calculation
Signed-off-by: Ville Syrjälä <ville.syrjala at linux.intel.com>
---
drivers/gpu/drm/i915/display/intel_crt.c | 1 +
.../gpu/drm/i915/display/intel_pch_refclk.c | 92 ++++++++++++-------
2 files changed, 58 insertions(+), 35 deletions(-)
diff --git a/drivers/gpu/drm/i915/display/intel_crt.c b/drivers/gpu/drm/i915/display/intel_crt.c
index 6a3893c8ff22..d746c85e7e8c 100644
--- a/drivers/gpu/drm/i915/display/intel_crt.c
+++ b/drivers/gpu/drm/i915/display/intel_crt.c
@@ -46,6 +46,7 @@
#include "intel_gmbus.h"
#include "intel_hotplug.h"
#include "intel_pch_display.h"
+#include "intel_pch_refclk.h"
/* Here's the desired hotplug mode */
#define ADPA_HOTPLUG_BITS (ADPA_CRT_HOTPLUG_PERIOD_128 | \
diff --git a/drivers/gpu/drm/i915/display/intel_pch_refclk.c b/drivers/gpu/drm/i915/display/intel_pch_refclk.c
index b688fd87e3da..752dab11667f 100644
--- a/drivers/gpu/drm/i915/display/intel_pch_refclk.c
+++ b/drivers/gpu/drm/i915/display/intel_pch_refclk.c
@@ -122,16 +122,29 @@ void lpt_disable_iclkip(struct drm_i915_private *dev_priv)
mutex_unlock(&dev_priv->sb_lock);
}
-/* Program iCLKIP clock to the desired frequency */
-void lpt_program_iclkip(const struct intel_crtc_state *crtc_state)
+struct iclkip_params {
+ u32 iclk_virtual_root_freq;
+ u32 iclk_pi_range;
+ u32 divsel, phaseinc, auxdiv, phasedir, desired_divisor;
+};
+
+static void iclkip_params_init(struct iclkip_params *p)
{
- struct intel_crtc *crtc = to_intel_crtc(crtc_state->uapi.crtc);
- struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);
- int clock = crtc_state->hw.adjusted_mode.crtc_clock;
- u32 divsel, phaseinc, auxdiv, phasedir = 0;
- u32 temp;
+ memset(p, 0, sizeof(*p));
+
+ p->iclk_virtual_root_freq = 172800 * 1000;
+ p->iclk_pi_range = 64;
+}
- lpt_disable_iclkip(dev_priv);
+static int lpt_iclkip_freq(struct iclkip_params *p)
+{
+ return DIV_ROUND_CLOSEST(p->iclk_virtual_root_freq,
+ p->desired_divisor << p->auxdiv);
+}
+
+static void lpt_compute_iclkip(struct iclkip_params *p, int clock)
+{
+ iclkip_params_init(p);
/* The iCLK virtual clock root frequency is in MHz,
* but the adjusted_mode->crtc_clock in KHz. To get the
@@ -139,50 +152,61 @@ void lpt_program_iclkip(const struct intel_crtc_state *crtc_state)
* convert the virtual clock precision to KHz here for higher
* precision.
*/
- for (auxdiv = 0; auxdiv < 2; auxdiv++) {
- u32 iclk_virtual_root_freq = 172800 * 1000;
- u32 iclk_pi_range = 64;
- u32 desired_divisor;
-
- desired_divisor = DIV_ROUND_CLOSEST(iclk_virtual_root_freq,
- clock << auxdiv);
- divsel = (desired_divisor / iclk_pi_range) - 2;
- phaseinc = desired_divisor % iclk_pi_range;
+ for (p->auxdiv = 0; p->auxdiv < 2; p->auxdiv++) {
+ p->desired_divisor = DIV_ROUND_CLOSEST(p->iclk_virtual_root_freq,
+ clock << p->auxdiv);
+ p->divsel = (p->desired_divisor / p->iclk_pi_range) - 2;
+ p->phaseinc = p->desired_divisor % p->iclk_pi_range;
/*
* Near 20MHz is a corner case which is
* out of range for the 7-bit divisor
*/
- if (divsel <= 0x7f)
+ if (p->divsel <= 0x7f)
break;
}
+}
+
+/* Program iCLKIP clock to the desired frequency */
+void lpt_program_iclkip(const struct intel_crtc_state *crtc_state)
+{
+ struct intel_crtc *crtc = to_intel_crtc(crtc_state->uapi.crtc);
+ struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);
+ int clock = crtc_state->hw.adjusted_mode.crtc_clock;
+ struct iclkip_params p;
+ u32 temp;
+
+ lpt_disable_iclkip(dev_priv);
+
+ lpt_compute_iclkip(&p, clock);
+ drm_WARN_ON(&dev_priv->drm, lpt_iclkip_freq(&p) != clock);
/* This should not happen with any sane values */
- drm_WARN_ON(&dev_priv->drm, SBI_SSCDIVINTPHASE_DIVSEL(divsel) &
+ drm_WARN_ON(&dev_priv->drm, SBI_SSCDIVINTPHASE_DIVSEL(p.divsel) &
~SBI_SSCDIVINTPHASE_DIVSEL_MASK);
- drm_WARN_ON(&dev_priv->drm, SBI_SSCDIVINTPHASE_DIR(phasedir) &
+ drm_WARN_ON(&dev_priv->drm, SBI_SSCDIVINTPHASE_DIR(p.phasedir) &
~SBI_SSCDIVINTPHASE_INCVAL_MASK);
drm_dbg_kms(&dev_priv->drm,
"iCLKIP clock: found settings for %dKHz refresh rate: auxdiv=%x, divsel=%x, phasedir=%x, phaseinc=%x\n",
- clock, auxdiv, divsel, phasedir, phaseinc);
+ clock, p.auxdiv, p.divsel, p.phasedir, p.phaseinc);
mutex_lock(&dev_priv->sb_lock);
/* Program SSCDIVINTPHASE6 */
temp = intel_sbi_read(dev_priv, SBI_SSCDIVINTPHASE6, SBI_ICLK);
temp &= ~SBI_SSCDIVINTPHASE_DIVSEL_MASK;
- temp |= SBI_SSCDIVINTPHASE_DIVSEL(divsel);
+ temp |= SBI_SSCDIVINTPHASE_DIVSEL(p.divsel);
temp &= ~SBI_SSCDIVINTPHASE_INCVAL_MASK;
- temp |= SBI_SSCDIVINTPHASE_INCVAL(phaseinc);
- temp |= SBI_SSCDIVINTPHASE_DIR(phasedir);
+ temp |= SBI_SSCDIVINTPHASE_INCVAL(p.phaseinc);
+ temp |= SBI_SSCDIVINTPHASE_DIR(p.phasedir);
temp |= SBI_SSCDIVINTPHASE_PROPAGATE;
intel_sbi_write(dev_priv, SBI_SSCDIVINTPHASE6, temp, SBI_ICLK);
/* Program SSCAUXDIV */
temp = intel_sbi_read(dev_priv, SBI_SSCAUXDIV6, SBI_ICLK);
temp &= ~SBI_SSCAUXDIV_FINALDIV2SEL(1);
- temp |= SBI_SSCAUXDIV_FINALDIV2SEL(auxdiv);
+ temp |= SBI_SSCAUXDIV_FINALDIV2SEL(p.auxdiv);
intel_sbi_write(dev_priv, SBI_SSCAUXDIV6, temp, SBI_ICLK);
/* Enable modulator and associated divider */
@@ -200,15 +224,14 @@ void lpt_program_iclkip(const struct intel_crtc_state *crtc_state)
int lpt_get_iclkip(struct drm_i915_private *dev_priv)
{
- u32 divsel, phaseinc, auxdiv;
- u32 iclk_virtual_root_freq = 172800 * 1000;
- u32 iclk_pi_range = 64;
- u32 desired_divisor;
+ struct iclkip_params p;
u32 temp;
if ((intel_de_read(dev_priv, PIXCLK_GATE) & PIXCLK_GATE_UNGATE) == 0)
return 0;
+ iclkip_params_init(&p);
+
mutex_lock(&dev_priv->sb_lock);
temp = intel_sbi_read(dev_priv, SBI_SSCCTL6, SBI_ICLK);
@@ -218,21 +241,20 @@ int lpt_get_iclkip(struct drm_i915_private *dev_priv)
}
temp = intel_sbi_read(dev_priv, SBI_SSCDIVINTPHASE6, SBI_ICLK);
- divsel = (temp & SBI_SSCDIVINTPHASE_DIVSEL_MASK) >>
+ p.divsel = (temp & SBI_SSCDIVINTPHASE_DIVSEL_MASK) >>
SBI_SSCDIVINTPHASE_DIVSEL_SHIFT;
- phaseinc = (temp & SBI_SSCDIVINTPHASE_INCVAL_MASK) >>
+ p.phaseinc = (temp & SBI_SSCDIVINTPHASE_INCVAL_MASK) >>
SBI_SSCDIVINTPHASE_INCVAL_SHIFT;
temp = intel_sbi_read(dev_priv, SBI_SSCAUXDIV6, SBI_ICLK);
- auxdiv = (temp & SBI_SSCAUXDIV_FINALDIV2SEL_MASK) >>
+ p.auxdiv = (temp & SBI_SSCAUXDIV_FINALDIV2SEL_MASK) >>
SBI_SSCAUXDIV_FINALDIV2SEL_SHIFT;
mutex_unlock(&dev_priv->sb_lock);
- desired_divisor = (divsel + 2) * iclk_pi_range + phaseinc;
+ p.desired_divisor = (p.divsel + 2) * p.iclk_pi_range + p.phaseinc;
- return DIV_ROUND_CLOSEST(iclk_virtual_root_freq,
- desired_divisor << auxdiv);
+ return lpt_iclkip_freq(&p);
}
/* Implements 3 different sequences from BSpec chapter "Display iCLK
--
2.35.1
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