Some MG PLL registers have fields that need to be preserved at their HW
default or BIOS programmed values. So make sure we preserve them.
v2:
- Add comment to icl_mg_pll_write() explaining the need for register
masks. (Vandita)
- Fix patchwork checkpatch warning.
v3:
- Rebase on drm-tip.
Cc: Vandita Kulkarni <vandita.kulkarni@xxxxxxxxx>
Cc: Paulo Zanoni <paulo.r.zanoni@xxxxxxxxx>
Cc: James Ausmus <james.ausmus@xxxxxxxxx>
Signed-off-by: Imre Deak <imre.deak@xxxxxxxxx>
Reviewed-by: James Ausmus <james.ausmus@xxxxxxxxx> (v1)
---
drivers/gpu/drm/i915/i915_reg.h | 13 ++++++++++++
drivers/gpu/drm/i915/intel_dpll_mgr.c | 39 +++++++++++++++++++++++++++++++----
2 files changed, 48 insertions(+), 4 deletions(-)
diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index 4bfd7a9bd75f..65b222287ee4 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -9047,6 +9047,7 @@ enum skl_power_gate {
#define _MG_REFCLKIN_CTL_PORT3 0x16A92C
#define _MG_REFCLKIN_CTL_PORT4 0x16B92C
#define MG_REFCLKIN_CTL_OD_2_MUX(x) ((x) << 8)
+#define MG_REFCLKIN_CTL_OD_2_MUX_MASK (0x7 << 8)
#define MG_REFCLKIN_CTL(port) _MMIO_PORT((port) - PORT_C, \
_MG_REFCLKIN_CTL_PORT1, \
_MG_REFCLKIN_CTL_PORT2)
@@ -9056,7 +9057,9 @@ enum skl_power_gate {
#define _MG_CLKTOP2_CORECLKCTL1_PORT3 0x16A8D8
#define _MG_CLKTOP2_CORECLKCTL1_PORT4 0x16B8D8
#define MG_CLKTOP2_CORECLKCTL1_B_DIVRATIO(x) ((x) << 16)
+#define MG_CLKTOP2_CORECLKCTL1_B_DIVRATIO_MASK (0xff << 16)
#define MG_CLKTOP2_CORECLKCTL1_A_DIVRATIO(x) ((x) << 8)
+#define MG_CLKTOP2_CORECLKCTL1_A_DIVRATIO_MASK (0xff << 8)
#define MG_CLKTOP2_CORECLKCTL1(port) _MMIO_PORT((port) - PORT_C, \
_MG_CLKTOP2_CORECLKCTL1_PORT1, \
_MG_CLKTOP2_CORECLKCTL1_PORT2)
@@ -9066,9 +9069,13 @@ enum skl_power_gate {
#define _MG_CLKTOP2_HSCLKCTL_PORT3 0x16A8D4
#define _MG_CLKTOP2_HSCLKCTL_PORT4 0x16B8D4
#define MG_CLKTOP2_HSCLKCTL_CORE_INPUTSEL(x) ((x) << 16)
+#define MG_CLKTOP2_HSCLKCTL_CORE_INPUTSEL_MASK (0x1 << 16)
#define MG_CLKTOP2_HSCLKCTL_TLINEDRV_CLKSEL(x) ((x) << 14)
+#define MG_CLKTOP2_HSCLKCTL_TLINEDRV_CLKSEL_MASK (0x3 << 14)
#define MG_CLKTOP2_HSCLKCTL_HSDIV_RATIO(x) ((x) << 12)
+#define MG_CLKTOP2_HSCLKCTL_HSDIV_RATIO_MASK (0x3 << 12)
#define MG_CLKTOP2_HSCLKCTL_DSDIV_RATIO(x) ((x) << 8)
+#define MG_CLKTOP2_HSCLKCTL_DSDIV_RATIO_MASK (0xf << 8)
#define MG_CLKTOP2_HSCLKCTL(port) _MMIO_PORT((port) - PORT_C, \
_MG_CLKTOP2_HSCLKCTL_PORT1, \
_MG_CLKTOP2_HSCLKCTL_PORT2)
@@ -9142,12 +9149,18 @@ enum skl_power_gate {
#define _MG_PLL_BIAS_PORT3 0x16AA14
#define _MG_PLL_BIAS_PORT4 0x16BA14
#define MG_PLL_BIAS_BIAS_GB_SEL(x) ((x) << 30)
+#define MG_PLL_BIAS_BIAS_GB_SEL_MASK (0x3 << 30)
#define MG_PLL_BIAS_INIT_DCOAMP(x) ((x) << 24)
+#define MG_PLL_BIAS_INIT_DCOAMP_MASK (0x3f << 24)
#define MG_PLL_BIAS_BIAS_BONUS(x) ((x) << 16)
+#define MG_PLL_BIAS_BIAS_BONUS_MASK (0xff << 16)
#define MG_PLL_BIAS_BIASCAL_EN (1 << 15)
#define MG_PLL_BIAS_CTRIM(x) ((x) << 8)
+#define MG_PLL_BIAS_CTRIM_MASK (0x1f << 8)
#define MG_PLL_BIAS_VREF_RDAC(x) ((x) << 5)
+#define MG_PLL_BIAS_VREF_RDAC_MASK (0x7 << 5)
#define MG_PLL_BIAS_IREFTRIM(x) ((x) << 0)
+#define MG_PLL_BIAS_IREFTRIM_MASK (0x1f << 0)
#define MG_PLL_BIAS(port) _MMIO_PORT((port) - PORT_C, _MG_PLL_BIAS_PORT1, \
_MG_PLL_BIAS_PORT2)
diff --git a/drivers/gpu/drm/i915/intel_dpll_mgr.c b/drivers/gpu/drm/i915/intel_dpll_mgr.c
index d4c7bacbe83e..57342364fd30 100644
--- a/drivers/gpu/drm/i915/intel_dpll_mgr.c
+++ b/drivers/gpu/drm/i915/intel_dpll_mgr.c
@@ -2945,10 +2945,21 @@ static bool icl_pll_get_hw_state(struct drm_i915_private *dev_priv,
case DPLL_ID_ICL_MGPLL4:
port = icl_mg_pll_id_to_port(id);
hw_state->mg_refclkin_ctl = I915_READ(MG_REFCLKIN_CTL(port));
+ hw_state->mg_refclkin_ctl &= MG_REFCLKIN_CTL_OD_2_MUX_MASK;
+
hw_state->mg_clktop2_coreclkctl1 =
I915_READ(MG_CLKTOP2_CORECLKCTL1(port));
+ hw_state->mg_clktop2_coreclkctl1 &=
+ MG_CLKTOP2_CORECLKCTL1_A_DIVRATIO_MASK;
+
hw_state->mg_clktop2_hsclkctl =
I915_READ(MG_CLKTOP2_HSCLKCTL(port));
+ hw_state->mg_clktop2_hsclkctl &=
+ MG_CLKTOP2_HSCLKCTL_TLINEDRV_CLKSEL_MASK |
+ MG_CLKTOP2_HSCLKCTL_CORE_INPUTSEL_MASK |
+ MG_CLKTOP2_HSCLKCTL_HSDIV_RATIO_MASK |
+ MG_CLKTOP2_HSCLKCTL_DSDIV_RATIO_MASK;
+
hw_state->mg_pll_div0 = I915_READ(MG_PLL_DIV0(port));
hw_state->mg_pll_div1 = I915_READ(MG_PLL_DIV1(port));
hw_state->mg_pll_lf = I915_READ(MG_PLL_LF(port));
@@ -2998,10 +3009,30 @@ static void icl_mg_pll_write(struct drm_i915_private *dev_priv,
enum port port = icl_mg_pll_id_to_port(pll->info->id);
u32 val;
- I915_WRITE(MG_REFCLKIN_CTL(port), hw_state->mg_refclkin_ctl);
- I915_WRITE(MG_CLKTOP2_CORECLKCTL1(port),
- hw_state->mg_clktop2_coreclkctl1);
- I915_WRITE(MG_CLKTOP2_HSCLKCTL(port), hw_state->mg_clktop2_hsclkctl);
+ /*
+ * Some of the following registers have reserved fields, so program
+ * these with RMW based on a mask. The mask can be fixed or generated
+ * during the calc/readout phase if the mask depends on some other HW
+ * state like refclk, see icl_calc_mg_pll_state().
+ */
+ val = I915_READ(MG_REFCLKIN_CTL(port));
+ val &= ~MG_REFCLKIN_CTL_OD_2_MUX_MASK;
+ val |= hw_state->mg_refclkin_ctl;
+ I915_WRITE(MG_REFCLKIN_CTL(port), val);
+
+ val = I915_READ(MG_CLKTOP2_CORECLKCTL1(port));
+ val &= ~MG_CLKTOP2_CORECLKCTL1_A_DIVRATIO_MASK;
+ val |= hw_state->mg_clktop2_coreclkctl1;
+ I915_WRITE(MG_CLKTOP2_CORECLKCTL1(port), val);
+
+ val = I915_READ(MG_CLKTOP2_HSCLKCTL(port));
+ val &= ~(MG_CLKTOP2_HSCLKCTL_TLINEDRV_CLKSEL_MASK |
+ MG_CLKTOP2_HSCLKCTL_CORE_INPUTSEL_MASK |
+ MG_CLKTOP2_HSCLKCTL_HSDIV_RATIO_MASK |
+ MG_CLKTOP2_HSCLKCTL_DSDIV_RATIO_MASK);
+ val |= hw_state->mg_clktop2_hsclkctl;
+ I915_WRITE(MG_CLKTOP2_HSCLKCTL(port), val);
+
I915_WRITE(MG_PLL_DIV0(port), hw_state->mg_pll_div0);
I915_WRITE(MG_PLL_DIV1(port), hw_state->mg_pll_div1);
I915_WRITE(MG_PLL_LF(port), hw_state->mg_pll_lf);
--
2.13.2
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