Re: [PATCH 2/5] drm/i915/display/adlp: Add new PSR2 workarounds

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On 9/13/21 8:00 PM, Souza, Jose wrote:
On Mon, 2021-09-13 at 19:09 +0300, Gwan-gyeong Mun wrote:

On 9/10/21 7:29 PM, Souza, Jose wrote:
On Fri, 2021-09-10 at 16:38 +0300, Gwan-gyeong Mun wrote:

On 9/10/21 2:07 AM, José Roberto de Souza wrote:
Wa_16014451276 fixes the starting coordinate for PSR2 selective
updates. CHICKEN_TRANS definition of the workaround bit has a wrong
name based on workaround definition and HSD.

Wa_14014971508 allows the screen to continue to be updated when
coming back from DC5/DC6 and SF_SINGLE_FULL_FRAME bit is not kept
set in PSR2_MAN_TRK_CTL.

Wa_16012604467 fixes underruns when exiting PSR2 when it is in one
of its internal states.

Wa_14014971508 is still in pending status in BSpec but by
the time this is reviewed and ready to be merged it will be finalized.

BSpec: 54369
BSpec: 50054
Cc: Gwan-gyeong Mun <gwan-gyeong.mun@xxxxxxxxx>
Signed-off-by: José Roberto de Souza <jose.souza@xxxxxxxxx>
---
    drivers/gpu/drm/i915/display/intel_psr.c | 23 ++++++++++++++++++++++-
    drivers/gpu/drm/i915/i915_reg.h          |  4 ++++
    2 files changed, 26 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/i915/display/intel_psr.c b/drivers/gpu/drm/i915/display/intel_psr.c
index 36816abb3bcc0..92c0b2159559f 100644
--- a/drivers/gpu/drm/i915/display/intel_psr.c
+++ b/drivers/gpu/drm/i915/display/intel_psr.c
@@ -1086,6 +1086,12 @@ static void intel_psr_enable_source(struct intel_dp *intel_dp)
    intel_de_write(dev_priv, reg, chicken);
    }

+/* Wa_16014451276:adlp */
+if (IS_ALDERLAKE_P(dev_priv) &&
+    intel_dp->psr.psr2_enabled)
+intel_de_rmw(dev_priv, CHICKEN_TRANS(cpu_transcoder), 0,
+     D13_1_BASED_X_GRANULARITY);
Depending on the capability of the PSR panel, the following setting may
not be necessary, could you add some comments such as "force enable
1-based X granularity on PSR2 VSC SDP"?

It was made sure that all alderlake-P BOM panels will have 1-based X granularity, I can add something like that.


+
    /*
     * Per Spec: Avoid continuous PSR exit by masking MEMUP and HPD also
     * mask LPSP to avoid dependency on other drivers that might block
@@ -1131,6 +1137,11 @@ static void intel_psr_enable_source(struct intel_dp *intel_dp)
         TRANS_SET_CONTEXT_LATENCY(intel_dp->psr.transcoder),
         TRANS_SET_CONTEXT_LATENCY_MASK,
         TRANS_SET_CONTEXT_LATENCY_VALUE(1));
+
+/* Wa_16012604467:adlp */
+if (IS_ALDERLAKE_P(dev_priv) && intel_dp->psr.psr2_enabled)
+intel_de_rmw(dev_priv, CLKGATE_DIS_MISC, 0,
+     CLKGATE_DIS_MISC_DMASC_GATING_DIS);
    }

    static bool psr_interrupt_error_check(struct intel_dp *intel_dp)
@@ -1320,6 +1331,11 @@ static void intel_psr_disable_locked(struct intel_dp *intel_dp)
         TRANS_SET_CONTEXT_LATENCY(intel_dp->psr.transcoder),
         TRANS_SET_CONTEXT_LATENCY_MASK, 0);

+/* Wa_16012604467:adlp */
+if (IS_ALDERLAKE_P(dev_priv) && intel_dp->psr.psr2_enabled)
+intel_de_rmw(dev_priv, CLKGATE_DIS_MISC,
+     CLKGATE_DIS_MISC_DMASC_GATING_DIS, 0);
+
    intel_snps_phy_update_psr_power_state(dev_priv, phy, false);

    /* Disable PSR on Sink */
@@ -1488,8 +1504,13 @@ static void psr2_man_trk_ctl_calc(struct intel_crtc_state *crtc_state,
    u32 val = PSR2_MAN_TRK_CTL_ENABLE;

    if (full_update) {
+/*
+ * Wa_14014971508:adlp
+ * SINGLE_FULL_FRAME bit is not hold in register so can not be
+ * restored by DMC, so using CONTINUOS_FULL_FRAME to mimic that
+ */
    if (IS_ALDERLAKE_P(dev_priv))
-val |= ADLP_PSR2_MAN_TRK_CTL_SF_SINGLE_FULL_FRAME;
+val |= ADLP_PSR2_MAN_TRK_CTL_SF_CONTINUOS_FULL_FRAME;
    else
    val |= PSR2_MAN_TRK_CTL_SF_SINGLE_FULL_FRAME;

diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index c2853cc005ee6..0de2f7541da6c 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -8235,6 +8235,7 @@ enum {
    #define  VSC_DATA_SEL_SOFTWARE_CONTROLREG_BIT(25) /* GLK */
    #define  FECSTALL_DIS_DPTSTREAM_DPTTGREG_BIT(23)
    #define  DDI_TRAINING_OVERRIDE_ENABLEREG_BIT(19)
+#define  D13_1_BASED_X_GRANULARITYREG_BIT(18)
The meaning of this macro is to set "force enable 1-based X granularity
on PSR2 VSC SDP" in Display 13.1 ADL, so the meaning of the macro may be
a little ambiguous.

The name of registers are set to match specification name as close as possible not the use or meaning.
Yes, just looking at the macro, I thought that it could be interpreted
in two ways: D13 / 1_BASED_X_GRANULARITY or D13_1 / BASED_X_GRANULARITY.
If our macro naming convention is fine in this case, then I don't think
the code is the problem either.

Okay yes someone could interpret into those 2 ways but checking bspec makes it clears that it is the first one.
I can rename to ADLP_1_BASED_X_GRANULARITY if you think it would make it better.

the ADLP_1_BASED_X_GRANULARITY you suggested looks better.

    #define  DDI_TRAINING_OVERRIDE_VALUEREG_BIT(18)
    #define  DDIE_TRAINING_OVERRIDE_ENABLEREG_BIT(17) /* CHICKEN_TRANS_A only */
    #define  DDIE_TRAINING_OVERRIDE_VALUEREG_BIT(16) /* CHICKEN_TRANS_A only */
@@ -12789,4 +12790,7 @@ enum skl_power_gate {
    #define CLKREQ_POLICY_MMIO(0x101038)
    #define  CLKREQ_POLICY_MEM_UP_OVRDREG_BIT(1)

+#define CLKGATE_DIS_MISC_MMIO(0x46534)
+#define  CLKGATE_DIS_MISC_DMASC_GATING_DISREG_BIT(21)
+
    #endif /* _I915_REG_H_ */






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