drm/i915/psr: Preserve SRD_CTL bit 29 on PSR init

Bit 29 of SRD_CTL needs to have its value preserved according to the
B-Spec, so right before we write out the register we go ahead and read
the register and preserve the value of that bit before we write out
the configured register value.

v2: Spaces => tabs, minor name change, and commit message wording (Rodrigo)

Cc: Rodrigo Vivi <rodrigo.vivi@intel.com>
Cc: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Jani Nikula <jani.nikula@intel.com>
Signed-off-by: Jim Bride <jim.bride@linux.intel.com>
Reviewed-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/1502229094-13392-1-git-send-email-jim.bride@linux.intel.com

diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index b2546ad..56df86e 100644 (file)
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -3872,6 +3872,7 @@ enum {
 #define EDP_PSR_CTL                            _MMIO(dev_priv->psr_mmio_base + 0)
 #define   EDP_PSR_ENABLE                       (1<<31)
 #define   BDW_PSR_SINGLE_FRAME                 (1<<30)
+#define   EDP_PSR_RESTORE_PSR_ACTIVE_CTX_MASK  (1<<29) /* SW can't modify */
 #define   EDP_PSR_LINK_STANDBY                 (1<<27)
 #define   EDP_PSR_MIN_LINK_ENTRY_TIME_MASK     (3<<25)
 #define   EDP_PSR_MIN_LINK_ENTRY_TIME_8_LINES  (0<<25)

diff --git a/drivers/gpu/drm/i915/intel_psr.c b/drivers/gpu/drm/i915/intel_psr.c
index 559f1ab..1b31ab0 100644 (file)
--- a/drivers/gpu/drm/i915/intel_psr.c
+++ b/drivers/gpu/drm/i915/intel_psr.c
@@ -315,6 +315,7 @@ static void intel_enable_source_psr1(struct intel_dp *intel_dp)
        else
                val |= EDP_PSR_TP1_TP2_SEL;
 
+       val |= I915_READ(EDP_PSR_CTL) & EDP_PSR_RESTORE_PSR_ACTIVE_CTX_MASK;
        I915_WRITE(EDP_PSR_CTL, val);
 }