[Intel-gfx] [PATCH 50/62] [v5] drm/i915/bdw: Support eDP PSR

[Kumar, Kiran S]

Hi Ben,

Can you please let me know the reason for explicit about not setting min link entry time for BDW. During my PSR testing on BDW, I found perf counter not getting increment and SRD control is setting to 0x0 with the following check:
 	IS_BROADWELL(dev) ? 0 : link_entry_time

When I remove and used only "link_entry_time" without check for BDW, PSR worked fine. (perf counter started incrementing)

Thanks
Kiran

-----Original Message-----
From: intel-gfx-bounces at lists.freedesktop.org [mailto:intel-gfx-bounces at lists.freedesktop.org] On Behalf Of Ben Widawsky
Sent: Tuesday, November 05, 2013 12:15 PM
To: Intel GFX
Cc: Nikula, Jani; Ben Widawsky; Widawsky, Benjamin
Subject: [Intel-gfx] [PATCH 50/62] [v5] drm/i915/bdw: Support eDP PSR

Broadwell PSR support is a superset of Haswell. With this simple register base calculation, everything that worked on HSW for eDP PSR should work on BDW.

Note that Broadwell provides additional PSR support. This is not addressed at this time.

v2: Make the HAS_PSR include BDW

v3: Use the correct offset (I had incorrectly used one from my faulty
brain) (Art!)

v4: It helps if you git add

v5: Be explicit about not setting min link entry time for BDW. This should be no functional change over v4 (Jani)

Reviewed-by: Art Runyan <arthur.j.runyan at intel.com>
Reviewed-by: Jani Nikula <jani.nikula at intel.com>
Signed-off-by: Ben Widawsky <ben at bwidawsk.net>
---
 drivers/gpu/drm/i915/i915_drv.h | 2 +-
 drivers/gpu/drm/i915/i915_reg.h | 4 ++--  drivers/gpu/drm/i915/intel_dp.c | 3 ++-
 3 files changed, 5 insertions(+), 4 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h index f222eb4..dc79a0f 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -1808,7 +1808,7 @@ struct drm_i915_file_private {
 #define HAS_DDI(dev)		(INTEL_INFO(dev)->has_ddi)
 #define HAS_POWER_WELL(dev)	(IS_HASWELL(dev) || IS_GEN8(dev))
 #define HAS_FPGA_DBG_UNCLAIMED(dev)	(INTEL_INFO(dev)->has_fpga_dbg)
-#define HAS_PSR(dev)		(IS_HASWELL(dev))
+#define HAS_PSR(dev)		(IS_HASWELL(dev) || IS_BROADWELL(dev))
 
 #define INTEL_PCH_DEVICE_ID_MASK		0xff00
 #define INTEL_PCH_IBX_DEVICE_ID_TYPE		0x3b00
diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h index ba1fe7e..3761c80 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -1959,8 +1959,8 @@
 #define BCLRPAT(pipe) _PIPE(pipe, _BCLRPAT_A, _BCLRPAT_B)  #define VSYNCSHIFT(trans) _TRANSCODER(trans, _VSYNCSHIFT_A, _VSYNCSHIFT_B)
 
-/* HSW eDP PSR registers */
-#define EDP_PSR_BASE(dev)			0x64800
+/* HSW+ eDP PSR registers */
+#define EDP_PSR_BASE(dev)                       (IS_HASWELL(dev) ? 0x64800 : 0x6f800)
 #define EDP_PSR_CTL(dev)			(EDP_PSR_BASE(dev) + 0)
 #define   EDP_PSR_ENABLE			(1<<31)
 #define   EDP_PSR_LINK_DISABLE			(0<<27)
diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c index 7725f81..6e4246f 100644
--- a/drivers/gpu/drm/i915/intel_dp.c
+++ b/drivers/gpu/drm/i915/intel_dp.c
@@ -1603,6 +1603,7 @@ static void intel_edp_psr_enable_source(struct intel_dp *intel_dp)
 	uint32_t max_sleep_time = 0x1f;
 	uint32_t idle_frames = 1;
 	uint32_t val = 0x0;
+	const uint32_t link_entry_time = EDP_PSR_MIN_LINK_ENTRY_TIME_8_LINES;
 
 	if (intel_dp->psr_dpcd[1] & DP_PSR_NO_TRAIN_ON_EXIT) {
 		val |= EDP_PSR_LINK_STANDBY;
@@ -1613,7 +1614,7 @@ static void intel_edp_psr_enable_source(struct intel_dp *intel_dp)
 		val |= EDP_PSR_LINK_DISABLE;
 
 	I915_WRITE(EDP_PSR_CTL(dev), val |
-		   EDP_PSR_MIN_LINK_ENTRY_TIME_8_LINES |
+		   IS_BROADWELL(dev) ? 0 : link_entry_time |
 		   max_sleep_time << EDP_PSR_MAX_SLEEP_TIME_SHIFT |
 		   idle_frames << EDP_PSR_IDLE_FRAME_SHIFT |
 		   EDP_PSR_ENABLE);
--
1.8.4.2

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