[Intel-gfx] [PATCH 5/9] drm/i915: Setup EDP PSR AUX Registers
Rodrigo Vivi
rodrigo.vivi at gmail.com
Wed Jan 30 19:24:47 CET 2013
From: Shobhit Kumar <shobhit.kumar at intel.com>
Signed-off-by: Shobhit Kumar <shobhit.kumar at intel.com>
v2: Created aux_clock_divider function to avoid duplicated code.
Unfortunatelly dp_aux_ch and psr_aux_ch aren't so similar to reuse full code.
Signed-off-by: Rodrigo Vivi <rodrigo.vivi at gmail.com>
---
drivers/gpu/drm/i915/i915_reg.h | 13 ++++++
drivers/gpu/drm/i915/intel_dp.c | 89 +++++++++++++++++++++++++++++++---------
drivers/gpu/drm/i915/intel_drv.h | 1 +
3 files changed, 83 insertions(+), 20 deletions(-)
diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index 7bb3134..10732dc 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -1563,6 +1563,19 @@
#define BCLRPAT(pipe) _PIPE(pipe, _BCLRPAT_A, _BCLRPAT_B)
#define VSYNCSHIFT(trans) _TRANSCODER(trans, _VSYNCSHIFT_A, _VSYNCSHIFT_B)
+#define EDP_PSR_AUX_CTL 0x64810
+#define EDP_PSR_AUX_DATA1 0x64814
+#define EDP_PSR_AUX_DATA2 0x64818
+#define EDP_PSR_AUX_DATA3 0x6481c
+#define EDP_PSR_AUX_DATA4 0x64820
+#define EDP_PSR_AUX_DATA5 0x64824
+#define EDP_PSR_STATUS_CTL 0x64840
+#define EDP_PSR_STATUS_MASK (7<<29)
+#define EDP_PSR_PERF_CNT 0x64844
+#define EDP_PSR_DEBUG_CTL 0x64860
+#define EDP_PSR_DEBUG_MASK_MEMUP (1<<26)
+#define EDP_PSR_DEBUG_MASK_HPD (1<<25)
+
/* VGA port control */
#define ADPA 0x61100
#define PCH_ADPA 0xe1100
diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
index aeb0ef1..fe83e05 100644
--- a/drivers/gpu/drm/i915/intel_dp.c
+++ b/drivers/gpu/drm/i915/intel_dp.c
@@ -364,6 +364,34 @@ intel_dp_aux_wait_done(struct intel_dp *intel_dp, bool has_aux_irq)
return status;
}
+static uint32_t get_aux_clock_divider(struct intel_dp *intel_dp)
+{
+ struct intel_digital_port *intel_dig_port = dp_to_dig_port(intel_dp);
+ struct drm_device *dev = intel_dig_port->base.base.dev;
+ struct drm_i915_private *dev_priv = dev->dev_private;
+
+ /* The clock divider is based off the hrawclk,
+ * and would like to run at 2MHz. So, take the
+ * hrawclk value and divide by 2 and use that
+ *
+ * Note that PCH attached eDP panels should use a 125MHz input
+ * clock divider.
+ */
+ if (is_cpu_edp(intel_dp)) {
+ if (HAS_DDI(dev))
+ return intel_ddi_get_cdclk_freq(dev_priv) >> 1;
+ else if (IS_VALLEYVIEW(dev))
+ return 100;
+ else if (IS_GEN6(dev) || IS_GEN7(dev))
+ return 200; /* SNB & IVB eDP input clock at 400Mhz */
+ else
+ return 225; /* eDP input clock at 450Mhz */
+ } else if (HAS_PCH_SPLIT(dev))
+ return DIV_ROUND_UP(intel_pch_rawclk(dev), 2);
+ else
+ return intel_hrawclk(dev) / 2;
+}
+
static int
intel_dp_aux_ch(struct intel_dp *intel_dp,
uint8_t *send, int send_bytes,
@@ -411,26 +439,7 @@ intel_dp_aux_ch(struct intel_dp *intel_dp,
}
intel_dp_check_edp(intel_dp);
- /* The clock divider is based off the hrawclk,
- * and would like to run at 2MHz. So, take the
- * hrawclk value and divide by 2 and use that
- *
- * Note that PCH attached eDP panels should use a 125MHz input
- * clock divider.
- */
- if (is_cpu_edp(intel_dp)) {
- if (HAS_DDI(dev))
- aux_clock_divider = intel_ddi_get_cdclk_freq(dev_priv) >> 1;
- else if (IS_VALLEYVIEW(dev))
- aux_clock_divider = 100;
- else if (IS_GEN6(dev) || IS_GEN7(dev))
- aux_clock_divider = 200; /* SNB & IVB eDP input clock at 400Mhz */
- else
- aux_clock_divider = 225; /* eDP input clock at 450Mhz */
- } else if (HAS_PCH_SPLIT(dev))
- aux_clock_divider = DIV_ROUND_UP(intel_pch_rawclk(dev), 2);
- else
- aux_clock_divider = intel_hrawclk(dev) / 2;
+ aux_clock_divider = get_aux_clock_divider(intel_dp);
if (IS_GEN6(dev))
precharge = 3;
@@ -1440,6 +1449,46 @@ static bool is_edp_psr(struct intel_dp *intel_dp)
return (is_edp(intel_dp) && (intel_dp->psr_dpcd[0] & 0x1));
}
+static void intel_edp_psr_setup(struct intel_dp *intel_dp)
+{
+ struct drm_device *dev = intel_dp_to_dev(intel_dp);
+ struct drm_i915_private *dev_priv = dev->dev_private;
+ uint32_t aux_clock_divider;
+ int precharge = 0x3;
+ int msg_size = 5; /* Header(4) + Message(1) */
+
+ /* No need to setup if already done as these setting are persistent
+ * until power states are entered */
+ if (intel_dp->psr_setup)
+ return;
+
+ /* Setup AUX registers */
+ /* Write command on DPCD 0x0600 */
+ I915_WRITE(EDP_PSR_AUX_DATA1, 0x80060000);
+
+ /* Set the state to normal operation D0 in DPCD 0x0600 */
+ I915_WRITE(EDP_PSR_AUX_DATA2, 0x01000000);
+
+ aux_clock_divider = get_aux_clock_divider(intel_dp);
+
+ I915_WRITE(EDP_PSR_AUX_CTL,
+ DP_AUX_CH_CTL_TIME_OUT_400us |
+ (msg_size << DP_AUX_CH_CTL_MESSAGE_SIZE_SHIFT) |
+ (precharge << DP_AUX_CH_CTL_PRECHARGE_2US_SHIFT) |
+ (aux_clock_divider << DP_AUX_CH_CTL_BIT_CLOCK_2X_SHIFT));
+
+ /* Setup the debug register */
+ I915_WRITE(EDP_PSR_DEBUG_CTL, I915_READ(EDP_PSR_DEBUG_CTL) |
+ EDP_PSR_DEBUG_MASK_MEMUP |
+ EDP_PSR_DEBUG_MASK_HPD);
+
+ /* This flag can be made to 0 from pm code so as to reinitialize the
+ * AUX register in case of power states, returning from which will not
+ * maintain the AUX register settings
+ */
+ intel_dp->psr_setup = 1;
+}
+
static void intel_enable_dp(struct intel_encoder *encoder)
{
struct intel_dp *intel_dp = enc_to_intel_dp(&encoder->base);
diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h
index d4b3bac..3fa2dd0 100644
--- a/drivers/gpu/drm/i915/intel_drv.h
+++ b/drivers/gpu/drm/i915/intel_drv.h
@@ -383,6 +383,7 @@ struct intel_dp {
int backlight_on_delay;
int backlight_off_delay;
struct delayed_work panel_vdd_work;
+ uint8_t psr_setup;
bool want_panel_vdd;
struct intel_connector *attached_connector;
};
--
1.7.11.7
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