drm/i915: De-magic the PSR AUX message

Use pack_aux() to construct the PSR exit DPMS D0 AUX message,
and use the defines from dp_dp_helper.h to populate the message
contents.

v2: Use sizeof() for message size (Jani)
    Use a generic loop to write EDP_PSR_AUX_DATA registers

Cc: Jani Nikula <jani.nikula@linux.intel.com>
Cc: Rodrigo Vivi <rodrigo.vivi@gmail.com>
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index c62f3eb..607d7a5 100644 (file)
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -2503,9 +2503,7 @@ enum punit_power_well {
 
 #define EDP_PSR_AUX_CTL(dev)                   (EDP_PSR_BASE(dev) + 0x10)
 #define EDP_PSR_AUX_DATA1(dev)                 (EDP_PSR_BASE(dev) + 0x14)
-#define   EDP_PSR_DPCD_COMMAND         0x80060000
 #define EDP_PSR_AUX_DATA2(dev)                 (EDP_PSR_BASE(dev) + 0x18)
-#define   EDP_PSR_DPCD_NORMAL_OPERATION        (1<<24)
 #define EDP_PSR_AUX_DATA3(dev)                 (EDP_PSR_BASE(dev) + 0x1c)
 #define EDP_PSR_AUX_DATA4(dev)                 (EDP_PSR_BASE(dev) + 0x20)
 #define EDP_PSR_AUX_DATA5(dev)                 (EDP_PSR_BASE(dev) + 0x24)

diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
index 205363a..7ba3e1b 100644 (file)
--- a/drivers/gpu/drm/i915/intel_dp.c
+++ b/drivers/gpu/drm/i915/intel_dp.c
@@ -225,7 +225,7 @@ intel_dp_mode_valid(struct drm_connector *connector,
 }
 
 static uint32_t
-pack_aux(uint8_t *src, int src_bytes)
+pack_aux(const uint8_t *src, int src_bytes)
 {
        int     i;
        uint32_t v = 0;
@@ -2045,8 +2045,17 @@ static void intel_edp_psr_enable_sink(struct intel_dp *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) */
        bool only_standby = false;
+       static const uint8_t aux_msg[] = {
+               [0] = DP_AUX_NATIVE_WRITE << 4,
+               [1] = DP_SET_POWER >> 8,
+               [2] = DP_SET_POWER & 0xff,
+               [3] = 1 - 1,
+               [4] = DP_SET_POWER_D0,
+       };
+       int i;
+
+       BUILD_BUG_ON(sizeof(aux_msg) > 20);
 
        aux_clock_divider = intel_dp->get_aux_clock_divider(intel_dp, 0);
 
@@ -2062,11 +2071,13 @@ static void intel_edp_psr_enable_sink(struct intel_dp *intel_dp)
                                   DP_PSR_ENABLE | DP_PSR_MAIN_LINK_ACTIVE);
 
        /* Setup AUX registers */
-       I915_WRITE(EDP_PSR_AUX_DATA1(dev), EDP_PSR_DPCD_COMMAND);
-       I915_WRITE(EDP_PSR_AUX_DATA2(dev), EDP_PSR_DPCD_NORMAL_OPERATION);
+       for (i = 0; i < sizeof(aux_msg); i += 4)
+               I915_WRITE(EDP_PSR_AUX_DATA1(dev) + i,
+                          pack_aux(&aux_msg[i], sizeof(aux_msg) - i));
+
        I915_WRITE(EDP_PSR_AUX_CTL(dev),
                   DP_AUX_CH_CTL_TIME_OUT_400us |
-                  (msg_size << DP_AUX_CH_CTL_MESSAGE_SIZE_SHIFT) |
+                  (sizeof(aux_msg) << 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));
 }