From: Yakir Yang <y...@rock-chips.com>

Make sure the request PSR state takes effect in analogix_dp_send_psr_spd()
function, or print the sink PSR error state if we failed to apply the
requested PSR setting.

Cc: 征增 王 <w...@rock-chips.com>
Cc: Stéphane Marchesin <marc...@chromium.org>
Signed-off-by: Yakir Yang <y...@rock-chips.com>
[seanpaul changed timeout loop to a readx poll]
Signed-off-by: Sean Paul <seanp...@chromium.org>
Signed-off-by: Thierry Escande <thierry.esca...@collabora.com>
Signed-off-by: Enric Balletbo i Serra <enric.balle...@collabora.com>
---

 drivers/gpu/drm/bridge/analogix/analogix_dp_core.c |  6 ++--
 drivers/gpu/drm/bridge/analogix/analogix_dp_core.h |  6 ++--
 drivers/gpu/drm/bridge/analogix/analogix_dp_reg.c  | 35 +++++++++++++++++++---
 3 files changed, 37 insertions(+), 10 deletions(-)

diff --git a/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c 
b/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c
index a693ab3078f0..e738aa6de1af 100644
--- a/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c
+++ b/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c
@@ -122,8 +122,7 @@ int analogix_dp_enable_psr(struct analogix_dp_device *dp)
        psr_vsc.DB0 = 0;
        psr_vsc.DB1 = EDP_VSC_PSR_STATE_ACTIVE | EDP_VSC_PSR_CRC_VALUES_VALID;
 
-       analogix_dp_send_psr_spd(dp, &psr_vsc);
-       return 0;
+       return analogix_dp_send_psr_spd(dp, &psr_vsc);
 }
 EXPORT_SYMBOL_GPL(analogix_dp_enable_psr);
 
@@ -149,8 +148,7 @@ int analogix_dp_disable_psr(struct analogix_dp_device *dp)
        if (ret != 1)
                dev_err(dp->dev, "Failed to set DP Power0 %d\n", ret);
 
-       analogix_dp_send_psr_spd(dp, &psr_vsc);
-       return 0;
+       return analogix_dp_send_psr_spd(dp, &psr_vsc);
 }
 EXPORT_SYMBOL_GPL(analogix_dp_disable_psr);
 
diff --git a/drivers/gpu/drm/bridge/analogix/analogix_dp_core.h 
b/drivers/gpu/drm/bridge/analogix/analogix_dp_core.h
index 5c6a28806129..b039b28d8fcc 100644
--- a/drivers/gpu/drm/bridge/analogix/analogix_dp_core.h
+++ b/drivers/gpu/drm/bridge/analogix/analogix_dp_core.h
@@ -20,6 +20,8 @@
 #define MAX_CR_LOOP 5
 #define MAX_EQ_LOOP 5
 
+#define DP_TIMEOUT_PSR_LOOP_MS                 300
+
 /* DP_MAX_LANE_COUNT */
 #define DPCD_ENHANCED_FRAME_CAP(x)             (((x) >> 7) & 0x1)
 #define DPCD_MAX_LANE_COUNT(x)                 ((x) & 0x1f)
@@ -247,8 +249,8 @@ void analogix_dp_config_video_slave_mode(struct 
analogix_dp_device *dp);
 void analogix_dp_enable_scrambling(struct analogix_dp_device *dp);
 void analogix_dp_disable_scrambling(struct analogix_dp_device *dp);
 void analogix_dp_enable_psr_crc(struct analogix_dp_device *dp);
-void analogix_dp_send_psr_spd(struct analogix_dp_device *dp,
-                             struct edp_vsc_psr *vsc);
+int analogix_dp_send_psr_spd(struct analogix_dp_device *dp,
+                            struct edp_vsc_psr *vsc);
 ssize_t analogix_dp_transfer(struct analogix_dp_device *dp,
                             struct drm_dp_aux_msg *msg);
 
diff --git a/drivers/gpu/drm/bridge/analogix/analogix_dp_reg.c 
b/drivers/gpu/drm/bridge/analogix/analogix_dp_reg.c
index 303083ad28e3..005a3f7005d2 100644
--- a/drivers/gpu/drm/bridge/analogix/analogix_dp_reg.c
+++ b/drivers/gpu/drm/bridge/analogix/analogix_dp_reg.c
@@ -10,10 +10,11 @@
  * option) any later version.
  */
 
-#include <linux/device.h>
-#include <linux/io.h>
 #include <linux/delay.h>
+#include <linux/device.h>
 #include <linux/gpio.h>
+#include <linux/io.h>
+#include <linux/iopoll.h>
 
 #include <drm/bridge/analogix_dp.h>
 
@@ -992,10 +993,25 @@ void analogix_dp_enable_psr_crc(struct analogix_dp_device 
*dp)
        writel(PSR_VID_CRC_ENABLE, dp->reg_base + ANALOGIX_DP_CRC_CON);
 }
 
-void analogix_dp_send_psr_spd(struct analogix_dp_device *dp,
-                             struct edp_vsc_psr *vsc)
+static ssize_t analogix_dp_get_psr_status(struct analogix_dp_device *dp)
+{
+       ssize_t val;
+       u8 status;
+
+       val = drm_dp_dpcd_readb(&dp->aux, DP_PSR_STATUS, &status);
+       if (val < 0) {
+               dev_err(dp->dev, "PSR_STATUS read failed ret=%zd", val);
+               return val;
+       }
+       return status;
+}
+
+int analogix_dp_send_psr_spd(struct analogix_dp_device *dp,
+                            struct edp_vsc_psr *vsc)
 {
        unsigned int val;
+       int ret;
+       ssize_t psr_status;
 
        /* don't send info frame */
        val = readl(dp->reg_base + ANALOGIX_DP_PKT_SEND_CTL);
@@ -1036,6 +1052,17 @@ void analogix_dp_send_psr_spd(struct analogix_dp_device 
*dp,
        val = readl(dp->reg_base + ANALOGIX_DP_PKT_SEND_CTL);
        val |= IF_EN;
        writel(val, dp->reg_base + ANALOGIX_DP_PKT_SEND_CTL);
+
+       ret = readx_poll_timeout(analogix_dp_get_psr_status, dp, psr_status,
+               psr_status >= 0 &&
+               ((vsc->DB1 && psr_status == DP_PSR_SINK_ACTIVE_RFB) ||
+               (!vsc->DB1 && psr_status == DP_PSR_SINK_INACTIVE)), 1500,
+               DP_TIMEOUT_PSR_LOOP_MS * 1000);
+       if (ret) {
+               dev_warn(dp->dev, "Failed to apply PSR %d\n", ret);
+               return ret;
+       }
+       return 0;
 }
 
 ssize_t analogix_dp_transfer(struct analogix_dp_device *dp,
-- 
2.16.1

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