drm: sti: remove gpio for HDMI hot plug detection

gpio used for HDMI hot plug detection is useless,
HDMI_STI register contains an hot plug detection status bit.
Fix binding documentation.

Signed-off-by: Benjamin Gaignard <benjamin.gaignard@linaro.org>

3 files changed, 5 insertions, 13 deletions

diff --git a/Documentation/devicetree/bindings/gpu/st,stih4xx.txt b/Documentation/devicetree/bindings/gpu/st,stih4xx.txt
index 8885d9e203fc..32cfc7b7631b 100644
--- a/Documentation/devicetree/bindings/gpu/st,stih4xx.txt
+++ b/Documentation/devicetree/bindings/gpu/st,stih4xx.txt
@@ -68,7 +68,6 @@ STMicroelectronics stih4xx platforms
     number of clocks may depend of the SoC type.
   - clock-names: names of the clocks listed in clocks property in the same
     order.
-  - hdmi,hpd-gpio: gpio id to detect if an hdmi cable is plugged or not.
   - ddc: phandle of an I2C controller used for DDC EDID probing
 
 sti-hda:
@@ -174,7 +173,6 @@ Example:
                                 interrupt-names = "irq";
                                 clock-names     = "pix", "tmds", "phy", "audio";
                                 clocks          = <&clockgen_c_vcc CLK_S_PIX_HDMI>, <&clockgen_c_vcc CLK_S_TMDS_HDMI>, <&clockgen_c_vcc CLK_S_HDMI_REJECT_PLL>, <&clockgen_b1 CLK_S_PCM_0>;
-                                hdmi,hpd-gpio   = <&PIO2 5>;
                         };
 
                         sti-hda@fe85a000 {
diff --git a/drivers/gpu/drm/sti/sti_hdmi.c b/drivers/gpu/drm/sti/sti_hdmi.c
index fed1b5fe4842..192119761c14 100644
--- a/drivers/gpu/drm/sti/sti_hdmi.c
+++ b/drivers/gpu/drm/sti/sti_hdmi.c
@@ -130,8 +130,7 @@ static irqreturn_t hdmi_irq_thread(int irq, void *arg)
 
         /* Hot plug/unplug IRQ */
         if (hdmi->irq_status & HDMI_INT_HOT_PLUG) {
-                /* read gpio to get the status */
-                hdmi->hpd = gpio_get_value(hdmi->hpd_gpio);
+                hdmi->hpd = readl(hdmi->regs + HDMI_STA) & HDMI_STA_HOT_PLUG;
                 if (hdmi->drm_dev)
                         drm_helper_hpd_irq_event(hdmi->drm_dev);
         }
@@ -766,13 +765,7 @@ static int sti_hdmi_probe(struct platform_device *pdev)
                 return PTR_ERR(hdmi->clk_audio);
         }
 
-        hdmi->hpd_gpio = of_get_named_gpio(np, "hdmi,hpd-gpio", 0);
-        if (hdmi->hpd_gpio < 0) {
-                DRM_ERROR("Failed to get hdmi hpd-gpio\n");
-                return -EIO;
-        }
-
-        hdmi->hpd = gpio_get_value(hdmi->hpd_gpio);
+        hdmi->hpd = readl(hdmi->regs + HDMI_STA) & HDMI_STA_HOT_PLUG;
 
         init_waitqueue_head(&hdmi->wait_event);
 
diff --git a/drivers/gpu/drm/sti/sti_hdmi.h b/drivers/gpu/drm/sti/sti_hdmi.h
index d00a3e0d807f..3d22390e1f3b 100644
--- a/drivers/gpu/drm/sti/sti_hdmi.h
+++ b/drivers/gpu/drm/sti/sti_hdmi.h
@@ -14,6 +14,9 @@
 #define HDMI_STA           0x0010
 #define HDMI_STA_DLL_LCK   BIT(5)
 
+#define HDMI_STA_HOT_PLUG_SHIFT 4
+#define HDMI_STA_HOT_PLUG       (1 << HDMI_STA_HOT_PLUG_SHIFT)
+
 struct sti_hdmi;
 
 struct hdmi_phy_ops {
@@ -37,7 +40,6 @@ struct hdmi_phy_ops {
  * @irq_status: interrupt status register
  * @phy_ops: phy start/stop operations
  * @enabled: true if hdmi is enabled else false
- * @hpd_gpio: hdmi hot plug detect gpio number
  * @hpd: hot plug detect status
  * @wait_event: wait event
  * @event_received: wait event status
@@ -57,7 +59,6 @@ struct sti_hdmi {
         u32 irq_status;
         struct hdmi_phy_ops *phy_ops;
         bool enabled;
-        int hpd_gpio;
         bool hpd;
         wait_queue_head_t wait_event;
         bool event_received;