[PATCH] drm/vc4: Add runtime PM support to the HDMI encoder driver
Boris Brezillon
boris.brezillon at free-electrons.com
Tue Apr 11 16:39:25 UTC 2017
The HDMI driver is currently enabling all clks and probe time and keep
the power-domain connected to the HDMI encoder enabled.
Move all activation code to vc4_hdmi_encoder_enable() and make sure
the clks and power domain are released when the HDMI encoder is not used
by adding deactivation steps in vc4_hdmi_encoder_disable().
Note that the sequencing imposed by the IP requires that we move
vc4_hdmi_encoder_mode_set() code into vc4_hdmi_encoder_enable().
Signed-off-by: Boris Brezillon <boris.brezillon at free-electrons.com>
---
Hi Eric,
As for the previous submission, I first send a preliminary version of
the patch for internal review.
Let me know if you want me to submit this patch.
Regards,
Boris
drivers/gpu/drm/vc4/vc4_hdmi.c | 174 ++++++++++++++++++++++-------------------
1 file changed, 92 insertions(+), 82 deletions(-)
diff --git a/drivers/gpu/drm/vc4/vc4_hdmi.c b/drivers/gpu/drm/vc4/vc4_hdmi.c
index 93d5994f3a04..08085e137ae3 100644
--- a/drivers/gpu/drm/vc4/vc4_hdmi.c
+++ b/drivers/gpu/drm/vc4/vc4_hdmi.c
@@ -33,6 +33,7 @@
#include "linux/i2c.h"
#include "linux/of_gpio.h"
#include "linux/of_platform.h"
+#include "linux/pm_runtime.h"
#include "vc4_drv.h"
#include "vc4_regs.h"
@@ -387,13 +388,38 @@ static void vc4_hdmi_set_infoframes(struct drm_encoder *encoder)
vc4_hdmi_set_spd_infoframe(encoder);
}
-static void vc4_hdmi_encoder_mode_set(struct drm_encoder *encoder,
- struct drm_display_mode *unadjusted_mode,
- struct drm_display_mode *mode)
+static void vc4_hdmi_encoder_disable(struct drm_encoder *encoder)
+{
+ struct drm_device *dev = encoder->dev;
+ struct vc4_dev *vc4 = to_vc4_dev(dev);
+ struct vc4_hdmi *hdmi = vc4->hdmi;
+ int ret;
+
+ HDMI_WRITE(VC4_HDMI_RAM_PACKET_CONFIG, 0);
+
+ HDMI_WRITE(VC4_HDMI_TX_PHY_RESET_CTL, 0xf << 16);
+ HD_WRITE(VC4_HD_VID_CTL,
+ HD_READ(VC4_HD_VID_CTL) & ~VC4_HD_VID_CTL_ENABLE);
+
+ HD_WRITE(VC4_HD_M_CTL, VC4_HD_M_SW_RST);
+ udelay(1);
+ HD_WRITE(VC4_HD_M_CTL, 0);
+
+ clk_disable_unprepare(hdmi->hsm_clock);
+ clk_disable_unprepare(hdmi->pixel_clock);
+
+ ret = pm_runtime_put(&hdmi->pdev->dev);
+ if (ret < 0)
+ DRM_ERROR("Failed to release power domain: %d\n", ret);
+}
+
+static void vc4_hdmi_encoder_enable(struct drm_encoder *encoder)
{
+ struct drm_display_mode *mode = &encoder->crtc->state->adjusted_mode;
struct vc4_hdmi_encoder *vc4_encoder = to_vc4_hdmi_encoder(encoder);
struct drm_device *dev = encoder->dev;
struct vc4_dev *vc4 = to_vc4_dev(dev);
+ struct vc4_hdmi *hdmi = vc4->hdmi;
bool debug_dump_regs = false;
bool hsync_pos = mode->flags & DRM_MODE_FLAG_PHSYNC;
bool vsync_pos = mode->flags & DRM_MODE_FLAG_PVSYNC;
@@ -413,6 +439,64 @@ static void vc4_hdmi_encoder_mode_set(struct drm_encoder *encoder,
interlaced,
VC4_HDMI_VERTB_VBP));
u32 csc_ctl;
+ int ret;
+
+ ret = pm_runtime_get_sync(&hdmi->pdev->dev);
+ if (ret < 0) {
+ DRM_ERROR("Failed to retain power domain: %d\n", ret);
+ return;
+ }
+
+ /* This is the rate that is set by the firmware. The number
+ * needs to be a bit higher than the pixel clock rate
+ * (generally 148.5Mhz).
+ */
+ ret = clk_set_rate(hdmi->hsm_clock, 163682864);
+ if (ret) {
+ DRM_ERROR("Failed to set HSM clock rate: %d\n", ret);
+ return;
+ }
+
+ ret = clk_set_rate(hdmi->pixel_clock,
+ mode->clock * 1000 *
+ ((mode->flags & DRM_MODE_FLAG_DBLCLK) ? 2 : 1));
+ if (ret) {
+ DRM_ERROR("Failed to set pixel clock rate: %d\n", ret);
+ return;
+ }
+
+ ret = clk_prepare_enable(hdmi->pixel_clock);
+ if (ret) {
+ DRM_ERROR("Failed to turn on pixel clock: %d\n", ret);
+ return;
+ }
+
+ ret = clk_prepare_enable(hdmi->hsm_clock);
+ if (ret) {
+ DRM_ERROR("Failed to turn on HDMI state machine clock: %d\n",
+ ret);
+ clk_disable_unprepare(hdmi->pixel_clock);
+ return;
+ }
+
+ HD_WRITE(VC4_HD_M_CTL, VC4_HD_M_SW_RST);
+ udelay(1);
+ HD_WRITE(VC4_HD_M_CTL, 0);
+
+ HD_WRITE(VC4_HD_M_CTL, VC4_HD_M_ENABLE);
+
+ HDMI_WRITE(VC4_HDMI_SW_RESET_CONTROL,
+ VC4_HDMI_SW_RESET_HDMI |
+ VC4_HDMI_SW_RESET_FORMAT_DETECT);
+
+ HDMI_WRITE(VC4_HDMI_SW_RESET_CONTROL, 0);
+
+ /* PHY should be in reset, like
+ * vc4_hdmi_encoder_disable() does.
+ */
+ HDMI_WRITE(VC4_HDMI_TX_PHY_RESET_CTL, 0xf << 16);
+
+ HDMI_WRITE(VC4_HDMI_TX_PHY_RESET_CTL, 0);
if (debug_dump_regs) {
DRM_INFO("HDMI regs before:\n");
@@ -421,9 +505,6 @@ static void vc4_hdmi_encoder_mode_set(struct drm_encoder *encoder,
HD_WRITE(VC4_HD_VID_CTL, 0);
- clk_set_rate(vc4->hdmi->pixel_clock, mode->clock * 1000 *
- ((mode->flags & DRM_MODE_FLAG_DBLCLK) ? 2 : 1));
-
HDMI_WRITE(VC4_HDMI_SCHEDULER_CONTROL,
HDMI_READ(VC4_HDMI_SCHEDULER_CONTROL) |
VC4_HDMI_SCHEDULER_CONTROL_MANUAL_FORMAT |
@@ -497,28 +578,6 @@ static void vc4_hdmi_encoder_mode_set(struct drm_encoder *encoder,
DRM_INFO("HDMI regs after:\n");
vc4_hdmi_dump_regs(dev);
}
-}
-
-static void vc4_hdmi_encoder_disable(struct drm_encoder *encoder)
-{
- struct drm_device *dev = encoder->dev;
- struct vc4_dev *vc4 = to_vc4_dev(dev);
-
- HDMI_WRITE(VC4_HDMI_RAM_PACKET_CONFIG, 0);
-
- HDMI_WRITE(VC4_HDMI_TX_PHY_RESET_CTL, 0xf << 16);
- HD_WRITE(VC4_HD_VID_CTL,
- HD_READ(VC4_HD_VID_CTL) & ~VC4_HD_VID_CTL_ENABLE);
-}
-
-static void vc4_hdmi_encoder_enable(struct drm_encoder *encoder)
-{
- struct vc4_hdmi_encoder *vc4_encoder = to_vc4_hdmi_encoder(encoder);
- struct drm_device *dev = encoder->dev;
- struct vc4_dev *vc4 = to_vc4_dev(dev);
- int ret;
-
- HDMI_WRITE(VC4_HDMI_TX_PHY_RESET_CTL, 0);
HD_WRITE(VC4_HD_VID_CTL,
HD_READ(VC4_HD_VID_CTL) |
@@ -584,7 +643,6 @@ static void vc4_hdmi_encoder_enable(struct drm_encoder *encoder)
}
static const struct drm_encoder_helper_funcs vc4_hdmi_encoder_helper_funcs = {
- .mode_set = vc4_hdmi_encoder_mode_set,
.disable = vc4_hdmi_encoder_disable,
.enable = vc4_hdmi_encoder_enable,
};
@@ -644,33 +702,6 @@ static int vc4_hdmi_bind(struct device *dev, struct device *master, void *data)
return -EPROBE_DEFER;
}
- /* Enable the clocks at startup. We can't quite recover from
- * turning off the pixel clock during disable/enables yet, so
- * it's always running.
- */
- ret = clk_prepare_enable(hdmi->pixel_clock);
- if (ret) {
- DRM_ERROR("Failed to turn on pixel clock: %d\n", ret);
- goto err_put_i2c;
- }
-
- /* This is the rate that is set by the firmware. The number
- * needs to be a bit higher than the pixel clock rate
- * (generally 148.5Mhz).
- */
- ret = clk_set_rate(hdmi->hsm_clock, 163682864);
- if (ret) {
- DRM_ERROR("Failed to set HSM clock rate: %d\n", ret);
- goto err_unprepare_pix;
- }
-
- ret = clk_prepare_enable(hdmi->hsm_clock);
- if (ret) {
- DRM_ERROR("Failed to turn on HDMI state machine clock: %d\n",
- ret);
- goto err_unprepare_pix;
- }
-
/* Only use the GPIO HPD pin if present in the DT, otherwise
* we'll use the HDMI core's register.
*/
@@ -682,7 +713,7 @@ static int vc4_hdmi_bind(struct device *dev, struct device *master, void *data)
&hpd_gpio_flags);
if (hdmi->hpd_gpio < 0) {
ret = hdmi->hpd_gpio;
- goto err_unprepare_hsm;
+ goto err_put_i2c;
}
hdmi->hpd_active_low = hpd_gpio_flags & OF_GPIO_ACTIVE_LOW;
@@ -690,25 +721,7 @@ static int vc4_hdmi_bind(struct device *dev, struct device *master, void *data)
vc4->hdmi = hdmi;
- /* HDMI core must be enabled. */
- if (!(HD_READ(VC4_HD_M_CTL) & VC4_HD_M_ENABLE)) {
- HD_WRITE(VC4_HD_M_CTL, VC4_HD_M_SW_RST);
- udelay(1);
- HD_WRITE(VC4_HD_M_CTL, 0);
-
- HD_WRITE(VC4_HD_M_CTL, VC4_HD_M_ENABLE);
-
- HDMI_WRITE(VC4_HDMI_SW_RESET_CONTROL,
- VC4_HDMI_SW_RESET_HDMI |
- VC4_HDMI_SW_RESET_FORMAT_DETECT);
-
- HDMI_WRITE(VC4_HDMI_SW_RESET_CONTROL, 0);
-
- /* PHY should be in reset, like
- * vc4_hdmi_encoder_disable() does.
- */
- HDMI_WRITE(VC4_HDMI_TX_PHY_RESET_CTL, 0xf << 16);
- }
+ pm_runtime_enable(dev);
drm_encoder_init(drm, hdmi->encoder, &vc4_hdmi_encoder_funcs,
DRM_MODE_ENCODER_TMDS, NULL);
@@ -724,10 +737,7 @@ static int vc4_hdmi_bind(struct device *dev, struct device *master, void *data)
err_destroy_encoder:
vc4_hdmi_encoder_destroy(hdmi->encoder);
-err_unprepare_hsm:
- clk_disable_unprepare(hdmi->hsm_clock);
-err_unprepare_pix:
- clk_disable_unprepare(hdmi->pixel_clock);
+ pm_runtime_disable(dev);
err_put_i2c:
put_device(&hdmi->ddc->dev);
@@ -744,8 +754,8 @@ static void vc4_hdmi_unbind(struct device *dev, struct device *master,
vc4_hdmi_connector_destroy(hdmi->connector);
vc4_hdmi_encoder_destroy(hdmi->encoder);
- clk_disable_unprepare(hdmi->pixel_clock);
- clk_disable_unprepare(hdmi->hsm_clock);
+ pm_runtime_disable(dev);
+
put_device(&hdmi->ddc->dev);
vc4->hdmi = NULL;
--
2.7.4
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