From: Hans Verkuil <hverkuil@xs4all.nl> To: linux-media@vger.kernel.org Cc: Eric Anholt <eric@anholt.net>, dri-devel@lists.freedesktop.org, Hans Verkuil <hans.verkuil@cisco.com> Subject: [PATCH 2/4] drm/vc4: prepare for CEC support Date: Tue, 11 Jul 2017 13:20:19 +0200 [thread overview] Message-ID: <20170711112021.38525-3-hverkuil@xs4all.nl> (raw) In-Reply-To: <20170711112021.38525-1-hverkuil@xs4all.nl> From: Hans Verkuil <hans.verkuil@cisco.com> In order to support CEC the hsm clock needs to be enabled in vc4_hdmi_bind(), not in vc4_hdmi_encoder_enable(). Otherwise you wouldn't be able to support CEC when there is no hotplug detect signal, which is required by some monitors that turn off the HPD when in standby, but keep the CEC bus alive so they can be woken up. The HDMI core also has to be enabled in vc4_hdmi_bind() for the same reason. Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com> --- drivers/gpu/drm/vc4/vc4_hdmi.c | 59 +++++++++++++++++++++--------------------- 1 file changed, 29 insertions(+), 30 deletions(-) diff --git a/drivers/gpu/drm/vc4/vc4_hdmi.c b/drivers/gpu/drm/vc4/vc4_hdmi.c index ed63d4e85762..e0104f96011e 100644 --- a/drivers/gpu/drm/vc4/vc4_hdmi.c +++ b/drivers/gpu/drm/vc4/vc4_hdmi.c @@ -463,11 +463,6 @@ static void vc4_hdmi_encoder_disable(struct drm_encoder *encoder) 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); @@ -509,16 +504,6 @@ static void vc4_hdmi_encoder_enable(struct drm_encoder *encoder) 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)); @@ -533,20 +518,6 @@ static void vc4_hdmi_encoder_enable(struct drm_encoder *encoder) 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); @@ -1205,6 +1176,23 @@ static int vc4_hdmi_bind(struct device *dev, struct device *master, void *data) return -EPROBE_DEFER; } + /* 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_put_i2c; + } + + ret = clk_prepare_enable(hdmi->hsm_clock); + if (ret) { + DRM_ERROR("Failed to turn on HDMI state machine clock: %d\n", + ret); + goto err_put_i2c; + } + /* Only use the GPIO HPD pin if present in the DT, otherwise * we'll use the HDMI core's register. */ @@ -1216,7 +1204,7 @@ 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_put_i2c; + goto err_unprepare_hsm; } hdmi->hpd_active_low = hpd_gpio_flags & OF_GPIO_ACTIVE_LOW; @@ -1224,6 +1212,14 @@ 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); + } pm_runtime_enable(dev); drm_encoder_init(drm, hdmi->encoder, &vc4_hdmi_encoder_funcs, @@ -1244,6 +1240,8 @@ 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); pm_runtime_disable(dev); err_put_i2c: put_device(&hdmi->ddc->dev); @@ -1263,6 +1261,7 @@ 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->hsm_clock); pm_runtime_disable(dev); put_device(&hdmi->ddc->dev); -- 2.11.0
WARNING: multiple messages have this Message-ID (diff)
From: Hans Verkuil <hverkuil@xs4all.nl> To: linux-media@vger.kernel.org Cc: Hans Verkuil <hans.verkuil@cisco.com>, dri-devel@lists.freedesktop.org Subject: [PATCH 2/4] drm/vc4: prepare for CEC support Date: Tue, 11 Jul 2017 13:20:19 +0200 [thread overview] Message-ID: <20170711112021.38525-3-hverkuil@xs4all.nl> (raw) In-Reply-To: <20170711112021.38525-1-hverkuil@xs4all.nl> From: Hans Verkuil <hans.verkuil@cisco.com> In order to support CEC the hsm clock needs to be enabled in vc4_hdmi_bind(), not in vc4_hdmi_encoder_enable(). Otherwise you wouldn't be able to support CEC when there is no hotplug detect signal, which is required by some monitors that turn off the HPD when in standby, but keep the CEC bus alive so they can be woken up. The HDMI core also has to be enabled in vc4_hdmi_bind() for the same reason. Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com> --- drivers/gpu/drm/vc4/vc4_hdmi.c | 59 +++++++++++++++++++++--------------------- 1 file changed, 29 insertions(+), 30 deletions(-) diff --git a/drivers/gpu/drm/vc4/vc4_hdmi.c b/drivers/gpu/drm/vc4/vc4_hdmi.c index ed63d4e85762..e0104f96011e 100644 --- a/drivers/gpu/drm/vc4/vc4_hdmi.c +++ b/drivers/gpu/drm/vc4/vc4_hdmi.c @@ -463,11 +463,6 @@ static void vc4_hdmi_encoder_disable(struct drm_encoder *encoder) 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); @@ -509,16 +504,6 @@ static void vc4_hdmi_encoder_enable(struct drm_encoder *encoder) 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)); @@ -533,20 +518,6 @@ static void vc4_hdmi_encoder_enable(struct drm_encoder *encoder) 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); @@ -1205,6 +1176,23 @@ static int vc4_hdmi_bind(struct device *dev, struct device *master, void *data) return -EPROBE_DEFER; } + /* 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_put_i2c; + } + + ret = clk_prepare_enable(hdmi->hsm_clock); + if (ret) { + DRM_ERROR("Failed to turn on HDMI state machine clock: %d\n", + ret); + goto err_put_i2c; + } + /* Only use the GPIO HPD pin if present in the DT, otherwise * we'll use the HDMI core's register. */ @@ -1216,7 +1204,7 @@ 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_put_i2c; + goto err_unprepare_hsm; } hdmi->hpd_active_low = hpd_gpio_flags & OF_GPIO_ACTIVE_LOW; @@ -1224,6 +1212,14 @@ 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); + } pm_runtime_enable(dev); drm_encoder_init(drm, hdmi->encoder, &vc4_hdmi_encoder_funcs, @@ -1244,6 +1240,8 @@ 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); pm_runtime_disable(dev); err_put_i2c: put_device(&hdmi->ddc->dev); @@ -1263,6 +1261,7 @@ 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->hsm_clock); pm_runtime_disable(dev); put_device(&hdmi->ddc->dev); -- 2.11.0 _______________________________________________ dri-devel mailing list dri-devel@lists.freedesktop.org https://lists.freedesktop.org/mailman/listinfo/dri-devel
next prev parent reply other threads:[~2017-07-11 11:20 UTC|newest] Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top 2017-07-11 11:20 [PATCH 0/4] drm/vc4: add HDMI CEC support Hans Verkuil 2017-07-11 11:20 ` [PATCH 1/4] cec: be smarter about detecting the number of attempts made Hans Verkuil 2017-07-11 11:20 ` Hans Verkuil [this message] 2017-07-11 11:20 ` [PATCH 2/4] drm/vc4: prepare for CEC support Hans Verkuil 2017-07-12 18:42 ` Eric Anholt 2017-07-12 18:42 ` Eric Anholt 2017-07-12 19:30 ` Hans Verkuil 2017-07-11 11:20 ` [PATCH 3/4] drm/vc4: Add register defines for CEC Hans Verkuil 2017-07-12 18:33 ` Eric Anholt 2017-07-11 11:20 ` [PATCH 4/4] drm/vc4: add HDMI CEC support Hans Verkuil 2017-07-12 19:02 ` Eric Anholt 2017-07-12 19:43 ` Hans Verkuil 2017-07-16 10:46 ` Hans Verkuil 2017-07-16 10:46 ` Hans Verkuil 2017-07-18 22:03 ` Eric Anholt
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