[Intel-gfx] [GLK MIPI DSI V5 3/8] drm/i915/glk: Add MIPIIO Enable/disable sequence
Jani Nikula
jani.nikula at intel.com
Thu Feb 16 15:07:53 UTC 2017
On Tue, 14 Feb 2017, Madhav Chauhan <madhav.chauhan at intel.com> wrote:
> From: Deepak M <m.deepak at intel.com>
>
> v2: Addressed Jani's Review comments(renamed bit field macros)
> v3: Jani's Review comment for aligning code to platforms and added
> wrapper functions.
> v4: Corrected enable/disable seuqence as per BSPEC
>
> Signed-off-by: Deepak M <m.deepak at intel.com>
> Signed-off-by: Madhav Chauhan <madhav.chauhan at intel.com>
> ---
> drivers/gpu/drm/i915/intel_dsi.c | 206 ++++++++++++++++++++++++++++++++++++---
> 1 file changed, 195 insertions(+), 11 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/intel_dsi.c b/drivers/gpu/drm/i915/intel_dsi.c
> index 03d0999..a72a10f 100644
> --- a/drivers/gpu/drm/i915/intel_dsi.c
> +++ b/drivers/gpu/drm/i915/intel_dsi.c
> @@ -357,6 +357,109 @@ static bool intel_dsi_compute_config(struct intel_encoder *encoder,
> return true;
> }
>
> +static void glk_dsi_device_ready(struct intel_encoder *encoder)
> +{
> + struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
> + struct intel_dsi *intel_dsi = enc_to_intel_dsi(&encoder->base);
> + enum port port;
> + u32 tmp, val;
> +
> + /* Set the MIPI mode
> + * If MIPI_Mode is off, then writing to LP_Wake bit is not reflecting.
> + * Power ON MIPI IO first and then write into IO reset and LP wake bits
> + */
> + for_each_dsi_port(port, intel_dsi->ports) {
> + tmp = I915_READ(MIPI_CTRL(port));
> + I915_WRITE(MIPI_CTRL(port), tmp | GLK_MIPIIO_ENABLE);
> + }
> +
> + /* Put the IO into reset */
> + tmp = I915_READ(MIPI_CTRL(PORT_A));
> + tmp &= ~GLK_MIPIIO_RESET_RELEASED;
> + I915_WRITE(MIPI_CTRL(PORT_A), tmp);
> +
> + /* Program LP Wake */
> + for_each_dsi_port(port, intel_dsi->ports) {
> + tmp = I915_READ(MIPI_CTRL(port));
> + tmp |= GLK_LP_WAKE;
> + I915_WRITE(MIPI_CTRL(port), tmp);
> + }
> +
> + /* Wait for Pwr ACK */
> + for_each_dsi_port(port, intel_dsi->ports) {
> + if (intel_wait_for_register(dev_priv,
> + MIPI_CTRL(port), GLK_MIPIIO_PORT_POWERED,
> + GLK_MIPIIO_PORT_POWERED, 20))
> + DRM_ERROR("Power ACK not received\n");
> + }
> +
> + /* Wait for MIPI PHY status bit to set */
> + for_each_dsi_port(port, intel_dsi->ports) {
> + if (intel_wait_for_register(dev_priv,
> + MIPI_CTRL(port), GLK_MIPIIO_PORT_POWERED,
> + GLK_MIPIIO_PORT_POWERED, 20))
> + DRM_ERROR("PHY is not ON\n");
> + }
You have the same wait twice here, with different comments and error
messages.
> +
> + /* Get IO out of reset */
> + tmp = I915_READ(MIPI_CTRL(PORT_A));
> + I915_WRITE(MIPI_CTRL(PORT_A), tmp | GLK_MIPIIO_RESET_RELEASED);
> +
> + /* Get IO out of Low power state*/
> + for_each_dsi_port(port, intel_dsi->ports) {
> + if (!(I915_READ(MIPI_DEVICE_READY(port)) & DEVICE_READY)) {
> + val = I915_READ(MIPI_DEVICE_READY(port));
> + val &= ~ULPS_STATE_MASK;
> + val |= DEVICE_READY;
> + I915_WRITE(MIPI_DEVICE_READY(port), val);
> + usleep_range(10, 15);
> + }
> +
> + /* Enter ULPS */
> + val = I915_READ(MIPI_DEVICE_READY(port));
> + val &= ~ULPS_STATE_MASK;
> + val |= (ULPS_STATE_ENTER | DEVICE_READY);
> + I915_WRITE(MIPI_DEVICE_READY(port), val);
> +
> + /* Wait for ULPS Not active */
> + if (intel_wait_for_register(dev_priv,
> + MIPI_CTRL(port), GLK_ULPS_NOT_ACTIVE,
> + GLK_ULPS_NOT_ACTIVE, 20))
> +
> + /* Exit ULPS */
> + val = I915_READ(MIPI_DEVICE_READY(port));
> + val &= ~ULPS_STATE_MASK;
> + val |= (ULPS_STATE_EXIT | DEVICE_READY);
> + I915_WRITE(MIPI_DEVICE_READY(port), val);
> +
> + /* Enter Normal Mode */
> + val = I915_READ(MIPI_DEVICE_READY(port));
> + val &= ~ULPS_STATE_MASK;
> + val |= (ULPS_STATE_NORMAL_OPERATION | DEVICE_READY);
> + I915_WRITE(MIPI_DEVICE_READY(port), val);
> +
> + tmp = I915_READ(MIPI_CTRL(port));
> + tmp &= ~GLK_LP_WAKE;
> + I915_WRITE(MIPI_CTRL(port), tmp);
> + }
> +
> + /* Wait for Stop state */
> + for_each_dsi_port(port, intel_dsi->ports) {
> + if (intel_wait_for_register(dev_priv,
> + MIPI_CTRL(port), GLK_DATA_LANE_STOP_STATE,
> + GLK_DATA_LANE_STOP_STATE, 20))
> + DRM_ERROR("Date lane not in STOP state\n");
> + }
> +
> + /* Wait for AFE LATCH */
> + for_each_dsi_port(port, intel_dsi->ports) {
> + if (intel_wait_for_register(dev_priv,
> + BXT_MIPI_PORT_CTRL(port), AFE_LATCHOUT,
> + AFE_LATCHOUT, 20))
> + DRM_ERROR("D-PHY not entering LP-11 state\n");
> + }
> +}
> +
> static void bxt_dsi_device_ready(struct intel_encoder *encoder)
> {
> struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
> @@ -442,8 +545,10 @@ static void intel_dsi_device_ready(struct intel_encoder *encoder)
>
> if (IS_VALLEYVIEW(dev_priv) || IS_CHERRYVIEW(dev_priv))
> vlv_dsi_device_ready(encoder);
> - else if (IS_GEN9_LP(dev_priv))
> + else if (IS_BROXTON(dev_priv))
> bxt_dsi_device_ready(encoder);
> + else if (IS_GEMINILAKE(dev_priv))
> + glk_dsi_device_ready(encoder);
> }
>
> static void intel_dsi_port_enable(struct intel_encoder *encoder)
> @@ -649,18 +754,20 @@ static void intel_dsi_disable(struct intel_encoder *encoder)
> msleep(2);
> }
>
> - for_each_dsi_port(port, intel_dsi->ports) {
> - /* Panel commands can be sent when clock is in LP11 */
> - I915_WRITE(MIPI_DEVICE_READY(port), 0x0);
> + if (!IS_GEMINILAKE(dev_priv)) {
> + for_each_dsi_port(port, intel_dsi->ports) {
> + /* Panel commands can be sent when clock is in LP11 */
> + I915_WRITE(MIPI_DEVICE_READY(port), 0x0);
>
> - intel_dsi_reset_clocks(encoder, port);
> - I915_WRITE(MIPI_EOT_DISABLE(port), CLOCKSTOP);
> + intel_dsi_reset_clocks(encoder, port);
> + I915_WRITE(MIPI_EOT_DISABLE(port), CLOCKSTOP);
>
> - temp = I915_READ(MIPI_DSI_FUNC_PRG(port));
> - temp &= ~VID_MODE_FORMAT_MASK;
> - I915_WRITE(MIPI_DSI_FUNC_PRG(port), temp);
> + temp = I915_READ(MIPI_DSI_FUNC_PRG(port));
> + temp &= ~VID_MODE_FORMAT_MASK;
> + I915_WRITE(MIPI_DSI_FUNC_PRG(port), temp);
>
> - I915_WRITE(MIPI_DEVICE_READY(port), 0x1);
> + I915_WRITE(MIPI_DEVICE_READY(port), 0x1);
> + }
> }
> /* if disable packets are sent before sending shutdown packet then in
> * some next enable sequence send turn on packet error is observed */
> @@ -670,7 +777,73 @@ static void intel_dsi_disable(struct intel_encoder *encoder)
> wait_for_dsi_fifo_empty(intel_dsi, port);
> }
>
> -static void intel_dsi_clear_device_ready(struct intel_encoder *encoder)
> +static void glk_dsi_enter_low_power_mode(struct intel_encoder *encoder)
> +{
> + struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
> + struct intel_dsi *intel_dsi = enc_to_intel_dsi(&encoder->base);
> + enum port port;
> + u32 val;
> +
> + /* Enter ULPS */
> + for_each_dsi_port(port, intel_dsi->ports) {
> + val = I915_READ(MIPI_DEVICE_READY(port));
> + val &= ~ULPS_STATE_MASK;
> + val |= (ULPS_STATE_ENTER | DEVICE_READY);
> + I915_WRITE(MIPI_DEVICE_READY(port), val);
> + }
> +
> + /* Wait for MIPI PHY status bit to unset */
> + for_each_dsi_port(port, intel_dsi->ports) {
> + if (intel_wait_for_register(dev_priv,
> + MIPI_CTRL(port),
> + GLK_PHY_STATUS_PORT_READY, 0, 20))
> + DRM_ERROR("PHY is not turning OFF\n");
> + }
> +
> + /* Wait for Pwr ACK bit to unset */
> + for_each_dsi_port(port, intel_dsi->ports) {
> + if (intel_wait_for_register(dev_priv,
> + MIPI_CTRL(port),
> + GLK_MIPIIO_PORT_POWERED, 0, 20))
> + DRM_ERROR("MIPI IO Port is not powergated\n");
> + }
> +}
> +
> +static void glk_dsi_disable_mipi_io(struct intel_encoder *encoder)
> +{
> + struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
> + struct intel_dsi *intel_dsi = enc_to_intel_dsi(&encoder->base);
> + enum port port;
> + u32 tmp;
> +
> + /* Put the IO into reset */
> + tmp = I915_READ(MIPI_CTRL(PORT_A));
> + tmp &= ~GLK_MIPIIO_RESET_RELEASED;
> + I915_WRITE(MIPI_CTRL(PORT_A), tmp);
> +
> + /* Wait for MIPI PHY status bit to unset */
> + for_each_dsi_port(port, intel_dsi->ports) {
> + if (intel_wait_for_register(dev_priv,
> + MIPI_CTRL(port),
> + GLK_PHY_STATUS_PORT_READY, 0, 20))
> + DRM_ERROR("PHY is not turning OFF\n");
> + }
> +
> + /* Clear MIPI mode */
> + for_each_dsi_port(port, intel_dsi->ports) {
> + tmp = I915_READ(MIPI_CTRL(port));
> + tmp &= ~GLK_MIPIIO_ENABLE;
> + I915_WRITE(MIPI_CTRL(port), tmp);
> + }
> +}
> +
> +static void glk_dsi_clear_device_ready(struct intel_encoder *encoder)
> +{
> + glk_dsi_enter_low_power_mode(encoder);
> + glk_dsi_disable_mipi_io(encoder);
> +}
> +
> +static void vlv_dsi_clear_device_ready(struct intel_encoder *encoder)
> {
> struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
> struct intel_dsi *intel_dsi = enc_to_intel_dsi(&encoder->base);
> @@ -713,6 +886,17 @@ static void intel_dsi_clear_device_ready(struct intel_encoder *encoder)
> }
> }
>
> +static void intel_dsi_clear_device_ready(struct intel_encoder *encoder)
> +{
> + struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
> +
> + if (IS_VALLEYVIEW(dev_priv) || IS_CHERRYVIEW(dev_priv) ||
> + IS_BROXTON(dev_priv))
> + vlv_dsi_clear_device_ready(encoder);
> + else if (IS_GEMINILAKE(dev_priv))
> + glk_dsi_clear_device_ready(encoder);
> +}
> +
> static void intel_dsi_post_disable(struct intel_encoder *encoder,
> struct intel_crtc_state *pipe_config,
> struct drm_connector_state *conn_state)
--
Jani Nikula, Intel Open Source Technology Center
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