> -----Original Message-----
> From: Nikula, Jani
> Sent: Wednesday, February 8, 2017 8:29 PM
> To: Chauhan, Madhav <madhav.chauhan@xxxxxxxxx>; intel-
> gfx@xxxxxxxxxxxxxxxxxxxxx
> Cc: Shankar, Uma <uma.shankar@xxxxxxxxx>; Mukherjee, Indranil
> <indranil.mukherjee@xxxxxxxxx>; Kamath, Sunil <sunil.kamath@xxxxxxxxx>;
> Saarinen, Jani <jani.saarinen@xxxxxxxxx>; Conselvan De Oliveira, Ander
> <ander.conselvan.de.oliveira@xxxxxxxxx>; Deepak M
> <m.deepak@xxxxxxxxx>; Chauhan, Madhav <madhav.chauhan@xxxxxxxxx>
> Subject: Re: [GLK MIPI DSI V4 3/8] drm/i915/glk: Add MIPIIO Enable/disable
> sequence
>
> On Tue, 07 Feb 2017, Madhav Chauhan <madhav.chauhan@xxxxxxxxx>
> wrote:
> > From: Deepak M <m.deepak@xxxxxxxxx>
> >
> > 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@xxxxxxxxx>
> > Signed-off-by: Madhav Chauhan <madhav.chauhan@xxxxxxxxx>
> > ---
> > 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 be81283..0def214 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);
> > +
>
> Since you've split glk_dsi_clear_device_ready into two functions, it would
> stand to reason to also split this one accordingly.
glk_dsi_clear_device_ready includes two steps: 7 and 8 of disable sequence mentioned in bspec that's why splitted.
While glk_dsi_device_ready is *ONLY* doing step 4 (enable IO).
>
> BR,
> Jani.
>
> > + /* 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");
> > + }
> > +
> > + /* 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) @@
> > -637,18 +742,20 @@ 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
> > */ @@ -658,7 +765,73 @@ 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); @@
> > -701,6 +874,17 @@ 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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