On Thu, 15 Dec 2016, Madhav Chauhan <madhav.chau...@intel.com> wrote:
> From: Deepak M <m.dee...@intel.com>
>
> v2: Addressed Jani's Review comments(renamed bit field macros)
>
> Signed-off-by: Deepak M <m.dee...@intel.com>
> Signed-off-by: Madhav Chauhan <madhav.chau...@intel.com>
> ---
> drivers/gpu/drm/i915/intel_dsi.c | 134
> +++++++++++++++++++++++++++++++++++++++
> 1 file changed, 134 insertions(+)
>
> diff --git a/drivers/gpu/drm/i915/intel_dsi.c
> b/drivers/gpu/drm/i915/intel_dsi.c
> index b78c686..c0697e9 100644
> --- a/drivers/gpu/drm/i915/intel_dsi.c
> +++ b/drivers/gpu/drm/i915/intel_dsi.c
> @@ -357,6 +357,134 @@ static bool intel_dsi_compute_config(struct
> intel_encoder *encoder,
> return true;
> }
>
> +static void intel_dsi_disable_mipiio(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 intel_dsi_enable_mipiio(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;
> +
> + /* 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);
> + }
> +
> + /* Set the MIPI mode */
> + for_each_dsi_port(port, intel_dsi->ports) {
> + tmp = I915_READ(MIPI_CTRL(port));
> + I915_WRITE(MIPI_CTRL(port), tmp | GLK_MIPIIO_ENABLE);
> + }
> +
> + /* 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");
> + }
> +}
> +
I'm wondering if these should just be GLK versions of
intel_dsi_device_ready and intel_dsi_clear_device_ready. It seems
totally wrong that you're doing device ready stuff twice on GLK...
> static void bxt_dsi_device_ready(struct intel_encoder *encoder)
> {
> struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
> @@ -559,6 +687,9 @@ static void intel_dsi_pre_enable(struct intel_encoder
> *encoder,
>
> intel_dsi_prepare(encoder, pipe_config);
>
> + if (IS_GEMINILAKE(dev_priv))
> + intel_dsi_enable_mipiio(encoder);
> +
> /* Panel Enable over CRC PMIC */
> if (intel_dsi->gpio_panel)
> gpiod_set_value_cansleep(intel_dsi->gpio_panel, 1);
> @@ -699,6 +830,9 @@ static void intel_dsi_clear_device_ready(struct
> intel_encoder *encoder)
> usleep_range(2000, 2500);
> }
>
> + if (IS_GEMINILAKE(dev_priv))
> + intel_dsi_disable_mipiio(encoder);
> +
When you're doing enable/disable of something, they should be called
from the corresponding functions in the enable/disable paths. But this
is just a general remark, if we conclude that these should be
alternative device ready/unready calls instead.
BR,
Jani.
> intel_disable_dsi_pll(encoder);
> }
--
Jani Nikula, Intel Open Source Technology Center
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