On Sun, 07 Dec 2014, Gaurav K Singh <gaurav.k.singh@xxxxxxxxx> wrote:
> Due to some hardware limitations, MIPI Port C DPI Enable bit
> does not get set. To check whether DSI Port C was enabled in BIOS,
> check the Pipe B enable bit for DSI Port C. In hardware, DSI Port C
> is linked with Pipe B.
"due to some hardware limitations" is awfully vague. The same code will
be used on many platforms; I doubt this applies to all of them. Is there
a workaround name for this?
BR,
Jani.
>
> Signed-off-by: Gaurav K Singh <gaurav.k.singh@xxxxxxxxx>
> ---
> drivers/gpu/drm/i915/intel_dsi.c | 21 ++++++++++++++++-----
> 1 file changed, 16 insertions(+), 5 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/intel_dsi.c b/drivers/gpu/drm/i915/intel_dsi.c
> index 215d004..0334c4d 100644
> --- a/drivers/gpu/drm/i915/intel_dsi.c
> +++ b/drivers/gpu/drm/i915/intel_dsi.c
> @@ -398,8 +398,9 @@ static bool intel_dsi_get_hw_state(struct intel_encoder *encoder,
> enum pipe *pipe)
> {
> struct drm_i915_private *dev_priv = encoder->base.dev->dev_private;
> + struct intel_dsi *intel_dsi = enc_to_intel_dsi(&encoder->base);
> enum intel_display_power_domain power_domain;
> - u32 port_ctl, func;
> + u32 dsi_status, func;
> enum port port;
>
> DRM_DEBUG_KMS("\n");
> @@ -409,13 +410,23 @@ static bool intel_dsi_get_hw_state(struct intel_encoder *encoder,
> return false;
>
> /* XXX: this only works for one DSI output */
> - for_each_dsi_port(port, (1 << PORT_A) | (1 << PORT_C)) {
> - port_ctl = I915_READ(MIPI_PORT_CTRL(port));
> + for_each_dsi_port(port, intel_dsi->ports) {
> func = I915_READ(MIPI_DSI_FUNC_PRG(port));
>
> - if ((port_ctl & DPI_ENABLE) || (func & CMD_MODE_DATA_WIDTH_MASK)) {
> + /* Due to some hardware limitations, MIPI Port C DPI Enable
> + * bit does not get set. To check whether DSI Port C was
> + * enabled in BIOS, check the Pipe B enable bit
> + */
> + if (port == PORT_C)
> + dsi_status = I915_READ(PIPECONF(PIPE_B)) &
> + PIPECONF_ENABLE;
> + else
> + dsi_status = I915_READ(MIPI_PORT_CTRL(port)) &
> + DPI_ENABLE;
> +
> + if (dsi_status || (func & CMD_MODE_DATA_WIDTH_MASK)) {
> if (I915_READ(MIPI_DEVICE_READY(port)) & DEVICE_READY) {
> - *pipe = port == PORT_A ? PIPE_A : PIPE_C;
> + *pipe = port == PORT_A ? PIPE_A : PIPE_B;
> return true;
> }
> }
> --
> 1.7.9.5
>
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> Intel-gfx@xxxxxxxxxxxxxxxxxxxxx
> http://lists.freedesktop.org/mailman/listinfo/intel-gfx
--
Jani Nikula, Intel Open Source Technology Center
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