On Tue, Nov 03, 2020 at 08:58:23PM +0530, Uma Shankar wrote:
> LSPCON firmware exposes HDR capability through LPCON_CAPABILITIES
> DPCD register. LSPCON implementations capable of supporting
> HDR set HDR_CAPABILITY bit in LSPCON_CAPABILITIES to 1. This patch
> reads the same, detects the HDR capability and adds this to
> intel_lspcon struct.
>
> v2: Addressed Jani Nikula's review comment and fixed the HDR
> capability detection logic
>
> v3: Deferred HDR detection from lspcon_init (Ville)
>
> Signed-off-by: Uma Shankar <uma.shankar@xxxxxxxxx>
> ---
> .../drm/i915/display/intel_display_types.h | 1 +
> drivers/gpu/drm/i915/display/intel_lspcon.c | 28 +++++++++++++++++++
> drivers/gpu/drm/i915/display/intel_lspcon.h | 1 +
> 3 files changed, 30 insertions(+)
>
> diff --git a/drivers/gpu/drm/i915/display/intel_display_types.h b/drivers/gpu/drm/i915/display/intel_display_types.h
> index f6f0626649e0..25b2db337174 100644
> --- a/drivers/gpu/drm/i915/display/intel_display_types.h
> +++ b/drivers/gpu/drm/i915/display/intel_display_types.h
> @@ -1417,6 +1417,7 @@ struct intel_lspcon {
> bool active;
> enum drm_lspcon_mode mode;
> enum lspcon_vendor vendor;
> + bool hdr_supported;
Can be packed next to the other bool.
> };
>
> struct intel_digital_port {
> diff --git a/drivers/gpu/drm/i915/display/intel_lspcon.c b/drivers/gpu/drm/i915/display/intel_lspcon.c
> index e37d45e531df..076b21885a30 100644
> --- a/drivers/gpu/drm/i915/display/intel_lspcon.c
> +++ b/drivers/gpu/drm/i915/display/intel_lspcon.c
> @@ -35,6 +35,8 @@
> #define LSPCON_VENDOR_PARADE_OUI 0x001CF8
> #define LSPCON_VENDOR_MCA_OUI 0x0060AD
>
> +#define DPCD_MCA_LSPCON_HDR_STATUS 0x70003
> +
> /* AUX addresses to write MCA AVI IF */
> #define LSPCON_MCA_AVI_IF_WRITE_OFFSET 0x5C0
> #define LSPCON_MCA_AVI_IF_CTRL 0x5DF
> @@ -104,6 +106,32 @@ static bool lspcon_detect_vendor(struct intel_lspcon *lspcon)
> return true;
> }
>
> +void lspcon_detect_hdr_capability(struct intel_lspcon *lspcon)
> +{
> + struct intel_digital_port *dig_port =
> + container_of(lspcon, struct intel_digital_port, lspcon);
> + struct drm_device *dev = dig_port->base.base.dev;
> + struct intel_dp *dp = lspcon_to_intel_dp(lspcon);
> + u8 hdr_caps;
> + int ret;
> +
> + /* Enable HDR for MCA based LSPCON devices */
> + if (lspcon->vendor == LSPCON_VENDOR_MCA)
> + ret = drm_dp_dpcd_read(&dp->aux, DPCD_MCA_LSPCON_HDR_STATUS,
> + &hdr_caps, 1);
> + else
> + return;
> +
> + if (ret < 0) {
> + drm_dbg_kms(dev, "hdr capability detection failed\n");
"hdr" vs. "HDR" elsewhere.
> + lspcon->hdr_supported = false;
> + return;
Pointless return?
> + } else if (hdr_caps & 0x1) {
> + drm_dbg_kms(dev, "lspcon capable of HDR\n");
"lspcon" vs. "LSPCON"
No idea about the magic dpcd reg, but otherwise seems sane enough.
Reviewed-by: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
> + lspcon->hdr_supported = true;
> + }
> +}
> +
> static enum drm_lspcon_mode lspcon_get_current_mode(struct intel_lspcon *lspcon)
> {
> enum drm_lspcon_mode current_mode;
> diff --git a/drivers/gpu/drm/i915/display/intel_lspcon.h b/drivers/gpu/drm/i915/display/intel_lspcon.h
> index b03dcb7076d8..a19b3564c635 100644
> --- a/drivers/gpu/drm/i915/display/intel_lspcon.h
> +++ b/drivers/gpu/drm/i915/display/intel_lspcon.h
> @@ -15,6 +15,7 @@ struct intel_digital_port;
> struct intel_encoder;
> struct intel_lspcon;
>
> +void lspcon_detect_hdr_capability(struct intel_lspcon *lspcon);
> void lspcon_resume(struct intel_digital_port *dig_port);
> void lspcon_wait_pcon_mode(struct intel_lspcon *lspcon);
> void lspcon_write_infoframe(struct intel_encoder *encoder,
> --
> 2.26.2
--
Ville Syrjälä
Intel
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