On Mon, Jul 10, 2017 at 04:48:48PM +0530, Shashank Sharma wrote:
> LSPCON chips can't pick the HDMI AVI infoframes from direct link.
> In order to pass AVI infoframes from display controller to LSPCON,
> we have to write infoframe packets into vendor specified AUX address.
>
> Also, LSPCON vendors provide AUX offsets, to inform the LSPCON
> chip that the AVI IF packets are written, so that the firmware
> can pick it up and apply.
>
> This patch adds function to write AVI infoframes for both MCA as
> well as Parade Tech LSPCON chips. These two vendors provide different
> methods for writing infoframes, so this patch contains two different
> functions, one for each.
Seems to me that we should also be checking the receiver cap for the
444->420 conversion support, and enable it in the PROTOCOL_CONVERTER
DPCD register. Or are these LSPCON things even ignoring that part of the
spec?
>
> Cc: Ville Syrjälä <ville.syrj...@linux.intel.com>
> Cc: Imre Deak <imre.d...@intel.com>
> Signed-off-by: Shashank Sharma <shashank.sha...@intel.com>
> ---
> drivers/gpu/drm/i915/intel_ddi.c | 8 ++
> drivers/gpu/drm/i915/intel_drv.h | 3 +
> drivers/gpu/drm/i915/intel_lspcon.c | 174
> ++++++++++++++++++++++++++++++++++++
> 3 files changed, 185 insertions(+)
>
> diff --git a/drivers/gpu/drm/i915/intel_ddi.c
> b/drivers/gpu/drm/i915/intel_ddi.c
> index f691710..944d9d5 100644
> --- a/drivers/gpu/drm/i915/intel_ddi.c
> +++ b/drivers/gpu/drm/i915/intel_ddi.c
> @@ -2068,6 +2068,14 @@ void intel_ddi_set_avi_infoframe(struct drm_encoder
> *encoder,
> rgb_qrange_limited,
> rgb_qrange_selectable);
>
> + if (crtc_state->lspcon_active) {
> + struct intel_lspcon *lspcon = enc_to_intel_lspcon(encoder);
> +
> + /* LSPCON writes infoframes via AUX */
> + lspcon->write_infoframe(encoder, crtc_state, &frame);
> + return;
> + }
> +
> intel_write_infoframe(encoder, crtc_state, &frame);
> }
>
> diff --git a/drivers/gpu/drm/i915/intel_drv.h
> b/drivers/gpu/drm/i915/intel_drv.h
> index fad9a53..3e686d2 100644
> --- a/drivers/gpu/drm/i915/intel_drv.h
> +++ b/drivers/gpu/drm/i915/intel_drv.h
> @@ -1079,6 +1079,9 @@ struct intel_lspcon {
> /* AVI IF setup function for LSPCON */
> void (*set_infoframes)(struct drm_encoder *encoder,
> const struct intel_crtc_state *crtc_state);
> + void (*write_infoframe)(struct drm_encoder *encoder,
> + const struct intel_crtc_state *crtc_state,
> + union hdmi_infoframe *frame);
> };
>
> struct intel_digital_port {
> diff --git a/drivers/gpu/drm/i915/intel_lspcon.c
> b/drivers/gpu/drm/i915/intel_lspcon.c
> index 53ddd39..01fddf7 100644
> --- a/drivers/gpu/drm/i915/intel_lspcon.c
> +++ b/drivers/gpu/drm/i915/intel_lspcon.c
> @@ -31,6 +31,18 @@
> #define LSPCON_VENDOR_PARADE_OUI 0x001CF8
> #define LSPCON_VENDOR_MCA_OUI 0x0060AD
>
> +/* AUX addresses to write AVI IF into */
> +#define LSPCON_MCA_AVI_IF_WRITE_OFFSET 0x5C0
> +#define LSPCON_MCA_AVI_IF_CTRL 0x5DF
> +#define LSPCON_MCA_AVI_IF_KICKOFF (1 << 0)
> +#define LSPCON_MCA_AVI_IF_HANDLED (1 << 1)
> +
> +#define LSPCON_PARADE_AVI_IF_WRITE_OFFSET 0x516
> +#define LSPCON_PARADE_AVI_IF_CTRL 0x51E
> +#define LSPCON_PARADE_AVI_IF_KICKOFF (1 << 7)
> +#define LSPCON_PARADE_AVI_IF_STATUS 0x51F
> +#define LSPCON_PARADE_AVI_IF_HANDLED (2 << 6)
> +
> static struct intel_dp *lspcon_to_intel_dp(struct intel_lspcon *lspcon)
> {
> struct intel_digital_port *dig_port =
> @@ -217,6 +229,167 @@ bool lspcon_ycbcr420_config(struct drm_connector
> *connector,
> return false;
> }
>
> +static bool _lspcon_write_infoframe_parade(struct drm_dp_aux *aux,
> + uint8_t *buffer, ssize_t len)
> +{
> + u8 avi_if_ctrl;
> + u8 avi_if_status;
> + u8 count = 0;
> + u8 retry = 5;
> + u8 avi_buf[8] = {0, };
> + uint16_t reg;
> + ssize_t ret;
> +
> + while (count++ < 4) {
> +
> + do {
> + /* Is LSPCON FW ready */
> + reg = LSPCON_PARADE_AVI_IF_CTRL;
> + ret = drm_dp_dpcd_read(aux, reg, &avi_if_ctrl, 1);
> + if (ret < 0) {
> + DRM_ERROR("DPCD read failed, add:0x%x\n", reg);
> + return false;
> + }
> +
> + if (avi_if_ctrl & LSPCON_PARADE_AVI_IF_KICKOFF)
> + break;
> + usleep_range(100, 200);
> + } while (--retry);
> +
> + if (!(avi_if_ctrl & LSPCON_PARADE_AVI_IF_KICKOFF)) {
> + DRM_ERROR("LSPCON FW not ready for infoframes\n");
> + return false;
> + }
> +
> + /*
> + * AVI Infoframe contains 31 bytes of data:
> + * HB0 to HB2 (3 bytes header)
> + * PB0 to PB27 (28 bytes data)
> + * As per Parade spec, while sending first block (8bytes),
> + * byte 0 is kept for request token no, and byte1 - byte7
> + * contain frame data. So we have to pack frame like this:
> + * first block of 8 bytes: <token> <HB0-HB2> <PB0-PB3>
> + * next 3 blocks: <PB4-PB27>
> + */
> + if (count)
> + memcpy(avi_buf, buffer + count * 8 - 1, 8);
> + else {
> + avi_buf[0] = 1;
> + memcpy(&avi_buf[1], buffer, 7);
> + }
> +
> + /* Write 8 bytes of data at a time */
> + reg = LSPCON_PARADE_AVI_IF_WRITE_OFFSET;
> + ret = drm_dp_dpcd_write(aux, reg, avi_buf, 8);
> + if (ret < 0) {
> + DRM_ERROR("DPCD write failed, add:0x%x\n", reg);
> + return false;
> + }
> +
> + /*
> + * While sending a block of 8 byes, we need to inform block
> + * number to FW, by programming bits[1:0] of ctrl reg with
> + * block number
> + */
> + avi_if_ctrl = 0x80 + count;
> + reg = LSPCON_PARADE_AVI_IF_CTRL;
> + ret = drm_dp_dpcd_write(aux, reg, &avi_if_ctrl, 1);
> + if (ret < 0) {
> + DRM_ERROR("DPCD write failed, add:0x%x\n", reg);
> + return false;
> + }
> + }
> +
> + /* Check LSPCON FW status */
> + reg = LSPCON_PARADE_AVI_IF_STATUS;
> + ret = drm_dp_dpcd_read(aux, reg, &avi_if_status, 1);
> + if (ret < 0) {
> + DRM_ERROR("DPCD write failed, address 0x%x\n", reg);
> + return false;
> + }
> +
> + if (avi_if_status & LSPCON_PARADE_AVI_IF_HANDLED)
> + DRM_DEBUG_KMS("AVI IF handled by FW\n");
> +
> + return true;
> +}
> +
> +static bool _lspcon_write_infoframe_mca(struct drm_dp_aux *aux,
> + uint8_t *buffer, ssize_t len)
> +{
> + int ret;
> + uint32_t val = 0;
> + uint16_t reg;
> + uint8_t *data = buffer;
> +
> + reg = LSPCON_MCA_AVI_IF_WRITE_OFFSET;
> + while (val < len) {
> + ret = drm_dp_dpcd_write(aux, reg, data, 1);
> + if (ret < 0) {
> + DRM_ERROR("DPCD write failed, add:0x%x\n", reg);
> + return false;
> + }
> + val++; reg++; data++;
> + }
> +
> + val = 0;
> + reg = LSPCON_MCA_AVI_IF_CTRL;
> + ret = drm_dp_dpcd_read(aux, reg, &val, 1);
> + if (ret < 0) {
> + DRM_ERROR("DPCD read failed, address 0x%x\n", reg);
> + return false;
> + }
> +
> + /* Indicate LSPCON chip about infoframe, clear bit 1 and set bit 0 */
> + val &= ~LSPCON_MCA_AVI_IF_HANDLED;
> + val |= LSPCON_MCA_AVI_IF_KICKOFF;
> +
> + ret = drm_dp_dpcd_write(aux, reg, &val, 1);
> + if (ret < 0) {
> + DRM_ERROR("DPCD read failed, address 0x%x\n", reg);
> + return false;
> + }
> +
> + val = 0;
> + ret = drm_dp_dpcd_read(aux, reg, &val, 1);
> + if (ret < 0) {
> + DRM_ERROR("DPCD read failed, address 0x%x\n", reg);
> + return false;
> + }
> +
> + if (val == LSPCON_MCA_AVI_IF_HANDLED)
> + DRM_DEBUG_KMS("AVI IF handled by FW\n");
> +
> + return true;
> +}
> +
> +void lspcon_write_infoframe(struct drm_encoder *encoder,
> + const struct intel_crtc_state *crtc_state,
> + union hdmi_infoframe *frame)
> +{
> + bool ret;
> + ssize_t len;
> + uint8_t buf[VIDEO_DIP_DATA_SIZE];
> + struct intel_dp *intel_dp = enc_to_intel_dp(encoder);
> + struct intel_lspcon *lspcon = enc_to_intel_lspcon(encoder);
> +
> + len = hdmi_infoframe_pack(frame, buf, sizeof(buf));
> + if (len < 0) {
> + DRM_ERROR("Failed to pack AVI IF\n");
> + return;
> + }
> +
> + if (lspcon->vendor == LSPCON_VENDOR_MCA)
> + ret = _lspcon_write_infoframe_mca(&intel_dp->aux, buf, len);
> + else
> + ret = _lspcon_write_infoframe_parade(&intel_dp->aux, buf, len);
> +
> + if (!ret)
> + DRM_ERROR("Failed to write AVI infoframes\n");
> + else
> + DRM_DEBUG_DRIVER("AVI infoframes updated successfully\n");
> +}
> +
> void lspcon_resume(struct intel_lspcon *lspcon)
> {
> enum drm_lspcon_mode expected_mode;
> @@ -282,6 +455,7 @@ bool lspcon_init(struct intel_digital_port
> *intel_dig_port)
>
> connector->ycbcr_420_allowed = true;
> lspcon->set_infoframes = intel_ddi_set_avi_infoframe;
> + lspcon->write_infoframe = lspcon_write_infoframe;
> drm_dp_read_desc(&dp->aux, &dp->desc, drm_dp_is_branch(dp->dpcd));
>
> DRM_DEBUG_KMS("Success: LSPCON init\n");
> --
> 2.7.4
--
Ville Syrjälä
Intel OTC
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