drm/bridge/sii8620: rewrite hdmi start sequence

MHL3 protocol requires registry adjustments depending on chosen video mode.
Necessary information is gathered in mode_fixup callback. In case of HDMI
video modes driver should also send special AVI and MHL3 infoframes.
The patch introduces generic helpers for handling MHL3 infoframes, in
case of appearance of other users of MHL3 infoframes these function can
be moved to common library.

Signed-off-by: Andrzej Hajda <a.hajda@samsung.com>
Signed-off-by: Archit Taneja <architt@codeaurora.org>
Link: http://patchwork.freedesktop.org/patch/msgid/1485935272-17337-21-git-send-email-a.hajda@samsung.com

1 files changed, 251 insertions, 29 deletions

diff --git a/drivers/gpu/drm/bridge/sil-sii8620.c b/drivers/gpu/drm/bridge/sil-sii8620.c
index 80ff64322fa0..c8d06d6123c3 100644
--- a/drivers/gpu/drm/bridge/sil-sii8620.c
+++ b/drivers/gpu/drm/bridge/sil-sii8620.c
@@ -32,6 +32,8 @@
 
 #define SII8620_BURST_BUF_LEN 288
 #define VAL_RX_HDMI_CTRL2_DEFVAL VAL_RX_HDMI_CTRL2_IDLE_CNT(3)
+#define MHL1_MAX_LCLK 225000
+#define MHL3_MAX_LCLK 600000
 
 enum sii8620_mode {
 	CM_DISCONNECTED,
@@ -62,6 +64,9 @@ struct sii8620 {
 	struct regulator_bulk_data supplies[2];
 	struct mutex lock; /* context lock, protects fields below */
 	int error;
+	int pixel_clock;
+	unsigned int use_packed_pixel:1;
+	int video_code;
 	enum sii8620_mode mode;
 	enum sii8620_sink_type sink_type;
 	u8 cbus_status;
@@ -69,7 +74,7 @@ struct sii8620 {
 	u8 xstat[MHL_XDS_SIZE];
 	u8 devcap[MHL_DCAP_SIZE];
 	u8 xdevcap[MHL_XDC_SIZE];
-	u8 avif[19];
+	u8 avif[HDMI_INFOFRAME_SIZE(AVI)];
 	struct edid *edid;
 	unsigned int gen2_write_burst:1;
 	enum sii8620_mt_state mt_state;
@@ -686,6 +691,40 @@ static void sii8620_burst_tx_rbuf_info(struct sii8620 *ctx, int size)
 	d->size = cpu_to_le16(size);
 }
 
+static u8 sii8620_checksum(void *ptr, int size)
+{
+	u8 *d = ptr, sum = 0;
+
+	while (size--)
+		sum += *d++;
+
+	return sum;
+}
+
+static void sii8620_mhl_burst_hdr_set(struct mhl3_burst_header *h,
+	enum mhl_burst_id id)
+{
+	h->id = cpu_to_be16(id);
+	h->total_entries = 1;
+	h->sequence_index = 1;
+}
+
+static void sii8620_burst_tx_bits_per_pixel_fmt(struct sii8620 *ctx, u8 fmt)
+{
+	struct mhl_burst_bits_per_pixel_fmt *d;
+	const int size = sizeof(*d) + sizeof(d->desc[0]);
+
+	d = sii8620_burst_get_tx_buf(ctx, size);
+	if (!d)
+		return;
+
+	sii8620_mhl_burst_hdr_set(&d->hdr, MHL_BURST_ID_BITS_PER_PIXEL_FMT);
+	d->num_entries = 1;
+	d->desc[0].stream_id = 0;
+	d->desc[0].pixel_format = fmt;
+	d->hdr.checksum -= sii8620_checksum(d, size);
+}
+
 static void sii8620_burst_rx_all(struct sii8620 *ctx)
 {
 	u8 *d = ctx->burst.rx_buf;
@@ -950,32 +989,193 @@ static void sii8620_stop_video(struct sii8620 *ctx)
 	sii8620_write(ctx, REG_TPI_SC, val);
 }
 
+static void sii8620_set_format(struct sii8620 *ctx)
+{
+	u8 out_fmt;
+
+	if (sii8620_is_mhl3(ctx)) {
+		sii8620_setbits(ctx, REG_M3_P0CTRL,
+				BIT_M3_P0CTRL_MHL3_P0_PIXEL_MODE_PACKED,
+				ctx->use_packed_pixel ? ~0 : 0);
+	} else {
+		if (ctx->use_packed_pixel)
+			sii8620_write_seq_static(ctx,
+				REG_VID_MODE, BIT_VID_MODE_M1080P,
+				REG_MHL_TOP_CTL, BIT_MHL_TOP_CTL_MHL_PP_SEL | 1,
+				REG_MHLTX_CTL6, 0x60
+			);
+		else
+			sii8620_write_seq_static(ctx,
+				REG_VID_MODE, 0,
+				REG_MHL_TOP_CTL, 1,
+				REG_MHLTX_CTL6, 0xa0
+			);
+	}
+
+	if (ctx->use_packed_pixel)
+		out_fmt = VAL_TPI_FORMAT(YCBCR422, FULL) |
+			BIT_TPI_OUTPUT_CSCMODE709;
+	else
+		out_fmt = VAL_TPI_FORMAT(RGB, FULL);
+
+	sii8620_write_seq(ctx,
+		REG_TPI_INPUT, VAL_TPI_FORMAT(RGB, FULL),
+		REG_TPI_OUTPUT, out_fmt,
+	);
+}
+
+static int mhl3_infoframe_init(struct mhl3_infoframe *frame)
+{
+	memset(frame, 0, sizeof(*frame));
+
+	frame->version = 3;
+	frame->hev_format = -1;
+	return 0;
+}
+
+static ssize_t mhl3_infoframe_pack(struct mhl3_infoframe *frame,
+		 void *buffer, size_t size)
+{
+	const int frm_len = HDMI_INFOFRAME_HEADER_SIZE + MHL3_INFOFRAME_SIZE;
+	u8 *ptr = buffer;
+
+	if (size < frm_len)
+		return -ENOSPC;
+
+	memset(buffer, 0, size);
+	ptr[0] = HDMI_INFOFRAME_TYPE_VENDOR;
+	ptr[1] = frame->version;
+	ptr[2] = MHL3_INFOFRAME_SIZE;
+	ptr[4] = MHL3_IEEE_OUI & 0xff;
+	ptr[5] = (MHL3_IEEE_OUI >> 8) & 0xff;
+	ptr[6] = (MHL3_IEEE_OUI >> 16) & 0xff;
+	ptr[7] = frame->video_format & 0x3;
+	ptr[7] |= (frame->format_type & 0x7) << 2;
+	ptr[7] |= frame->sep_audio ? BIT(5) : 0;
+	if (frame->hev_format >= 0) {
+		ptr[9] = 1;
+		ptr[10] = (frame->hev_format >> 8) & 0xff;
+		ptr[11] = frame->hev_format & 0xff;
+	}
+	if (frame->av_delay) {
+		bool sign = frame->av_delay < 0;
+		int delay = sign ? -frame->av_delay : frame->av_delay;
+
+		ptr[12] = (delay >> 16) & 0xf;
+		if (sign)
+			ptr[12] |= BIT(4);
+		ptr[13] = (delay >> 8) & 0xff;
+		ptr[14] = delay & 0xff;
+	}
+	ptr[3] -= sii8620_checksum(buffer, frm_len);
+	return frm_len;
+}
+
+static void sii8620_set_infoframes(struct sii8620 *ctx)
+{
+	struct mhl3_infoframe mhl_frm;
+	union hdmi_infoframe frm;
+	u8 buf[31];
+	int ret;
+
+	if (!sii8620_is_mhl3(ctx) || !ctx->use_packed_pixel) {
+		sii8620_write(ctx, REG_TPI_SC,
+			BIT_TPI_SC_TPI_OUTPUT_MODE_0_HDMI);
+		sii8620_write_buf(ctx, REG_TPI_AVI_CHSUM, ctx->avif + 3,
+			ARRAY_SIZE(ctx->avif) - 3);
+		sii8620_write(ctx, REG_PKT_FILTER_0,
+			BIT_PKT_FILTER_0_DROP_CEA_GAMUT_PKT |
+			BIT_PKT_FILTER_0_DROP_MPEG_PKT |
+			BIT_PKT_FILTER_0_DROP_GCP_PKT,
+			BIT_PKT_FILTER_1_DROP_GEN_PKT);
+		return;
+	}
+
+	ret = hdmi_avi_infoframe_init(&frm.avi);
+	frm.avi.colorspace = HDMI_COLORSPACE_YUV422;
+	frm.avi.active_aspect = HDMI_ACTIVE_ASPECT_PICTURE;
+	frm.avi.picture_aspect = HDMI_PICTURE_ASPECT_16_9;
+	frm.avi.colorimetry = HDMI_COLORIMETRY_ITU_709;
+	frm.avi.video_code = ctx->video_code;
+	if (!ret)
+		ret = hdmi_avi_infoframe_pack(&frm.avi, buf, ARRAY_SIZE(buf));
+	if (ret > 0)
+		sii8620_write_buf(ctx, REG_TPI_AVI_CHSUM, buf + 3, ret - 3);
+	sii8620_write(ctx, REG_PKT_FILTER_0,
+		BIT_PKT_FILTER_0_DROP_CEA_GAMUT_PKT |
+		BIT_PKT_FILTER_0_DROP_MPEG_PKT |
+		BIT_PKT_FILTER_0_DROP_AVI_PKT |
+		BIT_PKT_FILTER_0_DROP_GCP_PKT,
+		BIT_PKT_FILTER_1_VSI_OVERRIDE_DIS |
+		BIT_PKT_FILTER_1_DROP_GEN_PKT |
+		BIT_PKT_FILTER_1_DROP_VSIF_PKT);
+
+	sii8620_write(ctx, REG_TPI_INFO_FSEL, BIT_TPI_INFO_FSEL_EN
+		| BIT_TPI_INFO_FSEL_RPT | VAL_TPI_INFO_FSEL_VSI);
+	ret = mhl3_infoframe_init(&mhl_frm);
+	if (!ret)
+		ret = mhl3_infoframe_pack(&mhl_frm, buf, ARRAY_SIZE(buf));
+	sii8620_write_buf(ctx, REG_TPI_INFO_B0, buf, ret);
+}
+
 static void sii8620_start_hdmi(struct sii8620 *ctx)
 {
 	sii8620_write_seq_static(ctx,
 		REG_RX_HDMI_CTRL2, VAL_RX_HDMI_CTRL2_DEFVAL
 			| BIT_RX_HDMI_CTRL2_USE_AV_MUTE,
 		REG_VID_OVRRD, BIT_VID_OVRRD_PP_AUTO_DISABLE
-			| BIT_VID_OVRRD_M1080P_OVRRD,
-		REG_VID_MODE, 0,
-		REG_MHL_TOP_CTL, 0x1,
-		REG_MHLTX_CTL6, 0xa0,
-		REG_TPI_INPUT, VAL_TPI_FORMAT(RGB, FULL),
-		REG_TPI_OUTPUT, VAL_TPI_FORMAT(RGB, FULL),
-	);
-
-	sii8620_mt_write_stat(ctx, MHL_DST_REG(LINK_MODE),
-			      MHL_DST_LM_CLK_MODE_NORMAL |
-			      MHL_DST_LM_PATH_ENABLED);
+			| BIT_VID_OVRRD_M1080P_OVRRD);
+	sii8620_set_format(ctx);
 
-	sii8620_set_auto_zone(ctx);
+	if (!sii8620_is_mhl3(ctx)) {
+		sii8620_mt_write_stat(ctx, MHL_DST_REG(LINK_MODE),
+			MHL_DST_LM_CLK_MODE_NORMAL | MHL_DST_LM_PATH_ENABLED);
+		sii8620_set_auto_zone(ctx);
+	} else {
+		static const struct {
+			int max_clk;
+			u8 zone;
+			u8 link_rate;
+			u8 rrp_decode;
+		} clk_spec[] = {
+			{ 150000, VAL_TX_ZONE_CTL3_TX_ZONE_1_5GBPS,
+			  MHL_XDS_LINK_RATE_1_5_GBPS, 0x38 },
+			{ 300000, VAL_TX_ZONE_CTL3_TX_ZONE_3GBPS,
+			  MHL_XDS_LINK_RATE_3_0_GBPS, 0x40 },
+			{ 600000, VAL_TX_ZONE_CTL3_TX_ZONE_6GBPS,
+			  MHL_XDS_LINK_RATE_6_0_GBPS, 0x40 },
+		};
+		u8 p0_ctrl = BIT_M3_P0CTRL_MHL3_P0_PORT_EN;
+		int clk = ctx->pixel_clock * (ctx->use_packed_pixel ? 2 : 3);
+		int i;
+
+		for (i = 0; i < ARRAY_SIZE(clk_spec); ++i)
+			if (clk < clk_spec[i].max_clk)
+				break;
 
-	sii8620_write(ctx, REG_TPI_SC, BIT_TPI_SC_TPI_OUTPUT_MODE_0_HDMI);
+		if (100 * clk >= 98 * clk_spec[i].max_clk)
+			p0_ctrl |= BIT_M3_P0CTRL_MHL3_P0_UNLIMIT_EN;
 
-	sii8620_write_buf(ctx, REG_TPI_AVI_CHSUM, ctx->avif,
-			  ARRAY_SIZE(ctx->avif));
+		sii8620_burst_tx_bits_per_pixel_fmt(ctx, ctx->use_packed_pixel);
+		sii8620_burst_send(ctx);
+		sii8620_write_seq(ctx,
+			REG_MHL_DP_CTL0, 0xf0,
+			REG_MHL3_TX_ZONE_CTL, clk_spec[i].zone);
+		sii8620_setbits(ctx, REG_M3_P0CTRL,
+			BIT_M3_P0CTRL_MHL3_P0_PORT_EN
+			| BIT_M3_P0CTRL_MHL3_P0_UNLIMIT_EN, p0_ctrl);
+		sii8620_setbits(ctx, REG_M3_POSTM, MSK_M3_POSTM_RRP_DECODE,
+			clk_spec[i].rrp_decode);
+		sii8620_write_seq_static(ctx,
+			REG_M3_CTRL, VAL_M3_CTRL_MHL3_VALUE
+				| BIT_M3_CTRL_H2M_SWRST,
+			REG_M3_CTRL, VAL_M3_CTRL_MHL3_VALUE
+		);
+		sii8620_mt_write_stat(ctx, MHL_XDS_REG(AVLINK_MODE_CONTROL),
+			clk_spec[i].link_rate);
+	}
 
-	sii8620_write(ctx, REG_PKT_FILTER_0, 0xa1, 0x2);
+	sii8620_set_infoframes(ctx);
 }
 
 static void sii8620_start_video(struct sii8620 *ctx)
@@ -1835,22 +2035,44 @@ static bool sii8620_mode_fixup(struct drm_bridge *bridge,
 			       struct drm_display_mode *adjusted_mode)
 {
 	struct sii8620 *ctx = bridge_to_sii8620(bridge);
-	bool ret = false;
-	int max_clock = 74250;
-
-	mutex_lock(&ctx->lock);
-
-	if (mode->flags & DRM_MODE_FLAG_INTERLACE)
-		goto out;
+	int max_lclk;
+	bool ret = true;
 
-	if (ctx->devcap[MHL_DCAP_VID_LINK_MODE] & MHL_DCAP_VID_LINK_PPIXEL)
-		max_clock = 300000;
+	if (adjusted_mode->flags & DRM_MODE_FLAG_INTERLACE)
+		return false;
 
-	ret = mode->clock <= max_clock;
+	mutex_lock(&ctx->lock);
 
-out:
+	max_lclk = sii8620_is_mhl3(ctx) ? MHL3_MAX_LCLK : MHL1_MAX_LCLK;
+	if (max_lclk > 3 * adjusted_mode->clock) {
+		ctx->use_packed_pixel = 0;
+		goto end;
+	}
+	if ((ctx->devcap[MHL_DCAP_VID_LINK_MODE] & MHL_DCAP_VID_LINK_PPIXEL) &&
+	    max_lclk > 2 * adjusted_mode->clock) {
+		ctx->use_packed_pixel = 1;
+		goto end;
+	}
+	ret = false;
+end:
+	if (ret) {
+		u8 vic = drm_match_cea_mode(adjusted_mode);
+
+		if (!vic) {
+			union hdmi_infoframe frm;
+			u8 mhl_vic[] = { 0, 95, 94, 93, 98 };
+
+			drm_hdmi_vendor_infoframe_from_display_mode(
+				&frm.vendor.hdmi, adjusted_mode);
+			vic = frm.vendor.hdmi.vic;
+			if (vic >= ARRAY_SIZE(mhl_vic))
+				vic = 0;
+			vic = mhl_vic[vic];
+		}
+		ctx->video_code = vic;
+		ctx->pixel_clock = adjusted_mode->clock;
+	}
 	mutex_unlock(&ctx->lock);
-
 	return ret;
 }