[PATCH v2 03/13] drm/bridge: samsung-dsim: add flag to control header FIFO wait

[Kaustabh Chakraborty]

Exynos7870's DSIM device doesn't require waiting for the header FIFO
during a MIPI DSI transfer. Add a flag in the driver data in order to
control said behavior.

Signed-off-by: Kaustabh Chakraborty <kauschluss at disroot.org>
---
 drivers/gpu/drm/bridge/samsung-dsim.c | 15 ++++++++++++---
 include/drm/bridge/samsung-dsim.h     |  1 +
 2 files changed, 13 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/bridge/samsung-dsim.c b/drivers/gpu/drm/bridge/samsung-dsim.c
index 3c716334f1a21bf446ebe17f810d5258dd9a4c24..112d558579d8f987c695e1704a5772ebbadfd625 100644
--- a/drivers/gpu/drm/bridge/samsung-dsim.c
+++ b/drivers/gpu/drm/bridge/samsung-dsim.c
@@ -417,6 +417,7 @@ static const struct samsung_dsim_driver_data exynos3_dsi_driver_data = {
 	.has_clklane_stop = 1,
 	.num_clks = 2,
 	.max_freq = 1000,
+	.wait_for_hdr_fifo = 1,
 	.wait_for_reset = 1,
 	.num_bits_resol = 11,
 	.pll_p_offset = 13,
@@ -436,6 +437,7 @@ static const struct samsung_dsim_driver_data exynos4_dsi_driver_data = {
 	.has_clklane_stop = 1,
 	.num_clks = 2,
 	.max_freq = 1000,
+	.wait_for_hdr_fifo = 1,
 	.wait_for_reset = 1,
 	.num_bits_resol = 11,
 	.pll_p_offset = 13,
@@ -453,6 +455,7 @@ static const struct samsung_dsim_driver_data exynos5_dsi_driver_data = {
 	.plltmr_reg = 0x58,
 	.num_clks = 2,
 	.max_freq = 1000,
+	.wait_for_hdr_fifo = 1,
 	.wait_for_reset = 1,
 	.num_bits_resol = 11,
 	.pll_p_offset = 13,
@@ -470,6 +473,7 @@ static const struct samsung_dsim_driver_data exynos5433_dsi_driver_data = {
 	.has_clklane_stop = 1,
 	.num_clks = 5,
 	.max_freq = 1500,
+	.wait_for_hdr_fifo = 1,
 	.wait_for_reset = 0,
 	.num_bits_resol = 12,
 	.pll_p_offset = 13,
@@ -487,6 +491,7 @@ static const struct samsung_dsim_driver_data exynos5422_dsi_driver_data = {
 	.has_clklane_stop = 1,
 	.num_clks = 2,
 	.max_freq = 1500,
+	.wait_for_hdr_fifo = 1,
 	.wait_for_reset = 1,
 	.num_bits_resol = 12,
 	.pll_p_offset = 13,
@@ -504,6 +509,7 @@ static const struct samsung_dsim_driver_data imx8mm_dsi_driver_data = {
 	.has_clklane_stop = 1,
 	.num_clks = 2,
 	.max_freq = 2100,
+	.wait_for_hdr_fifo = 1,
 	.wait_for_reset = 0,
 	.num_bits_resol = 12,
 	/*
@@ -1110,6 +1116,7 @@ static void samsung_dsim_send_to_fifo(struct samsung_dsim *dsi,
 {
 	struct device *dev = dsi->dev;
 	struct mipi_dsi_packet *pkt = &xfer->packet;
+	const struct samsung_dsim_driver_data *driver_data = dsi->driver_data;
 	const u8 *payload = pkt->payload + xfer->tx_done;
 	u16 length = pkt->payload_length - xfer->tx_done;
 	bool first = !xfer->tx_done;
@@ -1150,9 +1157,11 @@ static void samsung_dsim_send_to_fifo(struct samsung_dsim *dsi,
 		return;
 
 	reg = get_unaligned_le32(pkt->header);
-	if (samsung_dsim_wait_for_hdr_fifo(dsi)) {
-		dev_err(dev, "waiting for header FIFO timed out\n");
-		return;
+	if (driver_data->wait_for_hdr_fifo) {
+		if (samsung_dsim_wait_for_hdr_fifo(dsi)) {
+			dev_err(dev, "waiting for header FIFO timed out\n");
+			return;
+		}
 	}
 
 	if (NEQV(xfer->flags & MIPI_DSI_MSG_USE_LPM,
diff --git a/include/drm/bridge/samsung-dsim.h b/include/drm/bridge/samsung-dsim.h
index a50e4f521b9d9561f6a3b9fe3e174c0e140849a2..3641c57557f42fd90cd2e8c0282f69dbe36ba2de 100644
--- a/include/drm/bridge/samsung-dsim.h
+++ b/include/drm/bridge/samsung-dsim.h
@@ -60,6 +60,7 @@ struct samsung_dsim_driver_data {
 	unsigned int num_clks;
 	unsigned int min_freq;
 	unsigned int max_freq;
+	unsigned int wait_for_hdr_fifo;
 	unsigned int wait_for_reset;
 	unsigned int num_bits_resol;
 	unsigned int pll_p_offset;

-- 
2.49.0