Merge tag 'drm-misc-next-2023-09-11-1' of git://anongit.freedesktop.org/drm/drm-misc into drm-next

drm-misc-next for v6.7-rc1:

UAPI Changes:
- Nouveau changed to not set NO_PREFETCH flag explicitly.

Cross-subsystem Changes:
- Update documentation of dma-buf intro and uapi.
- fbdev/sbus fixes.
- Use initializer macros in a lot of fbdev drivers.
- Add Boris Brezillon as Panfrost driver maintainer.
- Add Jessica Zhang as drm/panel reviewer.
- Make more fbdev drivers use fb_ops helpers for deferred io.
- Small hid trailing whitespace fix.
- Use fb_ops in hid/picolcd

Core Changes:
- Assorted small fixes to ttm tests, drm/mst.
- Documentation updates to bridge.
- Add kunit tests for some drm_fb functions.
- Rework drm_debugfs implementation.
- Update xe documentation to mark todos as completed.

Driver Changes:
- Add support to rockchip for rv1126 mipi-dsi and vop.
- Assorted small fixes to nouveau, bridge/samsung-dsim,
  bridge/lvds-codec, loongson, rockchip, panfrost, gma500, repaper,
  komeda, virtio, ssd130x.
- Add support for simple panels Mitsubishi AA084XE01,
  JDI LPM102A188A,
- Documentation updates to accel/ivpu.
- Some nouveau scheduling/fence fixes.
- Power management related fixes and other fixes to ivpu.
- Assorted bridge/it66121 fixes.
- Make platform drivers return void in remove() callback.

Signed-off-by: Dave Airlie <airlied@redhat.com>

From: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/3da6554b-3b47-fe7d-c4ea-21f4f819dbb6@linux.intel.com

1 files changed, 17 insertions, 3 deletions

diff --git a/drivers/gpu/drm/bridge/samsung-dsim.c b/drivers/gpu/drm/bridge/samsung-dsim.c
index cf777bdb25d2..19bdb32dbc9a 100644
--- a/drivers/gpu/drm/bridge/samsung-dsim.c
+++ b/drivers/gpu/drm/bridge/samsung-dsim.c
@@ -385,7 +385,7 @@ static const unsigned int imx8mm_dsim_reg_values[] = {
 	[RESET_TYPE] = DSIM_SWRST,
 	[PLL_TIMER] = 500,
 	[STOP_STATE_CNT] = 0xf,
-	[PHYCTRL_ULPS_EXIT] = 0,
+	[PHYCTRL_ULPS_EXIT] = DSIM_PHYCTRL_ULPS_EXIT(0xaf),
 	[PHYCTRL_VREG_LP] = 0,
 	[PHYCTRL_SLEW_UP] = 0,
 	[PHYTIMING_LPX] = DSIM_PHYTIMING_LPX(0x06),
@@ -413,6 +413,7 @@ static const struct samsung_dsim_driver_data exynos3_dsi_driver_data = {
 	.m_min = 41,
 	.m_max = 125,
 	.min_freq = 500,
+	.has_broken_fifoctrl_emptyhdr = 1,
 };
 
 static const struct samsung_dsim_driver_data exynos4_dsi_driver_data = {
@@ -429,6 +430,7 @@ static const struct samsung_dsim_driver_data exynos4_dsi_driver_data = {
 	.m_min = 41,
 	.m_max = 125,
 	.min_freq = 500,
+	.has_broken_fifoctrl_emptyhdr = 1,
 };
 
 static const struct samsung_dsim_driver_data exynos5_dsi_driver_data = {
@@ -1010,8 +1012,20 @@ static int samsung_dsim_wait_for_hdr_fifo(struct samsung_dsim *dsi)
 	do {
 		u32 reg = samsung_dsim_read(dsi, DSIM_FIFOCTRL_REG);
 
-		if (reg & DSIM_SFR_HEADER_EMPTY)
-			return 0;
+		if (!dsi->driver_data->has_broken_fifoctrl_emptyhdr) {
+			if (reg & DSIM_SFR_HEADER_EMPTY)
+				return 0;
+		} else {
+			if (!(reg & DSIM_SFR_HEADER_FULL)) {
+				/*
+				 * Wait a little bit, so the pending data can
+				 * actually leave the FIFO to avoid overflow.
+				 */
+				if (!cond_resched())
+					usleep_range(950, 1050);
+				return 0;
+			}
+		}
 
 		if (!cond_resched())
 			usleep_range(950, 1050);