[PATCH 16/18] media: microchip-isc: enable userspace histogram statistics export
From: Balamanikandan Gunasundar <hidden>
Date: 2025-10-09 15:55:51
Also in:
linux-arm-kernel, linux-media, lkml
Subsystem:
media input infrastructure (v4l/dvb), microchip isc driver, the rest · Maintainers:
Mauro Carvalho Chehab, Eugen Hristev, Linus Torvalds
From: Balakrishnan Sambath <redacted> Export raw histogram data to userspace only when all 4 Bayer channels are ready and userspace has active listeners. Also continue AWB work as long as userspace listeners are active. Signed-off-by: Balakrishnan Sambath <redacted> Signed-off-by: Balamanikandan Gunasundar <redacted> --- drivers/media/platform/microchip/microchip-isc-base.c | 11 ++++++++++- 1 file changed, 10 insertions(+), 1 deletion(-)
diff --git a/drivers/media/platform/microchip/microchip-isc-base.c b/drivers/media/platform/microchip/microchip-isc-base.c
index cafd05244db2..6c937a20fce0 100644
--- a/drivers/media/platform/microchip/microchip-isc-base.c
+++ b/drivers/media/platform/microchip/microchip-isc-base.c@@ -1450,6 +1450,15 @@ static void isc_awb_work(struct work_struct *w) if (hist_id != ISC_HIS_CFG_MODE_B) { hist_id++; } else { + /* All 4 channels processed - notify userspace */ + if (isc_stats_active(&isc->stats)) + isc_stats_isr(&isc->stats); + else + dev_info(isc->dev, "No active userspace listeners\n"); + } + + /* Continue with AWB processing only if AWB is enabled */ + if (ctrls->awb != ISC_WB_NONE) { isc_wb_update(ctrls); hist_id = ISC_HIS_CFG_MODE_GR; }
@@ -1499,7 +1508,7 @@ static void isc_awb_work(struct work_struct *w) mutex_lock(&isc->awb_mutex); /* streaming is not active anymore */ - if (isc->stop) { + if (isc->stop && !isc_stats_active(&isc->stats)) { mutex_unlock(&isc->awb_mutex); return; }
--
2.34.1