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From:   Nathan Chancellor <natechancellor@gmail.com>
To:     Mauro Carvalho Chehab <mchehab@kernel.org>
Cc:     Sakari Ailus <sakari.ailus@linux.intel.com>,
        linux-media@vger.kernel.org, devel@driverdev.osuosl.org,
        linux-kernel@vger.kernel.org, clang-built-linux@googlegroups.com,
        Nathan Chancellor <natechancellor@gmail.com>
Subject: [PATCH 3/7] media: atomisp: Add stub for atomisp_mrfld_power
Date:   Wed, 27 May 2020 00:11:46 -0700
Message-Id: <20200527071150.3381228-4-natechancellor@gmail.com>
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Clang warns:

../drivers/staging/media/atomisp/pci/atomisp_v4l2.c:764:12: warning:
unused function 'atomisp_mrfld_power' [-Wunused-function]
static int atomisp_mrfld_power(struct atomisp_device *isp, bool enable)
           ^

Use an '#if 0' preprocessor define to hide the broken code, leaving the
FIXME comment intact, and creating an atomisp_mrfld_power stub function
that just returns 0.

Fixes: 95d1f398c4dc ("media: atomisp: keep the ISP powered on when setting it")
Link: https://github.com/ClangBuiltLinux/linux/issues/1036
Signed-off-by: Nathan Chancellor <natechancellor@gmail.com>
---
 drivers/staging/media/atomisp/pci/atomisp_v4l2.c | 13 +++++++++----
 1 file changed, 9 insertions(+), 4 deletions(-)

diff --git a/drivers/staging/media/atomisp/pci/atomisp_v4l2.c b/drivers/staging/media/atomisp/pci/atomisp_v4l2.c
index c42999a55303..41aa6018d254 100644
--- a/drivers/staging/media/atomisp/pci/atomisp_v4l2.c
+++ b/drivers/staging/media/atomisp/pci/atomisp_v4l2.c
@@ -736,6 +736,8 @@ static int atomisp_mrfld_pre_power_down(struct atomisp_device *isp)
 * WA for DDR DVFS enable/disable
 * By default, ISP will force DDR DVFS 1600MHz before disable DVFS
 */
+/* FIXME: at least with ISP2401, the code below causes the driver to break */
+#if 0
 static void punit_ddr_dvfs_enable(bool enable)
 {
 	int door_bell = 1 << 8;
@@ -820,20 +822,23 @@ static int atomisp_mrfld_power(struct atomisp_device *isp, bool enable)
 	dev_err(isp->dev, "IUNIT power-%s timeout.\n", enable ? "on" : "off");
 	return -EBUSY;
 }
+#else
+static int atomisp_mrfld_power(struct atomisp_device *isp, bool enable)
+{
+	return 0;
+}
+#endif
 
 /* Workaround for pmu_nc_set_power_state not ready in MRFLD */
 int atomisp_mrfld_power_down(struct atomisp_device *isp)
 {
-	return 0;
-// FIXME: at least with ISP2401, the code below causes the driver to break
-//	return atomisp_mrfld_power(isp, false);
+	return atomisp_mrfld_power(isp, false);
 }
 
 /* Workaround for pmu_nc_set_power_state not ready in MRFLD */
 int atomisp_mrfld_power_up(struct atomisp_device *isp)
 {
 	return 0;
-// FIXME: at least with ISP2401, the code below causes the driver to break
 //	return atomisp_mrfld_power(isp, true);
 }
 
-- 
2.27.0.rc0