linux-kernel - [PATCH] drm/vc4: Update type of reg parameter in vc4_hdmi

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Date:   Thu, 10 Sep 2020 10:04:02 -0700
From:   Nathan Chancellor <natechancellor@...il.com>
To:     Eric Anholt <eric@...olt.net>, Maxime Ripard <maxime@...no.tech>
Cc:     dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
        clang-built-linux@...glegroups.com,
        Nathan Chancellor <natechancellor@...il.com>
Subject: [PATCH] drm/vc4: Update type of reg parameter in vc4_hdmi_{read,write}

Clang warns 100+ times in the vc4 driver along the lines of:

drivers/gpu/drm/vc4/vc4_hdmi_phy.c:518:13: warning: implicit conversion
from enumeration type 'enum vc4_hdmi_field' to different enumeration
type 'enum vc4_hdmi_regs' [-Wenum-conversion]
        HDMI_WRITE(HDMI_TX_PHY_POWERDOWN_CTL,
        ~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~

The HDMI_READ and HDMI_WRITE macros pass in enumerators of type
vc4_hdmi_field but vc4_hdmi_write and vc4_hdmi_read expect a enumerator
of type vc4_hdmi_regs, causing a warning for every instance of this.
Update the parameter type so there is no more mismatch.

Fixes: 311e305fdb4e ("drm/vc4: hdmi: Implement a register layout abstraction")
Link: https://github.com/ClangBuiltLinux/linux/issues/1149
Signed-off-by: Nathan Chancellor <natechancellor@...il.com>
---

Note, the variable names in these functions do not really make much
sense after this patch but attempting to flip the variable names made
everything feel even weirder. Feel free to rewrite this in whatever way
you prefer, I just don't want my builds to be chalk full of warnings :)

 drivers/gpu/drm/vc4/vc4_hdmi_regs.h | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/vc4/vc4_hdmi_regs.h b/drivers/gpu/drm/vc4/vc4_hdmi_regs.h
index 47364bd3960d..7c6b4818f245 100644
--- a/drivers/gpu/drm/vc4/vc4_hdmi_regs.h
+++ b/drivers/gpu/drm/vc4/vc4_hdmi_regs.h
@@ -392,7 +392,7 @@ void __iomem *__vc4_hdmi_get_field_base(struct vc4_hdmi *hdmi,
 }
 
 static inline u32 vc4_hdmi_read(struct vc4_hdmi *hdmi,
-				enum vc4_hdmi_regs reg)
+				enum vc4_hdmi_field reg)
 {
 	const struct vc4_hdmi_register *field;
 	const struct vc4_hdmi_variant *variant = hdmi->variant;
@@ -417,7 +417,7 @@ static inline u32 vc4_hdmi_read(struct vc4_hdmi *hdmi,
 #define HDMI_READ(reg)		vc4_hdmi_read(vc4_hdmi, reg)
 
 static inline void vc4_hdmi_write(struct vc4_hdmi *hdmi,
-				  enum vc4_hdmi_regs reg,
+				  enum vc4_hdmi_field reg,
 				  u32 value)
 {
 	const struct vc4_hdmi_register *field;

base-commit: 8c3c818c23a5bbce6ff180dd2ee04415241df77c
-- 
2.28.0