linux-kernel - [PATCH v2] drm/msm/dsi: Add parentheses to quirks check in dsi_phy_hw_v3_0_lane

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Message-Id: <20190619191722.25811-1-natechancellor@gmail.com>
Date:   Wed, 19 Jun 2019 12:17:23 -0700
From:   Nathan Chancellor <natechancellor@...il.com>
To:     Rob Clark <robdclark@...il.com>, Sean Paul <sean@...rly.run>
Cc:     linux-arm-msm@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        freedreno@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
        clang-built-linux@...glegroups.com,
        Nathan Chancellor <natechancellor@...il.com>,
        kbuild test robot <lkp@...el.com>,
        Jeffrey Hugo <jeffrey.l.hugo@...il.com>
Subject: [PATCH v2] drm/msm/dsi: Add parentheses to quirks check in dsi_phy_hw_v3_0_lane_settings

Clang warns:

drivers/gpu/drm/msm/dsi/phy/dsi_phy_10nm.c:80:6: warning: logical not is
only applied to the left hand side of this bitwise operator
[-Wlogical-not-parentheses]
        if (!phy->cfg->quirks & V3_0_0_10NM_OLD_TIMINGS_QUIRK) {
            ^                 ~
drivers/gpu/drm/msm/dsi/phy/dsi_phy_10nm.c:80:6: note: add parentheses
after the '!' to evaluate the bitwise operator first
        if (!phy->cfg->quirks & V3_0_0_10NM_OLD_TIMINGS_QUIRK) {
            ^
             (                                               )
drivers/gpu/drm/msm/dsi/phy/dsi_phy_10nm.c:80:6: note: add parentheses
around left hand side expression to silence this warning
        if (!phy->cfg->quirks & V3_0_0_10NM_OLD_TIMINGS_QUIRK) {
            ^
            (                )
1 warning generated.

Add parentheses around the bitwise AND so it is evaluated first then
negated.

Fixes: 3dbbf8f09e83 ("drm/msm/dsi: Add old timings quirk for 10nm phy")
Link: https://github.com/ClangBuiltLinux/linux/issues/547
Reported-by: kbuild test robot <lkp@...el.com>
Reviewed-by: Jeffrey Hugo <jeffrey.l.hugo@...il.com>
Reviewed-by: Sean Paul <sean@...rly.run>
Signed-off-by: Nathan Chancellor <natechancellor@...il.com>
---

v1 -> v2:

* Fix broken link (thanks to Sean for pointing it out)
* Add Sean's reviewed-by

 drivers/gpu/drm/msm/dsi/phy/dsi_phy_10nm.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/msm/dsi/phy/dsi_phy_10nm.c b/drivers/gpu/drm/msm/dsi/phy/dsi_phy_10nm.c
index eb28937f4b34..47403d4f2d28 100644
--- a/drivers/gpu/drm/msm/dsi/phy/dsi_phy_10nm.c
+++ b/drivers/gpu/drm/msm/dsi/phy/dsi_phy_10nm.c
@@ -77,7 +77,7 @@ static void dsi_phy_hw_v3_0_lane_settings(struct msm_dsi_phy *phy)
 			      tx_dctrl[i]);
 	}
 
-	if (!phy->cfg->quirks & V3_0_0_10NM_OLD_TIMINGS_QUIRK) {
+	if (!(phy->cfg->quirks & V3_0_0_10NM_OLD_TIMINGS_QUIRK)) {
 		/* Toggle BIT 0 to release freeze I/0 */
 		dsi_phy_write(lane_base + REG_DSI_10nm_PHY_LN_TX_DCTRL(3), 0x05);
 		dsi_phy_write(lane_base + REG_DSI_10nm_PHY_LN_TX_DCTRL(3), 0x04);
-- 
2.22.0