Re: [v3,PATCH 2/3] pwm: mtk_disp: convert the driver to atomic API

From: kernel test robot
Date: Tue Apr 06 2021 - 10:37:49 EST

Hi Rex-BC,

Thank you for the patch! Perhaps something to improve:

[auto build test WARNING on v5.12-rc6]
[also build test WARNING on next-20210406]
[cannot apply to pwm/for-next]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch]

url: https://github.com/0day-ci/linux/commits/Rex-BC-Chen/Convert-the-mtk_disp-driver-to-aotmic-API/20210406-180018
base: e49d033bddf5b565044e2abe4241353959bc9120
config: powerpc64-randconfig-r023-20210406 (attached as .config)
compiler: clang version 13.0.0 (https://github.com/llvm/llvm-project a46f59a747a7273cc439efaf3b4f98d8b63d2f20)
reproduce (this is a W=1 build):
wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
chmod +x ~/bin/make.cross
# install powerpc64 cross compiling tool for clang build
# apt-get install binutils-powerpc64-linux-gnu
# https://github.com/0day-ci/linux/commit/0a2486ac437e3b8d36a0bf8ce9648c22e42ffda4
git remote add linux-review https://github.com/0day-ci/linux
git fetch --no-tags linux-review Rex-BC-Chen/Convert-the-mtk_disp-driver-to-aotmic-API/20210406-180018
git checkout 0a2486ac437e3b8d36a0bf8ce9648c22e42ffda4
# save the attached .config to linux build tree
COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=powerpc64

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@xxxxxxxxx>

All warnings (new ones prefixed by >>):

^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
arch/powerpc/include/asm/io.h:616:3: note: expanded from macro 'DEF_PCI_AC_NORET'
__do_##name al; \
^~~~~~~~~~~~~~
<scratch space>:155:1: note: expanded from here
__do_outl
^
arch/powerpc/include/asm/io.h:537:62: note: expanded from macro '__do_outl'
#define __do_outl(val, port) writel(val,(PCI_IO_ADDR)_IO_BASE+port);
~~~~~~~~~~~~~~~~~~~~~^
In file included from drivers/pwm/pwm-mtk-disp.c:10:
In file included from include/linux/io.h:13:
In file included from arch/powerpc/include/asm/io.h:619:
arch/powerpc/include/asm/io-defs.h:43:1: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
DEF_PCI_AC_NORET(insb, (unsigned long p, void *b, unsigned long c),
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
arch/powerpc/include/asm/io.h:616:3: note: expanded from macro 'DEF_PCI_AC_NORET'
__do_##name al; \
^~~~~~~~~~~~~~
<scratch space>:169:1: note: expanded from here
__do_insb
^
arch/powerpc/include/asm/io.h:556:56: note: expanded from macro '__do_insb'
#define __do_insb(p, b, n) readsb((PCI_IO_ADDR)_IO_BASE+(p), (b), (n))
~~~~~~~~~~~~~~~~~~~~~^
In file included from drivers/pwm/pwm-mtk-disp.c:10:
In file included from include/linux/io.h:13:
In file included from arch/powerpc/include/asm/io.h:619:
arch/powerpc/include/asm/io-defs.h:45:1: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
DEF_PCI_AC_NORET(insw, (unsigned long p, void *b, unsigned long c),
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
arch/powerpc/include/asm/io.h:616:3: note: expanded from macro 'DEF_PCI_AC_NORET'
__do_##name al; \
^~~~~~~~~~~~~~
<scratch space>:171:1: note: expanded from here
__do_insw
^
arch/powerpc/include/asm/io.h:557:56: note: expanded from macro '__do_insw'
#define __do_insw(p, b, n) readsw((PCI_IO_ADDR)_IO_BASE+(p), (b), (n))
~~~~~~~~~~~~~~~~~~~~~^
In file included from drivers/pwm/pwm-mtk-disp.c:10:
In file included from include/linux/io.h:13:
In file included from arch/powerpc/include/asm/io.h:619:
arch/powerpc/include/asm/io-defs.h:47:1: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
DEF_PCI_AC_NORET(insl, (unsigned long p, void *b, unsigned long c),
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
arch/powerpc/include/asm/io.h:616:3: note: expanded from macro 'DEF_PCI_AC_NORET'
__do_##name al; \
^~~~~~~~~~~~~~
<scratch space>:173:1: note: expanded from here
__do_insl
^
arch/powerpc/include/asm/io.h:558:56: note: expanded from macro '__do_insl'
#define __do_insl(p, b, n) readsl((PCI_IO_ADDR)_IO_BASE+(p), (b), (n))
~~~~~~~~~~~~~~~~~~~~~^
In file included from drivers/pwm/pwm-mtk-disp.c:10:
In file included from include/linux/io.h:13:
In file included from arch/powerpc/include/asm/io.h:619:
arch/powerpc/include/asm/io-defs.h:49:1: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
DEF_PCI_AC_NORET(outsb, (unsigned long p, const void *b, unsigned long c),
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
arch/powerpc/include/asm/io.h:616:3: note: expanded from macro 'DEF_PCI_AC_NORET'
__do_##name al; \
^~~~~~~~~~~~~~
<scratch space>:175:1: note: expanded from here
__do_outsb
^
arch/powerpc/include/asm/io.h:559:58: note: expanded from macro '__do_outsb'
#define __do_outsb(p, b, n) writesb((PCI_IO_ADDR)_IO_BASE+(p),(b),(n))
~~~~~~~~~~~~~~~~~~~~~^
In file included from drivers/pwm/pwm-mtk-disp.c:10:
In file included from include/linux/io.h:13:
In file included from arch/powerpc/include/asm/io.h:619:
arch/powerpc/include/asm/io-defs.h:51:1: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
DEF_PCI_AC_NORET(outsw, (unsigned long p, const void *b, unsigned long c),
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
arch/powerpc/include/asm/io.h:616:3: note: expanded from macro 'DEF_PCI_AC_NORET'
__do_##name al; \
^~~~~~~~~~~~~~
<scratch space>:177:1: note: expanded from here
__do_outsw
^
arch/powerpc/include/asm/io.h:560:58: note: expanded from macro '__do_outsw'
#define __do_outsw(p, b, n) writesw((PCI_IO_ADDR)_IO_BASE+(p),(b),(n))
~~~~~~~~~~~~~~~~~~~~~^
In file included from drivers/pwm/pwm-mtk-disp.c:10:
In file included from include/linux/io.h:13:
In file included from arch/powerpc/include/asm/io.h:619:
arch/powerpc/include/asm/io-defs.h:53:1: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
DEF_PCI_AC_NORET(outsl, (unsigned long p, const void *b, unsigned long c),
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
arch/powerpc/include/asm/io.h:616:3: note: expanded from macro 'DEF_PCI_AC_NORET'
__do_##name al; \
^~~~~~~~~~~~~~
<scratch space>:179:1: note: expanded from here
__do_outsl
^
arch/powerpc/include/asm/io.h:561:58: note: expanded from macro '__do_outsl'
#define __do_outsl(p, b, n) writesl((PCI_IO_ADDR)_IO_BASE+(p),(b),(n))
~~~~~~~~~~~~~~~~~~~~~^
>> drivers/pwm/pwm-mtk-disp.c:109:4: warning: format specifies type 'int' but the argument has type 'u64' (aka 'unsigned long long') [-Wformat]
rate);
^~~~
include/linux/dev_printk.h:112:32: note: expanded from macro 'dev_err'
_dev_err(dev, dev_fmt(fmt), ##__VA_ARGS__)
~~~ ^~~~~~~~~~~
13 warnings generated.


vim +109 drivers/pwm/pwm-mtk-disp.c

70
71 static int mtk_disp_pwm_enable(struct pwm_chip *chip,
72 const struct pwm_state *state)
73 {
74 struct mtk_disp_pwm *mdp = to_mtk_disp_pwm(chip);
75 u32 clk_div, period, high_width, value, polarity;
76 u64 div, rate;
77 int err;
78
79 /*
80 * Find period, high_width and clk_div to suit duty_ns and period_ns.
81 * Calculate proper div value to keep period value in the bound.
82 *
83 * period_ns = 10^9 * (clk_div + 1) * (period + 1) / PWM_CLK_RATE
84 * duty_ns = 10^9 * (clk_div + 1) * high_width / PWM_CLK_RATE
85 *
86 * period = (PWM_CLK_RATE * period_ns) / (10^9 * (clk_div + 1)) - 1
87 * high_width = (PWM_CLK_RATE * duty_ns) / (10^9 * (clk_div + 1))
88 */
89 if (!mdp->enabled) {
90 err = clk_prepare_enable(mdp->clk_main);
91 if (err < 0) {
92 dev_err(chip->dev, "Can't enable mdp->clk_main: %d\n",
93 err);
94 return err;
95 }
96 err = clk_prepare_enable(mdp->clk_mm);
97 if (err < 0) {
98 dev_err(chip->dev, "Can't enable mdp->clk_mm: %d\n",
99 err);
100 clk_disable_unprepare(mdp->clk_main);
101 return err;
102 }
103 }
104 rate = clk_get_rate(mdp->clk_main);
105 clk_div = div_u64(rate * state->period, NSEC_PER_SEC) >>
106 PWM_PERIOD_BIT_WIDTH;
107 if (clk_div > PWM_CLKDIV_MAX) {
108 dev_err(chip->dev, "clock rate is too high: rate = %d Hz\n",
> 109 rate);
110 clk_disable_unprepare(mdp->clk_mm);
111 clk_disable_unprepare(mdp->clk_main);
112 return -EINVAL;
113 }
114 div = NSEC_PER_SEC * (clk_div + 1);
115 period = div64_u64(rate * state->period, div);
116 if (period > 0)
117 period--;
118
119 high_width = div64_u64(rate * state->duty_cycle, div);
120 value = period | (high_width << PWM_HIGH_WIDTH_SHIFT);
121 polarity = 0;
122 if (state->polarity == PWM_POLARITY_INVERSED)
123 polarity = PWM_POLARITY;
124
125 mtk_disp_pwm_update_bits(mdp, mdp->data->con0,
126 PWM_CLKDIV_MASK,
127 clk_div << PWM_CLKDIV_SHIFT);
128 mtk_disp_pwm_update_bits(mdp, mdp->data->con0,
129 PWM_POLARITY, polarity);
130 mtk_disp_pwm_update_bits(mdp, mdp->data->con1,
131 PWM_PERIOD_MASK | PWM_HIGH_WIDTH_MASK,
132 value);
133
134 if (mdp->data->has_commit) {
135 mtk_disp_pwm_update_bits(mdp, mdp->data->commit,
136 mdp->data->commit_mask,
137 mdp->data->commit_mask);
138 mtk_disp_pwm_update_bits(mdp, mdp->data->commit,
139 mdp->data->commit_mask,
140 0x0);
141 } else {
142 mtk_disp_pwm_update_bits(mdp, mdp->data->bls_debug,
143 mdp->data->bls_debug_mask,
144 mdp->data->bls_debug_mask);
145 mtk_disp_pwm_update_bits(mdp, mdp->data->con0,
146 mdp->data->con0_sel,
147 mdp->data->con0_sel);
148 }
149
150 mtk_disp_pwm_update_bits(mdp, DISP_PWM_EN, mdp->data->enable_mask,
151 mdp->data->enable_mask);
152 mdp->enabled = true;
153 return 0;
154 }
155

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@xxxxxxxxxxxx

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