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Subject[PATCH] drm/amd/powerplay: fix integer overflow warning
Date
A late bugfix for v4.7 introduced a build-time regression, producing
a (probably harmless) warning:

powerplay/hwmgr/polaris10_hwmgr.c: In function 'polaris10_populate_clock_stretcher_data_table':
powerplay/hwmgr/polaris10_hwmgr.c:1817:4: error: this decimal constant is unsigned only in ISO C90 [-Werror]
volt_without_cks = (uint32_t)((2753594000 + (sclk_table->entries[i].clk/100) * 136418 -(ro - 70) * 1000000) / \
^~~~~~~~~~~~~~~~
powerplay/hwmgr/polaris10_hwmgr.c:1822:4: error: this decimal constant is unsigned only in ISO C90 [-Werror]
volt_without_cks = (uint32_t)((2416794800 + (sclk_table->entries[i].clk/100) * 1476925/10 -(ro - 50) * 1000000) / \
^~~~~~~~~~~~~~~~
powerplay/hwmgr/polaris10_hwmgr.c:1824:4: error: this decimal constant is unsigned only in ISO C90 [-Werror]
volt_with_cks = (uint32_t)((2999656000 + sclk_table->entries[i].clk * 392803/100 - (ro - 44) * 1000000) / \

This marks the new integer literals unsigned, which makes the calculation
more sensible and avoids the warning.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Fixes: 0812a945fbb8 ("drm/amd/powerplay: Update CKS on/ CKS off voltage offset calculation")
---
drivers/gpu/drm/amd/powerplay/hwmgr/polaris10_hwmgr.c | 8 ++++----
1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/drivers/gpu/drm/amd/powerplay/hwmgr/polaris10_hwmgr.c b/drivers/gpu/drm/amd/powerplay/hwmgr/polaris10_hwmgr.c
index ec2a7ada346a..5b26bbbc3e79 100644
--- a/drivers/gpu/drm/amd/powerplay/hwmgr/polaris10_hwmgr.c
+++ b/drivers/gpu/drm/amd/powerplay/hwmgr/polaris10_hwmgr.c
@@ -1814,14 +1814,14 @@ static int polaris10_populate_clock_stretcher_data_table(struct pp_hwmgr *hwmgr)
data->smc_state_table.Sclk_CKS_masterEn0_7 |=
sclk_table->entries[i].cks_enable << i;
if (hwmgr->chip_id == CHIP_POLARIS10) {
- volt_without_cks = (uint32_t)((2753594000 + (sclk_table->entries[i].clk/100) * 136418 -(ro - 70) * 1000000) / \
+ volt_without_cks = (uint32_t)((2753594000u + (sclk_table->entries[i].clk/100) * 136418 -(ro - 70) * 1000000) / \
(2424180 - (sclk_table->entries[i].clk/100) * 1132925/1000));
- volt_with_cks = (uint32_t)((279720200 + sclk_table->entries[i].clk * 3232 - (ro - 65) * 100000000) / \
+ volt_with_cks = (uint32_t)((279720200u + sclk_table->entries[i].clk * 3232 - (ro - 65) * 100000000) / \
(252248000 - sclk_table->entries[i].clk/100 * 115764));
} else {
- volt_without_cks = (uint32_t)((2416794800 + (sclk_table->entries[i].clk/100) * 1476925/10 -(ro - 50) * 1000000) / \
+ volt_without_cks = (uint32_t)((2416794800u + (sclk_table->entries[i].clk/100) * 1476925/10 -(ro - 50) * 1000000) / \
(2625416 - (sclk_table->entries[i].clk/100) * 12586807/10000));
- volt_with_cks = (uint32_t)((2999656000 + sclk_table->entries[i].clk * 392803/100 - (ro - 44) * 1000000) / \
+ volt_with_cks = (uint32_t)((2999656000u + sclk_table->entries[i].clk * 392803/100 - (ro - 44) * 1000000) / \
(3422454 - sclk_table->entries[i].clk/100 * 18886376/10000));
}

--
2.9.0
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