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drm/ast: Fix calculation of MCLK 

Some braces were missing causing an incorrect calculation.

Y.C. Chen from Aspeed provided me with the right formula
which I tested on AST2400 and 2500.

The MCLK isn't currently used by the driver (it will eventually
to filter modes) so the issue isn't catastrophic.

Also make the printed value a bit more meaningful

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Acked-by: Joel Stanley <joel@jms.id.au>
Tested-by: Y.C. Chen <yc_chen@aspeedtech.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
This commit is contained in:
Benjamin Herrenschmidt 2017-02-17 13:57:30 +11:00 committed by Dave Airlie
parent cf2f6bd402
commit 6475a7cce6
1 changed files with 4 additions and 2 deletions
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6
drivers/gpu/drm/ast/ast_main.c
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@ -354,7 +354,7 @@ static int ast_get_dram_info(struct drm_device *dev)
div = 0x1;
break;
}
ast->mclk = ref_pll * (num + 2) / (denum + 2) * (div * 1000);
ast->mclk = ref_pll * (num + 2) / ((denum + 2) * (div * 1000));
return 0;
}
@ -498,7 +498,9 @@ int ast_driver_load(struct drm_device *dev, unsigned long flags)
if (ret)
goto out_free;
ast->vram_size = ast_get_vram_info(dev);
DRM_INFO("dram %d %d %d %08x\n", ast->mclk, ast->dram_type, ast->dram_bus_width, ast->vram_size);
DRM_INFO("dram MCLK=%u Mhz type=%d bus_width=%d size=%08x\n",
ast->mclk, ast->dram_type,
ast->dram_bus_width, ast->vram_size);
}
if (need_post)