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authorBenjamin Herrenschmidt <benh@kernel.crashing.org>2017-02-17 13:57:30 +1100
committerDave Airlie <airlied@redhat.com>2017-02-28 13:14:22 +1000
commit6475a7cce61967fca4dd793b60acf5a7dc70bc9a (patch)
treebb37714e4493a0757c5b97de3631a29eded9edf6 /drivers/gpu
parentcf2f6bd402470caed4e4d75b783d2d48277a3568 (diff)
downloadlinux-6475a7cce61967fca4dd793b60acf5a7dc70bc9a.tar.bz2
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>
Diffstat (limited to 'drivers/gpu')
-rw-r--r--drivers/gpu/drm/ast/ast_main.c6
1 files changed, 4 insertions, 2 deletions
diff --git a/drivers/gpu/drm/ast/ast_main.c b/drivers/gpu/drm/ast/ast_main.c
index 29ab2c11db41..fd167008be31 100644
--- a/drivers/gpu/drm/ast/ast_main.c
+++ b/drivers/gpu/drm/ast/ast_main.c
@@ -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)