[U-Boot] [PATCH] Exynos5: clock: Update the equation to calculate PLL output frequency
According to the latest exynos5 user manual, the equation for calculating PLL output was changed to FOUT= MDIV x FIN/(PDIV x 2^SDIV) earlier it was FOUT= MDIV x FIN/(PDIV x 2^(SDIV -1)) So updating the clock code accordingly.
Signed-off-by: Hatim Ali hatim.rv@samsung.com Signed-off-by: Akshay Saraswat akshay.s@samsung.com --- arch/arm/cpu/armv7/exynos/clock.c | 6 ++---- 1 file changed, 2 insertions(+), 4 deletions(-)
diff --git a/arch/arm/cpu/armv7/exynos/clock.c b/arch/arm/cpu/armv7/exynos/clock.c index 956427c..5299bc7 100644 --- a/arch/arm/cpu/armv7/exynos/clock.c +++ b/arch/arm/cpu/armv7/exynos/clock.c @@ -73,10 +73,8 @@ static int exynos_get_pll_clk(int pllreg, unsigned int r, unsigned int k) /* FOUT = (MDIV + K / 1024) * FIN / (PDIV * 2^SDIV) */ fout = (m + k / 1024) * (freq / (p * (1 << s))); } else { - if (s < 1) - s = 1; - /* FOUT = MDIV * FIN / (PDIV * 2^(SDIV - 1)) */ - fout = m * (freq / (p * (1 << (s - 1)))); + /* FOUT = MDIV * FIN / (PDIV * 2^SDIV) */ + fout = m * (freq / (p * (1 << s))); }
return fout;
On Fri, Mar 22, 2013 at 5:26 AM, Akshay Saraswat akshay.s@samsung.com wrote:
According to the latest exynos5 user manual, the equation for calculating PLL output was changed to FOUT= MDIV x FIN/(PDIV x 2^SDIV) earlier it was FOUT= MDIV x FIN/(PDIV x 2^(SDIV -1)) So updating the clock code accordingly.
Signed-off-by: Hatim Ali hatim.rv@samsung.com Signed-off-by: Akshay Saraswat akshay.s@samsung.com
Acked-by: Simon Glass sjg@chromium.org
I think this is EVT1 silicon, right?
arch/arm/cpu/armv7/exynos/clock.c | 6 ++---- 1 file changed, 2 insertions(+), 4 deletions(-)
diff --git a/arch/arm/cpu/armv7/exynos/clock.c b/arch/arm/cpu/armv7/exynos/clock.c index 956427c..5299bc7 100644 --- a/arch/arm/cpu/armv7/exynos/clock.c +++ b/arch/arm/cpu/armv7/exynos/clock.c @@ -73,10 +73,8 @@ static int exynos_get_pll_clk(int pllreg, unsigned int r, unsigned int k) /* FOUT = (MDIV + K / 1024) * FIN / (PDIV * 2^SDIV) */ fout = (m + k / 1024) * (freq / (p * (1 << s))); } else {
if (s < 1)s = 1;/* FOUT = MDIV * FIN / (PDIV * 2^(SDIV - 1)) */fout = m * (freq / (p * (1 << (s - 1))));
/* FOUT = MDIV * FIN / (PDIV * 2^SDIV) */fout = m * (freq / (p * (1 << s))); } return fout;-- 1.8.0
Dear Akshay Saraswat,
On 22/03/13 21:26, Akshay Saraswat wrote:
According to the latest exynos5 user manual, the equation for calculating PLL output was changed to FOUT= MDIV x FIN/(PDIV x 2^SDIV) earlier it was FOUT= MDIV x FIN/(PDIV x 2^(SDIV -1)) So updating the clock code accordingly.
Signed-off-by: Hatim Ali hatim.rv@samsung.com Signed-off-by: Akshay Saraswat akshay.s@samsung.com
arch/arm/cpu/armv7/exynos/clock.c | 6 ++---- 1 file changed, 2 insertions(+), 4 deletions(-)
diff --git a/arch/arm/cpu/armv7/exynos/clock.c b/arch/arm/cpu/armv7/exynos/clock.c index 956427c..5299bc7 100644 --- a/arch/arm/cpu/armv7/exynos/clock.c +++ b/arch/arm/cpu/armv7/exynos/clock.c @@ -73,10 +73,8 @@ static int exynos_get_pll_clk(int pllreg, unsigned int r, unsigned int k) /* FOUT = (MDIV + K / 1024) * FIN / (PDIV * 2^SDIV) */ fout = (m + k / 1024) * (freq / (p * (1 << s))); } else {
if (s < 1)s = 1;/* FOUT = MDIV * FIN / (PDIV * 2^(SDIV - 1)) */fout = m * (freq / (p * (1 << (s - 1))));
/* FOUT = MDIV * FIN / (PDIV * 2^SDIV) */fout = m * (freq / (p * (1 << s)));}
return fout;
applied to u-boot-samsung.
Thanks, Minkyu Kang.
participants (3)
-
Akshay Saraswat -
Minkyu Kang -
Simon Glass