RE: [PATCH 3/6] drm/exynos: exynos7_drm_decon: fix ideal_clk by converting it to Hz

["대인기/Tizen Platform Lab(SR)/삼성전자" <inki.dae@samsung.com>]

> -----Original Message-----
> From: Kaustabh Chakraborty <kauschluss@disroot.org>
> Sent: Friday, September 20, 2024 12:11 AM
> To: Inki Dae <inki.dae@samsung.com>; Seung-Woo Kim
> <sw0312.kim@samsung.com>; Kyungmin Park <kyungmin.park@samsung.com>; David
> Airlie <airlied@gmail.com>; Simona Vetter <simona@ffwll.ch>; Krzysztof
> Kozlowski <krzk@kernel.org>; Alim Akhtar <alim.akhtar@samsung.com>;
> Maarten Lankhorst <maarten.lankhorst@linux.intel.com>; Maxime Ripard
> <mripard@kernel.org>; Thomas Zimmermann <tzimmermann@suse.de>; Rob Herring
> <robh@kernel.org>; Conor Dooley <conor@kernel.org>
> Cc: dri-devel@lists.freedesktop.org; linux-arm-kernel@lists.infradead.org;
> linux-samsung-soc@vger.kernel.org; linux-kernel@vger.kernel.org;
> devicetree@vger.kernel.org; Kaustabh Chakraborty <kauschluss@disroot.org>
> Subject: [PATCH 3/6] drm/exynos: exynos7_drm_decon: fix ideal_clk by
> converting it to Hz
> 
> The clkdiv values are incorrect as ideal_clk is in kHz and the clock
> rate of vclk is in Hz. Multiply 1000 to ideal_clk to bring it to Hz.
> 
> Signed-off-by: Kaustabh Chakraborty <kauschluss@disroot.org>
> ---
>  drivers/gpu/drm/exynos/exynos7_drm_decon.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/gpu/drm/exynos/exynos7_drm_decon.c
> b/drivers/gpu/drm/exynos/exynos7_drm_decon.c
> index 2c4ee87ae6ec..4e4ced50ff15 100644
> --- a/drivers/gpu/drm/exynos/exynos7_drm_decon.c
> +++ b/drivers/gpu/drm/exynos/exynos7_drm_decon.c
> @@ -137,7 +137,7 @@ static void decon_ctx_remove(struct decon_context *ctx)
>  static u32 decon_calc_clkdiv(struct decon_context *ctx,
>  		const struct drm_display_mode *mode)
>  {
> -	unsigned long ideal_clk = mode->clock;
> +	unsigned long ideal_clk = mode->clock * 1000;

Right. ideal_clk should be fixed with Hz.

Thanks,
Inki Dae

>  	u32 clkdiv;
> 
>  	/* Find the clock divider value that gets us closest to ideal_clk
> */
> 
> --
> 2.46.1