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From:   Robert Foss <robert.foss@linaro.org>
Date:   Wed, 10 Feb 2021 15:23:45 +0100
Message-ID: <CAG3jFyvTGE8NtkjjNaXNeVueTYCUPStwp=mADVVbkgeDaQ_8zw@mail.gmail.com>
Subject: Re: [PATCH] media: qcom: camss: Fix overflows in clock rate calculations
To:     Vladimir Lypak <junak.pub@gmail.com>
Cc:     Todor Tomov <todor.too@gmail.com>, Andy Gross <agross@kernel.org>,
        Bjorn Andersson <bjorn.andersson@linaro.org>,
        Mauro Carvalho Chehab <mchehab@kernel.org>,
        linux-media <linux-media@vger.kernel.org>,
        MSM <linux-arm-msm@vger.kernel.org>,
        linux-kernel <linux-kernel@vger.kernel.org>
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Hey Vladimir,

This patch looks good to me, thanks for the submission.
Acked-by: Robert Foss <robert.foss@linaro.org>

On Wed, 10 Feb 2021 at 13:51, Vladimir Lypak <junak.pub@gmail.com> wrote:
>
> Because of u32 type being used to store pixel clock rate, expression used
> to calculate pipeline clocks (pixel_clock * bpp) produces wrong value due
> to integer overflow. This patch changes data type used to store, pass and
> retrieve pixel_clock from u32 to u64 to make this mistake less likely to
> be repeated in the future.
>
> Signed-off-by: Vladimir Lypak <junak.pub@gmail.com>
> ---
>  drivers/media/platform/qcom/camss/camss-csid.c           | 2 +-
>  drivers/media/platform/qcom/camss/camss-csiphy-2ph-1-0.c | 4 ++--
>  drivers/media/platform/qcom/camss/camss-csiphy-3ph-1-0.c | 4 ++--
>  drivers/media/platform/qcom/camss/camss-csiphy.c         | 4 ++--
>  drivers/media/platform/qcom/camss/camss-csiphy.h         | 2 +-
>  drivers/media/platform/qcom/camss/camss-vfe.c            | 4 ++--
>  drivers/media/platform/qcom/camss/camss.c                | 2 +-
>  drivers/media/platform/qcom/camss/camss.h                | 2 +-
>  8 files changed, 12 insertions(+), 12 deletions(-)
>
> diff --git a/drivers/media/platform/qcom/camss/camss-csid.c b/drivers/media/platform/qcom/camss/camss-csid.c
> index be3fe76f3dc30..6307b889baa69 100644
> --- a/drivers/media/platform/qcom/camss/camss-csid.c
> +++ b/drivers/media/platform/qcom/camss/camss-csid.c
> @@ -462,7 +462,7 @@ static irqreturn_t csid_isr(int irq, void *dev)
>  static int csid_set_clock_rates(struct csid_device *csid)
>  {
>         struct device *dev = csid->camss->dev;
> -       u32 pixel_clock;
> +       u64 pixel_clock;
>         int i, j;
>         int ret;
>
> diff --git a/drivers/media/platform/qcom/camss/camss-csiphy-2ph-1-0.c b/drivers/media/platform/qcom/camss/camss-csiphy-2ph-1-0.c
> index 12bce391d71fd..ec66d1557b8b1 100644
> --- a/drivers/media/platform/qcom/camss/camss-csiphy-2ph-1-0.c
> +++ b/drivers/media/platform/qcom/camss/camss-csiphy-2ph-1-0.c
> @@ -57,7 +57,7 @@ static void csiphy_reset(struct csiphy_device *csiphy)
>   * Return settle count value or 0 if the CSI2 pixel clock
>   * frequency is not available
>   */
> -static u8 csiphy_settle_cnt_calc(u32 pixel_clock, u8 bpp, u8 num_lanes,
> +static u8 csiphy_settle_cnt_calc(u64 pixel_clock, u8 bpp, u8 num_lanes,
>                                  u32 timer_clk_rate)
>  {
>         u32 mipi_clock; /* Hz */
> @@ -83,7 +83,7 @@ static u8 csiphy_settle_cnt_calc(u32 pixel_clock, u8 bpp, u8 num_lanes,
>
>  static void csiphy_lanes_enable(struct csiphy_device *csiphy,
>                                 struct csiphy_config *cfg,
> -                               u32 pixel_clock, u8 bpp, u8 lane_mask)
> +                               u64 pixel_clock, u8 bpp, u8 lane_mask)
>  {
>         struct csiphy_lanes_cfg *c = &cfg->csi2->lane_cfg;
>         u8 settle_cnt;
> diff --git a/drivers/media/platform/qcom/camss/camss-csiphy-3ph-1-0.c b/drivers/media/platform/qcom/camss/camss-csiphy-3ph-1-0.c
> index 97cb9de850315..cd6eb88a7c153 100644
> --- a/drivers/media/platform/qcom/camss/camss-csiphy-3ph-1-0.c
> +++ b/drivers/media/platform/qcom/camss/camss-csiphy-3ph-1-0.c
> @@ -113,7 +113,7 @@ static irqreturn_t csiphy_isr(int irq, void *dev)
>   * Return settle count value or 0 if the CSI2 pixel clock
>   * frequency is not available
>   */
> -static u8 csiphy_settle_cnt_calc(u32 pixel_clock, u8 bpp, u8 num_lanes,
> +static u8 csiphy_settle_cnt_calc(u64 pixel_clock, u8 bpp, u8 num_lanes,
>                                  u32 timer_clk_rate)
>  {
>         u32 mipi_clock; /* Hz */
> @@ -137,7 +137,7 @@ static u8 csiphy_settle_cnt_calc(u32 pixel_clock, u8 bpp, u8 num_lanes,
>
>  static void csiphy_lanes_enable(struct csiphy_device *csiphy,
>                                 struct csiphy_config *cfg,
> -                               u32 pixel_clock, u8 bpp, u8 lane_mask)
> +                               u64 pixel_clock, u8 bpp, u8 lane_mask)
>  {
>         struct csiphy_lanes_cfg *c = &cfg->csi2->lane_cfg;
>         u8 settle_cnt;
> diff --git a/drivers/media/platform/qcom/camss/camss-csiphy.c b/drivers/media/platform/qcom/camss/camss-csiphy.c
> index 509c9a59c09cd..61628f55c4f63 100644
> --- a/drivers/media/platform/qcom/camss/camss-csiphy.c
> +++ b/drivers/media/platform/qcom/camss/camss-csiphy.c
> @@ -102,7 +102,7 @@ static u8 csiphy_get_bpp(const struct csiphy_format *formats,
>  static int csiphy_set_clock_rates(struct csiphy_device *csiphy)
>  {
>         struct device *dev = csiphy->camss->dev;
> -       u32 pixel_clock;
> +       u64 pixel_clock;
>         int i, j;
>         int ret;
>
> @@ -238,7 +238,7 @@ static u8 csiphy_get_lane_mask(struct csiphy_lanes_cfg *lane_cfg)
>  static int csiphy_stream_on(struct csiphy_device *csiphy)
>  {
>         struct csiphy_config *cfg = &csiphy->cfg;
> -       u32 pixel_clock;
> +       u64 pixel_clock;
>         u8 lane_mask = csiphy_get_lane_mask(&cfg->csi2->lane_cfg);
>         u8 bpp = csiphy_get_bpp(csiphy->formats, csiphy->nformats,
>                                 csiphy->fmt[MSM_CSIPHY_PAD_SINK].code);
> diff --git a/drivers/media/platform/qcom/camss/camss-csiphy.h b/drivers/media/platform/qcom/camss/camss-csiphy.h
> index f7967ef836dcc..450c8247bd533 100644
> --- a/drivers/media/platform/qcom/camss/camss-csiphy.h
> +++ b/drivers/media/platform/qcom/camss/camss-csiphy.h
> @@ -50,7 +50,7 @@ struct csiphy_hw_ops {
>         void (*reset)(struct csiphy_device *csiphy);
>         void (*lanes_enable)(struct csiphy_device *csiphy,
>                              struct csiphy_config *cfg,
> -                            u32 pixel_clock, u8 bpp, u8 lane_mask);
> +                            u64 pixel_clock, u8 bpp, u8 lane_mask);
>         void (*lanes_disable)(struct csiphy_device *csiphy,
>                               struct csiphy_config *cfg);
>         irqreturn_t (*isr)(int irq, void *dev);
> diff --git a/drivers/media/platform/qcom/camss/camss-vfe.c b/drivers/media/platform/qcom/camss/camss-vfe.c
> index fae2b513b2f9d..b2c95b46ce661 100644
> --- a/drivers/media/platform/qcom/camss/camss-vfe.c
> +++ b/drivers/media/platform/qcom/camss/camss-vfe.c
> @@ -1112,7 +1112,7 @@ static inline void vfe_isr_halt_ack(struct vfe_device *vfe)
>  static int vfe_set_clock_rates(struct vfe_device *vfe)
>  {
>         struct device *dev = vfe->camss->dev;
> -       u32 pixel_clock[MSM_VFE_LINE_NUM];
> +       u64 pixel_clock[MSM_VFE_LINE_NUM];
>         int i, j;
>         int ret;
>
> @@ -1194,7 +1194,7 @@ static int vfe_set_clock_rates(struct vfe_device *vfe)
>   */
>  static int vfe_check_clock_rates(struct vfe_device *vfe)
>  {
> -       u32 pixel_clock[MSM_VFE_LINE_NUM];
> +       u64 pixel_clock[MSM_VFE_LINE_NUM];
>         int i, j;
>         int ret;
>
> diff --git a/drivers/media/platform/qcom/camss/camss.c b/drivers/media/platform/qcom/camss/camss.c
> index 8fefce57bc49f..eb55cf436b717 100644
> --- a/drivers/media/platform/qcom/camss/camss.c
> +++ b/drivers/media/platform/qcom/camss/camss.c
> @@ -555,7 +555,7 @@ struct media_entity *camss_find_sensor(struct media_entity *entity)
>   *
>   * Return 0 on success or a negative error code otherwise
>   */
> -int camss_get_pixel_clock(struct media_entity *entity, u32 *pixel_clock)
> +int camss_get_pixel_clock(struct media_entity *entity, u64 *pixel_clock)
>  {
>         struct media_entity *sensor;
>         struct v4l2_subdev *subdev;
> diff --git a/drivers/media/platform/qcom/camss/camss.h b/drivers/media/platform/qcom/camss/camss.h
> index 3a0484683cd6e..fabfce9a3496c 100644
> --- a/drivers/media/platform/qcom/camss/camss.h
> +++ b/drivers/media/platform/qcom/camss/camss.h
> @@ -108,7 +108,7 @@ int camss_enable_clocks(int nclocks, struct camss_clock *clock,
>                         struct device *dev);
>  void camss_disable_clocks(int nclocks, struct camss_clock *clock);
>  struct media_entity *camss_find_sensor(struct media_entity *entity);
> -int camss_get_pixel_clock(struct media_entity *entity, u32 *pixel_clock);
> +int camss_get_pixel_clock(struct media_entity *entity, u64 *pixel_clock);
>  int camss_pm_domain_on(struct camss *camss, int id);
>  void camss_pm_domain_off(struct camss *camss, int id);
>  void camss_delete(struct camss *camss);
> --
> 2.30.0
>