Re: [PATCH] media: qcom: camss: Fix overflows in clock rate calculations

From: Hans Verkuil
Date: Thu Mar 04 2021 - 05:32:25 EST

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On 10/02/2021 13:29, Vladimir Lypak 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.

This patch conflicts with Andrey's patch:

https://patchwork.linuxtv.org/project/linux-media/patch/20210217221134.2606-4-andrey.konovalov@xxxxxxxxxx/

I've picked up Andrey's patch in a pull request (not yet merged in our media master tree),
but you should rebase your patch on top of his if it is still needed.

Regards,

Hans

>
> Signed-off-by: Vladimir Lypak <junak.pub@xxxxxxxxx>
> ---
> 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);
>

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