Re: [PATCH v3 3/3] clocksource/drivers/exynos_mct: increase the size of name array

Re: [PATCH v3 3/3] clocksource/drivers/exynos_mct: increase the size of name array

[Krzysztof Kozlowski]

On 21/02/2022 18:45, Alim Akhtar wrote:
> Variable _name_ hold mct_tick number per cpu and it is currently
> limited to 10. Which restrict the scalability of the MCT driver for
> the SoC which has more local timers interrupts (>= 12).
> Increase the length of it to make mct_tick printed correctly for
> each local timer interrupts per CPU.
> 
> Signed-off-by: Alim Akhtar <alim.akhtar@samsung.com>
> ---
>  drivers/clocksource/exynos_mct.c | 6 +++++-
>  1 file changed, 5 insertions(+), 1 deletion(-)
> 


Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com>


Best regards,
Krzysztof

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[PATCH v3 1/3] clocksource/drivers/exynos_mct: Remove mct interrupt index enum

[Alim Akhtar]

MCT driver define an enum which list global and local timer's
irq index. Most of them are not used but MCT_G0_IRQ and
MCT_L0_IRQ and these two are at a fixed offset/index.
Get rid of this enum and use a #define for the used irq index.

No functional changes expected.

Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com>
Signed-off-by: Alim Akhtar <alim.akhtar@samsung.com>
---
 drivers/clocksource/exynos_mct.c | 22 ++++++----------------
 1 file changed, 6 insertions(+), 16 deletions(-)

diff --git a/drivers/clocksource/exynos_mct.c b/drivers/clocksource/exynos_mct.c
index 6db3d5511b0f..b3f3d27a837b 100644
--- a/drivers/clocksource/exynos_mct.c
+++ b/drivers/clocksource/exynos_mct.c
@@ -60,27 +60,17 @@
 #define MCT_CLKEVENTS_RATING		350
 #endif
 
+/* There are four Global timers starting with 0 offset */
+#define MCT_G0_IRQ	0
+/* Local timers count starts after global timer count */
+#define MCT_L0_IRQ	4
+#define MCT_NR_IRQS	12
+
 enum {
 	MCT_INT_SPI,
 	MCT_INT_PPI
 };
 
-enum {
-	MCT_G0_IRQ,
-	MCT_G1_IRQ,
-	MCT_G2_IRQ,
-	MCT_G3_IRQ,
-	MCT_L0_IRQ,
-	MCT_L1_IRQ,
-	MCT_L2_IRQ,
-	MCT_L3_IRQ,
-	MCT_L4_IRQ,
-	MCT_L5_IRQ,
-	MCT_L6_IRQ,
-	MCT_L7_IRQ,
-	MCT_NR_IRQS,
-};
-
 static void __iomem *reg_base;
 static unsigned long clk_rate;
 static unsigned int mct_int_type;
-- 
2.25.1


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[PATCH v3 2/3] clocksource/drivers/exynos_mct: bump up mct max irq number

[Alim Akhtar]

Bump-up maximum number of MCT IRQ to match the binding
documentation. This make driver scalable for SoC which
has more than 12 timer irqs, like recently added FSD SoC.

Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com>
Signed-off-by: Alim Akhtar <alim.akhtar@samsung.com>
---
 drivers/clocksource/exynos_mct.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/clocksource/exynos_mct.c b/drivers/clocksource/exynos_mct.c
index b3f3d27a837b..0c7931f7f99a 100644
--- a/drivers/clocksource/exynos_mct.c
+++ b/drivers/clocksource/exynos_mct.c
@@ -64,7 +64,8 @@
 #define MCT_G0_IRQ	0
 /* Local timers count starts after global timer count */
 #define MCT_L0_IRQ	4
-#define MCT_NR_IRQS	12
+/* Max number of IRQ as per DT binding document */
+#define MCT_NR_IRQS	20
 
 enum {
 	MCT_INT_SPI,
-- 
2.25.1


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[PATCH v3 3/3] clocksource/drivers/exynos_mct: increase the size of name array

[Alim Akhtar]

Variable _name_ hold mct_tick number per cpu and it is currently
limited to 10. Which restrict the scalability of the MCT driver for
the SoC which has more local timers interrupts (>= 12).
Increase the length of it to make mct_tick printed correctly for
each local timer interrupts per CPU.

Signed-off-by: Alim Akhtar <alim.akhtar@samsung.com>
---
 drivers/clocksource/exynos_mct.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/drivers/clocksource/exynos_mct.c b/drivers/clocksource/exynos_mct.c
index 0c7931f7f99a..b6de352b703d 100644
--- a/drivers/clocksource/exynos_mct.c
+++ b/drivers/clocksource/exynos_mct.c
@@ -80,7 +80,11 @@ static int mct_irqs[MCT_NR_IRQS];
 struct mct_clock_event_device {
 	struct clock_event_device evt;
 	unsigned long base;
-	char name[10];
+	/**
+	 *  The length of the name must be adjusted if number of
+	 *  local timer interrupts grow over two digits
+	 */
+	char name[11];
 };
 
 static void exynos4_mct_write(unsigned int value, unsigned long offset)
-- 
2.25.1


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