diff mbox series

[v6] remoteproc: mediatek: Fix side effect of mt8195 sram power on

Message ID 20220321060340.10975-1-tinghan.shen@mediatek.com (mailing list archive)
State New, archived
Headers show
Series [v6] remoteproc: mediatek: Fix side effect of mt8195 sram power on | expand

Commit Message

Tinghan Shen March 21, 2022, 6:03 a.m. UTC 
The definition of L1TCM_SRAM_PDN bits on mt8195 is different to mt8192.

L1TCM_SRAM_PDN bits[3:0] control the power of mt8195 L1TCM SRAM.

L1TCM_SRAM_PDN bits[7:4] control the access path to EMI for SCP.
These bits have to be powered on to allow EMI access for SCP.

Bits[7:4] also affect audio DSP because audio DSP and SCP are
placed on the same hardware bus. If SCP cannot access EMI, audio DSP is
blocked too.

L1TCM_SRAM_PDN bits[31:8] are not used.

This fix removes modification of bits[7:4] when power on/off mt8195 SCP
L1TCM. It's because the modification introduces a short period of time
blocking audio DSP to access EMI. This was not a problem until we have
to load both SCP module and audio DSP module. audio DSP needs to access
EMI because it has source/data on DRAM. Audio DSP will have unexpected
behavior when it accesses EMI and the SCP driver blocks the EMI path at
the same time.

Fixes: 79111df414fc ("remoteproc: mediatek: Support mt8195 scp")
Signed-off-by: Tinghan Shen <tinghan.shen@mediatek.com>
Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Reviewed-by: Matthias Brugger <matthias.bgg@gmail.com>

---
v6: fix build error
v5: rebased on rproc-next
v4: add Fixes and Reviewed-by tags
v3: fix build error
v2: apply comments about macro definition and function calls
---
 drivers/remoteproc/mtk_common.h |  2 +
 drivers/remoteproc/mtk_scp.c    | 69 +++++++++++++++++++++++++--------
 2 files changed, 54 insertions(+), 17 deletions(-)

Comments

Mathieu Poirier April 11, 2022, 3:57 p.m. UTC | #1 
On Mon, Mar 21, 2022 at 02:03:40PM +0800, Tinghan Shen wrote:
> The definition of L1TCM_SRAM_PDN bits on mt8195 is different to mt8192.
> 
> L1TCM_SRAM_PDN bits[3:0] control the power of mt8195 L1TCM SRAM.
> 
> L1TCM_SRAM_PDN bits[7:4] control the access path to EMI for SCP.
> These bits have to be powered on to allow EMI access for SCP.
> 
> Bits[7:4] also affect audio DSP because audio DSP and SCP are
> placed on the same hardware bus. If SCP cannot access EMI, audio DSP is
> blocked too.
> 
> L1TCM_SRAM_PDN bits[31:8] are not used.
> 
> This fix removes modification of bits[7:4] when power on/off mt8195 SCP
> L1TCM. It's because the modification introduces a short period of time
> blocking audio DSP to access EMI. This was not a problem until we have
> to load both SCP module and audio DSP module. audio DSP needs to access
> EMI because it has source/data on DRAM. Audio DSP will have unexpected
> behavior when it accesses EMI and the SCP driver blocks the EMI path at
> the same time.
> 
> Fixes: 79111df414fc ("remoteproc: mediatek: Support mt8195 scp")
> Signed-off-by: Tinghan Shen <tinghan.shen@mediatek.com>
> Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
> Reviewed-by: Matthias Brugger <matthias.bgg@gmail.com>
> 
> ---
> v6: fix build error
> v5: rebased on rproc-next
> v4: add Fixes and Reviewed-by tags
> v3: fix build error
> v2: apply comments about macro definition and function calls
> ---
>  drivers/remoteproc/mtk_common.h |  2 +
>  drivers/remoteproc/mtk_scp.c    | 69 +++++++++++++++++++++++++--------
>  2 files changed, 54 insertions(+), 17 deletions(-)
>

Applied.

Thanks,
Mathieu

> diff --git a/drivers/remoteproc/mtk_common.h b/drivers/remoteproc/mtk_common.h
> index 71ce4977cb0b..ea6fa1100a00 100644
> --- a/drivers/remoteproc/mtk_common.h
> +++ b/drivers/remoteproc/mtk_common.h
> @@ -54,6 +54,8 @@
>  #define MT8192_CORE0_WDT_IRQ		0x10030
>  #define MT8192_CORE0_WDT_CFG		0x10034
>  
> +#define MT8195_L1TCM_SRAM_PDN_RESERVED_RSI_BITS		GENMASK(7, 4)
> +
>  #define SCP_FW_VER_LEN			32
>  #define SCP_SHARE_BUFFER_SIZE		288
>  
> diff --git a/drivers/remoteproc/mtk_scp.c b/drivers/remoteproc/mtk_scp.c
> index 38609153bf64..ee6c4009586e 100644
> --- a/drivers/remoteproc/mtk_scp.c
> +++ b/drivers/remoteproc/mtk_scp.c
> @@ -365,22 +365,22 @@ static int mt8183_scp_before_load(struct mtk_scp *scp)
>  	return 0;
>  }
>  
> -static void mt8192_power_on_sram(void __iomem *addr)
> +static void scp_sram_power_on(void __iomem *addr, u32 reserved_mask)
>  {
>  	int i;
>  
>  	for (i = 31; i >= 0; i--)
> -		writel(GENMASK(i, 0), addr);
> +		writel(GENMASK(i, 0) & ~reserved_mask, addr);
>  	writel(0, addr);
>  }
>  
> -static void mt8192_power_off_sram(void __iomem *addr)
> +static void scp_sram_power_off(void __iomem *addr, u32 reserved_mask)
>  {
>  	int i;
>  
>  	writel(0, addr);
>  	for (i = 0; i < 32; i++)
> -		writel(GENMASK(i, 0), addr);
> +		writel(GENMASK(i, 0) & ~reserved_mask, addr);
>  }
>  
>  static int mt8186_scp_before_load(struct mtk_scp *scp)
> @@ -393,7 +393,7 @@ static int mt8186_scp_before_load(struct mtk_scp *scp)
>  	writel(0x0, scp->reg_base + MT8183_SCP_CLK_DIV_SEL);
>  
>  	/* Turn on the power of SCP's SRAM before using it. Enable 1 block per time*/
> -	mt8192_power_on_sram(scp->reg_base + MT8183_SCP_SRAM_PDN);
> +	scp_sram_power_on(scp->reg_base + MT8183_SCP_SRAM_PDN, 0);
>  
>  	/* Initialize TCM before loading FW. */
>  	writel(0x0, scp->reg_base + MT8183_SCP_L1_SRAM_PD);
> @@ -412,11 +412,32 @@ static int mt8192_scp_before_load(struct mtk_scp *scp)
>  	writel(1, scp->reg_base + MT8192_CORE0_SW_RSTN_SET);
>  
>  	/* enable SRAM clock */
> -	mt8192_power_on_sram(scp->reg_base + MT8192_L2TCM_SRAM_PD_0);
> -	mt8192_power_on_sram(scp->reg_base + MT8192_L2TCM_SRAM_PD_1);
> -	mt8192_power_on_sram(scp->reg_base + MT8192_L2TCM_SRAM_PD_2);
> -	mt8192_power_on_sram(scp->reg_base + MT8192_L1TCM_SRAM_PDN);
> -	mt8192_power_on_sram(scp->reg_base + MT8192_CPU0_SRAM_PD);
> +	scp_sram_power_on(scp->reg_base + MT8192_L2TCM_SRAM_PD_0, 0);
> +	scp_sram_power_on(scp->reg_base + MT8192_L2TCM_SRAM_PD_1, 0);
> +	scp_sram_power_on(scp->reg_base + MT8192_L2TCM_SRAM_PD_2, 0);
> +	scp_sram_power_on(scp->reg_base + MT8192_L1TCM_SRAM_PDN, 0);
> +	scp_sram_power_on(scp->reg_base + MT8192_CPU0_SRAM_PD, 0);
> +
> +	/* enable MPU for all memory regions */
> +	writel(0xff, scp->reg_base + MT8192_CORE0_MEM_ATT_PREDEF);
> +
> +	return 0;
> +}
> +
> +static int mt8195_scp_before_load(struct mtk_scp *scp)
> +{
> +	/* clear SPM interrupt, SCP2SPM_IPC_CLR */
> +	writel(0xff, scp->reg_base + MT8192_SCP2SPM_IPC_CLR);
> +
> +	writel(1, scp->reg_base + MT8192_CORE0_SW_RSTN_SET);
> +
> +	/* enable SRAM clock */
> +	scp_sram_power_on(scp->reg_base + MT8192_L2TCM_SRAM_PD_0, 0);
> +	scp_sram_power_on(scp->reg_base + MT8192_L2TCM_SRAM_PD_1, 0);
> +	scp_sram_power_on(scp->reg_base + MT8192_L2TCM_SRAM_PD_2, 0);
> +	scp_sram_power_on(scp->reg_base + MT8192_L1TCM_SRAM_PDN,
> +			  MT8195_L1TCM_SRAM_PDN_RESERVED_RSI_BITS);
> +	scp_sram_power_on(scp->reg_base + MT8192_CPU0_SRAM_PD, 0);
>  
>  	/* enable MPU for all memory regions */
>  	writel(0xff, scp->reg_base + MT8192_CORE0_MEM_ATT_PREDEF);
> @@ -572,11 +593,25 @@ static void mt8183_scp_stop(struct mtk_scp *scp)
>  static void mt8192_scp_stop(struct mtk_scp *scp)
>  {
>  	/* Disable SRAM clock */
> -	mt8192_power_off_sram(scp->reg_base + MT8192_L2TCM_SRAM_PD_0);
> -	mt8192_power_off_sram(scp->reg_base + MT8192_L2TCM_SRAM_PD_1);
> -	mt8192_power_off_sram(scp->reg_base + MT8192_L2TCM_SRAM_PD_2);
> -	mt8192_power_off_sram(scp->reg_base + MT8192_L1TCM_SRAM_PDN);
> -	mt8192_power_off_sram(scp->reg_base + MT8192_CPU0_SRAM_PD);
> +	scp_sram_power_off(scp->reg_base + MT8192_L2TCM_SRAM_PD_0, 0);
> +	scp_sram_power_off(scp->reg_base + MT8192_L2TCM_SRAM_PD_1, 0);
> +	scp_sram_power_off(scp->reg_base + MT8192_L2TCM_SRAM_PD_2, 0);
> +	scp_sram_power_off(scp->reg_base + MT8192_L1TCM_SRAM_PDN, 0);
> +	scp_sram_power_off(scp->reg_base + MT8192_CPU0_SRAM_PD, 0);
> +
> +	/* Disable SCP watchdog */
> +	writel(0, scp->reg_base + MT8192_CORE0_WDT_CFG);
> +}
> +
> +static void mt8195_scp_stop(struct mtk_scp *scp)
> +{
> +	/* Disable SRAM clock */
> +	scp_sram_power_off(scp->reg_base + MT8192_L2TCM_SRAM_PD_0, 0);
> +	scp_sram_power_off(scp->reg_base + MT8192_L2TCM_SRAM_PD_1, 0);
> +	scp_sram_power_off(scp->reg_base + MT8192_L2TCM_SRAM_PD_2, 0);
> +	scp_sram_power_off(scp->reg_base + MT8192_L1TCM_SRAM_PDN,
> +			   MT8195_L1TCM_SRAM_PDN_RESERVED_RSI_BITS);
> +	scp_sram_power_off(scp->reg_base + MT8192_CPU0_SRAM_PD, 0);
>  
>  	/* Disable SCP watchdog */
>  	writel(0, scp->reg_base + MT8192_CORE0_WDT_CFG);
> @@ -922,11 +957,11 @@ static const struct mtk_scp_of_data mt8192_of_data = {
>  
>  static const struct mtk_scp_of_data mt8195_of_data = {
>  	.scp_clk_get = mt8195_scp_clk_get,
> -	.scp_before_load = mt8192_scp_before_load,
> +	.scp_before_load = mt8195_scp_before_load,
>  	.scp_irq_handler = mt8192_scp_irq_handler,
>  	.scp_reset_assert = mt8192_scp_reset_assert,
>  	.scp_reset_deassert = mt8192_scp_reset_deassert,
> -	.scp_stop = mt8192_scp_stop,
> +	.scp_stop = mt8195_scp_stop,
>  	.scp_da_to_va = mt8192_scp_da_to_va,
>  	.host_to_scp_reg = MT8192_GIPC_IN_SET,
>  	.host_to_scp_int_bit = MT8192_HOST_IPC_INT_BIT,
> -- 
> 2.18.0
>
diff mbox series

Patch

diff --git a/drivers/remoteproc/mtk_common.h b/drivers/remoteproc/mtk_common.h
index 71ce4977cb0b..ea6fa1100a00 100644
--- a/drivers/remoteproc/mtk_common.h
+++ b/drivers/remoteproc/mtk_common.h
@@ -54,6 +54,8 @@ 
 #define MT8192_CORE0_WDT_IRQ		0x10030
 #define MT8192_CORE0_WDT_CFG		0x10034
 
+#define MT8195_L1TCM_SRAM_PDN_RESERVED_RSI_BITS		GENMASK(7, 4)
+
 #define SCP_FW_VER_LEN			32
 #define SCP_SHARE_BUFFER_SIZE		288
 
diff --git a/drivers/remoteproc/mtk_scp.c b/drivers/remoteproc/mtk_scp.c
index 38609153bf64..ee6c4009586e 100644
--- a/drivers/remoteproc/mtk_scp.c
+++ b/drivers/remoteproc/mtk_scp.c
@@ -365,22 +365,22 @@  static int mt8183_scp_before_load(struct mtk_scp *scp)
 	return 0;
 }
 
-static void mt8192_power_on_sram(void __iomem *addr)
+static void scp_sram_power_on(void __iomem *addr, u32 reserved_mask)
 {
 	int i;
 
 	for (i = 31; i >= 0; i--)
-		writel(GENMASK(i, 0), addr);
+		writel(GENMASK(i, 0) & ~reserved_mask, addr);
 	writel(0, addr);
 }
 
-static void mt8192_power_off_sram(void __iomem *addr)
+static void scp_sram_power_off(void __iomem *addr, u32 reserved_mask)
 {
 	int i;
 
 	writel(0, addr);
 	for (i = 0; i < 32; i++)
-		writel(GENMASK(i, 0), addr);
+		writel(GENMASK(i, 0) & ~reserved_mask, addr);
 }
 
 static int mt8186_scp_before_load(struct mtk_scp *scp)
@@ -393,7 +393,7 @@  static int mt8186_scp_before_load(struct mtk_scp *scp)
 	writel(0x0, scp->reg_base + MT8183_SCP_CLK_DIV_SEL);
 
 	/* Turn on the power of SCP's SRAM before using it. Enable 1 block per time*/
-	mt8192_power_on_sram(scp->reg_base + MT8183_SCP_SRAM_PDN);
+	scp_sram_power_on(scp->reg_base + MT8183_SCP_SRAM_PDN, 0);
 
 	/* Initialize TCM before loading FW. */
 	writel(0x0, scp->reg_base + MT8183_SCP_L1_SRAM_PD);
@@ -412,11 +412,32 @@  static int mt8192_scp_before_load(struct mtk_scp *scp)
 	writel(1, scp->reg_base + MT8192_CORE0_SW_RSTN_SET);
 
 	/* enable SRAM clock */
-	mt8192_power_on_sram(scp->reg_base + MT8192_L2TCM_SRAM_PD_0);
-	mt8192_power_on_sram(scp->reg_base + MT8192_L2TCM_SRAM_PD_1);
-	mt8192_power_on_sram(scp->reg_base + MT8192_L2TCM_SRAM_PD_2);
-	mt8192_power_on_sram(scp->reg_base + MT8192_L1TCM_SRAM_PDN);
-	mt8192_power_on_sram(scp->reg_base + MT8192_CPU0_SRAM_PD);
+	scp_sram_power_on(scp->reg_base + MT8192_L2TCM_SRAM_PD_0, 0);
+	scp_sram_power_on(scp->reg_base + MT8192_L2TCM_SRAM_PD_1, 0);
+	scp_sram_power_on(scp->reg_base + MT8192_L2TCM_SRAM_PD_2, 0);
+	scp_sram_power_on(scp->reg_base + MT8192_L1TCM_SRAM_PDN, 0);
+	scp_sram_power_on(scp->reg_base + MT8192_CPU0_SRAM_PD, 0);
+
+	/* enable MPU for all memory regions */
+	writel(0xff, scp->reg_base + MT8192_CORE0_MEM_ATT_PREDEF);
+
+	return 0;
+}
+
+static int mt8195_scp_before_load(struct mtk_scp *scp)
+{
+	/* clear SPM interrupt, SCP2SPM_IPC_CLR */
+	writel(0xff, scp->reg_base + MT8192_SCP2SPM_IPC_CLR);
+
+	writel(1, scp->reg_base + MT8192_CORE0_SW_RSTN_SET);
+
+	/* enable SRAM clock */
+	scp_sram_power_on(scp->reg_base + MT8192_L2TCM_SRAM_PD_0, 0);
+	scp_sram_power_on(scp->reg_base + MT8192_L2TCM_SRAM_PD_1, 0);
+	scp_sram_power_on(scp->reg_base + MT8192_L2TCM_SRAM_PD_2, 0);
+	scp_sram_power_on(scp->reg_base + MT8192_L1TCM_SRAM_PDN,
+			  MT8195_L1TCM_SRAM_PDN_RESERVED_RSI_BITS);
+	scp_sram_power_on(scp->reg_base + MT8192_CPU0_SRAM_PD, 0);
 
 	/* enable MPU for all memory regions */
 	writel(0xff, scp->reg_base + MT8192_CORE0_MEM_ATT_PREDEF);
@@ -572,11 +593,25 @@  static void mt8183_scp_stop(struct mtk_scp *scp)
 static void mt8192_scp_stop(struct mtk_scp *scp)
 {
 	/* Disable SRAM clock */
-	mt8192_power_off_sram(scp->reg_base + MT8192_L2TCM_SRAM_PD_0);
-	mt8192_power_off_sram(scp->reg_base + MT8192_L2TCM_SRAM_PD_1);
-	mt8192_power_off_sram(scp->reg_base + MT8192_L2TCM_SRAM_PD_2);
-	mt8192_power_off_sram(scp->reg_base + MT8192_L1TCM_SRAM_PDN);
-	mt8192_power_off_sram(scp->reg_base + MT8192_CPU0_SRAM_PD);
+	scp_sram_power_off(scp->reg_base + MT8192_L2TCM_SRAM_PD_0, 0);
+	scp_sram_power_off(scp->reg_base + MT8192_L2TCM_SRAM_PD_1, 0);
+	scp_sram_power_off(scp->reg_base + MT8192_L2TCM_SRAM_PD_2, 0);
+	scp_sram_power_off(scp->reg_base + MT8192_L1TCM_SRAM_PDN, 0);
+	scp_sram_power_off(scp->reg_base + MT8192_CPU0_SRAM_PD, 0);
+
+	/* Disable SCP watchdog */
+	writel(0, scp->reg_base + MT8192_CORE0_WDT_CFG);
+}
+
+static void mt8195_scp_stop(struct mtk_scp *scp)
+{
+	/* Disable SRAM clock */
+	scp_sram_power_off(scp->reg_base + MT8192_L2TCM_SRAM_PD_0, 0);
+	scp_sram_power_off(scp->reg_base + MT8192_L2TCM_SRAM_PD_1, 0);
+	scp_sram_power_off(scp->reg_base + MT8192_L2TCM_SRAM_PD_2, 0);
+	scp_sram_power_off(scp->reg_base + MT8192_L1TCM_SRAM_PDN,
+			   MT8195_L1TCM_SRAM_PDN_RESERVED_RSI_BITS);
+	scp_sram_power_off(scp->reg_base + MT8192_CPU0_SRAM_PD, 0);
 
 	/* Disable SCP watchdog */
 	writel(0, scp->reg_base + MT8192_CORE0_WDT_CFG);
@@ -922,11 +957,11 @@  static const struct mtk_scp_of_data mt8192_of_data = {
 
 static const struct mtk_scp_of_data mt8195_of_data = {
 	.scp_clk_get = mt8195_scp_clk_get,
-	.scp_before_load = mt8192_scp_before_load,
+	.scp_before_load = mt8195_scp_before_load,
 	.scp_irq_handler = mt8192_scp_irq_handler,
 	.scp_reset_assert = mt8192_scp_reset_assert,
 	.scp_reset_deassert = mt8192_scp_reset_deassert,
-	.scp_stop = mt8192_scp_stop,
+	.scp_stop = mt8195_scp_stop,
 	.scp_da_to_va = mt8192_scp_da_to_va,
 	.host_to_scp_reg = MT8192_GIPC_IN_SET,
 	.host_to_scp_int_bit = MT8192_HOST_IPC_INT_BIT,