| Message ID | 20220314111806.28168-1-tinghan.shen@mediatek.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | [v3] remoteproc: mediatek: fix side effect of mt8195 sram power on | expand |
Il 14/03/22 12:18, Tinghan Shen ha scritto: > 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. > > Signed-off-by: Tinghan Shen <tinghan.shen@mediatek.com> Hello Tinghan, I'm sorry, but in the last review I forgot to mention that you should really add a Fixes tag to this commit, since this is.. a fix. This is the tag that you should use: Fixes: 79111df414fc ("remoteproc: mediatek: Support mt8195 scp") After adding that, Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com> > --- > v3: fix build error > v2: apply comments about macro definition and function calls > --- > drivers/remoteproc/mtk_common.h | 2 + > drivers/remoteproc/mtk_scp.c | 67 +++++++++++++++++++++++++-------- > 2 files changed, 53 insertions(+), 16 deletions(-) >
On 14/03/2022 12:18, 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. > > Signed-off-by: Tinghan Shen <tinghan.shen@mediatek.com> Reviewed-by: Matthias Brugger <matthias.bgg@gmail.com> > --- > v3: fix build error > v2: apply comments about macro definition and function calls > --- > drivers/remoteproc/mtk_common.h | 2 + > drivers/remoteproc/mtk_scp.c | 67 +++++++++++++++++++++++++-------- > 2 files changed, 53 insertions(+), 16 deletions(-) > > diff --git a/drivers/remoteproc/mtk_common.h b/drivers/remoteproc/mtk_common.h > index 5ff3867c72f3..ff954a06637c 100644 > --- a/drivers/remoteproc/mtk_common.h > +++ b/drivers/remoteproc/mtk_common.h > @@ -51,6 +51,8 @@ > #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 dcddb33e9997..d498f6354cd0 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 mt8192_scp_before_load(struct mtk_scp *scp) > @@ -391,11 +391,32 @@ 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); > @@ -551,11 +572,25 @@ 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); > @@ -888,11 +923,11 @@ 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,
Hi Angelo, On Mon, 2022-03-14 at 12:31 +0100, AngeloGioacchino Del Regno wrote: > Il 14/03/22 12:18, Tinghan Shen ha scritto: > > 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. > > > > Signed-off-by: Tinghan Shen <tinghan.shen@mediatek.com> > > > Hello Tinghan, > > I'm sorry, but in the last review I forgot to mention that you should > really add a Fixes tag to this commit, since this is.. a fix. > > This is the tag that you should use: > > Fixes: 79111df414fc ("remoteproc: mediatek: Support mt8195 scp") > > After adding that, > Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com> > I'll add it at next version. thank you very much! Best regards, TingHan > > --- > > v3: fix build error > > v2: apply comments about macro definition and function calls > > --- > > drivers/remoteproc/mtk_common.h | 2 + > > drivers/remoteproc/mtk_scp.c | 67 +++++++++++++++++++++++++-------- > > 2 files changed, 53 insertions(+), 16 deletions(-) > >
diff --git a/drivers/remoteproc/mtk_common.h b/drivers/remoteproc/mtk_common.h index 5ff3867c72f3..ff954a06637c 100644 --- a/drivers/remoteproc/mtk_common.h +++ b/drivers/remoteproc/mtk_common.h @@ -51,6 +51,8 @@ #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 dcddb33e9997..d498f6354cd0 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 mt8192_scp_before_load(struct mtk_scp *scp) @@ -391,11 +391,32 @@ 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); @@ -551,11 +572,25 @@ 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); @@ -888,11 +923,11 @@ 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,
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. Signed-off-by: Tinghan Shen <tinghan.shen@mediatek.com> --- v3: fix build error v2: apply comments about macro definition and function calls --- drivers/remoteproc/mtk_common.h | 2 + drivers/remoteproc/mtk_scp.c | 67 +++++++++++++++++++++++++-------- 2 files changed, 53 insertions(+), 16 deletions(-)