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Subject[PATCH V1 5/7] mmc: sdhci-msm: Read and use DLL Config property from device tree file
Date
Certain platforms require different settings in the
SDCC_HC_REG_DLL_CONFIG register. This setting can change from platform
to platform. So the driver should check whether a particular platform
require a different setting by reading the DT file and use it.

Also use msm_cm_dll_set_freq only when DLL not supplied.

Signed-off-by: Bao D. Nguyen <nguyenb@codeaurora.org>
Signed-off-by: Sarthak Garg <sartgarg@codeaurora.org>
---
drivers/mmc/host/sdhci-msm.c | 13 +++++++++++--
1 file changed, 11 insertions(+), 2 deletions(-)

diff --git a/drivers/mmc/host/sdhci-msm.c b/drivers/mmc/host/sdhci-msm.c
index b879806..598880a 100644
--- a/drivers/mmc/host/sdhci-msm.c
+++ b/drivers/mmc/host/sdhci-msm.c
@@ -275,6 +275,7 @@ struct sdhci_msm_host {
u32 transfer_mode;
bool updated_ddr_cfg;
bool uses_tassadar_dll;
+ u32 dll_config;
u32 ddr_config;
};

@@ -617,6 +618,9 @@ static int msm_init_cm_dll(struct sdhci_host *host)
config &= ~CORE_CLK_PWRSAVE;
writel_relaxed(config, host->ioaddr + msm_offset->core_vendor_spec);

+ config = msm_host->dll_config;
+ writel_relaxed(config, host->ioaddr + msm_offset->core_dll_config);
+
if (msm_host->use_14lpp_dll_reset) {
config = readl_relaxed(host->ioaddr +
msm_offset->core_dll_config);
@@ -642,7 +646,9 @@ static int msm_init_cm_dll(struct sdhci_host *host)
config |= CORE_DLL_PDN;
writel_relaxed(config, host->ioaddr +
msm_offset->core_dll_config);
- msm_cm_dll_set_freq(host);
+
+ if (!msm_host->dll_config)
+ msm_cm_dll_set_freq(host);

if (msm_host->use_14lpp_dll_reset &&
!IS_ERR_OR_NULL(msm_host->xo_clk)) {
@@ -682,7 +688,8 @@ static int msm_init_cm_dll(struct sdhci_host *host)
msm_offset->core_dll_config);

if (msm_host->use_14lpp_dll_reset) {
- msm_cm_dll_set_freq(host);
+ if (!msm_host->dll_config)
+ msm_cm_dll_set_freq(host);
config = readl_relaxed(host->ioaddr +
msm_offset->core_dll_config_2);
config &= ~CORE_DLL_CLOCK_DISABLE;
@@ -1944,6 +1951,8 @@ static inline void sdhci_msm_get_of_property(struct platform_device *pdev,
if (of_property_read_u32(node, "qcom,ddr-config",
&msm_host->ddr_config))
msm_host->ddr_config = DDR_CONFIG_POR_VAL;
+
+ of_property_read_u32(node, "qcom,dll-config", &msm_host->dll_config);
}


--
2.7.4
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